CAS Key Laboratory of Materials for Energy Conversion , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , China.
Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , China.
ACS Appl Mater Interfaces. 2019 Sep 25;11(38):35030-35038. doi: 10.1021/acsami.9b13190. Epub 2019 Sep 12.
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 AgNO 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 ∼4.5 Ω cm, accompanying with long-cycling stability for ∼3500 h at 0.2 mA cm and high critical current density of 0.75 mA cm. With modified SSEs, quasi-solid-state batteries with a LiFePO or LiNiCoMnO cathode operate well at room temperature and an all-solid-state LiFePO/garnet/Li battery displays good cycling stability for over 200 cycles at 60 °C.
石榴石型固态电解质（SSE）在固态锂电池中有很好的应用前景。与锂的界面接触不良导致大的界面阻抗和枝晶渗透是一个问题。受石榴石电解质独特的 H/Li 交换启发，我们使用 AgNO₃水溶液诱导策略，在石榴石表面原位构建亲锂层，而无需任何特定设备。实验分析表明，Ag 纳米颗粒均匀分布，固态电解质（SSE）与 Li 阳极之间的亲和力显著增强，有利于 Li-Ag 合金化。不出所料，界面面积比电阻（ASR）大大降低至约 4.5 Ω cm，在 0.2 mA cm 的电流密度下循环 3500 小时以上表现出良好的长循环稳定性，临界电流密度高达 0.75 mA cm。使用改性的 SSE，具有 LiFePO 或 LiNiCoMnO 阴极的准固态电池在室温下运行良好，全固态 LiFePO/石榴石/Li 电池在 60°C 下循环 200 次以上仍具有良好的循环稳定性。
