期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 38, 页码 35030-35038出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13190
关键词
garnet electrolytes; H+/Li+ exchange; AgNO3 aqueous solution; in situ modification; interfacial stability; solid-state Li batteries
资金
- National Key R&D Program of China [2018YFB0905400]
- National Natural Science Foundation of China (NSFC) [51772315]
- Science and Technology Commission of Shanghai Municipality [18DZ2280800]
Garnet-type solid-state electrolytes (SSEs) show a promising application in solid-state Li batteries. Poor interfacial contact with lithium causing large interfacial impedance and dendrite penetration is a problem. Inspired by unique H+/Li+ exchange of garnet electrolyte, we used an AgNO3 aqueous solution induced strategy to construct a lithiophilic layer in situ on the garnet surface without any specific apparatus. Experimental analysis reveals the uniform distribution of Ag nanoparticles and significantly enhanced affinity between the solid state electrolyte (SSE) and Li anode for the Li-Ag alloying. As expected, the interfacial area specific resistance (ASR) is greatly reduced to similar to 4.5 Omega cm(-2), accompanying with long-cycling stability for similar to 3500 h at 0.2 mA cm(-2) and high critical current density of 0.75 mA cm(-2). With modified SSEs, quasi-solid-state batteries with a LiFePO4 or LiNi0.5Co0.2Mn0.3O2 cathode operate well at room temperature and an all-solid-state LiFePO4 /garnet/Li battery displays good cycling stability for over 200 cycles at 60 degrees C.
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