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Study on synergistic modification to improve structural stability of ternary cathode material LiNi0.9Co0.05Mn0.05O2
Received date: 2024-08-06
Online published: 2024-10-16
Lithium-ion batteries（LIBs） play a crucial role in electric vehicles（EVs），high nickel layered metal oxides （LiNi x Co y Mn1-x-y O2，NCM，x≥0.8） are one of the most important types of cathode materials for lithium-ion batteries.In order to improve the driving range of electric vehicles，increasing the nickel content in NCM cathode material can improve the actual specific discharge capacity of electric vehicles.However，high nickel content leads to structural instability of the cathode material and poor capacity retention ability.The strategy of doping exogenous elements can solve the above problems well.Using the method of solid phase sintering，a strategy of suppressing the volume shrinkage caused by lattice deformation by doping with high price W atoms was studied，while doping inactive Ti atoms to stabilize the rigid frame.This strategy significantly inhibited the concentration of stress，thereby stabilizing the structure，preventing the formation of micro-cracks，and improving electrochemical performance.Due to its unique structural characteristics，the initial capacity at 0.1C was 221.4 mA·h/g，the specific discharge capacity after 200 cycles at 0.5C was 162.9 mA·h/g，and the capacity retention rate was 74.6%.This study provided a new idea for the design of high performance layered cathode materials.
ZHANG Longhua , ZHANG Zhichao . Study on synergistic modification to improve structural stability of ternary cathode material LiNi0.9Co0.05Mn0.05O2[J]. Inorganic Chemicals Industry, 2025 , 57(9) : 82 -87 . DOI: 10.19964/j.issn.1006-4990.2024-0439
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