Single crystal ternary cathode material having gradient concentration distribution and primary particle oriented growth, preparation method thereof and lithium ion battery
A cathode material, directional growth technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems affecting the electrochemical stability, storage and safety of NCM materials, and achieve improved rate performance and cycle stability. Beneficial for electrochemical stability and easy storage
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[0044] The present invention also provides a method for preparing the above-mentioned single crystal ternary cathode material, comprising the following steps:
[0045] A) configuring a mixed aqueous solution a of a nickel source compound and a manganese source compound;
[0046] Configuring a mixed aqueous solution b of a manganese source compound, a cobalt source compound and a nickel source compound;
[0047] B) Mix the mixed aqueous solution a, mixed aqueous solution b, lye and complexing agent, and react under alkaline conditions by controlling the feeding speed of the mixed aqueous solution a and mixed aqueous solution b to obtain a concentration gradient distribution 1. A single crystal ternary positive electrode material precursor with directional growth of primary particles. In the single crystal ternary positive electrode material precursor, the contents of Ni and Co are distributed in a gradient in the particles, and the content of Ni gradually decreases from the inn...
Embodiment 1
[0081] 1.1 Preparation of precursors with concentration gradient distribution and primary particle oriented growth microstructure:
[0082] Step a) Preparation: Weigh nickel sulfate and manganese sulfate respectively at a molar ratio of 0.75:0.25, dissolve them in deionized water, mix them uniformly, and place them in solution bottle A at a concentration of 2 mol / L. Weigh manganese sulfate, nickel sulfate, and cobalt sulfate respectively according to 0.25:0.55:0.2, dissolve them in deionized water and mix them evenly. The concentration is 2mol / L and place them in solution bottle B. Prepare 4mol / L sodium hydroxide and 2mol / L ammonia solution.
[0083](b) Under the condition of nitrogen gas protection and continuous stirring, add solution A, 4mol / L sodium hydroxide solution and 2mol / L complexing agent ammonia water to reactor C with a certain feed rate V1, at the same time Add solution B to solution A at a certain feed rate V2, where V1:V2=5:1; stop the reaction when the molar ...
Embodiment 2
[0091] 2.1 Preparation of precursors with concentration gradient distribution and primary particle oriented growth microstructure:
[0092] Step a) Preparation: Weigh nickel nitrate and manganese nitrate respectively at a molar ratio of 0.8:0.2, dissolve them in deionized water, mix them uniformly, and place them in solution bottle A at a concentration of 2 mol / L. Weigh manganese nitrate, nickel nitrate, and cobalt nitrate according to 0.2:0.4:0.4 respectively, dissolve them in deionized water and mix them evenly. The concentration is 2mol / L and place them in solution bottle B. Prepare 4mol / L lithium hydroxide solution and 6mol / L ammonia solution.
[0093] (b) Under the condition of nitrogen gas protection and continuous stirring, add solution A, lithium hydroxide solution of 4mol / L and complexing agent ammonia water of 6mol / L to reactor C with a certain feed rate V1, at the same time Add solution B to solution A at a certain feed rate V2, where V1:V2=2:1; stop the reaction w...
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