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Modified NCM precursor material and preparation method therefor

A precursor and modification technology, applied in the direction of active material electrodes, electrical components, battery electrodes, etc., can solve the problems of poor thermal stability of ternary materials, excessive cycle performance decline, excessive dissolution of manganese, etc., to improve cycle performance Effect

Inactive Publication Date: 2017-01-11
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a modified NCM precursor material and its preparation method, which can overcome the poor thermal stability, rapid decrease in cycle performance or poor rate performance of ternary materials during use without reducing energy density. , the problem of excessive dissolution of manganese

Method used

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  • Modified NCM precursor material and preparation method therefor
  • Modified NCM precursor material and preparation method therefor
  • Modified NCM precursor material and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Mix 2300g of nickel sulfate hexahydrate, 310g of cobalt sulfate heptahydrate, and 180g of manganese sulfate monohydrate to prepare a mixed salt solution, adjust the molar concentration to 1.5mol / L, add sodium sulfite in an amount of 0.2g / L, and pump 10% ammonia water and 2mol / L sodium hydroxide alkali solution, the reaction temperature is controlled at 45±1°C, the rotation speed is 250r / min, the pH is controlled at 12.8±0.1, and the ammonia content of the reaction solution is kept at about 10g / L.

[0033] After continuous reaction until the particle size is stable at about 10 microns, put the reaction solution into a container, keep it aged at 45°C for 6 hours, and add dilute sulfuric acid diluted to 3% into the reaction solution under stirring to adjust the pH value to 10. Then add sodium dodecylsulfonate, the addition amount is 0.002g / L.

[0034] Prepare 0.1mol / L yttrium nitrate solution and 2mol / L sodium hydroxide lye and pump them into the reaction kettle at the sam...

Embodiment 2

[0037] Mix 2200g of nickel sulfate hexahydrate, 310g of cobalt sulfate heptahydrate, and 180g of manganese sulfate monohydrate to prepare a mixed salt solution, adjust the molar concentration to 1.5mol / L, add sodium sulfite in an amount of 0.2g / L, and pump 18% ammonia water and 4mol / L sodium hydroxide alkali solution, the reaction temperature is controlled at 60±1°C, the rotation speed is 300r / min, the pH is controlled at 12.0±0.1, and the ammonia content of the reaction solution is kept at about 15g / L.

[0038] Continuously react until the particle size is stable at about 10 microns, put the reaction solution into a container and keep aging at 45°C for 8 hours, add dilute sulfuric acid diluted to 3% into the reaction solution under stirring conditions to adjust the pH value to 9, and then Add sodium dodecylsulfonate in an amount of 0.002g / L.

[0039] Prepare 0.1mol / L aluminum chloride solution and 2mol / L sodium hydroxide lye and pump them into the reaction kettle to control t...

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Abstract

The invention relates to a modified NCM precursor material and a preparation method therefor. The molecular formula of the modified NCM precursor material is Ni<(1-a-b-c)>Co<c>MnX(OH)<2>; the modified NCM precursor material is high-density spherical hydroxide, has average grain diameter of 5-20 microns, and density energy of 1.8-2.4g / cm<3>; sodium ions are less than or equal to 0.015%; sulfate radical is less than or equal to 0.15%; and in co-deposition elements, a is greater than or equal to 0.001 and less than or equal to 0.03; b is greater than or equal to 0.05 and less than or equal to 0.3; and b is greater than or equal to 0.1 and less than or equal to 0.3. The preparation method comprises the steps of adding alkali to a nickel cobalt manganese mixed salt solution and performing aging to prepare an NCM substrate; then realizing a coating process on the MCM substrate, and a modified X element salt solution and an alkali precipitator under a stirring effect; and finally performing solid-liquid separation, washing, drying and screening. By adoption of the modified NCM precursor material and the preparation method therefor, the problems of poor thermal stability, over-fast degradation of cycle performance or poor rate capability, and over-dissolution of a manganese element in a user process of a ternary material are overcome under the premise of not lowering energy density.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a precursor for the lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in various small electrical appliances, digital, and mobile electrical equipment, such as mobile phones, computers, cameras, tablet computers, and power tools. Even gradually extending to electric bicycles, HEV\PHEV\EV, the performance requirements for lithium battery cathode materials are getting higher and higher. NCM ternary products integrate LiCoO 2 , LiNiO 2 and LiMnO 2 The advantages of the three materials, due to the obvious synergistic effect between Ni, Co and Mn, the performance of NMC is better than that of single-component layered cathode materials, and it is considered to be one of the most promising new cathode materials, and it is changing with each passing day Advanced electrical equipment ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391
CPCH01M4/1391H01M4/505H01M4/525H01M2004/028Y02E60/10
Inventor 王艳平徐云军尹正中程迪
Owner HENAN KELONG NEW ENERGY CO LTD
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