Method for surface coating modified spinel phase positive electrode material

A positive electrode material and surface coating technology, which is applied in the field of surface coated modified spinel phase positive electrode materials, can solve problems such as crystal structure differences

Inactive Publication Date: 2019-08-09
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the crystal structure of these surface materials differs greatly from that of spinel phase materials

Method used

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  • Method for surface coating modified spinel phase positive electrode material
  • Method for surface coating modified spinel phase positive electrode material
  • Method for surface coating modified spinel phase positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Add 0.03mol of citric acid and 0.02mol of glucose into 50ml of deionized water, after the citric acid and glucose are dissolved, add 0.01mol of magnesium nitrate and 0.02mol of aluminum nitrate, stir and dissolve to form Sol A;

[0083] Add 140.84g of lithium manganate cathode material to sol A, stir magnetically at room temperature for 30min at a speed of 400r / min to form sol B;

[0084] The sol was evaporated to dryness with magnetic stirring at a constant temperature of 90°C to obtain a xerogel;

[0085] Grinding the above-mentioned xerogel to obtain a grinding product, and then heat-treating the grinding product at 850° C. for 3 hours under an air atmosphere, and then cooling in a furnace to finally obtain a surface-modified lithium manganate.

[0086] Scanning electron microscopy was carried out on it, and the results were as follows: figure 1 shown by figure 1 It can be seen that the particles of lithium manganate modified by surface coating have good particle d...

Embodiment 2

[0089] Add 0.03 mol of citric acid and 0.02 mol of glucose to 50 ml of deionized water, after the citric acid and glucose are dissolved, add 0.01 mol of magnesium nitrate and 0.02 mol of aluminum nitrate, stir and dissolve to form sol A;

[0090] Add 140.84g of lithium nickel manganese oxide positive electrode material to sol A, stir magnetically at room temperature for 30min at a speed of 400r / min to form sol B;

[0091] The sol was evaporated to dryness with magnetic stirring at a constant temperature of 90°C to obtain a xerogel;

[0092] Grinding the above xerogel to obtain a grinding product, then heat-treating the grinding product at 900° C. for 2 hours in an air atmosphere, and then cooling in a furnace to finally obtain a surface-modified lithium nickel manganese oxide.

[0093] Scanning electron microscopy was carried out on it, and the results were as follows: figure 2 shown by figure 2 It can be seen that the particles of lithium nickel manganese oxide modified b...

Embodiment 3

[0096] Add 0.03 mol of citric acid and 0.02 mol of glucose to 50 ml of deionized water, after the citric acid and glucose are dissolved, add 0.01 mol of magnesium nitrate and 0.02 mol of aluminum nitrate, stir and dissolve to form sol A;

[0097] Add 211.26g of lithium nickel manganese oxide positive electrode material to sol A, and magnetically stir at room temperature for 30min at a speed of 400r / min to form sol B;

[0098] The sol was evaporated to dryness with magnetic stirring at a constant temperature of 100°C to obtain a xerogel;

[0099] Grinding the above xerogel to obtain a grinding product, then heat-treating the grinding product at 900° C. for 2 hours in an air atmosphere, and then cooling in a furnace to finally obtain a surface-modified lithium nickel manganese oxide. Its scanning electron microscope picture and XRD collection of illustrative plates are similar to embodiment 2 result.

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Abstract

The invention discloses a method for surface coating modified spinel phase positive electrode material. The method comprises the following steps: 1. preparing a sol A by mixing metal salt and a chelating agent; 2, adding the spinel phase positive electrode material into the sol A and stirring so as to obtain a sol B; 3, heating and evaporating the sol B so as to obtain an xerogel; and 4, performing post-treatment on the xerogel so as to obtain the final product. According to the prepared surface coating modified spinel phase positive electrode material, the coating layer and the bulk phase material have similar crystal structure and cell parameters, and the thickness of the surface coating epitaxial growth layer is uniform so that the positive electrode material has good magnification performance and cycling performance. The method is simple and feasible, low in cost, low in energy consumption and simple in industrial large-scale production.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for surface coating a modified spinel phase positive electrode material. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high energy density, good cycle performance, low self-discharge rate, and environmental friendliness. They are widely used in 3C digital, energy storage power stations, electric vehicles and other fields. During the charging and discharging process of lithium-ion batteries, the positive electrode material can provide a large number of freely intercalated and deintercalated lithium ions, so the performance of lithium-ion batteries is mainly determined by its positive electrode material. With the rapid development of power vehicles in recent years, the market has higher and higher requirements for the specific capacity, rate performance, cycle performance and safety performance of cath...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 刘海强白珍辉魏卫沈恋高志平卢兴华赵广彬周玉林沙金苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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