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

Peng，Xudong1; Liu，Bin1; Chen，Junjie1; Jian，Qinping1; Li，Yiju2; Zhao，Tianshou1,2

2023-08-11

10.1021/acsenergylett.3c01091

ACS Energy Letters   Impact Factor & Quartile

2380-8195

2380-8195

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 LiPF-compatible ether electrolyte is developed to enhance the cycling performance of the mSi anode. Ethylene glycol dibutyl ether (EGDE) with large steric hindrance renders PF-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 after 500 cycles and a high CE of 99.92% in a medium-concentration EGDE-LiPF-based electrolyte. This work provides an effective strategy for extending the cycling life of the mSi anode by designing a new LiPF-ether electrolyte system.

SCI

English

Corresponding

Research Grants Council of the Hong Kong Special Administrative Region, China[R6005-20]

Chemistry ; Electrochemistry ; Energy & Fuels ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Electrochemistry ; Energy & Fuels ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001038299800001

AMER CHEMICAL SOC

2-s2.0-85167883786

Scopus

1.Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Kowloon,Hong Kong SAR,999077,Hong Kong
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Peng，Xudong,Liu，Bin,Chen，Junjie,et al. A Steric-Hindrance-Induced Weakly Solvating Electrolyte Boosting the Cycling Performance of a Micrometer-Sized Silicon Anode[J]. ACS Energy Letters,2023,8(8):3586-3594.

Peng，Xudong,Liu，Bin,Chen，Junjie,Jian，Qinping,Li，Yiju,&Zhao，Tianshou.(2023).A Steric-Hindrance-Induced Weakly Solvating Electrolyte Boosting the Cycling Performance of a Micrometer-Sized Silicon Anode.ACS Energy Letters,8(8),3586-3594.

Peng，Xudong,et al."A Steric-Hindrance-Induced Weakly Solvating Electrolyte Boosting the Cycling Performance of a Micrometer-Sized Silicon Anode".ACS Energy Letters 8.8(2023):3586-3594.