Wang Hansen, Xie Zhangdi, Liu Chengyong, Hu Bobing, Liao Shangju, Yan Xiaolin, Ye Fangjun, Huang Shengyuan, Guo Yongsheng, Ouyang Chuying
21C LAB, Contemporary Amperex Technology Co., Limited, Ningde, Fujian 352000, China.
Department of Physics, Jiangxi Normal University, Nanchang, Jiangxi 330022, China.
ACS Appl Mater Interfaces. 2023 Mar 15;15(10):12967-12975. doi: 10.1021/acsami.2c20422. Epub 2023 Mar 6.
Anode-free lithium (Li) metal batteries (AFLMBs) could provide a specific energy over 500 Wh/kg, but their cycle life requires improvement. In this work, we propose a new method to calculate the real Coulombic efficiency (CE) of the Li metal during the cycling of AFLMBs. Through this approach, we find low rate discharging unfavorable for Li CE, which is mitigated through electrolyte optimization. In contrast, high rate discharging boosts Li reversibility, indicating AFLMBs to be intrinsically suited for high power use cases. However, AFLMBs still fail rapidly, due to the Li stripping overpotential buildup, which is mitigated by a zinc coating that enables a better electron/ion transferring network. We believe well-targeted strategies need to be better developed to synergize with the intrinsic features of AFLMBs to enable their commercialization in the future.
无阳极锂金属电池（AFLMBs）的比能量可超过500 Wh/kg，但它们的循环寿命有待提高。在这项工作中，我们提出了一种新方法来计算AFLMBs循环过程中锂金属的实际库仑效率（CE）。通过这种方法，我们发现低倍率放电不利于锂CE，而通过电解质优化可缓解这一问题。相比之下，高倍率放电可提高锂的可逆性，这表明AFLMBs本质上适用于高功率应用场景。然而，由于锂剥离过电位的积累，AFLMBs仍然会迅速失效，而锌涂层可缓解这一问题，因为它能形成更好的电子/离子传输网络。我们认为，需要更好地制定有针对性的策略，以与AFLMBs的固有特性协同作用，从而在未来实现其商业化。
