Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode

作     者：Hao-yang Wang Xue Cheng Xiao-feng Li Ji-min Pan Jun-hua Hu Hao-yang Wang;Xue Cheng;Xiao-feng Li;Ji-min Pan;Jun-hua Hu

作者机构：School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM)Zhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI)Xingyang 450100China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2021年第28卷第2期

页      面：305-316页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.51571182 and 51001091) the Fundamental Research Program from the Ministry of Science and Technology of China(No.2014CB931704) the Program for Innovative Research Team(in Science and Technology)in University of Henan Province(No.21IRTSTHN003).This work was also partially supported by the Provincial Scientific Research Program of Henan(No.182102310815) 

主　　题：Ni-rich cathode coupling mechanism dislocation wall coaxial structure cation mixing 

摘      要：To probe the coupling effect of the electron and Li ion conductivities in Ni-rich layered materials(LiNi0.8Co0.15Al0.05O2,NCA),lithium lanthanum titanate(LLTO)nanofiber and carbon-coated LLTO fiber(LLTO@C)materials were introduced to polyvinylidene difluoride in a *** enhancement of the conductivity was indicated by the suppressed impedance and *** 1 and 5 C,the cathodes with coupling conductive paths had a more stable cycling *** coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 *** the pristine cathode,the propagation of lattice damaged regions,which consist of high-density edge-dislocation walls,destroyed the bulk integrity of *** addition,the formation of a rock-salt phase on the surface of NCA caused a capacity *** contrast,in the LLTO@C modified cathode,although the formation of dislocation-driven atomic lattice broken regions and cation mixing occurred,they were limited to a scale of several atoms,which retarded the generation of the rock-salt phase and resulted in a pre-eminent capacity *** NiO phase“pittingoccurred.A mechanism based on the synergistic transport of Li ions and electrons was proposed.