Li1.2Mn0.54Ni0.13Co0.13O2正极材料的Ga2O3包覆改性及电化学性能
Ga2O3 coated modification and electrochemical performance of Li1.2Mn0.54Ni0.13Co0.13O2 cathode material
作者单位E-mail
刘新朋 大连理工大学材料科学与工程学院, 辽宁省能源材料及器件重点实验室, 大连 116024  
赵刘洋 大连理工大学材料科学与工程学院, 辽宁省能源材料及器件重点实验室, 大连 116024  
李泓漪 大连理工大学材料科学与工程学院, 辽宁省能源材料及器件重点实验室, 大连 116024  
陈雅图 陕西煤业化工技术研究院有限责任公司, 西安 710065  
吴爱民 大连理工大学材料科学与工程学院, 辽宁省能源材料及器件重点实验室, 大连 116024 aimin@dlut.edu.cn 
李爱魁 大连理工大学电气工程学院, 大连 116024 liaikui@dlut.edu.cn 
黄昊 大连理工大学材料科学与工程学院, 辽宁省能源材料及器件重点实验室, 大连 116024  
摘要: 首先采用共沉淀方法制备富锂锰基正极材料Li1.2Mn0.54Ni0.13Co0.13O2原始样品(P-LRMO),然后通过简单的湿化学法以及低温煅烧方法对其进行不同含量Ga2O3原位包覆。透射电子显微镜(TEM)以及X射线光电子能谱(XPS)结果表明在P-LRMO表面成功合成了Ga2O3包覆层。电化学测试结果表明:含有3%Ga2O3的改性材料G3-LRMO具有最优的电化学性能,其在0.1C倍率(电流密度为25 mA·g-1)下首圈充放电比容量可以达到270.1 mAh·g-1,在5C倍率下容量仍能保持127.4 mAh·g-1,优于未改性材料的90.7 mAh·g-1,表现出优异的倍率性能。G3-LRMO在1C倍率下循环200圈后仍有190.7 mAh·g-1的容量,容量保持率由未改性前的72.9%提升至85.6%,证明Ga2O3包覆改性能有效提升富锂锰基材料的循环稳定性。并且,G3-LRMO在1C倍率下循环100圈后,电荷转移阻抗(Rct)为107.7 Ω,远低于未改性材料的251.5 Ω,表明Ga2O3包覆层能提高材料的电子传输速率。
关键词: 锂离子电池  富锂锰基正极材料  Ga2O3包覆  电化学性能
基金项目: 陕煤-秦岭基础科学研究五年行动计划资助。
Abstract: To solve the bottleneck problem of lattice oxygen precipitation during the cycling process of lithium-rich manganese-based anode materials and the poor cycling performance due to the lithium-rich phase of the poor conductor of electrons, the ultra-wideband semiconductor material Ga2O3 for its in-situ coating modification was adopted. The purpose of the surface modification is to improve its electronic conductivity to increase the multiplicity of performance, and at the same time, the C2/m space group of the Ga2O3 coating layer can both improve the Li+ migration rate and inhibit the Li+ migration rate. It can also inhibit the lattice oxygen precipitation of Li-rich manganese-based materials. A pristine sample of Li-rich manganese-based cathode materials Li1.2Mn0.54Ni0.13Co0.13O2 (P-LRMO) was prepared by co-precipitation method, and in-situ coated with different contents of Ga2O3 by simple wet-chemical method as well as low-temperature calcination method. The results of transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) showed that the Ga2O3 coating layer was successfully synthesized on the surface of the pristine sample. The results of electrochemical tests showed that the modified material G3-LRMO with mass fraction of 3% Ga2O3 had the best electrochemical performance, which could reach 270.1 mAh·g-1 in the first cycle of the charge-discharge at 0.1C (25 mA·g-1), and still maintained 127.4 mAh·g-1 at 5C, which was better than 90.7 mAh·g-1 of the unmodified material. G3-LRMO still had a capacity of 190.7 mAh·g-1 after 200 cycles at 1C, and the capacity retention rate increased from 72.9% to 85.6%, which proves that the modification of Ga2O3 coating can improve the cycling stability of lithium-rich manganese-based materials. Moreover, the charge transfer impedance (Rct) of the G3-LRMO material was 107.7 Ω after 100 cycles at 1C, which is much lower than that of the unmodified material (251.5 Ω), indicating that the Ga2O3 coating layer can improve the electron transfer rate of the material.
Keywords: lithium-ion battery  lithium-rich manganese-based cathode material  Ga2O3 coating  electrochemical property
投稿时间:2023-12-28 修订日期:2024-03-28
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刘新朋,赵刘洋,李泓漪,陈雅图,吴爱民,李爱魁,黄昊.Li1.2Mn0.54Ni0.13Co0.13O2正极材料的Ga2O3包覆改性及电化学性能[J].无机化学学报,2024,40(6):1105-1113.
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