An LLTO-containing heterogeneous composite electrolyte with a stable interface for solid-state lithium metal batteries

被引:5
作者
Bi, Jiaying [1 ,2 ]
Zhang, Ling [2 ,3 ]
Wu, Borong [2 ,3 ,4 ]
Xiao, Meixia [1 ]
Wang, Lei [1 ]
Li, Zhao [1 ]
机构
[1] Xian Shiyou Univ, Coll New Energy, Xian 710065, Peoples R China
[2] Beijing Inst Technol, Beijing Key Lab Environm Sci & Engn, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[3] Beijing Inst Technol, Chongqing Innovat Ctr, Chongqing 401120, Peoples R China
[4] Beijing Inst Technol, Beijing Higher Inst Engn Res Ctr Power Battery &, Beijing 100081, Peoples R China
基金
中国国家自然科学基金;
关键词
GEL POLYMER ELECTROLYTE; HIGH IONIC-CONDUCTIVITY; PVDF-HFP; TRANSFERENCE NUMBER; LANTHANUM TITANATE; HIGH-ENERGY;
D O I
10.1039/d3dt01677c
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The interaction between Li0.33La0.56TiO3 (LLTO) and metallic lithium leads to severe interfacial instability of LLTO-containing solid-state electrolytes with a lithium metal anode. To improve the interfacial stability, a heterogeneous composite electrolyte PVDF-HFP@LLTO/PEO (PLTP) is designed and fabricated with a PEO electrolyte layer adhered to the PVDF-HFP@LLTO (PLT) electrolyte membrane. The PLTP heterogeneous composite electrolyte exhibits a superior ionic conductivity of 3.23 x 10-4 S cm-1 at 60 degrees C and a highly stable electrochemical window of up to 4.7 V (vs. Li/Li+). Remarkably, taking advantage of the effective protection of the PEO electrolyte layer, the chemical stability at the electrolyte/lithium metal anode interface is significantly enhanced. As a result, solid-state Li||LiFePO4 and Li||LiNi0.6Co0.2Mn0.2O2 batteries with the heterogeneous electrolyte exhibit an impressive electrochemical performance with high Coulombic efficiency and stable cycling capability. The strengthened interfacial stability enables the heterogeneous electrolyte to be a promising alternative for the further development of solid-state lithium metal batteries. An LLTO-containing heterogeneous PLTP electrolyte exhibits excellent ionic conductivity and interfacial stability in high-voltage lithium metal batteries.
引用
收藏
页码:14064 / 14074
页数:11
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