A nickel-cobalt-manganese ternary positive electrode material precursor for lithium batteries, its preparation method, and the prepared positive electrode material

Abstract

A nickel-cobalt-manganese ternary positive electrode material precursor for lithium batteries, a preparation method thereof, and the prepared positive electrode material. The preparation method of the ternary positive electrode material precursor comprises: 1) combining a soluble inorganic salt of nickel and a soluble cobalt The soluble inorganic salt of inorganic salt and manganese is prepared into mixed salt solution; 2) use deionized water as reaction base liquid, and add surfactant in reaction base liquid; 3) under inert atmosphere, to described step 2) in Add ammonia water to the reaction base liquid to stabilize the pH of the reaction system in the range of 10.5 to 11.5, add the mixed salt solution, sodium hydroxide solution, and ammonia water in step 1) to the reaction base liquid under stirring conditions to maintain the pH of the reaction system Stable, and the precursor of the nickel-cobalt-manganese ternary cathode material is prepared. The invention controls the size and stacking mode of the primary particles in the precursor by adding a surfactant and changing the concentration of ammonia water during the synthesis process, thereby controlling the physical and electrochemical properties of the ternary positive electrode material.

Description

technical field [0001] The invention relates to a nickel-cobalt-manganese ternary cathode material precursor for lithium batteries, a preparation method thereof, and the prepared nickel-cobalt-manganese ternary cathode material, which belong to the field of chemical energy storage batteries. Background technique [0002] With the increasing environmental pollution and energy crisis worldwide, the development and application of new pollution-free energy materials is the key to solving the above problems. Among them, lithium-ion batteries have been widely used because of their high energy density, long cycle life, and low pollution. Especially in recent years, the rapid development of electric vehicles and hybrid vehicles has greatly promoted the development of lithium-ion battery technology, and at the same time put forward higher requirements for the performance of lithium-ion batteries. [0003] The cathode material in lithium-ion batteries is a key material that determine...

AI Technical Summary

Problems solved by technology

Among them, LiCoO 2 It is the first generation of layered cathode material, which has excellent rate performance and stable cycle performance, but its actual capacity is only about 50% of the theoretical capacity, and the price of Co is expensive, which greatly increases its cost

LiMnO 2 It has high thermal stability and low cost, but poor cycle performance and fast capacity decay

LiFePO 4 It has excellent thermal stability and cycle performance, but the actual capacity is low and the rate performance is also poor

The above positive electrode materials all limit the improvement of the capacity of lithium-ion batteries, and it is difficult to meet the needs of high-performance power batteries.

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