Suppressing the Impedance Rise of LiNi0.8Co0.2O2/Graphite Cells by Al, Ti and Mg Doping |
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| Authors: | Chen Chun-hua Xie Song LIU Jun Amine K |
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| Affiliation: | Dept.Mat.Sci.& Eng., University of Science and Technology of China, Hefei, Anhui 230026, China;Electrochem.Technol.Progy., Chem.Technol.Div., ANL., Argonne, Illinois 60439, USA;Dept.Mat.Sci.& Eng., University of Science and Technology of China, Hefei, Anhui 230026, China;Electrochem.Technol.Progy., Chem.Technol.Div., ANL., Argonne, Illinois 60439, USA |
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| Abstract: | The research on utilizing lithium-ion batteries with LiNi0.8Co0.2O2-based cathode for hybrid electric vehicles is intensively underway in several national laboratories of US Department of Energy.The impedance of LiNi0.8Co0.2O2/graphite lithium-ion cells is observed to experience a substantial rise during accelerated calendar life storage, due mainly to the significant increase of the interracial resistance on the cathode side. By means of electrochemical measurements and AC impedance spectroscopy, it is found that doping the LiNi0.8Co0.2O2 cathode with small amount of Al, Ti and Mg can effectively suppress this impedance rise. Possible mitigation of oxidizing ability of Ni^4 due to Al, Ti and Mg doping is proposed to achieve this impedance stabilization. |
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| Keywords: | rechargeable batteries doping cathode impedance |
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