铝基化合物改性富锂锰三元正极材料的高温性能  

High temperature performances of lithium-rich manganese ternary cathode material modified by aluminum based compounds

作　　者：王桢 李俐[3] 张俊亭 邓晓龙 刘永锋 WANG Zhen;LI Li;ZHANG Jun‑Ting;DENG Xiao‑Long;LIU Yong‑Feng(Postdoctoral Research Workstation of Zhejiang Geely Holding Group Co.,Ltd.,Hangzhou 310000,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310000,China;Shandong Si‑Nano Materials Technology Co.Ltd.,Zibo,Shandong 255000,China)

机构地区：[1]浙江吉利控股集团有限公司博士后科研工作站,杭州310000 [2]浙江大学材料科学与工程学院,杭州310000 [3]山东硅纳新材料科技有限公司,淄博255000

出　　处：《无机化学学报》2023年第6期1053-1060,共8页Chinese Journal of Inorganic Chemistry

基　　金：山东省自然科学基金(No.ZR2022QE244)资助。

摘　　要：通过多相复合分别制备了Al_(2)O_(3)、AlF_(3)、AlPO_(4)改性的富锂锰三元正极材料(Li_(1.2)Ni_(0.133)Co_(0.133)Mn_(0.533)O_(2),LR)。采用X射线光电子能谱、透射电镜和电化学交流阻抗等对复合材料的成分结构、高温下的电化学性能及作用机理进行了研究。结果表明:Al_(2)O_(3)改性的Li_(1.2)Ni_(0.133)Co_(0.133)Mn_(0.533)O_(2)(LRO)性能最佳,包覆层薄且均匀;在50℃高温下,LRO的200圈平均放电比容量为189.5mAh·g^(-1),容量保持率为81.5%,比原材料分别提高61.5 mAh·g^(-1)、49.8%;100圈循环后的电荷转移电阻为443.1Ω,仅为原材料一半,表现出较优的电化学性能。To solve the problem of the electrochemical performance of lithium-rich manganese ternary cathode material(Li_(1.2)Ni_(0.133)Co_(0.133)Mn_(0.533)O_(2),LR)with poor cyclic stability at high temperatures,the materials modified with Al_(2)O_(3),AlF_(3),and AlPO_(4)were prepared by simple multi-phase recombination.X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),and electrochemical impedance spectroscopy(EIS)were used to study the composition structure,electrochemical properties,and mechanism of the composite materials at high temperatures.The results showed that the Li_(1.2)Ni_(0.133)Co_(0.133)Mn_(0.533)O_(2)modified with Al_(2)O_(3)(LRO)had the best properties and the coating layer was thin and uniform.At 50℃,the average discharge capacity of LRO was 189.5 mAh·g^(-1)for 200 cycles,and the capacity retention rate was 81.5%,which was 61.5 mAh·g^(-1)and 49.8%higher than that of raw materials,respectively.The charge transfer resistance of LRO after 100 cycles was 443.1Ω,only half of the raw materials,showing excellent electrochemical performance.

关 键 词：富锂锰三元正极材料 氧化铝 高温性能 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]