Fusion Bonding Technique for Solvent‐Free Fabrication of All‐Solid‐State Battery with Ultrathin Sulfide Electrolyte

Author:

Hu Lei123,Ren Yulang1234,Wang Ciwei1234,Li Jiedong1,Wang Zehai1,Sun Fu123,Ju Jiangwei123,Ma Jun123,Han Pengxian123,Dong Shanmu1234ORCID,Cui Guanglei1234ORCID

Affiliation:

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

2. Shandong Energy Institute Qingdao 266101 P. R. China

3. Qingdao New Energy Shandong Laboratory Qingdao 266101 P. R. China

4. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China

Abstract

AbstractFor preparing next‐generation sulfide all‐solid‐state batteries (ASSBs), the solvent‐free manufacturing process has huge potential for the advantages of economic, thick electrode, and avoidance of organic solvents. However, the dominating solvent‐free process is based on the fibrillation of polytetrafluoroethylene, suffering from poor mechanical property and electrochemical instability. Herein, a continuously solvent‐free paradigm of fusion bonding technique is developed. A percolation network of thermoplastic polyamide (TPA) binder with low viscosity in viscous state is constructed with Li6PS5Cl (LPSC) by thermocompression (≤5 MPa), facilitating the formation of ultrathin LPSC film (≤25 µm). This composite sulfide film (CSF) exhibits excellent mechanical properties, ionic conductivity (2.1 mS cm−1), and unique stress‐dissipation to promote interface stabilization. Thick LiNi0.83Co0.11Mn0.06O2 cathode can be prepared by this solvent‐free method and tightly adhered to CSF by interfacial fusion of TPA for integrated battery. This integrated ASSB shows high‐energy‐density feasibility (>2.5 mAh cm−2 after 1400 cycles of 9200 h and run for more than 10 000 h), and energy density of 390 Wh kg−1 and 1020 Wh L−1. More specially, high‐voltage bipolar cell (≥8.5 V) and bulk‐type pouch cell (326 Wh kg−1) are facilely assembled with good cycling performance. This work inspires commercialization of ASSBs by a solvent‐free method and provides beneficial guiding for stable batteries.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Publisher

Wiley

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