In Situ Polymerization Permeated Three‐Dimensional Li+‐Percolated Porous Oxide Ceramic Framework Boosting All Solid‐State Lithium Metal Battery

Advanced Science

Shanmu Dong¹  Feng Jiang¹  Qinglei Wang¹  Yanfen Zhang¹  Jiangwei Ju¹  Guanglei Cui¹  Yiyuan Yan¹  Lang Huang¹  Yantao Wang¹  Longfei Cui¹ 

[1] Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 P. R. China;

关键词: composite electrolyte;    flexible–rigid coupling solid electrolyte;    in situ polymerization;    porous framework;    solid‐state lithium battery;   

DOI  :  10.1002/advs.202003887

来源: DOAJ

【 摘 要 】

Abstract Solid‐state lithium battery promises highly safe electrochemical energy storage. Conductivity of solid electrolyte and compatibility of electrolyte/electrode interface are two keys to dominate the electrochemical performance of all solid‐state battery. By in situ polymerizing poly(ethylene glycol) methyl ether acrylate within self‐supported three‐dimensional porous Li1.3Al0.3Ti1.7(PO4)3 framework, the as‐assembled solid‐state battery employing 4.5 V LiNi0.8Mn0.1Co0.1O2 cathode and Li metal anode demonstrates a high Coulombic efficiency exceeding 99% at room temperature. Solid‐state nuclear magnetic resonance results reveal that Li+ migrates fast along the continuous Li1.3Al0.3Ti1.7(PO4)3 phase and Li1.3Al0.3Ti1.7(PO4)3/polymer interfacial phase to generate a fantastic conductivity of 2.0 × 10−4 S cm−1 at room temperature, which is 56 times higher than that of pristine poly(ethylene glycol) methyl ether acrylate. Meanwhile, the in situ polymerized poly(ethylene glycol) methyl ether acrylate can not only integrate the loose interfacial contact but also protect Li1.3Al0.3Ti1.7(PO4)3 from being reduced by lithium metal. As a consequence of the compatible solid‐solid contact, the interfacial resistance decreases significantly by a factor of 40 times, resolving the notorious interfacial issue effectively. The integrated strategy proposed by this work can thereby guide both the preparation of highly conductive solid electrolyte and compatible interface design to boost practical high energy density all solid‐state lithium metal battery.

【 授权许可】

Unknown