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Quaternary lithium-rich manganese-based positive electrode material using Zn to replace Mn and preparation method of quaternary lithium-rich manganese-based positive electrode material

A cathode material, lithium-rich manganese-based technology, applied in the production field of lithium-rich manganese-based ternary cathode materials, can solve problems such as crystal structure collapse, achieve the effects of promoting grain growth, promoting lattice resonance, and increasing specific surface area

Inactive Publication Date: 2020-03-31
海安常州大学高新技术研发中心
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Problems solved by technology

[0003] In order to improve the stability of lithium-rich manganese-based cathode materials and improve the problem of crystal structure collapse during cycling, the present invention proposes a quaternary lithium-rich manganese-based cathode material that replaces Mn with Zn

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  • Quaternary lithium-rich manganese-based positive electrode material using Zn to replace Mn and preparation method of quaternary lithium-rich manganese-based positive electrode material
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  • Quaternary lithium-rich manganese-based positive electrode material using Zn to replace Mn and preparation method of quaternary lithium-rich manganese-based positive electrode material

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Embodiment Construction

[0029] 1. Precursor preparation.

[0030] 1. Preparation of metal salt solution:

[0031] The following nickel salts can be any one of nickel sulfate, nickel nitrate or nickel acetate.

[0032] The following cobalt salts are any one of cobalt sulfate, cobalt nitrate or cobalt acetate.

[0033] The following manganese salts are any one of manganese sulfate, manganese nitrate or manganese acetate.

[0034] The following zinc salts are any one of zinc sulfate, zinc nitrate or zinc acetate.

[0035] Mix nickel salt, cobalt salt, manganese salt and zinc salt evenly, add deionized water, and prepare a metal salt aqueous solution with a metal cation concentration of 1-2 mol / L. Among them, the metal salt is composed of nickel, cobalt, manganese and zinc, and the molar numbers of the four ions of nickel, cobalt, manganese and zinc in the metal salt solution are o, y, z and 1-o-y-z respectively, and: 0.1<o ≤1, 0.1≤y≤1, 0.1≤z≤1, 0<1-o-y-z≤1.

[0036] In this embodiment, sulfate is u...

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Abstract

The invention discloses a quaternary lithium-rich manganese-based positive electrode material using Zn to replace Mn and a preparation method of the quaternary lithium-rich manganese-based positive electrode material, and belongs to the technical field of lithium ion battery positive electrode material production. A carbonate coprecipitation method is adopted, a metal salt solution and a precipitant solution are controlled to react in a base solution to prepare a precursor, and the precursor is calcined to obtain the positive electrode material with the structural formula of xLi2MnO3-(1-x) LiMO2. According to the method disclosed by the invention, the grade resonance is promoted, a more powerful support is provided for the material, and the stability of the material is improved, so that the performance of the positive electrode material is obviously improved, and the circularity is improved.

Description

technical field [0001] The invention belongs to the technical field of production of positive electrode materials for lithium ion batteries, in particular lithium-rich manganese-based ternary positive electrode materials. Background technique [0002] Lithium-rich manganese-based ternary cathode materials have good performance, high capacity, excellent cycle performance and coulombic rate, low cost, and good safety, so they have attracted widespread attention. At present, the preparation technology of lithium-rich manganese-based cathode materials is becoming more and more mature, and has been widely used in lithium-ion power batteries. However, there are also some problems. Although lithium-rich manganese-based positive electrode materials have high discharge specific energy, such materials are prone to structural collapse and crystal distortion during cycling, and the crystal structure is destroyed. The intercalation and migration of lithium ions At the same time, the sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/485H01M4/505H01M4/525H01M10/0525C01G53/44C01P2004/03C01P2006/40Y02E60/10
Inventor 吕晓霞刘振
Owner 海安常州大学高新技术研发中心
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