Encapsulated ternary positive electrode material, preparation method thereof and lithium ion battery

A technology of positive electrode materials and positive electrode active materials, which is applied in the field of new energy, can solve the problems of high nickel material gas production, etc., achieve good cycle stability and safety performance, high first effect, and ensure the effect of normal release

Active Publication Date: 2021-08-06
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 methods also have certain deficiencies, and the problem of high-nickel materials producing more gas still exists

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment provides a coated ternary positive electrode material, comprising a ternary positive electrode active material core co-doped with aluminum, zirconium and fluorine and a cladding layer coated on the surface of the core core, the cladding layer comprising phosphoric acid Hydrogen zirconium and boron compound, said boron compound is boron oxide and lithium borate;

[0058] Wherein, based on the total mass of the inner core, the total mass concentration of aluminum, zirconium and fluorine is 3000ppm, the mass concentration of the cladding layer is 3500ppm, and the mass proportion of the zirconium hydrogen phosphate in the cladding layer is 57%.

[0059] The preparation method of the above-mentioned coated ternary positive electrode material comprises 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 8:1:1 to prepare nickel-cobalt-manganese terna...

Embodiment 2

[0067] This embodiment provides a coated ternary positive electrode material, comprising a ternary positive electrode active material core co-doped with aluminum, zirconium and fluorine and a cladding layer coated on the surface of the core core, the cladding layer comprising phosphoric acid Hydrogen zirconium and boron compound, said boron compound is boron oxide and lithium borate;

[0068] Wherein, based on the total mass of the inner core, the total mass concentration of aluminum, zirconium and fluorine is 5000ppm, the mass concentration of the cladding layer is 4000ppm, and the mass proportion of the zirconium hydrogen phosphate in the cladding layer is 75%.

[0069] The preparation method of the above-mentioned coated ternary positive electrode material comprises the following steps:

[0070] 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 ter...

Embodiment 3

[0077] This embodiment provides a coated ternary positive electrode material, comprising a ternary positive electrode active material core co-doped with aluminum, zirconium and fluorine and a cladding layer coated on the surface of the core core, the cladding layer comprising phosphoric acid Hydrogen zirconium and boron compound, said boron compound is boron oxide and lithium borate;

[0078] Wherein, based on the total mass of the inner core, the total mass concentration of aluminum, zirconium and fluorine is 4000ppm, the mass concentration of the cladding layer is 2700ppm, and the mass proportion of the zirconium hydrogen phosphate in the cladding layer is 74%.

[0079] The preparation method of the above-mentioned coated ternary positive electrode material comprises the following steps:

[0080] 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 ter...

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PUM

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Abstract

The invention discloses a coated ternary cathode material, a preparation method thereof and a lithium ion battery. The coated ternary positive electrode material includes a ternary positive electrode active material core co-doped with aluminum, zirconium and fluorine and a coating layer coated on the surface of the core core, and the coating layer includes zirconium hydrogen phosphate and a boron compound . In the coated ternary positive electrode material of the present invention, the ternary positive electrode material is co-doped with aluminum, zirconium and fluorine, and co-coated with zirconium hydrogen phosphate and boron compound, which can effectively solve the gas production problem of the positive electrode material. Improve safety performance; at the same time, it can ensure good conductivity and structural stability of the material, ensure the normal release of electrochemical properties, and have high discharge capacity, high first effect, good cycle stability and safety performance.

Description

technical field [0001] The invention relates to the technical field of new energy, and relates to a coated ternary positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] High-nickel ternary cathode materials have attracted the attention of the new energy industry in recent years because of their high specific capacity and low cost of raw materials. Although research has found that this material generally has some defects, many companies still recommend high-nickel ternary batteries. One of the more serious key issues is that more gas is produced after being made into batteries, which affects the safety and cycle life of the batteries. One of the most important reasons for gas production is that the high-nickel cathode material has strong reactivity. It releases oxygen during charging and discharging and directly contacts with the electrolyte. During the charging process, the unstable chemical reaction occurs and gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/624H01M4/626H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10H01M4/366
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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