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Preparation method of ternary material coated with orthosilicate positive electrode material

A positive electrode material, ternary material technology, applied in positive electrode, chemical instruments and methods, manganate/permanganate, etc., can solve the problem of extensive input method of additive input, limit the actual performance of coating material, and rarely. Considering problems such as joint processing, it can achieve the effect of improving the high cost of wet method, improving surface active sites, and easy industrialization and application.

Active Publication Date: 2020-09-22
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent only quantifies the amount of coating, and other key indicators are not mentioned, and the mixing method has a great influence on the coating effect. Conventional methods or mixing effects are poor, and coating uniformity is difficult to guarantee
Or the cost is high, which limits the actual performance of the cladding material
Moreover, positive electrode materials, especially high-nickel products, in order to prepare products with excellent performance, often need to be sintered with an excessive amount of lithium source before sintering. This synthesis route often leads to excessive residual lithium on the surface, and the general residual content is 0.5~ 5%, which will affect the subsequent battery manufacturing process. Joint treatment is rarely considered in the treatment of residual lithium on the surface, and the input amount and input method of additives are also relatively extensive.

Method used

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  • Preparation method of ternary material coated with orthosilicate positive electrode material
  • Preparation method of ternary material coated with orthosilicate positive electrode material
  • Preparation method of ternary material coated with orthosilicate positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Dissolve nickel salt, cobalt salt, and manganese salt in water respectively, mix according to the molar ratio of 6:2:2, and adopt the method of co-precipitation to obtain the hydroxide containing three metal salts; according to the molar ratio of lithium metal Li:M 总 = 1.05, the lithium salt is mixed with the precursor, sintered and pulverized to obtain the corresponding ternary cathode material, which is designated as sample 1. Sample 1 was tested for the residual lithium content on the surface, and the residual lithium content and composition information were accurately determined. According to the molar ratio Li: (Si+M) = 0.8:1, add lithium source and additives, the particle size of the additives is 500nm, fluidized mixing for 30min, press at 0.10MPa for tableting, sintering (SJ2) temperature is 600°C , denoted as sample 2. Sample 2 was tested for surface residual lithium and additive (Si+M) content, and the residual lithium content and composition information were ...

Embodiment 2

[0053] Dissolve nickel salt, cobalt salt, and manganese salt in water respectively, mix according to the molar ratio of 6:2:2, and adopt the method of co-precipitation to obtain the hydroxide containing three metal salts; according to the molar ratio of lithium metal Li:M 总 = 1.05, the lithium salt is mixed with the precursor, sintered and pulverized to obtain the corresponding ternary cathode material, which is designated as sample 21. Sample 21 was tested for the residual lithium content on the surface, and the residual lithium content and composition information were accurately determined. According to the molar ratio Li:(Si+M)=0.6:1, add lithium source and additives, the particle size of the additives is 800nm, fluidized mixing for 30min, press at 0.10MPa for tableting, sintering (SJ2) temperature is 600℃ , denoted as sample 22. Sample 22 was tested for surface residual lithium and additive (Si+M) content, and the residual lithium content and composition information were ...

Embodiment 3

[0055] Dissolve nickel salt, cobalt salt, and manganese salt in water respectively, mix according to the molar ratio of 6:2:2, and adopt the method of co-precipitation to obtain the hydroxide containing three metal salts; according to the molar ratio of lithium metal Li:M 总= 1.05, the lithium salt is mixed with the precursor, sintered and pulverized to obtain the corresponding ternary cathode material, which is designated as sample 31. Sample 31 was tested for the residual lithium content on the surface, and the residual lithium content and composition information were accurately determined. According to the molar ratio Li:(Si+M)=0.5:1, add lithium source and additives, the particle size of additives is 500nm, fluidized mixing for 30min, press at 0.10MPa for tableting, sintering (SJ2) temperature is 600℃ , denoted as sample 32. Sample 32 was tested for surface residual lithium and additive (Si+M) content, and the residual lithium content and composition information were accur...

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Abstract

The invention discloses a preparation method of a ternary material coated with an orthosilicate positive electrode material. The chemical composition general formula of the orthosilicate positive electrode material is Li2MSiO4 (M is at least one of Fe, Mn, Co and Ni). The coating content of the orthosilicate positive electrode material accounts for 0.01-10% of the mass fraction of the positive electrode material, and the thickness of a coating layer is 10-1000 nm. The method comprises the following steps: measuring the content and components of residual lithium on the surface of the ternary material, adding a nanoscale lithium source, a corresponding metal M source, a silicon source and the like according to the coating content and the molecular molar ratio, carrying out fluidized mixing,tabletting, sintering, pulverizing, and screening to obtain the ternary positive electrode material coated with the orthosilicate positive electrode material. The method is a pure dry process, the preparation method is simple and easy to implement, the overcharge resistance and thermal stability of the ternary material can be improved while the residual lithium on the surface is reduced, the electrical property of the material is improved, and the method has a certain industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials and preparation thereof, and in particular relates to a preparation method for orthosilicate-based cathode materials dry-coated ternary materials. Background technique [0002] With the rapid development of 3C digital electronic products, electric tools and electric vehicles, the requirements for batteries are getting higher and higher, and among the key technologies restricting the development of batteries, cathode material technology is a key link. In the actual sintering production of positive electrode materials, especially medium-high nickel ternary materials, due to the volatilization of lithium, in order to obtain a better crystal structure, an excessive amount of lithium source is often added, so that residual lithium often exists on the surface of the product. Residual lithium refers to lithium oxides, hydroxides, and carbonates on the surface of ternary mate...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G51/00C01G49/00C01G45/12H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/44C01G53/42C01G51/42C01G51/44C01G49/009C01G45/1214H01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028C01P2004/80C01P2004/03C01P2006/12C01P2006/40Y02E60/10
Inventor 余柏烈魏国祯曾雷英
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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