期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 14, 页码 16279-16288出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02169
关键词
fast charging; intrinsic carbon defects; distribution of relaxation times; density functional theory calculation; pseudocapacitive
资金
- National Nature Science Foundation of China [52172247, 21875237, 51577175]
- National Key R&D Program of China [2018YFB0905400]
This study demonstrates that thermal treatment of graphite in CO2 is an effective method to improve the fast-charging capability of lithium-ion batteries (LIBs). The activated graphite shows superior rate capability and faster lithium-ion intercalation kinetics, providing a novel strategy for fast-charging LIBs.
The extreme fast-charging capability of lithium-ion batteries (LIBs) is very essential for electric vehicles (EVs). However, currently used graphite anode materials cannot satisfy the requirements of fast charging. Herein, we demonstrate that intrinsic lattice defect engineering based on a thermal treatment of graphite in CO2 is an effective method to improve the fast-charging capability of the graphite anode. The activated graphite (AG) exhibits a superior rate capability of 209 mAh g(-1) at 10 C (in comparison to 15 mAh g(-1 )for the pristine graphite), which is attributed to a pseudocapacitive lithium storage behavior. Furthermore, the full cell LiFePO4 parallel to AG can achieve SOCs of 82% and 96% within 6 and 15 min, respectively. The intrinsic carbon defect introduced by the CO2 treatment succeeds in improving the kinetics of lithium ion intercalation at the rate-determining step during lithiation, which is identified by the distribution of relaxation times (DRT) and density functional theory (DFT) calculations. Therefore, this study provides a novel strategy for fast-charging LIBs. Moreover, this facile method is also suitable for activating other carbon-based materials.
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