| Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode |
| |
| 作者姓名： | Hao-yang Wang Xue Cheng Xiao-feng Li Ji-min Pan Jun-hua Hu |
| |
| 作者单位： | School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;State Center for International Cooperation on Designer Low-carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, China;Zhengzhou Materials Genome Institute (ZMGI), Xingyang 450100, China;School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;State Center for International Cooperation on Designer Low-carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, China;School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;State Center for International Cooperation on Designer Low-carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, China;School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;State Center for International Cooperation on Designer Low-carbon & Environmental Materials (CDLCEM), Zhengzhou University, Zhengzhou 450001, China;Zhengzhou Materials Genome Institute (ZMGI), Xingyang 450100, China |
| |
| 基金项目： | This work was financially supported by the National Nat-ural 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 U |
| |
| 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 cathode.The enhancement of the conductivity was indicated by the suppressed impedance and polarization.At 1 and 5 C,the cathodes with coupling conductive paths had a more stable cycling performance.The coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 C.In the pristine cathode,the propagation of lattice damaged regions,which consist of high-density edge-dislocation walls,destroyed the bulk integrity of NCA.In addition,the formation of a rock-salt phase on the surface of NCA caused a capacity loss.In 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 retention.Only NiO phase“pitting”occurred.A mechanism based on the synergistic transport of Li ions and electrons was proposed.
|
| 关 键 词： | Ni-rich cathode coupling mechanism dislocation wall coaxial structure cation mixing |
Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode |
| |
| Hao-yang Wang,Xue Cheng,Xiao-feng Li,Ji-min Pan,Jun-hua Hu.Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode[J].International Journal of Minerals,Metallurgy and Materials,2021,28(2):305-316. |
| |
| Authors: | Hao-yang Wang Xue Cheng Xiao-feng Li Ji-min Pan Jun-hua Hu |
| |
| Abstract: | To probe the coupling effect of the electron and Li ion conductivities in Ni-rich layered materials (LiNi0.8Co0.15Al0.05O2, NCA), lithi-um lanthanum titanate (LLTO) nanofiber and carbon-coated LLTO fiber (LLTO@C) materials were introduced to polyvinylidene difluoride in a cathode. The enhancement of the conductivity was indicated by the suppressed impedance and polarization. At 1 and 5 C, the cathodes with coupling conductive paths had a more stable cycling performance. The coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 C. In the pristine cathode, the propagation of lattice damaged regions, which con-sist of high-density edge-dislocation walls, destroyed the bulk integrity of NCA. In addition, the formation of a rock-salt phase on the surface of NCA caused a capacity loss. In 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 res-ulted in a pre-eminent capacity retention. Only NiO phase"pitting"occurred. A mechanism based on the synergistic transport of Li ions and electrons was proposed. |
| |
| Keywords: | Ni-rich cathode coupling mechanism dislocation wall coaxial structure cation mixing |
| 本文献已被 维普 万方数据 等数据库收录！ |
|
