Chin Moo Cho

Publications (3)9.29 Total impact

• Article: Synthesis of Heterogeneous Li4Ti5O12 Nanostructured Anodes with Long-Term Cycle Stability

  Duk Kyu Lee, Hyun-Woo Shim, Jae Sul An, Chin Moo Cho, In-Sun Cho, Kug Sun Hong, Dong-Wan Kim
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  ABSTRACT: The 0D-1D Lithium titanate (Li4Ti5O12) heterogeneous nanostructures were synthesized through the solvothermal reaction using lithium hydroxide monohydrate (Li(OH)·H2O) and protonated trititanate (H2Ti3O7) nanowires as the templates in an ethanol/water mixed solvent with subsequent heat treatment. A scanning electron microscope (SEM) and a high resolution transmission electron microscope (HRTEM) were used to reveal that the Li4Ti5O12 powders had 0D-1D heterogeneous nanostructures with nanoparticles (0D) on the surface of wires (1D). The composition of the mixed solvents and the volume ratio of ethanol modulated the primary particle size of the Li4Ti5O12 nanoparticles. The Li4Ti5O12 heterogeneous nanostructures exhibited good capacity retention of 125mAh/g after 500 cycles at 1C and a superior high-rate performance of 114mAh/g at 20C. KeywordsLi4Ti5O12 -Nanowires-Solvothermal reaction-Capacity retention-Li ion batteries
  Nanoscale Research Letters 04/2012; 5(10):1585-1589. · 2.73 Impact Factor
• Article: Size-controlled synthesis of monodispersed mesoporous α-alumina spheres by a template-free forced hydrolysis method.

  Hee-Suk Roh, Geun Kyu Choi, Jae-Sul An, Chin Moo Cho, Dong Hoe Kim, Ik Jae Park, Tae Hoon Noh, Dong-Wan Kim, Kug Sun Hong
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  ABSTRACT: We demonstrated the formation of monodispersed spherical aluminum hydrous oxide precursors with tunable sizes by controlling the variables of a forced hydrolysis method. The particle sizes of aluminum hydrous oxide precursors were strongly dependent on the molar ratio of the Al(3+) reactants (sulfates and nitrates). In addition, the systematic phase and morphological evolutions from aluminum hydrous oxide to γ-alumina (Al(2)O(3)) and finally to α-Al(2)O(3) through thermal dehydrogenation were characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). After annealing the amorphous aluminum hydrous oxide in air at 900 °C and 1100 °C for 1 h, we observed complete conversion to phase-pure γ- and α-Al(2)O(3), respectively, while maintaining monodispersity (125 nm, 195 nm, 320 nm, and 430 nm diameters were observed). Furthermore, both γ- and α-Al(2)O(3) were found to be mesoporous in structure, providing enhanced specific surface areas of 102 and 76 m(2) g(-1), respectively, based on the Brunauer-Emmett-Teller (BET) measurement.
  Dalton Transactions 07/2011; 40(26):6901-5. · 3.84 Impact Factor
• Source

  Available from: In-Sun Cho

  Article: Synthesis of Heterogeneous Li(4)Ti(5)O(12) Nanostructured Anodes with Long-Term Cycle Stability.

  Duk Kyu Lee, Hyun-Woo Shim, Jae Sul An, Chin Moo Cho, In-Sun Cho, Kug Sun Hong, Dong-Wan Kim
  [show abstract] [hide abstract]
  ABSTRACT: The 0D-1D Lithium titanate (Li(4)Ti(5)O(12)) heterogeneous nanostructures were synthesized through the solvothermal reaction using lithium hydroxide monohydrate (Li(OH)·H(2)O) and protonated trititanate (H(2)Ti(3)O(7)) nanowires as the templates in an ethanol/water mixed solvent with subsequent heat treatment. A scanning electron microscope (SEM) and a high resolution transmission electron microscope (HRTEM) were used to reveal that the Li(4)Ti(5)O(12) powders had 0D-1D heterogeneous nanostructures with nanoparticles (0D) on the surface of wires (1D). The composition of the mixed solvents and the volume ratio of ethanol modulated the primary particle size of the Li(4)Ti(5)O(12) nanoparticles. The Li(4)Ti(5)O(12) heterogeneous nanostructures exhibited good capacity retention of 125 mAh/g after 500 cycles at 1C and a superior high-rate performance of 114 mAh/g at 20C.
  Nanoscale Research Letters 01/2010; 5(10):1585-1589. · 2.73 Impact Factor