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A lithium battery cathode material, its preparation method and a lithium ion battery containing the material

A positive electrode material and lithium battery technology, applied in the field of lithium ion battery positive electrode materials, lithium nickel manganese oxide positive electrode materials, can solve the problems of metal manganese dissolution and other issues

Active Publication Date: 2019-01-22
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is no corresponding method to solve the problem of the dissolution of metal manganese in the electrolyte of the spinel lithium nickel manganese oxide positive electrode material. For this reason, the present invention is proposed

Method used

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  • A lithium battery cathode material, its preparation method and a lithium ion battery containing the material
  • A lithium battery cathode material, its preparation method and a lithium ion battery containing the material
  • A lithium battery cathode material, its preparation method and a lithium ion battery containing the material

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preparation example Construction

[0035] The preparation method of lithium battery cathode material of the present invention comprises at least the following three steps:

[0036] (1) According to lithium salt: phosphate molar ratio is 2.5 ~ 3.5: 1, respectively weighed, adding complexing agent to obtain Li a PO4 sol; Phosphate selected from (NH 4 ) 3 PO 4 , (NH 4 ) 2 HPO 4 or NH 4 h2 PO 4 At least one of; Lithium salt is selected from LiOH or Li 2 CO 3 At least one of them; complexing agent is selected from at least one of citric acid, β-hydroxybutyric acid, tartaric acid, phthalic acid, α-naphthaleneacetic acid or diethyltriaminepentaacetic acid, the substance of complexing agent The ratio of the amount of the lithium salt to the sum of the amount of the lithium salt and the phosphate substance is (1.0-1.5):1.

[0037] (2) will Li a PO 4 The sol is fully mixed with spinel lithium nickel manganese oxide, Li a PO 4 The mixing method of sol and spinel lithium nickel manganese oxide is one of ball ...

Embodiment 1～4

[0042] A lithium battery positive electrode material, the surface of which is coated with spinel lithium nickel manganese oxide, the coating layer is made of MnPO 4 , Li 3 PO 4 and Li 4 P 2 o 7 Composition, the structural formula of spinel lithium nickel manganese oxide is LiNi 0.5 mn 1.5 o 4 .

[0043] The preparation method of the lithium battery cathode material is as follows:

[0044] 1. Weigh lithium salt and phosphate respectively according to molar ratio, add complexing agent to obtain Li a PO 4 Sol;

[0045] 2. Will Li a PO 4 The sol is fully mixed with spinel lithium nickel manganese oxide, and dried to obtain a gel precursor;

[0046] 3. Mixing and sintering the gel precursor in an oxygen atmosphere to obtain a spinel lithium nickel manganese oxide positive electrode material to obtain a surface-modified spinel lithium nickel manganese oxide positive electrode material.

[0047] The specific parameters are shown in Table 1.

[0048] Table 1:

[0049] ...

Embodiment 5～8

[0054] A lithium battery positive electrode material, the surface of which is coated with spinel lithium nickel manganese oxide, the coating layer is made of MnPO 4 , Li 3 PO 4 and Li 4 P 2 o 7 The composition and the structural formula of spinel lithium nickel manganese oxide are shown in Table 2 respectively. The preparation steps of the positive electrode material of the lithium battery are the same as in Example 1, and the specific parameters are shown in Table 2.

[0055] Table 2:

[0056]

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Abstract

The invention relates to a lithium battery cathode material, and in particular relates to a lithium nickel manganese oxide cathode material, a preparation method thereof and a lithium battery including the material. The lithium battery cathode material provided by the invention is spinelle lithium nickel manganese oxide coated with a coating layer on the surface; the coating layer includes MnPO4, Li3PO4 and Li4P2O7; the preparation method comprises the steps of: weighing lithium and phosphate, and adding a complexing agent to obtain LiaPO4 sol; mixing the LiaPO4 sol with the spinelle lithium nickel manganese oxide and drying to obtain gel precursor, then mixed sintering, and thereby obtaining the lithium battery cathode material. According to the preparation method of the lithium battery cathode material, the cycling stability and rate performance of the spinelle lithium nickel manganese oxide are improved, and dissolution of manganese of the spinelle lithium nickel manganese oxide in electrolyte is inhibited. The preparation method provided by the invention is applicable to all spinelle lithium nickel manganese oxide cathode materials, and is simple and easy to implement, low in production cost, good in reproducibility and applicable to large-scale industrial production.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery containing the material. Background technique [0002] Compared with traditional lead-acid batteries, nickel-metal hydride batteries and other secondary batteries, lithium-ion batteries have the advantages of high energy density, high output voltage, low self-discharge, no memory effect and environmental friendliness, and have been widely used and developed. The performance of key materials for power and energy storage lithium-ion batteries is the ultimate decisive factor in battery performance, and the research on cathode materials has always been a hot spot for scientists. LiCoO 2 , LiMnO 4 、LiFePO 4 、LiNi x co y mn 1-x-y o 2 Cathode materials have been extensively studied. However, the lithium-ion battery system assembled with the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028H01M2220/20Y02E60/10
Inventor 刘辉徐磊敏王亮王梦王巍柳娜
Owner NINGDE AMPEREX TECH