Reversible phase transition enabled by binary Ba and Ti-based surface modification for high voltage LiCoO2 cathode
Reversible phase transition enabled by binary Ba and Ti-based surface modification for high voltage LiCoO2 cathode
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通过二元 Ba 和 Ti 基表面改性实现高压 LiCoO2 阴极的可逆相变
DOI：
10.1016/j.jpowsour.2019.226954
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发表时间：
2019-10
影响因子：
9.2
通讯作者：
Hu Bingwen
中科院分区：
文献类型：
--
作者：
Hu Bei;Lou Xiaobing;Li Chao;Geng Fushan;Zhao Chong;Wang Jianyin;Shen Ming;Hu Bingwen
LiCoO 2（LCO）作为一种广泛应用的商用锂离子电池正极材料，由于其结构不可逆性和表面副反应，其循环寿命、实际可逆容量和高压倍率性能受到限制。在这里，我们采用二元Ba和Ti基混合表面处理LiCoO 2（LCO@BT）通过简易的湿化学路线。这种策略结合了界面粒子掺杂和表面包覆的优点，因为二元混合表面处理稳定了LCO的层状结构，并且改性层促进了表面Li+扩散率，并保护LCO阴极免受表面副反应引起的稳定腐蚀。基于原位NMR表征，发现在第一次电化学脱锂/锂化之后，相可逆地从LCO@BT中的O3-I型转变回到O3-I型LxCO@BT（0.98 ≤ x<1），而不是未涂覆的LxCO中的O3-I和O3-II相的两相域（x<0.98）。该靶材可实现190.5 mAh g− 1的初始放电容量，并在0.2C下100次循环后提供90.29%（172 mAh g−1）的高容量保持率，这上级在4.5V的高截止电压下操作的大多数LiCoO 2阴极。
As a popular commercialized cathode material in lithium-ion batteries, the cycle life, practical reversible capacity, and rate capabilities of LiCoO2(LCO) at high voltage are limited owning to structural irreversibility and surface side reactions. Here, we employ a binary Ba and Ti-based hybrid surface treatment on LiCoO2(LCO@BT) by facile wet chemical routes. This strategy integrates the advantages of both interface particle doping and surface coating as the layered structure of LCO is stabilized by a binary hybrid surface treatment, and the modified layer promotes the surface Li+diffusivity and protects the LCO cathode from steady corrosion induced by surface side reaction. On the basis of in-situ NMR characterizations, it is found that after the first electrochemical delithiation/lithiation the phase reversibly changes from O3–I-type in LCO@BT and back to O3–I-type LxCO@BT (0.98 ≤ x<1) rather than to a two-phase domain of O3–I and O3-II phase in uncoated LxCO (x<0.98). The target material is achievable in displaying an initial discharge capacity of 190.5 mAh g−1and delivers a high capacity retention of 90.29% (172 mAh g−1) at 0.2C after 100 cycles which is superior to most LiCoO2cathodes that are operated at high cut-off voltage of 4.5V.
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影响因子：
16.6
作者：
Qian J;Liu L;Yang J;Li S;Wang X;Zhuang HL;Lu Y
通讯作者：
Lu Y
影响因子：
3.7
作者：
Van der Ven, A;Aydinol, MK;Hafner, J
通讯作者：
Hafner, J
影响因子：
6.6
作者：
Qin Hao;Houyi Ma;Zhicheng Ju;Guangda Li;Xiaowei Li;Liqiang Xu;Y. Qian
通讯作者：
Qin Hao;Houyi Ma;Zhicheng Ju;Guangda Li;Xiaowei Li;Liqiang Xu;Y. Qian
影响因子：
6.6
作者：
K. Shimoda;M. Murakami;D. Takamatsu;H. Arai;Y. Uchimoto;Z. Ogumi
通讯作者：
K. Shimoda;M. Murakami;D. Takamatsu;H. Arai;Y. Uchimoto;Z. Ogumi
影响因子：
27.8
作者：
Qing, Ren-Peng;Shi, Ji-Lei;Guo, Yu-Guo
通讯作者：
Guo, Yu-Guo