Preparation method and application of a high-rate ternary cathode material

Abstract

The invention relates to the technical field of cathode materials for lithium-ion batteries, and particularly discloses a preparation method and application of a high-rate ternary cathode material. The preparation method of the high-magnification ternary positive electrode material is characterized in that: preparing nickel, cobalt, manganese salt mixed solution, ammonia solution and precipitant solution; adding ammonia solution and deionized water to the reaction kettle to mix evenly, Add nickel, cobalt, manganese salt mixed solution and precipitant solution, carry out co-precipitation reaction under the protection of inert gas, obtain precursor material after separation, washing and drying; mix precursor material and lithium salt evenly, in an oxygen atmosphere , after pre-calcination, the temperature rises and reacts to obtain the positive electrode material LiNi x co 1‑x‑y mn y o 2 . The positive electrode material prepared by the invention has excellent rate performance while ensuring high specific capacity and easy processing, and the 5C discharge gram specific capacity of the half-cell is more than 85% of the 1C discharge specific capacity.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a preparation method and application of a high-rate ternary cathode material. [0003] (2) Background technology [0004] Lithium-ion battery is a new type of secondary battery. Due to its obvious advantages such as high specific energy, long cycle life, good discharge stability, low environmental pollution and great development potential, it has become a new model for the development and development of the global energy industry. focus direction. [0005] Lithium-ion battery cathode materials mainly include lithium iron phosphate, lithium manganese oxide, nickel-cobalt lithium manganese oxide, etc. Lithium iron phosphate has good cycle performance, but low energy density, poor low-temperature performance, and poor batch stability; lithium manganate is cheap, but has disadvantages such as low energy density and poor high-temperature cycle ...

AI Technical Summary

Problems solved by technology

Lithium iron phosphate has good cycle performance, but low energy density, poor low-temperature performance, and poor batch stability; lithium manganate is cheap, but has disadvantages such as low energy density and poor high-temperature cycle performance; ternary cathode materials have higher rolling Density, specific capacity, excellent high and low temperature performance, and low cost have become the most potential and most promising anode materials among many cathode materials. They are favored by people and are widely used in consumer products, digital products, and power products. and drones

However, the nickel-cobalt-lithium-manganese-oxide material currently commercialized in the Chinese market still has the problem of poor rate performance, which is difficult to meet people's demand for fast charging of power batteries and power batteries working at higher power.

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