Статья

A Steric-Hindrance-Induced Weakly Solvating Electrolyte Boosting the Cycling Performance of a Micrometer-Sized Silicon Anode

Xudong PengDepartment of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999077, People’s Republic of ChinaBin LiuDepartment of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999077, People’s Republic of ChinaJunjie ChenDepartment of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999077, People’s Republic of ChinaQinping JianDepartment of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999077, People’s Republic of ChinaYiju LiDepartment of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of ChinaTianshou ZhaoDepartment of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999077, People’s Republic of China

2023en

ABI

Аннотация

The application of micrometer-sized silicon (mSi) is challenging due to the severe volume change during cycling, resulting in serious pulverization of the mSi and detachment of active materials from the current collector and consequently causing a capacity loss. Here, a new LiPF6-compatible ether electrolyte is developed to enhance the cycling performance of the mSi anode. Ethylene glycol dibutyl ether (EGDE) with large steric hindrance renders PF6–-rich solvation complexes in the electrolyte, which are favorable for rapidly passivating the mSi anode surface and forming a LiF-rich, thin, and stratified solid electrolyte interphase (SEI). As a result, the mSi anode displays a high capacity retention of 1901 mAh g–1 after 500 cycles and a high CE of 99.92% in a medium-concentration EGDE-LiPF6-based electrolyte. This work provides an effective strategy for extending the cycling life of the mSi anode by designing a new LiPF6-ether electrolyte system.

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Идентификаторы

DOI: 10.1021/acsenergylett.3c01091

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar