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High-voltage long-circulation high-nickel single crystal positive electrode material as well as preparation method and application thereof

A technology of positive electrode material and single crystal material, which is applied in the field of high voltage long cycle high nickel single crystal positive electrode material and its preparation, can solve the problems of battery capacity and cycle performance degradation, intensified mixing structure, etc. The effect of delaying transition and enhancing high-pressure cycling stability

Active Publication Date: 2019-05-28
GUANGDONG BRUNP RECYCLING TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon is called cation mixing. With the increase of the number of cycles and the influence of electrolyte decomposition and other factors, this mixing structure will continue to intensify, thereby transforming the layered structure of the material into a rock-salt structure, resulting in battery Severe attenuation of capacity and cycle performance

Method used

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  • High-voltage long-circulation high-nickel single crystal positive electrode material as well as preparation method and application thereof
  • High-voltage long-circulation high-nickel single crystal positive electrode material as well as preparation method and application thereof
  • High-voltage long-circulation high-nickel single crystal positive electrode material as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0044] The preparation method of the high-voltage long-cycle high-nickel single crystal positive electrode material in this embodiment is as follows:

[0045] 1) Weigh lithium hydroxide, urea and water respectively according to the mass ratio of 5%, 15%, and 80%. Specifically, add 33.19g of lithium hydroxide and 99.56g of urea into 530.98g of deionized water, stir until dissolved and place Cool down to -12°C in the refrigerator. Lithium source solution A is obtained.

[0046] 2) Solution A was stirred at high speed, and 26.55 g of α-cellulose powder (length less than 25 μm) was added at the same time, and the mass of α-cellulose powder accounted for 4% of the total mass of solution A. Continue stirring until dissolved to obtain carbon source sol B.

[0047] 3) According to the ratio of precursor to lithium hydroxide molar ratio of 1:1.05, add Ni with particle size D50 of 4.5 μm to sol B 0.8 co 0.1 mn 0.1 (OH) 2 Precursor 70g, high-speed stirring to disperse, then turn to l...

Embodiment 2

[0058] The preparation method of the high-voltage long-cycle high-nickel single crystal positive electrode material in this embodiment is as follows:

[0059] 1) Weigh lithium hydroxide, thiourea and water according to the mass ratio of 4%, 12%, and 84%, respectively, specifically add 32.86g of lithium hydroxide and 98.58g of thiourea to 690.0g of deionized water, and stir until dissolved Then place in the refrigerator to cool down to -15°C. Lithium source solution A is obtained.

[0060] 2) Solution A was stirred at high speed, and 28.75 g of β-cellulose powder (length less than 25 μm) was added at the same time, and the mass of β-cellulose accounted for 3.5% of the total mass of solution A. Continue stirring until dissolved to obtain carbon source sol B.

[0061] 3) According to the ratio of precursor to lithium hydroxide molar ratio of 1:1.05, add Ni with particle size D50 of 4.5 μm to sol B 0.6 co 0.2 mn 0.2 (OH) 2 Precursor 70g, high-speed stirring to disperse, then...

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Abstract

The invention discloses a high-voltage long-circulation high-nickel single crystal positive electrode material as well as a preparation method and application thereof. A high-voltage long-circulationhigh-nickel single crystal positive electrode material has a chemical formula of LiNixCoyMn1-x-yO2. In the formula, x is greater than or equal to 0.6 and less than 1, and y is greater than 0 and lessthan or equal to 0.4; wherein a nickel-lithium mixed shell layer is arranged on the surface of the high-nickel single crystal positive electrode material, and the concentration of metal elements in the high-nickel single crystal positive electrode material is in gradient distribution. The invention also discloses a preparation method of the high-voltage long-circulation high-nickel single crystalpositive electrode material and an application of the high-voltage long-circulation high-nickel single crystal positive electrode material. A nickel-lithium premixing row layer is formed on the surface of the high-nickel single crystal positive electrode material, so that the structure of the material is stabilized, electrolyte erosion is prevented, and further transformation of the material structure is delayed. Metal elements in the material are distributed in a gradient concentration mode, and the high-pressure cycling stability of the material is enhanced through the gradient distributionstructure.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a high-voltage long-cycle high-nickel single crystal positive electrode material and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of the new energy industry, new energy vehicles have gradually entered the field of vision of the general public. At the same time, people have higher and higher requirements for the endurance and fast charging capabilities of new energy vehicles. Traditional power ternary lithium-ion batteries (including NCM111, NCM523, etc.) can no longer meet people's needs, so people consider further increasing the content of nickel in ternary positive electrode materials to increase capacity, and at the same time use small-sized single crystal particles to improve Rate performance and cycle performance. [0003] There are still many problems to be solved in the proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 李伟权刘更好阮丁山林波李邑柯李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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