Ternary positive electrode material and preparation method therefor and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of lithium-ion batteries, ternary positive electrode materials and their preparation, can solve the problems of poor rate performance and poor cycle stability, and achieve improved rate performance, reduced volume shrinkage, and improved cycle performance. Effects on stability and rate performance

Inactive Publication Date: 2016-06-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome defects such as poor rate performance and poor cycle stability of existing lithium ion positive electrode materials, to provide a ternary positive electrode material with excellent rate performance and cycle stability, a preparation method thereof and a lithium ion battery

Method used

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  • Ternary positive electrode material and preparation method therefor and lithium ion battery

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Embodiment approach

[0021] According to a preferred embodiment of the present invention, the Li 2 SiO 3 Coated in LiNi a co b mn c o 2 The outer surface of the material, this preferred embodiment can further improve the cycle stability and rate performance of the material.

[0022] The purpose of the present invention can be achieved as long as the ternary positive electrode material provided by the present invention has the aforementioned characteristics, and there is no special requirement for its preparation method. Any method that can prepare a ternary positive electrode material with the aforementioned characteristics and properties can be used in the present invention. For the present invention, the preferred ternary positive electrode material is prepared according to the following method, which method includes:

[0023] (1) Mix tetraethyl orthosilicate, organic solvent, water and Ni-Co-Mn ternary material precursor, then remove the organic solvent and water in the mixture obtained by...

Embodiment 1

[0051] This example is used to illustrate the ternary cathode material of the present invention and its preparation method.

[0052] (1) Add 0.1g tetraethyl orthosilicate dropwise to 40ml ethanol aqueous solution (volume ratio of ethanol to water is 100:1), then add 1.5gNi 0.6 co 0.2 mn 0.2 (OH) 2 (Preparation by coprecipitation method), stirred at room temperature, then heated to 50°C and stirred for 350min, then dried at 75°C for 24h;

[0053] (2) Grind the solid matter obtained in step (1) with 0.65g of lithium carbonate evenly, place it in a tube furnace with an oxygen atmosphere for calcination, raise the temperature (heating rate 5°C / min) to 500°C, and treat it at a constant temperature for 3 hours , heating up (heating rate 5°C / min) to 850°C, and constant temperature treatment for 12h. After cooling down to room temperature, the ternary cathode material S-1 was obtained. Calculated according to the amount of feed, Li in S-1 2 SiO 3 The content of Li is 2.9 mol%; ...

Embodiment 2

[0068] This example is used to illustrate the ternary cathode material of the present invention and its preparation method.

[0069] (1) Add 0.3g tetraethyl orthosilicate dropwise to 40ml ethanol aqueous solution (the volume ratio of ethanol to water is 1:0.5), then add 1.5gNi 0.4 co 0.2 mn 0.4 (OH) 2 (Preparation by coprecipitation method), stirred at room temperature, heated to 60°C and stirred for 350min, then dried at 75°C for 24h;

[0070] (2) Grind the solid matter obtained in step (1) with 1.4 g of lithium nitrate evenly, place it in an air-atmosphere tube furnace for calcination, raise the temperature (heating rate 3°C / min) to 400°C, and treat it at a constant temperature for 6 hours , heating up (heating rate 5°C / min) to 950°C, and constant temperature treatment for 8h. After cooling down to room temperature, the ternary cathode material S-2 was obtained. Calculated according to the amount of feed, Li in S-2 2 SiO 3 The content of Li is 10 mol%, and Li 2 SiO ...

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Abstract

The invention relates to the field of a battery, and specifically discloses a ternary positive electrode material and a preparation method therefor and a lithium ion battery. The preparation method comprises the steps of (1) mixing tetraethyl orthosilicate, an organic solvent, water and an Ni-Co-Mn ternary material precursor; then removing the organic solvent and water from the mixture obtained by mixing so as to obtain a solid product; mixing the solid product obtained in the step (1) with a lithium salt, and calcining the mixture under an oxygen atmosphere. The invention also provides the ternary positive electrode material; the ternary positive electrode material contains Li2SiO3 and LiNiaCobMncO2, wherein a, b and c are all greater than 0 and less than 1; and a+b+c is equal to 1. The ternary positive electrode material provided by the invention has relatively high rate capability and cycling stability.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a ternary positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the deterioration of the environment and the scarcity of fossil non-renewable resources, people's demand for new energy is becoming more and more urgent. As a green energy lithium-ion battery, since its successful development in the early 1990s, it has unique advantages such as high specific energy, high working voltage, wide application temperature range, low self-discharge rate, long cycle life, and no pollution. It has attracted much attention and has been widely used in small portable electronic products such as mobile phones, digital cameras, and notebook computers, and has gradually become one of the most important candidate power sources for electric vehicles. However, with the acceleration of the replacement of electronic digital products, the develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M4/624H01M10/0525H01M2004/028H01M2220/20H01M2220/30Y02E60/10
Inventor 吴伯荣穆道斌王垒许洪亮刘琦盖亮江兵毕佳颖陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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