采用包覆和掺杂同步改性策略修复废旧LiFePO<sub>4</sub>制备高性能正极材料

童汇; 李毅; 毛高强; 王朝磊; 喻万景; 刘勇; 刘牡丹

doi:10.1007/s12613-022-2577-2

Volume 30 Issue 6

Jun. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(6): 1162-1170

Hui Tong, Yi Li, Gaoqiang Mao, Chaolei Wang, Wanjing Yu, Yong Liu, and Mudan Liu, Regeneration of spent LiFePO₄ as a high-performance cathode material by a simultaneous coating and doping strategy, Int. J. Miner. Metall. Mater., 30(2023), No. 6, pp. 1162-1170. https://doi.org/10.1007/s12613-022-2577-2

Cite this article as:

Hui Tong, Yi Li, Gaoqiang Mao, Chaolei Wang, Wanjing Yu, Yong Liu, and Mudan Liu, Regeneration of spent LiFePO4 as a high-performance cathode material by a simultaneous coating and doping strategy, Int. J. Miner. Metall. Mater., 30(2023), No. 6, pp. 1162-1170. https://doi.org/10.1007/s12613-022-2577-2

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研究论文

采用包覆和掺杂同步改性策略修复废旧LiFePO₄制备高性能正极材料

1)
中南大学冶金与环境学院，长沙 410083，中国
2)
广东省矿产资源开发和综合利用重点实验室，广州510560，中国
3)
有色金属资源循环利用国家地方联合工程研究中心，长沙 410083，中国
4)
中南大学先进电池材料教育部工程研究中心，长沙 410083，中国
5)
广东省科学院资源利用与稀土开发研究所，广州510560，中国

通讯作者:
喻万景 E-mail: yuwj2005@163.com

文章亮点

（1）系统研究了短流程固相烧结法修复废旧LiFePO₄正极材料。

（2）提出了补锂过程中碳包覆与镁离子掺杂同步改性的策略。

（3）总结了修复再生LiFePO₄正极材料电化学性能提升的机理。

中文摘要

随着新能源汽车的日渐普及导致动力电池的需求量和报废量呈现爆发式增长，对废旧电池正极材料进行修复再生利用具有重要的环保和经济意义。通过传统浸出方式回收正极材料中有价金属能够实现正极材料的资源化利用，但存在流程复杂、经济效益低、污染严重等问题；而仅通过补锂的方式修复得到的再生正极材料存在循环稳定性差的缺陷。本研究通过固相烧结法补充废旧LiFePO₄中损失的锂离子，并加入葡萄糖促进 Fe³⁺还原的同时在LiFePO₄表面形成碳包覆层。此外，在补锂过程中加入Mg²⁺实现修复再生和掺杂改性同步进行。结果表明，再生过程中同步掺入Mg²⁺可以明显提高晶体结构稳定性以及锂离子扩散系数。再生LiFePO₄正极材料表现出优异的电化学性能。在1 C倍率下，Mg-RLFP的首次放电容量为131.8 mAh⋅g⁻¹，200圈和400圈容量保持率分别达到98.8%和92.2%；在0.1 C和10 C的倍率下，Mg-RLFP的放电容量分别为142.9·mAh⋅g⁻¹和95.5 mAh⋅g⁻¹。研究结果表明，补锂过程中采用碳包覆与镁离子掺杂同步改性的策略能够有效地修复废旧LiFePO₄正极材料。

关键词:

Research Article

Regeneration of spent LiFePO₄ as a high-performance cathode material by a simultaneous coating and doping strategy

+ Author Affiliations

1)
School of Metallurgy and Environment, Central South University, Changsha 410083, China
2)
Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources, Guangzhou 510560, China
3)
National & Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling, Changsha 410083, China
4)
Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha 410083, China
5)
Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou 510560, China

Corresponding author:
Wanjing Yu E-mail: yuwj2005@163.com
Received: 10 August 2022; Revised: 3 November 2022; Accepted: 24 November 2022; Available online: 25 November 2022

Abstract

Abstract

With the number of decommissioned electric vehicles increasing annually, a large amount of discarded power battery cathode material is in urgent need of treatment. However, common leaching methods for recovering metal salts are economically inefficient and polluting. Meanwhile, the recycled material obtained by lithium remediation alone has limited performance in cycling stability. Herein, a short method of solid-phase reduction is developed to recover spent LiFePO₄ by simultaneously introducing Mg²⁺ ions for hetero-atom doping. Issues of particle agglomeration, carbon layer breakage, lithium loss, and Fe³⁺ defects in spent LiFePO₄ are also addressed. Results show that Mg²⁺ addition during regeneration can remarkably enhance the crystal structure stability and improve the Li⁺ diffusion coefficient. The regenerated LiFePO₄ exhibits significantly improved electrochemical performance with a specific discharge capacity of 143.2 mAh·g⁻¹ at 0.2 C, and its capacity retention is extremely increased from 37.9% to 98.5% over 200 cycles at 1 C. Especially, its discharge capacity can reach 95.5 mAh·g⁻¹ at 10 C, which is higher than that of spent LiFePO₄ (55.9 mAh·g⁻¹). All these results show that the proposed regeneration strategy of simultaneous carbon coating and Mg²⁺ doping is suitable for the efficient treatment of spent LiFePO₄.
- spent LiFePO₄;
- solid-phase reduction;
- repair and regeneration;
- cathode materials;
- lithium-ion batteries

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采用包覆和掺杂同步改性策略修复废旧LiFePO₄制备高性能正极材料

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Regeneration of spent LiFePO₄ as a high-performance cathode material by a simultaneous coating and doping strategy

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采用包覆和掺杂同步改性策略修复废旧LiFePO4制备高性能正极材料

文章亮点

中文摘要

Regeneration of spent LiFePO4 as a high-performance cathode material by a simultaneous coating and doping strategy

Abstract

References

数据统计

Catalog

采用包覆和掺杂同步改性策略修复废旧LiFePO₄制备高性能正极材料

Regeneration of spent LiFePO₄ as a high-performance cathode material by a simultaneous coating and doping strategy