Abstract
Layered lithium first-row transition metal oxide is widely used as cathode materials in lithium-ion batteries and promises a high theoretical capacity. However, only 70% of its theoretical capacity is utilized in practice due to irreversible changes in the structure as well as the microstructure of the electrode when cycled to high voltages. Previous studies have identified intergranular cracking as a dominant cause of the long-term capacity fading induced by the anisotropic volume change upon lithium de-intercalation. Such anisotropic volume change can be mitigated by preventing the layer collapse at high voltages. One approach to such an effect is through cation substitution. This work presents a structure-function relationship study to evaluate the efficacy of such an approach.
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