Impact of Excess Li on the Structural and Electrochemical Properties of Li1+x(NizCo1−2zMnz)1−xO2 Materials for Lithium-Ion Batteries

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LiNizCo1−2zMnzO2 materials have been investigated as promising positive electrode materials for lithium-ion secondary batteries, in which cobalt ions are simultaneously substituted with nickel and manganese ions while preserving the α-NaFeO2 structure. The materials can be regarded as solid solutions of LiNiO2, LiCoO2, and LiMnO2, in which the transition metals are trivalent in all three materials, whereas the transition metals found in LiNizCo1−2zMnzO2 materials are Ni2+, Co3+, and Mn4+. The electrochemical lithium deintercalation-intercalation processes of these materials are mainly accompanied by the Ni2+/4+ and Co3+/4+ redox reactions, whereas Mn4+ ions do not participate in the electrochemical redox reaction. Recently, Li+ substitution for transition metals in Li1+x(NizCo1−2zMnz)1−xO2, so called overlithiation, has been introduced to improve their structural integrity and electrochemical performances.In this paper, we introduce the overlithiation effects on the structural and electrochemical properties of the Li1+x(NizCo1−2zMnz)1−xO2 materials having diffrrent x- and z-values in the ranges from x=0.00 to x=0.17 and z=0.00 to z=0.50.
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