Preparation and performance optimization of high-nickel cathode materials in lithium-ion batteries
High-nickel material has high theoretical capacity,which can be used for promoting the energy density of LIBs.As a type of high-nickel material,LiNi0.8Co0.1Mn0.1O2 has been widely researched.Nevertheless,to pursuit higher energy density,the study on ultra-high-nickel materials(MN＞88%)is necessary.Unfortunately,the high content of Ni not only promotes the theoretical capacity,but also causes negative effects on the structure stability of high-nickel materials,which inhibits the practical application of high-nickel materials.Therefore,the preparation technology of ultra-high-nickel materials is significant.Herein,we prepared ultra-high-nickel materials with Ni content of 88%,90%,92%,94%,and 98%,then the relevant physiochemical properties as well as electrochemical performances were investigated.The effects of the increased Ni content on the capacity and the structural stability of high-nickel materials were verified.Furthermore,the ultra-high-nickel material with Ni content of 90%(Ni90)was selected,and the effect of different sintering temperatures was evaluated.It was found that the particle sizes increased as thewith rising temperature,and 750℃leads led to the best rate and cycling performances of Ni90,in which the particle sizes and the structural stability achieved a balance.Meanwhile,it was revealed that an appropriate sintering temperature was crucial to prepare ultra-high-nickel materials which exhibited both excellent performances and stability.
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