nn9b08803_si_001.pdf (573.53 kB)
Download fileHighly Adhesive Li-BN Nanosheet Composite Anode with Excellent Interfacial Compatibility for Solid-State Li Metal Batteries
journal contribution
posted on 2019-12-02, 15:41 authored by Jiayun Wen, Ying Huang, Jian Duan, Yongmin Wu, Wei Luo, Lihui Zhou, Chenchen Hu, Liqiang Huang, Xueying Zheng, Wenjuan Yang, Zhaoyin Wen, Yunhui HuangSolid-state lithium metal batteries (SSLMBs) are promising
energy
storage devices by employing lithium metal anodes and solid-state
electrolytes (SSEs) to offer high energy density and high safety.
However, their efficiency is limited by Li metal/SSE interface barriers,
including insufficient contact area and chemical/electrochemical incompatibility.
Herein, a strategy to effectively improve the adhesiveness of Li metal
to garnet-type SSE is proposed by adding only a few two-dimensional
boron nitride nanosheets (BNNS) (5 wt %) into Li metal by triggering
the transition from point contact to complete adhesion between Li
metal and ceramic SSE. The interface between the Li-BNNS composite
anode and the garnet exhibits a low interfacial resistance of 9 Ω
cm2, which is significantly lower than that of bare Li/garnet
interface (560 Ω cm2). Furthermore, the enhanced
contact and the additional BNNS in the interface act synergistically
to offer a high critical current density of 1.5 mA/cm2 and
a stable electrochemical plating/striping over 380 h. Moreover, the
full cell paired with the Li-BNNS composite anode and the LiFePO4 cathode shows stable cycling performance at room temperature.
Our results introduce an appealing composite strategy with two-dimensional
materials to overcome the interface challenges, which provide more
opportunities for the development of SSLMBs.