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A high-nickel positive electrode material and a preparation method thereof

A positive electrode material, high nickel technology, applied in the field of high nickel positive electrode material and its preparation, can solve the problems of reduced battery safety performance, poor discharge performance of positive electrode material, increased viscosity, etc., meet the requirements of low production equipment, and reduce residual alkali content. , the effect of easy operation and processing

Inactive Publication Date: 2019-01-04
北京盟固利新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the residual alkali (LiOH, Li 2 CO 3 ) content is high, it will lead to strong water absorption of the material, such as the following chemical reactions: LiNi 1-x-y co x Al y o 2 +H 2 O→NiO+LiOH+O 2 ;LiOH+CO 2 → Li 2 CO 3 Li 2 CO 3 +HF→LiF+CO 2
The defect of high residual alkali content on the surface of high-nickel cathode materials not only puts higher requirements on the environmental humidity during storage and use, but also leads to poor stability of the battery cathode material slurry, which is prone to increased viscosity and even jelly phenomenon. Resulting in poor coating performance during the production of battery pole pieces
The high residual alkali content on the surface of high-nickel cathode materials will also lead to low battery capacity, gas production and expansion, resulting in reduced battery safety performance
[0004] In the prior art, there is also some research on the disadvantage of high-nickel cathode materials, but there are generally problems such as cumbersome residual alkali removal operations, or poor discharge performance of cathode materials after treatment, which limits the industry of low-residual alkali content and high-nickel cathode materials application

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  • A high-nickel positive electrode material and a preparation method thereof
  • A high-nickel positive electrode material and a preparation method thereof

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preparation example Construction

[0024] The purpose of the present invention is to provide a method for preparing a high nickel cathode material, which includes the following steps:

[0025] Step 1. Weigh the positive electrode material, add solvent, and stir;

[0026] Step 2: Perform solid-liquid separation on the system in Step 1 to obtain a washed positive electrode material;

[0027] Step 3: Post-processing the positive electrode material after washing to obtain the final product.

[0028] In step 1, weigh the positive electrode material, add solvent, and stir.

[0029] In the present invention, the molecular formula of the cathode material is LiNi 1-x-y Co x M y , Where 1-x-y>0.6, 0.4>x>0, 0.4>y>0, and M is Al, Mn or Mg; preferably, 1-x-y>0.8, 0.2>x>0, 0.2>y>0.

[0030] In the present invention, the positive electrode material is a high nickel positive electrode material that has been sintered once. The sintered high nickel cathode material has less impurities and stable structure, and can be directly processed fo...

Embodiment 1

[0064] Weigh the high nickel cathode material (LiNi 0.88 Co 0.09 Mn 0.03 O 2 ) 100g is crushed, after 300 mesh sieving, add 50g of deionized water, and stir for 10 minutes at a stirring speed of 100 rpm;

[0065] Vacuum filtering the solid-liquid mixture after washing and stirring to obtain a high nickel cathode material with a water content of 8.5 (weight)%;

[0066] The washed high nickel cathode material was placed in a vacuum drying oven, dried at 120°C for 14 hours, and then sintered at 700°C for 18 hours, then crushed and sieved with 300 mesh.

Embodiment 2

[0068] Weigh the high nickel cathode material (LiNi 0.88 Co 0.09 Mn 0.03 O 2 ) 100g is crushed, after 300 mesh sieving, add 100g of deionized water, and stir for 5 minutes at a stirring speed of 100 rpm;

[0069] Vacuum filtering the solid-liquid mixture after washing and stirring to obtain a high nickel cathode material with a water content of 9.6 (weight)%;

[0070] The washed high nickel cathode material was placed in a vacuum drying oven, dried at 120°C for 14 hours, and then sintered at 700°C for 18 hours, then crushed and sieved with 300 mesh.

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Abstract

The invention discloses a high-nickel positive electrode material and a preparation method thereof. The method comprises weighing the positive electrode material, adding a solvent and stirring; solid-liquid separation is carried out to obtain the washed cathode material. Then the washed cathode material is dried and sintered twice to obtain the cathode material with low residual alkali content. Ahigh-nickel cathode material is prepared by washing or pickling the high-nickel cathode material with water or acid at a set time and temperature, strictly controlling conditions such as time and solid-liquid ratio, and the like, so that the high-nickel cathode material has low residual alkali content and good discharge performance. The preparation method has simple and controllable conditions, has low requirements for production equipment, and is a practical method capable of popularization and application.

Description

Technical field [0001] The present invention relates to the field of battery cathode materials, in particular to a high nickel cathode material in a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion power batteries for electric vehicles have gradually become a hot spot in the market and research and development. The cathode materials currently studied mainly include lithium manganese oxide, lithium iron phosphate and ternary systems (nickel cobalt aluminum NCA, nickel cobalt manganese NCM). From the perspective of battery energy density and electric vehicle cruising range, high nickel ternary materials have good application prospects, especially electric vehicles using high nickel ternary nickel cobalt aluminum (NCA) cathode materials have the longest cruising range . [0003] The high specific discharge capacity of the layered high nickel cathode material (at 3.0~4.3V, 25℃, 0.1C rate cycle, the semi-electric discharge specific capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 王燕超林若虚李相旭周玉林苏迎春
Owner 北京盟固利新材料科技有限公司
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