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High-nickel positive electrode material with uniform coating layer and preparation method thereof

A technology for positive electrode materials and coating materials, which is applied in the field of high-nickel positive electrode materials and its preparation, can solve the problems of reducing the active lithium content of positive electrode materials and reducing energy density, so as to reduce production costs and time, avoid excessive loss, and improve The effect of specific capacity

Inactive Publication Date: 2019-06-28
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a method, during the post-heat treatment process, lithium in the layered structure is easily released and reacts with alumina, which reduces the active lithium content of the positive electrode material, thereby reducing the energy density.

Method used

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  • High-nickel positive electrode material with uniform coating layer and preparation method thereof
  • High-nickel positive electrode material with uniform coating layer and preparation method thereof
  • High-nickel positive electrode material with uniform coating layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The cathode active material LiNi 0.88 co 0.09 mn 0.03 o 2 1kg and 2.89g of nano-alumina, 2.33g of lithium hydroxide monohydrate are ball milled and stirred evenly, sieved, placed in a sagger, and sintered at 560°C for 6 hours in a preheated muffle furnace oxygen atmosphere (oxygen concentration ≥ 80%) . Cool slowly, crush and sieve to obtain a positive electrode material active material with a uniform coating layer.

Embodiment 2

[0048] The cathode active material LiNi 0.80 co 0.10 mn 0.10 o 2 1kg and 3.49g of nano-zirconia, 2.33g of lithium hydroxide monohydrate, ball mill and stir evenly, sieve, place in a sagger, and sinter at 720°C for 7h in a preheated muffle furnace oxygen atmosphere (oxygen concentration ≥ 80%) . Cool slowly, crush and sieve to obtain a positive electrode material active material with a uniform coating layer.

Embodiment 3

[0050] The cathode active material LiNi 0.80 co 0.10 mn 0.10 o 2 1kg and 5.31g of nano-gallium oxide, 2.33g of lithium hydroxide monohydrate are ball milled and stirred evenly, sieved, placed in a sagger, and sintered at 500°C for 4 hours in a preheated muffle furnace oxygen atmosphere (oxygen concentration ≥ 80%) . Cool slowly, crush and sieve to obtain a positive electrode material active material with a uniform coating layer.

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Abstract

The invention discloses a high-nickel positive electrode material with a uniform coating layer and a preparation method thereof. The preparation method comprises the steps of (1) performing fixed-phase mixing on a high-nickel positive electrode material, a lithium source and a nano coating material to be uniform and screening to obtain a mixture, and (2) placing the mixture in step (1) in a saggarand performing high-temperature sintering, cooling, crushing and sieving in a preheated muffle furnace oxygen atmosphere to obtain a uniform coating layer. According to the invention, the surface ofthe high-nickel positive electrode material is coated with an oxide coating layer, then an additional lithium source is added, and the positive electrode material with good stability and high specificcapacity is obtained through high-temperature sintering. According to the invention, the fixed-phase mixing of the coating material, the high-nickel positive electrode material and the lithium sourceis carried out, the operation is simple, the cost is low, and the mass production is easy to realize.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-nickel positive electrode material with a uniform coating layer and a preparation method thereof. Background technique [0002] In recent years, energy has become an important bottleneck restricting social progress and development. Under the background of national energy security, overtaking in the automobile industry, and environmental protection, my country's new energy-related industries have developed rapidly and vigorously. Lithium-ion batteries are widely used due to their high operating voltage, high energy density, and long life. The positive electrode material directly determines the main performance of lithium-ion batteries. With the increasing requirements of the market for cruising range and energy density, layered high-nickel materials (LiNi) with the advantages of low cost, large discharge capacity, and high energy density x m y o 2 , where...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525C01G53/00B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 王尊志袁徐俊佘圣贤刘志远屈振昊张中光
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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