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Effects of al and co doping on the structural stability and high temperature cycling performance of LiNi_(0.5)Mn_(1.5)O_(4) spinel cathode materials

引用

Chinese Journal of Chemical Engineering 2023年第9期61卷 201-209页

作者： Jianfeng Cheng Meixuan Li Yutong Wang Jiexiang Li Jiawei Wen Chunxia Wang Guoyong Huang college of New Energy and Materials China University of Petroleum(Beijing)Beijing 102249China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum(Beijing)Beijing 102249China

The poor structural stability and capacity retention of the high-voltage spinel-type LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)limits their further ***,al and co were doped in LNMO materials for a more stable structure and *** LNMO,LiNi_(0.45)al_(0.05)Mn_(1.5)O_(4)(LNAMO)and LiNi_(0.45)co_(0.05)Mn_(1.5)O_(4)(LNCMO)were synthesized by calcination at 900℃ for 8 h,which was called as solid-phase method and applied universally in ***,FT-IR and CV test results showed the synthesized samples have cation disordering Fd-3m space group ***,the incorporation of al and co increased the cation disordering of LNMO,thereby increasing the transfer rate of Li+.The SEM results showed that the doped samples performed more regular and *** EDS elemental analysis confirmed the uniform distribution of each metal element in the ***,the doped samples showed better electrochemical properties than undoped *** LNAMO and LNCMO samples were discharged with specific capacities of 116.3 mA·h·g^(-1)and 122.8 mA·h·g^(-1)at 1 C charge/discharge rate with good capacity retention of 95.8% and 94.8% after 200 cycles at room temperature,*** capacity fading phenomenon of the doped samples at 50℃ and 1 C rate was significantly ***,cations doping also enhanced the rate performance,especially for the LNCMO,the discharge specific capacity of 117.9 mA·h·g^(-1)can be obtained at a rate of 5 C.

关键词： High voltage spinel al/co doping High temperature cycling stability

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