Lithium-rich manganese based lithium ion battery cathode material and preparation method thereof

A technology of lithium-rich manganese-based lithium and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor rate performance of positive electrode materials, large irreversible capacity loss, low Coulombic efficiency, etc., to reduce corrosion and improve Effects of the first Coulombic efficiency, enhanced rate performance and cycle stability

Active Publication Date: 2018-09-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, lithium-rich manganese-based cathode materials for lithium-ion batteries have many shortcomings that need to be overcome
When the battery is charged to about 4.5V, Li 2 MnO 3 converted to electrochemically active, lithium from Li 2 MnO 3 The removal of oxygen is accompanied by the removal of oxygen, that is, the actual removal of Li 2 O, Li 2 The release of O is irreversible, resulting in a large loss of irreversible capacity in the first cycle of lithium-rich manganese-based lithium-ion battery cathode materials, and a low first-time Coulombic efficiency.
In addition, the rate performance of lithium-rich manganese-based lithium-ion battery cathode materials is poor, and a phase transition from layered to spinel will occur during cycling.

Method used

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  • Lithium-rich manganese based lithium ion battery cathode material and preparation method thereof
  • Lithium-rich manganese based lithium ion battery cathode material and preparation method thereof
  • Lithium-rich manganese based lithium ion battery cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] This embodiment provides a lithium-rich manganese-based positive electrode material for a lithium-ion battery, which includes a lithium-rich manganese-based positive electrode material, and also includes a spinel phase LiM formed on the surface of the lithium-rich manganese-based positive electrode material. 2 o 4 (M=Mn, Co, Ni, etc.), and a lithium fluoride coating layer coated on the lithium-rich manganese-based positive electrode material.

[0024] In this embodiment, a spinel phase LiM is formed on the surface of the lithium-rich manganese-based positive electrode material of the lithium-rich manganese-based lithium battery positive electrode material. 2 o 4 (M=Mn, Co, Ni, etc.), covered with a lithium fluoride coating layer; among them, the spinel phase LiM 2 o 4 The generation of LiM will lead to the shortening of the platform around 4.6V in the first charging process, that is, the charging capacity will be reduced, and the spinel phase LiM will be discharged d...

Embodiment 2

[0026] On the basis of Example 1, this example provides a method for preparing the lithium-rich manganese-based lithium-ion battery cathode material described in Example 1:

[0027] Step 1, adding ammonium fluoride and lithium carbonate in a certain mass ratio to the lithium-rich manganese-based positive electrode material, and then grinding and mixing uniformly to obtain a mixed powder;

[0028] Step 2. The mixed powder is subjected to low-temperature firing heat treatment under airtight conditions. The chemical reaction that occurs during the treatment process is:

[0029]

[0030]

[0031] Then obtain the required lithium-rich manganese-based lithium battery positive electrode material.

[0032] In this example, the NH 4 NH produced by F decomposition 3 The spinel phase LiM can be formed on the surface of lithium-rich manganese-based cathode materials 2 o 4 , HF and Li produced by the decomposition of NH4F 2 CO 3 Reaction in Li-rich manganese-based cathode mater...

Embodiment 3

[0036] On the basis of Example 2, this example provides a specific preparation method of a lithium-rich manganese-based lithium-ion battery positive electrode material, as follows:

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Abstract

The invention discloses a lithium-rich manganese based lithium ion battery cathode material which comprises a lithium-rich manganese based cathode material, a spinel phase LiM2O4 (M=Mn, Co, Ni, etc.)formed on the surface of the lithium-rich manganese based cathode material and a lithium fluoride coating layer which coats the outside of the lithium-rich manganese based cathode material. The surface of the lithium-rich manganese based cathode material of the lithium-rich manganese based lithium ion battery cathode material is formed with the spinel phase LiM2O4 (M=Mn, Co, Ni, etc.), and the external of the lithium-rich manganese based cathode material is coated with the lithium fluoride coating layer, so that the initial coulomb efficiency of the lithium-rich manganese based lithium ion battery cathode material is effectively improved, the initial cycling irreversible capacity is lowered, and the rate capability and the cycling stability of the lithium-rich manganese based lithium ion battery cathode material are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-rich manganese-based lithium-ion battery cathode material and a preparation method for the lithium-rich manganese-based lithium-ion battery cathode material. Background technique [0002] Due to the advantages of high energy density and long cycle life of lithium-ion batteries, the lithium-ion battery industry has developed rapidly, and its application fields have expanded rapidly. Correspondingly, the requirements for various performance indicators of lithium-ion batteries are also gradually increasing, so the development of high-performance lithium-ion batteries is imminent. At present, the key to developing high-performance lithium-ion batteries is to obtain high-performance cathode materials. The quality of the cathode material directly determines the performance index of the lithium-ion battery. [0003] Lithium-rich manganese-based cathode material...

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 郭华军胡霞王志兴王接喜李新海彭文杰胡启阳
Owner CENT SOUTH UNIV
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