高压下钨酸锂修饰的 LiNiCoMnO 正极材料的电化学性能。
Electrochemical Properties of the LiNiCoMnO Cathode Material Modified by Lithium Tungstate under High Voltage.
机构信息
School of Materials Science and Engineering, Beijing Key Laboratory of Environment Science and Engineering , Beijing Institute of Technology , Beijing 100081 , China.
Collaborative Innovation Center of Electric Vehicles in Beijing , Beijing 100081 , China.
出版信息
ACS Appl Mater Interfaces. 2018 Jun 13;10(23):19704-19711. doi: 10.1021/acsami.8b04167. Epub 2018 May 31.
An amount (5 wt %) of lithium tungstate (LiWO) as an additive significantly improves the cycle and rate performances of the LiNiCoMnO electrode at the cutoff voltage of 4.6 V. The 5 wt % LiWO-mixed LiNiCoMnO electrode delivers a reversible capacity of 199.2 mA h g and keeps 73.1% capacity for 200 cycles at 1 C. It retains 67.4% capacity after 200 cycles at 2 C and delivers a discharge capacity of 167.3 mA h g at 10 C, while those of the pristine electrode are only 44.7% and 87.5 mA h g, respectively. It is shown that the structure of the LiNiCoMnO cathode material is not affected by mixing LiWO. The introduced LiWO effectively restrains the LiPF and carbonate solvent decomposition by consuming PF at high cutoff voltage, forming a stable cathode/electrolyte interface film with low resistance.
在 5wt%的添加剂钨酸锂（LiWO）的作用下，LiNiCoMnO 电极在 4.6V 的截止电压下的循环和倍率性能得到了显著提高。5wt%LiWO 混合的 LiNiCoMnO 电极在 1C 下循环 200 次后，可逆容量为 199.2mAh/g，容量保持率为 73.1%。在 2C 下循环 200 次后，容量保持率为 67.4%，在 10C 下的放电容量为 167.3mAh/g，而原始电极的放电容量仅为 44.7mAh/g 和 87.5mAh/g。结果表明，LiWO 的掺杂并未影响 LiNiCoMnO 正极材料的结构。引入的 LiWO 在高截止电压下通过消耗 PF 来有效抑制 LiPF6 和碳酸盐溶剂的分解，形成具有低电阻的稳定的正极/电解质界面膜。
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