Ternary positive electrode material doping and coating method, ternary positive electrode material and lithium ion battery

A positive electrode material and coating technology, applied in the field of new energy, can solve the problems of cumbersome process, unfavorable industrial production, high production cost, etc., achieve the effect of stabilizing the material structure, eliminating the need for abrasive and mixing operations, and enhancing the coating effect

Active Publication Date: 2021-06-18
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing coating and doping methods still need to be further improved in terms of improving safety, reducing gas production, and improving cycle performance. Industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a method for doping and covering a ternary positive electrode material, including the following steps:

[0051] ① Precursor synthesis: First weigh soluble nickel salt, soluble cobalt salt and soluble manganese salt according to the molar ratio of 8:1:1 to prepare nickel-cobalt-manganese ternary mixed solution A (the total metal cation concentration in mixed solution A is 0.6mol / L); prepare 10g / L zirconium chloride solution B, in which zirconium chloride accounts for 0.2% of the total mass of the one-fired material H; prepare 0.5mol / L sodium silicate solution C, the solution C The sodium silicate in accounts for 0.2% of the gross mass of one burnt material H;

[0052] Then prepare 5mol / L lye D (specifically sodium hydroxide solution) and 8mol / L ammonia solution E,

[0053] Mix the mixed solution A, solution B and solution C to obtain a mixed system, then add lye D and solution E to the mixed system simultaneously, and react to synthesize the te...

Embodiment 2

[0059] This embodiment provides a method for doping and covering a ternary positive electrode material, including the following steps:

[0060] ① Precursor synthesis: first weigh soluble nickel salt, soluble cobalt salt and soluble manganese salt according to the molar ratio of 83:11:6 to prepare nickel-cobalt-manganese ternary mixed solution A (the total metal cation concentration in mixed solution A is 0.5mol / L); prepare 20g / L titanium nitrate solution B, the titanium nitrate in the solution B accounts for 0.15% of the total mass of the first-fired material H; prepare 0.8mol / L sodium silicate solution C, the silicic acid in the solution C Sodium accounts for 0.25% of the total mass of the first-fired material H;

[0061] Then prepare 7mol / L lye D (specifically sodium hydroxide solution) and 10mol / L ammonia solution E,

[0062] Mix the mixed solution A, solution B and solution C to obtain a mixed system, then add alkali solution D and solution E to the mixed system simultan...

Embodiment 3

[0068] ① Precursor synthesis: according to the molar ratio of 88:9:3, first weigh soluble nickel salt, soluble cobalt salt and soluble manganese salt to prepare nickel-cobalt-manganese ternary mixed solution A (the total metal cation concentration in mixed solution A is 0.8mol / L); prepare 30g / L aluminum sulfate solution B, the aluminum sulfate in the solution B accounts for 0.15% of the total mass of the one-fired material H; prepare 0.1mol / L lithium silicate solution C, the silicon in the solution C Lithium acid accounts for 0.1% of the total mass of the first-fired material H;

[0069] Then prepare 4mol / L lye D (specifically sodium hydroxide solution) and 8mol / L ammonia solution E,

[0070]Mix the mixed solution A, solution B and solution C to obtain a mixed system, then add alkali solution D and solution E to the mixed system simultaneously, and react to synthesize the precursor of ternary 88, after the synthesis is completed, wash, dehydrate, and dry to obtain the precurs...

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PUM

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Abstract

The invention discloses a ternary positive electrode material doping and coating method, a ternary positive electrode material and a lithium ion battery. The method comprises the following steps: 1) preparing a ternary positive electrode material precursor by adopting silicate doped with metal source, a nickel source, a cobalt source and a manganese source through a one-stepco-precipitation method, and performing primary sintering to obtain a ternary positive electrode material core co-doped with silicon and doped metal elements; and 2) cleaning the inner core of the ternary positive electrode material by using a saturated solution of silicate as a base solution, adding metal salt in the cleaning process to perform precipitation coating, and performing secondary sintering after dehydration to obtain the doped and coated ternary positive electrode material. The method disclosed by the invention is simple to operate, the doping and coating uniformity is guaranteed, and meanwhile, the cost is properly reduced. The prepared positive electrode material is good in doping and coating effect, the problem of gas production can be effectively solved, and the cycle performance is improved.

Description

technical field [0001] The invention relates to the technical field of new energy, and relates to a method for doping and covering a ternary positive electrode material, a ternary positive electrode material and a lithium ion battery. Background technique [0002] High-nickel ternary cathode materials with high specific capacity, high cycle stability and high safety have been a research hotspot in recent years. Doping and coating modification are necessary means to realize the above-mentioned properties of high-nickel ternary cathode materials. The best doping method is to add nano-metal oxides or hydroxides and mix them uniformly before calcining, which requires additional abrasives, mixing and other processes, the operation is complicated, and the mixing effect is average; while coating is also adding nano-metal element materials to mix and sinter , the operation is equally complicated; it is difficult to guarantee the uniformity of all batches. [0003] Existing high-nic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 万江涛张宁张勇杰刘满库李子郯
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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