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Preparation method and application of epitaxial growth layer and sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material

A cathode material, epitaxial growth technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of poor positive cycle performance, rapid voltage decay, low rate performance, etc. The effect of suppressing the release of oxygen, expanding the interplanar spacing, and improving the rate capability

Inactive Publication Date: 2021-01-19
乳源东阳光新能源材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing modified lithium-rich manganese-based positive electrode materials such as poor cycle performance, rapid voltage decay, and low rate performance, and provide an epitaxial growth layer and sulfur-sodium lattice modified Preparation method and application of lithium-rich manganese-based cathode material

Method used

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  • Preparation method and application of epitaxial growth layer and sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material
  • Preparation method and application of epitaxial growth layer and sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material
  • Preparation method and application of epitaxial growth layer and sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material

Examples

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Embodiment 1

[0049] Example 1 Preparation of epitaxial growth layer and sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material

[0050] A method for preparing an epitaxial growth layer and a sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material, comprising the following steps:

[0051] S1. Manganese acetate, nickel acetate and cobalt acetate are fully dissolved in deionized water to obtain a mixed metal salt solution (the concentration of the metal in the mixed metal salt solution is 2mol / L);

[0052] S2. After adding ammonia solution (the mol ratio of the metal in the mixed metal salt solution and ammonia solution is 5: 1, the concentration of ammonia solution is 1.2mol / L) in step S1 gained mixed metal salt solution, use Na 2 CO 3 (concentration is 2mol / L) adjusting pH is 8, stirs and carries out co-precipitation reaction, filters, washes, and dries, obtains lithium-rich manganese-based layered oxide precursor (the mol ra...

Embodiment 2

[0056] Example 2 Preparation of epitaxial growth layer and sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material

[0057] A method for preparing an epitaxial growth layer and a sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material, comprising the following steps:

[0058] S1. Manganese nitrate, nickel nitrate and cobalt nitrate are fully dissolved in deionized water to obtain a mixed metal salt solution (the concentration of the metal in the mixed metal salt solution is 1.8mol / L);

[0059] S2. After adding ammonia solution (the mol ratio of the metal in the mixed metal salt solution and ammoniacal liquor is 10:3, the concentration of ammonia solution is 1mol / L) in step S1 gained mixed metal salt solution, use Na 2 CO 3 (concentration is 2.2mol / L) adjust pH to be 7, stir and carry out co-precipitation reaction, filter, wash, dry, obtain lithium-rich manganese-based layered oxide precursor (the molar ratio of m...

Embodiment 3

[0063] Example 3 Preparation of epitaxial growth layer and sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material

[0064] A method for preparing an epitaxial growth layer and a sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material, comprising the following steps:

[0065] S1. Manganese sulfate, nickel sulfate and cobalt sulfate are fully dissolved in deionized water to obtain a mixed metal salt solution (the concentration of the metal in the mixed metal salt solution is 2.2mol / L);

[0066] S2. After adding ammonia solution (the mol ratio of the metal in the mixed metal salt solution and ammoniacal liquor is 10: 1, the concentration of ammonia solution is 2mol / L) in step S1 gained mixed metal salt solution, use Na 2 CO 3 (concentration is 1.8mol / L) adjust pH to be 9, stir and carry out co-precipitation reaction, filter, wash, dry, obtain lithium-rich manganese-based layered oxide precursor (the mol ratio of ma...

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Abstract

The invention discloses a preparation method and application of an epitaxial growth layer and sodium sulfide lattice modified lithium-rich manganese-based positive electrode material. The epitaxial growth layer and the sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material provided by the invention are simple in preparation method, easy in post-treatment and low incost; the particle size distribution of the prepared positive electrode material is uniform, the discharge specific capacity of the 0.1 C first circle is 304.69 mAh g < -1 >, the discharge specific capacity of the 5C is 129.43 mAh g < -1 >, and the capacity retention rate is 93.31%. Not only are the specific discharge capacity, the rate capability and the cycle performance of the first circle remarkably improved, but also the attenuation of the voltage is effectively relieved; therefore, the epitaxial growth layer and the sulfur-sodium lattice modified lithium-rich manganese-based positive electrode material prepared by the method have wide application prospects in preparation of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of battery cathode materials. More specifically, it relates to a preparation method and application of an epitaxial growth layer and a sulfur-sodium lattice-modified lithium-rich manganese-based positive electrode material. Background technique [0002] With the accelerated consumption of fossil energy, issues such as global warming and environmental pollution pose serious challenges to the development of modern society. The development of sustainable clean energy is the only way for future social development. As a result, people began to seek new clean and renewable energy to reduce dependence on fossil energy. Clean energy such as solar energy, water energy, wind energy, and geothermal energy has attracted widespread attention. The development of new energy sources continues to drive progress in the field of energy storage. Due to the advantages of high energy density, excellent energy conversion effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/58H01M10/0525
CPCH01M4/366H01M4/382H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 吕根品胡康慧向伟程正温益凡
Owner 乳源东阳光新能源材料有限公司
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