Electrochemical method for impurity removal of graphite anode in spent ternary lithium-ion batteries

ZHANG Rui; TIAN Yong; ZHANG Wei-li; SONG Jia-yin; MIN Jie; PANG Bo; CHEN Jian-jun

doi:10.1016/S1872-5805(24)60843-7

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ZHANG Rui, TIAN Yong, ZHANG Wei-li, SONG Jia-yin, MIN Jie, PANG Bo, CHEN Jian-jun. Electrochemical method for impurity removal of graphite anode in spent ternary lithium-ion batteries. New Carbon Mater.. doi: 10.1016/S1872-5805(24)60843-7

Citation:

ZHANG Rui, TIAN Yong, ZHANG Wei-li, SONG Jia-yin, MIN Jie, PANG Bo, CHEN Jian-jun. Electrochemical method for impurity removal of graphite anode in spent ternary lithium-ion batteries. New Carbon Mater.. doi: 10.1016/S1872-5805(24)60843-7

Citation:

ZHANG Rui, TIAN Yong, ZHANG Wei-li, SONG Jia-yin, MIN Jie, PANG Bo, CHEN Jian-jun. Electrochemical method for impurity removal of graphite anode in spent ternary lithium-ion batteries. New Carbon Mater.. doi: 10.1016/S1872-5805(24)60843-7

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Electrochemical method for impurity removal of graphite anode in spent ternary lithium-ion batteries

doi: 10.1016/S1872-5805(24)60843-7

ZHANG Rui^{1, 2
,},
TIAN Yong¹,
ZHANG Wei-li¹,
SONG Jia-yin²,
MIN Jie¹,
PANG Bo¹,
CHEN Jian-jun^{1, 2
,
,}

1.
Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057 China
2.
Shenzhen Tsingtech Lithium Technology Co., Ltd, Shenzhen 518057 China

More Information

Author Bio:
ZHANG Rui. E-mail: zrhitsz22334@163.com
Corresponding author: CHEN Jian-jun，professor. E-mail: chenjj08@126.com
Received Date: 2023-10-27
Accepted Date: 2024-02-02
Rev Recd Date: 2024-01-31

Available Online: 2024-02-21

Abstract

Abstract

The application of lithium-ion batteries (LIBs) is becoming increasingly widespread, and a large number of LIBs are entering the peak period of retirement. The recycling and comprehensive utilization of spent LIBs has attracted high attention from countries around the world. Due to the graphite anode in spent LIBs, it’s recycling does not require high-temperature graphitization, the unchanged layered structure of and only focuses on the removal of internal impurities. In this study, we innovatively used electrochemical treatment to deeply remove internal metal impurities after heat treatment, ultrasonic separation and acid leaching of spent graphite. By comparing and analyzing the graphite in different recovery stages, it is found that the presence of organic impurities in graphite will seriously affect the electrochemical performance. The presence of trace inorganic impurities such as Cu and Fe has little effect on the initial discharge specific capacity, but it will reduce the cycle stability of graphite. The content of main metal impurities in the final recycled graphite is less than 20 mg/kg. The discharge specific capacity reaches 358.7 mAh/g at 0.1 C, and the capacity remains 95.85% after 150 cycles. Compared with the reported methods for recycling spent graphite, this method can deeply remove impurities inside the graphite, solve the current problems of high acid and alkali consumption, incomplete impurity removal and high energy consumption. The recycled graphite anode shows good electrochemical performance, which provides, a new recycling and regeneration path for spent LIBs graphite anode.
- Battery recycling,
- Spent graphite,
- Electrochemical impurity removal,
- Electrochemical performance,
- Effect of impurities

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References(26)

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