Preparation method for high-nickel material surface coating layer

A surface coating and high-nickel technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high equipment requirements, poor repeatability, cumbersome coating process, etc., to reduce side reactions, reduce the amount of residual alkali on the surface, Effect of improving cycle stability and storage performance

Inactive Publication Date: 2016-01-27
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most commonly used coating methods are sol-gel method, metal salt and precipitant co-precipitation method + high temperature solid phase method, etc. The coating process is cumbersome, requires high equipment, poor repeatability, and increases production costs.

Method used

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  • Preparation method for high-nickel material surface coating layer
  • Preparation method for high-nickel material surface coating layer
  • Preparation method for high-nickel material surface coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Testing LiNi by Potentiometric Titrator 0.85 co 0.1 Al 0.05 o 2 The total base number of the material, the H needed to calculate the residual lithium on the precipitation surface 3 BO 3 The amount of precipitant is prepared to have a solution concentration of 0.1mol / L. 1000gLiNi 0.85 co 0.1 Al 0.05 o 2 Dissolve in 400g deionized water and stir to form a slurry, place it in the reaction kettle, and add H 3 BO 3 The solution was stirred and reacted in the reactor, and the dropwise addition was stopped when the pH of the solution was 11.6, and the stirring was continued for 30 minutes. The resulting suspension was then evaporated to remove water at 120°C. The obtained dry powder was heated to 700 °C in an oxygen-containing atmosphere, kept at this temperature for 10 hours, and then naturally cooled to room temperature to obtain Li 3 BO 3 Surface coated modified materials.

[0023] The SEM images of the high-nickel material before and after surface coating are...

Embodiment 2

[0025] Adopt the method identical with embodiment 1 to calculate LiNi 0.8 co 0.1 mn 0.1 o 2 NH required for residual lithium on the surface 4 F dosage, prepare its solution concentration to be 0.2mol / L. 1000gLiNi 0.8 co 0.1 mn 0.1 o 2 Dissolve in 400g of deionized water and stir to form a slurry, which is placed in the reaction kettle, and NH 4 The F solution was added dropwise to the reactor, and the dropwise addition was stopped when the pH of the solution was 11.5. The obtained suspension was not washed, and the drying method was stirring and drying in a water bath. The obtained dry powder was heated to 650° C. in an oxygen-containing atmosphere, kept for 8 hours, and then naturally cooled to room temperature to obtain a LiF surface-coated modified material.

Embodiment 3

[0027] Adopt the method identical with embodiment 1 to calculate LiNi 0.8 co 0.2 o 2 Requirements for residual lithium on the surface (NH 4 ) 2 HPO 4 Dosage, the preparation of its solution concentration is 0.15mol / L. 1000gLiNi 0.8 co 0.2 o 2 Dissolve in 400g deionized water and stir to form a slurry, which is placed in a reactor, and simultaneously (NH 4 ) 2 HPO 4 The solution was added dropwise to the reaction kettle, and the dropwise addition was stopped when the pH of the solution was 11.2, mechanically stirred at room temperature for 30 minutes, then filtered and washed, and the sample was dried in a vacuum oven at 120°C for 10 hours. The obtained material was heated to 750 °C in an oxygen-containing atmosphere, kept at this temperature for 8 hours, and then naturally cooled to room temperature to obtain Li 3 PO 4 Surface coated modified materials.

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Abstract

The invention discloses a preparation method for a high-nickel material surface coating layer, and in particular relates to a preparation method for a lithium-contained coating layer formed by residual lithium on the surface of the high-nickel material. A negative ion with a function of depositing the residual lithium on the surface of the high-nickel material is adopted for coating the surface of the high-nickel material; the residual amount of alkali on the surface of the high-nickel material is effectively reduced by the preparation method; and meanwhile, the coating layer enables the high-nickel material and an electrolyte to be separated, so that the side reaction between the electrolyte and the surface is reduced, and cycling stability and the storage property of the material are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery cathode materials, and in particular relates to a preparation method for forming a lithium-containing coating layer with residual Li on the surface of a high-nickel material. Background technique [0002] Lithium-ion batteries have become the most promising high-energy secondary batteries at present due to their advantages of high energy, safety, reliability, long life, and no pollution. For more than 20 years since the commercialization of lithium-ion batteries, the actual capacity of cathode materials has always been between 100 and 180mAh / g. The low specific capacity of cathode materials has become a bottleneck for improving the specific energy of lithium-ion batteries. LiNiO 2 And its dopant compound is generally considered to be the most likely to replace LiCoO due to its higher specific capacity 2 positive electrode material. [0003] High nickel material LiNi x m 1-x o 2 (x≥0.6, M i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCY02E60/10
Inventor 冯海兰刘大亮刘亚飞
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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