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| Preparation of the spherical Si/carbon gel @ void @ C and research on electrochemical properties of the composite materials |
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Received:April 19, 2021
Revised:April 22, 2021
Accepted:April 26, 2021
Published Online:June 29, 2021
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| DOI： |
| KeyWord:lithium-ion batteries; Si/C anode; reversible capacity; rate capability |
| Author | Institution |
| LIU Jun-hao |
Institute of Process Engineering,Chinese Academy of Sciences |
| YU Kun-xiang |
Institute of Process Engineering,Chinese Academy of Sciences |
| LU Ji-jun |
Institute of Process Engineering,Chinese Academy of Sciences |
| WANG Zhi |
Institute of Process Engineering,Chinese Academy of Sciences |
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| Abstract: |
| The commercial lithium-ion battery anodes are mainly composed of graphite, but its theoretical specific capacity is low, which far cannot satisfy the future market demand for high energy density lithium-ion batteries. Silicon (Si) has high theoretical capacity, appropriate electrode potential and the advantages of abundant, and is expected to replace graphite as a new generation of lithium-ion battery anode materials. However, Si as the cathode material can produce huge volume expansion in the process of reaction with lithium, and intrinsic conductivity is low, which limits the practical application. In this work, the L-lysine is used to improve the Fe3+ complexation, and a new structure of Si/carbon gel@void@C is successfully prepared. Results show that the new anode material show a prominent electrochemical performance (a high initial charge/discharge capacity of 1828.8/1508.3 mAh/g, a high ICE of 82.47% and a stable capacity of 1201.3 mAh/g after 300 cycles). |
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