High-nickel ternary material, surface modification method and lithium ion battery

A high-nickel ternary material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc. The effect of suppressing excessive precipitation of Li+ and protecting the structure stability

Active Publication Date: 2020-12-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the water washing process is simple and easy, and can effectively reduce the residual alkali on the surface, high-nickel ternary materials are sensitive to moisture, and long-term

Method used

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  • High-nickel ternary material, surface modification method and lithium ion battery
  • High-nickel ternary material, surface modification method and lithium ion battery
  • High-nickel ternary material, surface modification method and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Pour 50kg of deionized water into a water washing kettle lined with polytetrafluoroethylene, then add the first additive composed of lithium sulfate solution to the deionized water, stir evenly, and then burn the powder according to the high-nickel ternary material and The solid-to-liquid ratio of deionized water is 1:1 and LiNi is added 0.85 co 0.10 mn 0.05 o 2 Burn the powder and stir at a high speed to form a uniform first slurry, wherein, in the first additive, Li + The effective ion content is 0.05wt%, and the addition amount of the first additive is 5wt% of the mass of the added high-nickel ternary material-sintered powder.

[0052] By TiO 2+ :Al 3+ :AlO 2 - The molar ratio of =1:1:5 is added dropwise to the first slurry simultaneously and the content is that the effective ion content is 0.01wt% TiOSO 4 Sulfuric acid solution, 0.01wt% Al 2 (SO 4 ) 3 Sulfuric acid solution and 0.05wt% NaAlO 2 Sodium hydroxide solution, TiOSO 4 The amount of sulfuric ac...

Embodiment 2

[0062] In embodiment 1, the high-nickel ternary material-sintered powder material is replaced by LiNi 0.90 co 0.05mn 0.05 o 2 Burn powder material, successively wash with water, centrifugal and coulter vacuum drying steps are with embodiment 1. Then, the dried powder was placed in a muffle furnace in an oxygen atmosphere, and the temperature was raised to 650° C. for 5 hours. Finally, naturally cool to room temperature to obtain low residual alkali and uniform surface coating of Al 2 o 3 and TiO 2 LiNi 0.90 co 0.05 mn 0.05 o 2 .

Embodiment 3

[0064] In embodiment 1, the high-nickel ternary material-sintered powder material is replaced by LiNi 0.65 co 0.20 mn 0.15 o 2 Burn powder material, washing successively, centrifugal drying and plow blade vacuum drying steps are the same as embodiment 1. Then, the dried high-nickel ternary material was placed in a muffle furnace in an air atmosphere, and the temperature was raised to 700° C. for 5 hours. Finally, naturally cool to room temperature to obtain low residual alkali and uniform surface coating of Al 2 o 3 and TiO 2 LiNi 0.65 co 0.20 mn 0.15 o 2 .

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Abstract

The invention discloses a high-nickel ternary material, a surface modification method and a lithium ion battery. The surface modification method comprises the following steps: firstly introducing soluble salt of cation Li+ as a first additive in the washing process, and then introducing a TiOSO4 acid solution, wherein the third additive is an Al2(SO4)3 acid solution, and the fourth additive is a NaAlO2 alkaline solution; and finally performing separating, drying and calcining to obtain the surface-modified high-nickel ternary material. The high-nickel ternary material obtained by the surface modification method can effectively reduce the residual alkali on the surface of the high-nickel ternary material and improve the structural stability.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a surface modification method of a high-nickel ternary material, a high-nickel ternary material obtained by the surface modification method, and a lithium ion battery containing the high-nickel ternary material. Battery. Background technique [0002] With the development of new energy vehicles, the demand and requirements for new energy power batteries are also increasing. By 2020, the specific energy requirements of new energy power batteries will reach more than 300Wh / kg, and strive to achieve 350Wh / kg. But at present, the highest energy density of a lithium iron phosphate battery cell is only 200Wh / kg, which is far from the goal of 300Wh / kg. Therefore, ternary material batteries take on the tough task. Considering the demand for power battery energy density improvement and the impact of rising global cobalt prices, ternary material batteries with les...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/525H01M4/36H01M4/04H01M10/42
CPCH01M10/0525H01M4/525H01M4/366H01M4/0416H01M4/0471H01M10/4235Y02E60/10
Inventor 闵长青王振昆龙君君高玉仙丁楚雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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