Lithium Nickelate Particles Coating for Cycle Stability

The patent applies composite materials by forming a coating layer on the lithium nickelate particles that contains both an aluminum-containing compound (Al2O3, Al(OH)3, or aluminum carbonate) and a lithium-containing compound (Li2CO3, LiOH, or Li2O). This composite coating structure prevents ion elution and maintains structural stability during charge/discharge cycles, thereby improving repeated cycle characteristics at high voltage while preserving the high output characteristics of the lithium nickelate core material.

The patent applies local quality by creating a coating layer with specific local composition and structure on the surface of the lithium nickelate particles. The coating layer has different chemical properties than the core material, with aluminum and lithium compounds concentrated at the surface to prevent ion elution locally, while the interior lithium nickelate maintains its high output characteristics. This localized modification resolves the contradiction between power and reliability.

The patent uses composite materials in the coating layer containing both aluminum-containing compounds and lithium-containing compounds. This composite structure suppresses gas generation during high-temperature storage by preventing constitutional ion elution and stabilizing the particle structure, while the lithium nickelate core maintains its high output characteristics.

The patent converts the potentially harmful effect of high-temperature storage (which causes gas generation through ion elution) into a beneficial outcome by using the coating layer to prevent ion loss. The aluminum-containing compound forms a stable surface structure that resists thermal degradation, turning the high-temperature condition from harmful to manageable, while preserving the high output characteristics.

The patent applies preliminary action by conducting the reaction in a sealed atmosphere-pressure container that maintains high pressure and temperature conditions throughout the reaction process. This preliminary setup ensures complete reaction between raw materials, preventing the formation of unreacted impurities such as lithium carbonate and lithium hydroxide, while keeping the process economically viable through a single-step synthesis method.

The patent applies parameter changes by conducting the reaction under elevated pressure and temperature conditions in a sealed container. These changed parameters (higher pressure and temperature) ensure complete reaction and high purity product formation, while the sealed container design maintains ease of manufacture by enabling a single-step process that produces particles with controlled size distribution and minimal impurities.

The patent applies preliminary action by pre-setting the sealed atmosphere-pressure container conditions before initiating the reaction. The high pressure and temperature environment is established beforehand to ensure complete reaction kinetics, allowing the synthesis to proceed to completion in a single step without requiring additional processing stages, thereby improving productivity while maintaining ease of manufacture.

The patent applies parameter changes by utilizing elevated pressure and temperature conditions in the sealed container to accelerate and complete the reaction. These parameter changes ensure that the reaction goes to completion, maximizing productivity by eliminating unreacted materials and reducing the need for reprocessing, while the sealed container design keeps the manufacturing process simple and cost-effective.