Surface modification technology of cathode material for lithium ion battery

Abstract

The invention belongs to the field of inorganic nonmetallic materials and relates to a surface modification technology of a cathode material for a lithium ion battery. The surface modification technology comprises the following steps: the cathode material for the lithium ion battery, mainly including ternary materials of lithium cobalt oxide, lithium manganese oxide, lithium nickel-cobalt-manganese oxide, nickel and cobalt aluminate, layered rich lithium high manganese and other solid solution materials, is sintered at a high temperature, and put into an organic solvent to be fully stirred; then a solid-liquid mixture is filtered; a filter cake is heated to obtain a final product. The surface modification technology of the anode material for the lithium ion battery has the benefits that through the cathode material for the lithium ion battery modified by the surface modification technology, the pH value and the impurity lithium content of the material can be effectively reduced, and the high temperature cycle and the storage performance of the material can be improved, so that the material has excellent cycle performance and high-temperature performance; the surface modification technology can be widely used in the cathode material for the lithium ion battery and particularly is applied to a power type lithium ion battery.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a surface modification technology of lithium-ion battery cathode materials. Background technique [0002] In the early 1980s, American scholar J.B.Goodenough and others first discovered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 o 4 ) can be used as a material for deintercalating lithium ions, and related patents have been applied for. Among them, lithium cobaltate was successfully used in the first commercialized lithium-ion battery for small electronic products as a positive electrode material by Sony Corporation of Japan in the early 1990s due to its excellent electrochemical performance and good electrode processing performance. Although lithium nickelate has a high reversible specific capacity (210mAh / g), it cannot be applied in practical lithium-ion batteries due to its poor structural and thermal stability a...

AI Technical Summary

Problems solved by technology

Although the use of inorganic oxides or phosphates to coat and modify the positive electrode material will improve its cycle performance and safety performance, due to the high temperature heat treatment, the metal oxide or phosphate grains will grow and react with the positive electrode material, often It will cause the surface area of ​​the coated material to increase, the capacity will decrease, and the consistency will be poor, so it is rarely used in actual production

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