Hao Shuaiguo, Ma Zhipeng, Zhao Yao, Kong Lina, He Haoyan, Shao Guangjie, Qin Xiujuan, Gao Weimin
Hebei Key Laboratory of Applied Chemistry, Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
ACS Omega. 2020 Apr 3;5(14):8299-8304. doi: 10.1021/acsomega.0c00729. eCollection 2020 Apr 14.
A lithium metal anode is regarded as the most promising anode material for the next generation of high-energy density batteries because of its high specific capacity and low reduction potential. However, dendritic deposition and severe side reactions in continuous Li plating/stripping inevitably hinder the practical application of Li metal batteries. A solid polymer electrolyte protective layer with synergistic LiPO/polyvinyl alcohol (PVA) features is in situ constructed on a lithium metal anode to obtain a stable interface during charge/discharge cycles. The protective layer can adapt to volume changes and inhibit lithium dendrites. The in situ reaction guaranteed the uniformity of ion transport and a tight interface between the protective layer and the lithium metal, so that the lithium deposition behavior was effectively regulated. The PP-Li anode presented a stable Li plating/stripping for 1000 h in a symmetrical cell system and exhibited an enhanced performance of the lithium titanium oxide cell. The in situ LiPO/PVA solid polymer electrolyte protective layer provided a promising strategy to tackle the challenges raised by the intrinsic properties of the lithium metal anode.
锂金属负极因其高比容量和低还原电位，被视为下一代高能量密度电池最具前景的负极材料。然而，连续的锂电镀/剥离过程中的枝晶沉积和严重的副反应不可避免地阻碍了锂金属电池的实际应用。在锂金属负极上原位构建具有协同LiPO/聚乙烯醇（PVA）特性的固体聚合物电解质保护层，以在充放电循环期间获得稳定的界面。该保护层能够适应体积变化并抑制锂枝晶。原位反应保证了离子传输的均匀性以及保护层与锂金属之间紧密的界面，从而有效调控了锂沉积行为。在对称电池体系中，PP-Li负极实现了1000小时稳定的锂电镀/剥离，并展现出锂钛氧化物电池增强的性能。原位LiPO/PVA固体聚合物电解质保护层为应对锂金属负极固有特性带来的挑战提供了一种有前景的策略。
