Cycling Performance and Solid-Electrolyte-Interphase Synergic Formation of Silicon Nanoparticles in the Concentrated Electrolyte with Additives

Authors

Zeng-hua CHANG, 1. National Power Battery Innovation Center , GRINM Group Corporation Limited, Beijing 100088, China;2. China Automotive Battery Research Institute Co., Ltd., Beijing 100088, China;
Fu-juan HAN, 1. National Power Battery Innovation Center , GRINM Group Corporation Limited, Beijing 100088, China;2. China Automotive Battery Research Institute Co., Ltd., Beijing 100088, China;3. General Research Institute for Nonferrous Metals, Beijing 100088, China;
Xi-xin YANG, 1. National Power Battery Innovation Center , GRINM Group Corporation Limited, Beijing 100088, China;2. China Automotive Battery Research Institute Co., Ltd., Beijing 100088, China;3. General Research Institute for Nonferrous Metals, Beijing 100088, China;
Jian-tao WANG, 1. National Power Battery Innovation Center , GRINM Group Corporation Limited, Beijing 100088, China;2. China Automotive Battery Research Institute Co., Ltd., Beijing 100088, China;3. General Research Institute for Nonferrous Metals, Beijing 100088, China;
Shi-gang LU, 1. National Power Battery Innovation Center , GRINM Group Corporation Limited, Beijing 100088, China;2. China Automotive Battery Research Institute Co., Ltd., Beijing 100088, China;3. General Research Institute for Nonferrous Metals, Beijing 100088, China;Follow

Corresponding Author

Shi-gang LU(lusg8867@163.com)

Abstract

In this paper, the effects of additives on the cycling performance of silicon nanoparticles in LiFSI-(PC)₃ based concentrated electrolytes were systematically studied. The structures of silicon nanoparticle electrodes and the evolution of solid-electrolyte-interphase were characterized by scanning electron microscopy (SEM）, attenuated total reflection Flourier transformed infrared spectroscopy (ATR-FTIR） and X-ray photoelectron spectroscopy (XPS). The results indicated that the additives can efficiently improve the cycling performance of silicon nanoparticle electrodes. In LiFSI-(PC)₃ concentrated electrolyte, the capacity became 574.8 mAh·g^-1 after 300 cycles with the initial capacity of 3296.1 mAh·g^-1. In contrast, the 3% LiDFOB, 3% FEC and 3% TMSB-containing systems reached 1142.9, 1863.6 and 1852.2 mAh·g^-1 after 300 cycles, respectively. The comprehensive analysis indicates that the reduction of LiFSI takes priority over PC on the surface of silicon nanoparticles in LiFSI-(PC)₃ concentrated electrolyte, and the SEI film is composed of an inner layer dominated by inorganic products and an outer layer dominated by organic products. While in the concentrated electrolyte containing additives, the additives and LiFSI participate in the formation of SEI inner layer synergistically, and the SEI inner layer can suppress the reduction of PC which contribute to the formation of SEI outer layer. The SEI film formed on this mechanism could suppress the excessive growth of the SEI film, mitigate the pulverization of silicon nanoparticles, and enhance the structure stability of the silicon nanoparticle electrode, thus, the silicon nanoparticle electrodes exhibited better cycling performance.

Graphical Abstract

Keywords

lithium-ion batteries, silicon nanoparticle electrode, concentrated electrolyte, additive

DOI Link

https://doi.org/10.13208/j.electrochem.200645

Publication Date

2020-10-28

Online Available Date

2020-08-19

Revised Date

2020-07-21

Received Date

2020-06-30

Recommended Citation

Zeng-hua CHANG, Fu-juan HAN, Xi-xin YANG, Jian-tao WANG, Shi-gang LU. Cycling Performance and Solid-Electrolyte-Interphase Synergic Formation of Silicon Nanoparticles in the Concentrated Electrolyte with Additives[J]. Journal of Electrochemistry, 2020 , 26(5): 759-771.
DOI: 10.13208/j.electrochem.200645
Available at: https://jelectrochem.xmu.edu.cn/journal/vol26/iss5/12