Статья

A monofluoride ether-based electrolyte solution for fast-charging and low-temperature non-aqueous lithium metal batteries

Guangzhao ZhangDepartment of Materials Science & Engineering, School of Innovation and Entrepreneurship, Southern University of Science and Technology, Southern University of Science and Technology of China, Shenzhen, 518055, ChinaJian ChangDepartment of Materials Science & Engineering, School of Innovation and Entrepreneurship, Southern University of Science and Technology, Southern University of Science and Technology of China, Shenzhen, 518055, ChinaLiguang WangCollege of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, ChinaJiawei LiSchool of Materials Science and Engineering, China University of Petroleum (East China) Qingdao, Qingdao, 266580, ChinaChaoyang WangResearch Institute of Materials Science, South China University of Technology, Guangzhou, 510640, ChinaRuo WangDepartment of Materials Science & Engineering, School of Innovation and Entrepreneurship, Southern University of Science and Technology, Southern University of Science and Technology of China, Shenzhen, 518055, ChinaGuoli ShiDepartment of Materials Science & Engineering, School of Innovation and Entrepreneurship, Southern University of Science and Technology, Southern University of Science and Technology of China, Shenzhen, 518055, ChinaKai YuDepartment of Materials Science & Engineering, School of Innovation and Entrepreneurship, Southern University of Science and Technology, Southern University of Science and Technology of China, Shenzhen, 518055, ChinaWei HuangNational Center for Applied Mathematics Shenzhen (NCAMS, Digital Economy Research Center-DeFin) and College of Business, Southern University of Science and Technology, Shenzhen, 518055, ChinaHonghe ZhengCollege of Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu, 215006, ChinaTianpin WuCollege of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China. [email protected]Yonghong DengDepartment of Materials Science & Engineering, School of Innovation and Entrepreneurship, Southern University of Science and Technology, Southern University of Science and Technology of China, Shenzhen, 518055, China. [email protected]Jun LüCollege of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China. [email protected]

2023en

ABI

Аннотация

Abstract The electrochemical stability window of the electrolyte solution limits the energy content of non-aqueous lithium metal batteries. In particular, although electrolytes comprising fluorinated solvents show good oxidation stability against high-voltage positive electrode active materials such as LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811), the ionic conductivity is adversely affected and, thus, the battery cycling performance at high current rates and low temperatures. To address these issues, here we report the design and synthesis of a monofluoride ether as an electrolyte solvent with Li-F and Li-O tridentate coordination chemistries. The monofluoro substituent (-CH 2 F) in the solvent molecule, differently from the difluoro (-CHF 2 ) and trifluoro (-CF 3 ) counterparts, improves the electrolyte ionic conductivity without narrowing the oxidation stability. Indeed, the electrolyte solution with the monofluoride ether solvent demonstrates good compatibility with positive and negative electrodes in a wide range of temperatures (i.e., from −60 °C to +60 °C) and at high charge/discharge rates (e.g., at 17.5 mA cm −2 ). Using this electrolyte solution, we assemble and test a 320 mAh Li||NCM811 multi-layer pouch cell, which delivers a specific energy of 426 Wh kg −1 (based on the weight of the entire cell) and capacity retention of 80% after 200 cycles at 0.8/8 mA cm −2 charge/discharge rate and 30 °C.

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Идентификаторы

DOI: 10.1038/s41467-023-36793-6

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar