Xiaosi Zhou

Nanjing Normal University, Nan-ching, Jiangsu Sheng, China

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Publications (34)208.5 Total impact

  • Xia Liu · Yichen Du · Xin Xu · Xiaosi Zhou · Zhihui Dai · Jianchun Bao
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    ABSTRACT: Antimony is a promising high-capacity anode material in sodium-ion batteries, but it generally shows poor cycling stability because of its large volume changes during sodium ion insertion and extraction processes. To alleviate or even overcome this problem, we develop a hybrid carbon encapsulation strategy to improve the anode performance of antimony through the combination of antimony/nitrogen-doped carbon (Sb/N-carbon) hybrid nanostructures and carbon nanotube (CNT) network. When evaluated as an anode material for sodium ion batteries, the as-synthesized Sb/N-carbon+CNTs composite exhibits superior cycling stability and rate performance in comparison with Sb/N-carbon or Sb/CNTs composite. A high charge capacity of 543 mA h g−1 with initial charge capacity retention of 87.7% are achieved after 200 cycles at a current density of 0.1 A g−1. Even under 10 A g−1, a reversible capacity of 231 mA h g−1 can be retained. The excellent sodium storage properties can be attributed to the formation of Sb−N bonding between antimony nanoparticle and the nitrogen-doped carbon shell in addition to the electronically conductive and flexible CNT network. The hybrid carbon encapsulation strategy is simple yet very effective, and it also provides new avenues for designing advanced anode materials for sodium-ion batteries.
    No preview · Article · Jan 2016 · The Journal of Physical Chemistry C
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    ABSTRACT: Sodium-ion batteries have recently attracted considerable attention as a promising alternative to lithium-ion batteries owing to the natural abundance and low cost of sodium compared with lithium. Among all proposed anode materials for sodium-ion batteries, antimony is a desirable candidate due to its high theoretical capacity (660 mA h g-1). Herein, an antimony/multilayer graphene hybrid, in which antimony is homogeneously anchored on multilayer graphene, is produced by a confined vapor deposition method. The chemical bonding can realize robust and intimate contact between antimony and multilayer graphene, and the uniform distribution of antimony and the highly conductive and flexible multilayer graphene can not only improve sodium ion diffusion and electronic transport but also stabilize the solid electrolyte interphase upon the large volume changes of antimony during cycling. Consequently, the antimony/multilayer graphene hybrid shows a high reversible sodium storage capacity (452 mA h g-1 at a current density of 100 mA g-1), stable long-term cycling performance with 90% capacity retention after 200 cycles, and excellent rate capability (210 mA h g-1 under 5000 mA g-1). This facile synthesis approach and unique nanostructure can potentially be extended to other alloy materials for sodium-ion batteries.
    No preview · Article · Nov 2015 · Chemistry of Materials
  • Yunxia Liu · Ling Si · Yichen Du · Xiaosi Zhou · Zhihui Dai · Jianchun Bao
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    ABSTRACT: Although lithium-selenium batteries have attracted significant attention for high-energy-density energy storage systems due to their high volumetric capacity, their implementation has been hampered by the dissolution of polyselenide intermediates into electrolyte. Herein, we report a novel selenium/microporous carbon nanofiber composite as a high-performance cathode for lithium-selenium batteries through binding selenium in microporous carbon nanofibers. Under vacuum and heat treatment, selenium particles are easily transformed into chainlike Se-n molecules that chemically bond with the inner surfaces of microporous carbon nanofibers. This chemical bonding can not only promote robust and intimate contact between selenium and carbonaceous nanofiber matrix but also alleviate the active material dissolution during cycling. Moreover, selenium is homogeneously distributed in the micropores of the highly conductive carbonaceous nanofiber matrix, which is favorable for the fast diffusions of both lithium ions and electrons. As a result, a high reversible capacity of 581 mA h g(-1) in the first cycle at 0.1 C and over 400 mA h g(-1) after 2000 cycles at 1 C with excellent cyclability and high rate performance (over 420 mA h g(-1) at 5 C, 3.39 A g(-1)) are achieved with the selenium/microporous carbon nanofibers composite as a cathode for lithium-selenium batteries, performing among the best of current selenium-carbon cathodes. This simple preparation method and strongly coupling hybrid nanostructure can be extended to other selenium-based alloy cathode materials for lithium-selenium batteries.
    No preview · Article · Nov 2015 · The Journal of Physical Chemistry C
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    ABSTRACT: In contrast to the extensive investigation of the electrochemical performance of conventional carbon materials in sodium-ion batteries, there has been scarcely any study of sodium storage property of fluorine-doped carbon. Here we report for the first time the application of fluorine-doped carbon particles (F-CP) synthesized through pyrolysis of lotus petioles as anode materials for sodium-ion batteries. Electrochemical tests demonstrate that the F-CP electrode delivers an initial charge capacity of 230 mA h g-1 at a current density of 50 mA g-1 between 0.001 and 2.8 V, which greatly outperforms the corresponding value of 149 mA h g-1 for the counterpart banana peels-derived carbon (BPC). Even under 200 mA g-1, the F-CP electrode could still exhibit a charge capacity of 228 mA h g-1 with initial charge capacity retention of 99.1% after 200 cycles compared to the BPC electrode with 107 mA h g-1 and 71.8%. The F-doping and the large interlayer distance as well as the disorder structure contribute to a lowering of the sodium ion insertion-extraction barrier, thus promoting the Na+ diffusion and providing more active sites for Na+ storage. In specific, the F-CP electrode shows longer low-discharge-plateau and better kinetics than does the common carbon-based electrode. The unique electrochemical performance of F-CP enriches the existing knowledge of the carbon-based electrode materials and broadens avenues for rational design of anode materials in sodium-ion batteries.
    No preview · Article · Sep 2015 · The Journal of Physical Chemistry C
  • Yichen Du · Xiaoshu Zhu · Ling Si · Yafei Li · Xiaosi Zhou · Jianchun Bao
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    ABSTRACT: Tungsten disulfide, which possesses a well-defined layered structure, has been intensively studied as an anode material for lithium ion batteries, but it usually suffers from poor cycling stability because of its large volume changes during lithium insertion and extraction processes. Herein, we develop a self-assembled double carbon coating to enhance the anode performance of WS2 via a self-assembly process between oleylamine-coated WS2 nanosheets and graphene oxide and subsequent pyrolysis treatment. When employed as an anode material for lithium ion batteries, the as-prepared WS2@C/reduced graphene oxide (WS2@C/RGO) composite exhibits excellent cycling stability and rate capability when compared to WS2@C nanosheets. A reversible capacity of 486 mA h g-1 and around 90% capacity retention were obtained after 200 cycles at a current density of 0.5 A g-1. Even under 10 A g-1, a high reversible capacity of 126 mA h g-1 can be retained. The good electrochemical performance could be attributed to the external electronically conductive and flexible RGO coating in addition to the surface carbon layer and the uniform distribution of WS2 nanosheets. The self-assembled dual carbon coating strategy is facile yet effective, and it may be applied to other high-capacity anode materials with huge volume changes and poor electrical conductivities.
    No preview · Article · Jul 2015 · The Journal of Physical Chemistry C
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    ABSTRACT: Silicon-based lithium-ion battery anodes have brought encouraging results to the current state-of-art battery technologies due to their high theoretical capacity, but their large-scale application has been hampered by a large volume change (>300%) of silicon upon lithium insertion and extraction, which leads to severe electrode pulverization and capacity degradation. Polymeric surfactants directing the combination of silicon nanoparticles and reduced graphene oxide have attracted great interest as promising choices for accommodating the huge volume variation of silicon. However, the influence of different polymeric surfactants on improving the electrochemical performances of silicon/reduced graphene oxide (Si/RGO) anodes remains unclear because of the different structural configurations of polymeric surfactants. Here, we systematically study the effect of different polymeric surfactants on enhancing the Si/RGO anode performance. Three of the most well-known polymeric surfactants, poly(sodium 4-styrenesulfonate) (PSS), poly(diallydimethylammonium chloride) (PDDA), and polyvinylpyrrolidone (PVP), were used to direct the combination of silicon nanoparticles and RGO through van der Waals interaction. The Si/RGO anodes made from these composites act as ideal models to investigate and compare how the van der Waals forces between polymeric surfactants and GO affect the final silicon anode performance from both experimental observations and theoretical simulations. We found that the capability of these three surfactants in enhancing long-term cycling stability and high-rate performance of the Si/RGO anodes decreased in the order of PVP > PDDA > PSS.
    No preview · Article · Mar 2015 · The Journal of Physical Chemistry C
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    ABSTRACT: Co3S4 porous nanosheets embedded in flexible graphene sheets have been synthesized through a simple freeze-drying and subsequent hydrazine treatment process. The robust structural stability of the as-prepared three-dimensional sandwich-like Co3S4–PNS/GS composite affords improved rate performance and cycling stability for both lithium and sodium storage.
    Preview · Article · Mar 2015
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    ABSTRACT: Ge nanoparticles/C composites are desirable electrode materials for high energy and power density lithium-ion batteries. However, the production of well-dispersed Ge nanoparticles in a carbon network remains a challenge because of rapid grain growth during high-temperature thermal reduction. Herein, we report a PVP-assisted hydrolysis approach for fabricating a Ge nanoparticles/reduced graphene oxide composite (denoted as Ge/RGO) made of ∼5 nm Ge nanoparticles that are uniformly distributed within a nitrogen-doped RGO carbon matrix. The Ge/RGO composite exhibits an initial discharge capacity of 1475 mA h g–1 and a reversible capacity of 700 mA h g–1 after 200 cycles at a current density of 0.5 A g–1. Moreover, Ge/RGO shows a capacity of 210 mA h g–1 even at a high current density of 10 A g–1. The excellent performance of the Ge/RGO composite is attributed to its unique nanostructure, including Ge nanoparticles, homogeneous particle distribution, and highly conductive RGO carbon matrix. These properties alleviate the pulverization problem, prevent Ge particle aggregation, and facilitate electron and lithium-ion transportation.
    No preview · Article · Dec 2014 · The Journal of Physical Chemistry C
  • Xiaosi Zhou · Xia Liu · Yan Xu · Yunxia Liu · Zhihui Dai · Jianchun Bao
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    ABSTRACT: Antimony has attracted enormous attention as anode materials for sodium-ion batteries owing to its high theoretical gravimetric capacity (∼660 mA h g–1). Despite the outstanding gravimetric capacity advantage, antimony suffers from unsatisfactory electrochemical performance originating from its huge volume changes during repeated sodium insertion/extraction. Herein, we synthesize an SbOx/reduced graphene oxide (SbOx/RGO) composite through a wet-milling approach accompanied by redox reaction between Sb and GO. When used as an anode material for sodium-ion batteries, SbOx/RGO exhibits high rate capability and stable cycling performance. A reversible capacity of 352 mA h g–1 was obtained even at a current density of 5 A g–1. More than 95% capacity retention (409 mA h g–1) was achieved after 100 cycles at a current density of 1 A g–1. The excellent electrochemical performance is due to the Sb–O bonding between nanometer-sized SbOx particles surface and highly conductive RGO, which can not only effectively prevent SbOx nanoparticles from aggregation upon cycling but also promote the electrons and sodium ions transportation.
    No preview · Article · Oct 2014 · The Journal of Physical Chemistry C
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    ABSTRACT: Hard carbons have been extensively investigated as anode materials for sodium-ion batteries due to their disordered structure and large interlayer distance, which facilitates sodium-ion uptake and release. Herein, we report a graphene-templated carbon (GTC) hybrid via a facile two-step strategy involving a graphene oxide-directed self-assembly process and subsequent pyrolysis treatment. When evaluated as an anode material for sodium-ion batteries, the GTC electrode exhibits ultralong cycling stability and excellent rate capability. A reversible capacity of 205 mA h.g(-1) and more than 92% capacity retention were achieved after 2000 cycles at a current density of 200 mA g(-1). Even at 10 A g(-1) a high reversible capacity of 45 mA h g(-1) can be obtained. The superior electrochemical performance is due to the strong coupling effect between graphitic nanocrystallites and the graphene template and the large interlayer distance of the graphitic nanocrystallites, both of which can not only effectively relieve the sodiation-induced stress and preserve the electrode integrity during cycling but also promote the electron and sodium-ion transport.
    No preview · Article · Oct 2014 · The Journal of Physical Chemistry C
  • Xiaosi Zhou · Yunxia Liu · Ling Si · Xia Liu · Yan Xu · Jianchun Bao · Zhihui Dai
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    ABSTRACT: A novel selenium-carbon composite has been fabricated by embedding selenium in metal-organic framework-derived microporous carbon polyhedrons. Such interconnected microporous carbon polyhedrons possess a large surface area and pore volume to effectively confine Se, and suppress the dissolution of polyselenides in electrolyte. This selenium-carbon composite shows ultrastable cycling performance when used as a cathode material for lithium-selenium batteries.
    No preview · Article · Sep 2014
  • Xiaosi Zhou · Zhihui Dai · Shuhu Liu · Jianchun Bao · Yu-Guo Guo
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    ABSTRACT: Ultra-uniform SnOx /carbon nanohybrids for lithium-ion batteries are successfully prepared by solvent replacement and subsequent electrospinning. The resulting 1D nanostructure with Sn-N bonding between the SnOx and N-containing carbon nanofiber matrix can not only tolerate the substantial volume change and suppress the aggregation of SnOx , but also enhances the transport of both electrons and ions for the embedded SnOx , thus leading to high cycling performance and rate capability.
    No preview · Article · Jun 2014 · Advanced Materials
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    Xiaosi Zhou · Yu‐Guo Guo
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    ABSTRACT: Organized chaos: A highly disordered carbon composite is synthesized through self-assembly and subsequent pyrolysis. When evaluated as an anode material for room-temperature sodium-ion batteries, the as-obtained carbon delivers superior electrochemical characteristics in terms of reversible capacity, cycling performance, and rate capability.
    Full-text · Article · Jan 2014
  • Xiaosi Zhou · Jianchun Bao · Zhihui Dai · Yu-Guo Guo
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    ABSTRACT: Tin possesses a high theoretical specific capacity as anode materials for Li-ion batteries, and considerable efforts have been contributed to mitigating the capacity fading along with its huge volume expansion during lithium insertion and extraction processes, mainly through nanostructured material design. Herein, we present Sn nanoparticles encapsulated in nitrogen-doped graphene sheets through heat-treatment of the SnO2 nanocrystals/nitrogen-doped graphene hybrid. The specific architecture of the as-prepared Sn@N-RGO involves three advantages, including a continuous graphene conducting network, coating Sn surface through Sn–N and Sn–O bonding generated between Sn nanoparticles and graphene, and porous and flexible structure for accommodating the large volume changes of Sn nanoparticles. As an anode material for lithium-ion batteries, the hybrid exhibits a reversible capacity of 481 mA h g–1 after 100 cycles under 0.1 A g–1 and a charge capacity as high as 307 mA h g–1 under 2 A g–1.
    No preview · Article · Nov 2013 · The Journal of Physical Chemistry C
  • Xiaosi Zhou · Zhihui Dai · Jianchun Bao · Yu-Guo Guo
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    ABSTRACT: A uniform mixture of nano-sized Sb particles and MWCNTs is achieved by using wet milling to provide fast ionic diffusion and electronic transportation, and the cycling performance and rate capability of the as-obtained nanocomposite are significantly improved when tested as an anode material for sodium-ion batteries.
    No preview · Article · Oct 2013
  • Xiaosi Zhou · Li-Jun Wan · Yu-Guo Guo
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    ABSTRACT: Si-C hybrid nanofibers with a core-shell structure of Si nanoparticles confined in porous carbon nanofibers are fabricated by a single-nozzle electrospinning technique. The as-obtained Si nanoparticles/porous carbon hybrid nanofibers exhibit excellent properties in terms of cycling performance and rate capabilities for application as anode materials for lithium-ion batteries.
    No preview · Article · Aug 2013 · Small
  • Xiaosi Zhou · Yu-Guo Guo
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    ABSTRACT: We have developed a PEO-assisted electrospinning method for accommodating silicon nanoparticles in hierarchical conducting networks consisting of graphene and carbon nanoparticles to obtain a silicon–graphene composite. When evaluated as an anode material for lithium-ion batteries, Si–G–C exhibits excellent cycling performance and rate capability.
    No preview · Article · Jul 2013
  • Xiaosi Zhou · Li-Jun Wan · Yu-Guo Guo
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    ABSTRACT: Hybrid anode materials for Li-ion batteries are fabricated by binding SnO(2) nanocrystals (NCs) in nitrogen-doped reduced graphene oxide (N-RGO) sheets by means of an in situ hydrazine monohydrate vapor reduction method. The SnO(2) NCs in the obtained SnO(2) NC@N-RGO hybrid material exhibit exceptionally high specific capacity and high rate capability. Bonds formed between graphene and SnO(2) nanocrystals limit the aggregation of in situ formed Sn nanoparticles, leading to a stable hybrid anode material with long cycle life.
    No preview · Article · Apr 2013 · Advanced Materials
  • Xiaosi Zhou · Li-Jun Wan · Yu-Guo Guo
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    ABSTRACT: A facile method to synthesize a MoS(2) nanosheet-graphene nanosheet hybrid has been developed via the combination of a lithiation-assisted exfoliation process and a hydrazine monohydrate vapour reduction technique. The as-obtained nanosheet-nanosheet hybrid is more robust and exhibits much improved cycle life (>700), which make it an efficient morphological solution to the stable lithium storage problem of nanomaterials.
    No preview · Article · Jan 2013 · Chemical Communications
  • Xiaosi Zhou · An-Min Cao · Li-Jun Wan · Yu-Guo Guo
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    ABSTRACT: Si has been considered as a promising anode material but its practical application has been severely hindered due to poor cyclability caused by the large volume change during charge/discharge. A new and effective protocol has been developed to construct Si nanoparticle/graphene electrodes with a favorable structure to alleviate this problem. Starting from a stable suspension of Si nanoparticles and graphene oxide in ethanol, spin-coating can be used as a facile method to cast a spin-coated Si nanoparticle/graphene (SC-Si/G) film, in which graphene can act as both an efficient electronic conductor and effective binder with no need for other binders such as polyvinylidenefluoride (PVDF) or polytetrafluoroethylene (PTFE). The prepared SC-Si/G electrode can achieve a high-performance as an anode for lithium-ion batteries benefiting from the following advantages: i) the graphene enhances the electronic conductivity of Si nanoparticles and the void spaces between Si nanoparticles facilitate the lithium ion diffusion, ii) the flexible graphene and the void spaces can effectively cushion the volume expansion of Si nanoparticles. As a result, the binder-free electrode shows a high capacity of 1611 mA·h·g−1 at 1 A·g−1 after 200 cycles, a superior rate capability of 648 mA·h·g−1 at 10 A·g−1, and an excellent cycle life of 200 cycles with 74% capacity retention.
    No preview · Article · Dec 2012 · Nano Research

Publication Stats

1k Citations
208.50 Total Impact Points

Institutions

  • 2013-2015
    • Nanjing Normal University
      • College of Chemistry and Materials Science
      Nan-ching, Jiangsu Sheng, China
  • 2012-2014
    • Technical Institute of Physics and Chemistry
      Peping, Beijing, China
  • 2008-2013
    • Chinese Academy of Sciences
      • Institute of Chemistry
      Peping, Beijing, China