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Boron-doped lithium phosphate coated lithium ion battery positive electrode material and preparation method thereof

A positive electrode material and ion battery technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of insufficient lithium phosphate precipitation speed and reaction degree, unfavorable residual lithium control of finished materials, and insufficient lithium ion conduction capacity , to achieve the effect of overcoming the slow precipitation of lithium phosphate, improving the conduction capacity of lithium ions, and enhancing the stability of the surface structure

Active Publication Date: 2021-04-02
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The wet coating process is complicated, and the organic system coating has production safety risks, which is not conducive to the batch industrialization of materials;
[0005] (2) Wet coating needs to add an additional lithium source, which is not conducive to the control of residual lithium in the finished material, and the precipitation speed and reaction degree of lithium phosphate are also relatively insufficient;
[0006] (3) Single Li 3 PO 4 The lithium ion conduction ability of the coating is insufficient, and the coating effect needs to be further improved

Method used

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  • Boron-doped lithium phosphate coated lithium ion battery positive electrode material and preparation method thereof
  • Boron-doped lithium phosphate coated lithium ion battery positive electrode material and preparation method thereof
  • Boron-doped lithium phosphate coated lithium ion battery positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] A kind of boron-doped lithium phosphate of the present invention coats lithium ion battery cathode material, is based on Li 0.980 Ni 0.877 co 0.090 mn 0.030 Zr 0.003 o 2 is the substrate, and the outer surface of the substrate is coated with boron-doped Li 3 PO 4 The cladding layer is based on the total mass of the substrate. The content of phosphorus in the cladding layer is 2590ppm, and the content of boron is 390ppm. The positive electrode material is composed of secondary spherical particles formed by agglomeration of primary particles. D50 is 10.5um.

[0037] The preparation method of the boron-doped lithium phosphate coated lithium-ion battery positive electrode material of the present embodiment comprises the following steps:

[0038] (1) Matrix preparation:

[0039] 500g Ni0.88 co 0.09 mn 0.03 (OH) 2 Precursor and 229.2g lithium hydroxide monohydrate, 2.55g nanoscale ZrO 2 After mixing evenly, feed the oxygen flow rate (50L / min) into the box-type atm...

Embodiment 2

[0051] The preparation process of the boron-doped lithium phosphate-coated lithium ion positive electrode material in this example is basically the same as in Example 1, except that the amount of boron added in step (2) is different, and the other preparation processes are the same. The steps of this example ( 2) In 1.1g of chemically pure H 3 BO 3 Dissolve in 100g deionized water to prepare solution B.

[0052] The remaining lithium test and electrochemical performance evaluation were carried out on the coated positive electrode material prepared in this example.

Embodiment 3

[0054] The preparation process of the boron-doped lithium phosphate-coated lithium ion positive electrode material in this example is basically the same as in Example 1, except that the amount of coating agent in step (3) is different, and the other preparation processes are exactly the same. In this example, step (3) The operation is to "weigh 300g of the base material prepared in step (1) and mix evenly with 1.4g of the coating agent prepared in step (2), and then sinter at a constant temperature of 550°C for 6 hours in an oxygen atmosphere to obtain doped lithium borophosphate Encapsulated cathode materials for lithium-ion batteries".

[0055] The remaining lithium test and electrochemical performance evaluation were carried out on the coated positive electrode material prepared in this example.

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Abstract

The invention discloses a boron-doped lithium phosphate coated lithium ion battery positive electrode material, which takes a layered structure oxide with high nickel content as a matrix, and the outer surface of the matrix is coated with a boron-doped Li3PO4 coating layer. The preparation method comprises the following steps: (1), adding a lithium source, a phosphorus source and a boron source into a high-pressure reaction kettle for hydrothermal reaction, and after the reaction is finished, performing cooling, washing, filtering and drying to obtain a coating agent; and (2), weighing a basematerial and the coating agent according to a stoichiometric ratio, uniformly performing mixing, and performing sintering to obtain the boron-doped lithium phosphate coated lithium ion battery positive electrode material. By introducing a proper amount of boron into the lithium phosphate coating layer of the lithium ion battery positive electrode material, the lithium ion conduction capability ofthe lithium ion battery positive electrode material is effectively improved, so that the positive electrode material coated with the coating layer shows relatively good capacity and rate capability and has a relatively low DCIR growth rate.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery cathode materials, in particular to a boron-doped lithium phosphate-coated lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Ternary lithium transition metal oxides (LiTMO) with high nickel content 2 ) cathode material has a high specific capacity (≥200mAh / g), which can meet the high energy density requirements of lithium-ion batteries for electric vehicles, and has become one of the current research hotspots. However, high-nickel cathode materials are also accompanied by problems such as unstable bulk phase structure and increased surface side reactions, which make the performance of the battery such as cycle, high temperature, storage, and gas production unsatisfactory. Surface coating and modification can prevent the fragile high-nickel cathode material from being in direct contact with the electrolyte, avoiding decomposition and oxidation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C01B25/30C01G53/00
CPCH01M4/366H01M4/505H01M4/525H01M4/626H01M4/628H01M10/0525C01G53/50C01B25/30C01P2004/03C01P2004/61C01P2004/32H01M2004/021H01M2004/028Y02E60/10
Inventor 刘瑞福宁漂唐波韩圭奭
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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