The Boundary of Lithium Plating in Graphite Electrode for Safe Lithium-Ion Batteries
The Boundary of Lithium Plating in Graphite Electrode for Safe Lithium-Ion Batteries
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DOI：
10.1002/anie.202102593
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发表时间：
2021-05-05
影响因子：
16.6
通讯作者：
Zhang, Qiang
中科院分区：
文献类型：
--
作者：
Cai, Wenlong;Yan, Chong;Zhang, Qiang
在石墨电极上不加控制地镀锂危及电池的寿命和安全，促使了旨在消除镀锂的巨大努力。本文系统地研究了安全锂离子电池用石墨电极的电镀锂边界问题。通过确定石墨阳极中均匀镀锂的耐受量，该电池表现出了优于锂树枝晶的安全性能。由于Li电镀的均匀分布，可以消除“死Li”的存在，在可逆电镀/剥离过程中沉积Li的平均库仑效率可高达99.5%左右。由于LiNi0.5Mn0.3Co0.2O2|石墨电池的充放电容量有限，库仑效率高，在500次循环中容量保持率高达80.2%。这项工作对进一步提高实用型锂离子电池的快速充电能力、低温性能和能量密度具有不同的意义。
Uncontrolled Li plating in graphite electrodes endangers battery life and safety, driving tremendous efforts aiming to eliminate Li plating. Herein we systematically investigate the boundary of Li plating in graphite electrode for safe lithium-ion batteries. The cell exhibits superior safety performance than that with Li dendrites by defining the endurable amount of uniform Li plating in graphite anode. The presence of "dead Li" can be eliminated owing to the uniform distribution of Li plating, and the average Coulombic efficiency for deposited Li during reversible plating/stripping process is decoupled as high as about 99.5 %. Attributing to the limited Li plating with superior Coulombic efficiency, the LiNi0.5Mn0.3Co0.2O2 | graphite cell achieves a high capacity retention of 80.2 % over 500 cycles. This work sheds a different light on further improving the fast-charging capability, low-temperature performance, and energy density of practical lithium-ion batteries.