A kind of preparation method of low lithium manganese ratio layered lithium manganese oxide cathode material

A technology of layered lithium manganate and positive electrode materials, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low utilization rate of raw materials, irregular shape, and uneven particle size, so as to improve utilization rate, Excellent crystallinity and high purity

Active Publication Date: 2022-04-19
ZHONGBEI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some of the preparation processes have gradually matured, but there are many deficiencies, such as low utilization rate of raw materials, uneven particle size, irregular shape, low purity, etc.

Method used

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  • A kind of preparation method of low lithium manganese ratio layered lithium manganese oxide cathode material
  • A kind of preparation method of low lithium manganese ratio layered lithium manganese oxide cathode material
  • A kind of preparation method of low lithium manganese ratio layered lithium manganese oxide cathode material

Examples

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Embodiment 1

[0039] This embodiment provides a method for preparing a low lithium manganese ratio layered lithium manganate positive electrode material, comprising the following steps:

[0040] (a) Lithium hydroxide and manganese trioxide are mixed according to the lithium-manganese molar ratio of 1.5:1, the ball-to-material ratio is 6:1, and the speed is 120 rpm;

[0041] (b) Mix the mixture with potassium hydroxide, add the solution for magnetic stirring to form a mixed solution, the pH of the mixed solution is 13.15, and the magnetic stirring time is 2 hours;

[0042] (c) Place the mixed solution in a fully mixed tank reactor for a homogeneous reaction at 180°C for 10 hours, and the speed of the homogeneous reactor is 5 rpm;

[0043] (d) Wash the product obtained by the homogeneous reaction, put it in a vacuum drying oven with a vacuum degree of 0.08MPa and dry it, and finally obtain the target product o -LiMnO 2 .

Embodiment 2

[0045] This example provides a method for preparing layered lithium manganate as a positive electrode material for lithium batteries with a low lithium-manganese ratio. The preparation process is basically the same as that in Example 1. The pH of the mixture formed by stirring is different, pH=13.24.

Embodiment 3

[0047]This example provides a method for preparing layered lithium manganate as a positive electrode material for lithium batteries with a low lithium-manganese ratio. The preparation process is basically the same as that in Example 1. The pH of the mixture formed by stirring is different, pH=13.31.

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Abstract

The invention relates to a preparation method of a layered lithium manganate positive electrode material with a low lithium-manganese ratio, which belongs to the technical field of lithium-ion batteries; specifically, the lithium source and the manganese source are ball-milled and mixed according to the lithium-manganese molar ratio of 1:1-2:1 material; the product after ball mill mixing is mixed with the process control agent, and the solution is added for magnetic stirring to form a mixed solution with pH=7-14; the mixed solution is subjected to a homogeneous reaction, the reaction temperature is 80-240°C, and the reaction time is 2-48h , rotating speed 1‑100 rpm; the product is washed and dried to finally obtain o ‑LiMnO 2 The present invention reduces the lithium-manganese molar ratio of raw materials, reduces the waste of lithium resources, produces no pollutants in the preparation process, has simple processes, high purity of synthetic products, good crystallinity, smooth particles, small average particle size, and uniform distribution. It is widely used in the technical field of battery materials.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a layered lithium manganate cathode material with a low lithium-manganese ratio. Background technique [0002] Nowadays, more and more attention is paid to the issue of increasing demand for energy. The main source of energy supply is still fossil fuels. With the increasing population, energy shortage and environmental changes, the conversion of alternative energy sources such as solar energy, wind energy, and nuclear energy to electric energy has become an irreversible trend. A technology that needs to be developed at the same time is to store these energy sources in a portable manner. As one of the main methods of electrochemical energy conversion and storage, batteries naturally attract much attention. Therefore, mankind must accelerate the development of various new battery materials and use new energy to meet the needs of human future ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 潘保武张卫俊郝晓剑张卫琦张淑琴李志勇
Owner ZHONGBEI UNIV
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