材料科学
电解质
阳极
锂(药物)
复合数
环氧乙烷
电化学
化学工程
扫描电子显微镜
氧化物
复合材料
电极
共聚物
聚合物
化学
物理化学
冶金
内分泌学
工程类
医学
作者
C. A. Wang,Yifu Yang,Xingjiang Liu,Hai Zhong,Xu Han,Zhibin Xu,Huixia Shao,Fei Ding
标识
DOI:10.1021/acsami.7b00336
摘要
The formation of lithium dendrites is suppressed using a Li1.5Al0.5Ge1.5(PO4)3-poly(ethylene oxide) (LAGP-PEO) composite solid electrolyte and a PEO (lithium bis(trifluoromethane)sulfonimide) [PEO (LiTFSI)]-modified lithium metal anode in all-solid-state lithium batteries. The effects on the anode performance based on the PEO content in the composite solid electrolyte and the molecular weight of PEO used to modify the Li anode are studied. The structure, surface morphology, and stability of the composite solid electrolyte are examined by X-ray diffraction spectroscopy, scanning electron microscopy, and electrochemical tests. Results show that the presence of a PEO-500000(LiTFSI) film on a Li anode results in good mechanical properties and satisfactory interface contact features. The film can also prevent Li from reacting with LAGP. Furthermore, the formation of lithium dendrites can be effectively inhibited as the composite solid electrolyte is combined with the PEO film on the Li anode. The ratio of PEO in the composite solid electrolyte can be reduced to a low level of 1 wt %. PEO remains stable even at a high potential of 5.12 V (vs Li/Li+). The assembled Li-PEO (LiTFSI)/LAGP-PEO/LiMn0.8Fe0.2PO4 all-solid-state cell can deliver an initial discharge capacity of 160.8 mAh g-1 and exhibit good cycling stability and rate performance at 50 °C.
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