首页|Residual fluoride self-activated effect enabling upgraded utilization of recycled graphite anode

Residual fluoride self-activated effect enabling upgraded utilization of recycled graphite anode

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Recycling graphite anode from spent lithium-ion batteries(SLIBs)is regarded as a crucial approach to promoting sustainable energy storage industry.However,the recycled graphite(RG)generally presents degraded structure and performance.Herein,the residual fluoride self-activated effect is proposed for the upgraded utilization of RG.Simple and low-energy water immersion treatment not only widens the interlayer spacing,but also retains appropriate fluoride on the surface of RG.Theoretical analysis and experiments demonstrate that the residual fluoride can optimize Li+migration and deposition kinet-ics,resulting in better Li+intercalation/deintercalation in the interlayer and more stable Li metal plating/stripping on the surface of RG.As a result,the designed LFP||RG full cells achieve ultrahigh reversibility(～100％Coulombic efficiency),high capacity retention(67％after 200 cycles,0.85 N/P ratio),and com-mendable adaptability(stable cycling without short-circuiting,0.15 N/P ratio).The energy density is improved from 334 Wh kg-1 of 1.1 N/P ratio to 367 Wh kg-1 of 0.85 N/P ratio(total mass based on cath-ode and anode).The exploration of RG by residual fluoride self-activated effect achieves upgraded utiliza-tion beyond fresh commercial graphite and highlights a new strategy for efficient reuse of SLIBs.

Spent lithium-ion batteriesRecycled graphite anodeFluorideSelf-activated effectUpgraded utilization

Shuzhe Yang、Qingqing Gao、Yukun Li、Hongwei Cai、Xiaodan Li、Gaoxing Sun、Shuxin Zhuang、Yujin Tong、Hao Luo、Mi Lu

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School of Materials Science and Engineering,Xiamen University of Technology,Xiamen 361024,Fujian,China

Faculty of Physics,University of Duisburg-Essen,Duisburg D-47057,Germany

National Natural Science Foundation of ChinaIndustry Leading Key Projects of Fujian ProvinceHighlevel talent startup Foundation of Xiamen Institute of Technology

219752122022H0057

2024

10.1016/j.jechem.2024.01.043

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.93(6)
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