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The charge compensation mechanism of LRLO for HDOD and LDOD cycling. (a) The dQ/dV curves of HDOD (2.7–4.5 V) and LDOD (3.3–4.5 V) cycling from 5th to 50th cycles at a current of 115 mA/g and the 51th cycle at a current of 23 mA/g within the voltage ranges of 2.0–4.5 V (extend cycle). The dQ/dV curves of the 51th cycle discharge state are presented. (b) the O K‐edge absorption spectra and corresponding differential spectra after 50 cycles charge states (4.5 V, green area) and discharge states (yellow area) at HDOD (2.7 V) and LDOD (3.3 V) cycling. (c) Evolution of normalized XANES spectra of Ni K‐edge during the initial discharge process and the 1st and 50th discharge states under HDOD (2.7 V) and LDOD (3.3 V) cycling. (d) The models of reversible redox capacity changes for O and Ni during long cycles of HDOD and LDOD cycling.
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More and more basic practical application scenarios have been gradually ignored/disregarded, in fundamental research on rechargeable batteries, e.g. assessing cycle life under various depths‐of‐discharge (DODs). Herein, although benefit from the additional energy density introduced by anionic redox, we critically revealed that lithium‐rich layered...
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Citations
This review systematically discusses the structure, reaction mechanisms, and challenges as well as countermeasures for high-voltage Li-rich, LiCoO 2 , and Ni-rich cathode materials, attributing their anion redox activity to O 2p non-bonding states.
