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Published on: August 12, 2013
Dendrite-Free Lithium Deposition via Flexible-Rigid Coupling Composite Network for LiNi0.5 Mn1.5 O4 /Li Metal
Jingchao Chai1,2, Bingbing Chen1, Fang Xian1
1Qingdao Industrial Energy Storage Technology Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 26101, Qingdao, China.
Abstract:
Notorious lithium dendrite causes severe capacity fade and harsh safety issues of lithium metal batteries, which hinder the practical applications of lithium metal electrodes in higher energy rechargeable batteries. Here, a kind of 3D-cross-linked composite network is successfully employed as a flexible-rigid coupling protective layer on a lithium metal electrode. During the plating/stripping process, the composite protective layer would enable uniform distribution of lithium ions in the adjacent regions of the lithium electrode, resulting in a dendrite-free deposition at a current density of 2 mA cm-2 . The LiNi0.5 Mn1.5 O4 -based lithium metal battery presents an excellent cycling stability at a voltage range of 3.5-5.0 V with the induction of 3D-cross-linked composite protective layer. From an industrial field application of view, thin lithium metal electrodes (40 µm, with 4 times excess lithium) can be used in LiNi0.5 Mn1.5 O4 (with industrially significant loading of 18 mg cm-2 and 2.6 mAh cm-2 )-based lithium metal batteries, which reveals a promising opportunity for practical applicability in high energy lithium metal batteries.
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