This technology involves adjusting the stoichiometric composition of lithium manganese spinel structures by maintaining manganese content while increasing lithium content and regulating transition metal (e.g., Ni) levels to maintain charge neutrality. By doing so, it suppresses oxygen deficiency to prevent the formation of Mn3+, induces local disordering within the structure, and forms a layered (Li2MnO3) composite to enhance electrochemical performance and cycle life.
Conventional spinel-type lithium manganese oxide (LMO) suffers from capacity degradation due to manganese ion dissolution into the electrolyte during high-temperature storage, as well as inherently low capacity. Furthermore, existing ordered structures are prone to dissolution issues caused by Mn3+ content, and alternative methods like layered-spinel composite synthesis (e.g., co-precipitation) are limited by complex processes and high costs.
This technology utilizes a solid-state reaction method, in which lithium, manganese, and transition metal precursors are mixed and calcined at 800–900°C, followed by natural cooling, re-pelletization, and re-annealing at 600–700°C for 48–72 hours. This approach improves the performance of lithium secondary battery cathode materials while increasing their commercial viability.
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