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

Active Publication Date: 2019-04-02
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the nickel content increases, the dissolution of transition metal ions will increase, especially the proportion of manganese dissolution is still relatively high, which will affect the electrochemical stability, storage and safety of NCM materials.

Method used

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  • Single crystal ternary cathode material having gradient concentration distribution and primary particle oriented growth, preparation method thereof and lithium ion battery
  • Single crystal ternary cathode material having gradient concentration distribution and primary particle oriented growth, preparation method thereof and lithium ion battery
  • Single crystal ternary cathode material having gradient concentration distribution and primary particle oriented growth, preparation method thereof and lithium ion battery

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preparation example Construction

[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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Abstract

The invention provides a single crystal ternary cathode material having gradient concentration distribution and primary particle oriented growth. The single crystal ternary cathode material having gradient concentration distribution and primary particle oriented growth microstructure does not easily produce stress to destroy the structure during charge and discharge compared to ternary cathode materials having a core-shell structure of a two-phase interface and a non-directional growth structure; the surface Mn content is the same as the bulk Mn content, which effectively alleviates the dissolution of Mn element during the cycle; the structure of primary particle oriented growth can greatly shorten the Li+ migration distance and increase the migration rate of Li+, thereby improving the rate performance and cycle stability of the material; the surface of single crystal particles is smooth, can be in good contact with a conductive agent, and is greatly compact, which is beneficial to increasing the volumetric energy density of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a single crystal ternary positive electrode material with concentration gradient distribution and directional growth of primary particles, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used because of their outstanding advantages such as high specific energy, small self-discharge, long service life, green and pollution-free. At present, the performance improvement of the characteristics of ternary materials for commercial applications has become a hot research direction of ternary materials. [0003] High nickel ternary lithium ion battery cathode material LiNi 1-x-y co x mn y o 2 (NCM) has become a research hotspot due to its advantages of high specific capacity, low cost and excellent safety, and is considered to be a very promising cathode material for lithium-ion power...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 朱永波佘圣贤袁徐俊任万里黄连友戚洪亮
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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