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Positive electrode material coated with phosphorus-containing compound and preparation method of positive electrode material

A technology of positive electrode materials and compounds, applied in the field of positive electrode materials coated with phosphorus-containing compounds and its preparation, can solve the problems of reducing the capacity of positive electrode materials, uneven coating and mixing, and difficult control of the coating amount, and achieve low material cost, The effect of wide equipment operation window and less material

Active Publication Date: 2020-08-07
XIAMEN YUNMAO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, first of all this dry coating mix is ​​uneven
Secondly, the amount of dry coating is not easy to control, and the amount added is too large. If the coating is too thick, a large amount of inactive substances will be introduced into the positive electrode material, which will further reduce the capacity of the positive electrode material.

Method used

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  • Positive electrode material coated with phosphorus-containing compound and preparation method of positive electrode material
  • Positive electrode material coated with phosphorus-containing compound and preparation method of positive electrode material
  • Positive electrode material coated with phosphorus-containing compound and preparation method of positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In this example, phosphorus oxide-coated high-nickel ternary material is taken as an example:

[0055] S1, put the high-nickel ternary material into the reaction chamber of the atomic layer deposition equipment, set the reaction temperature to 250°C, and keep it for 2 hours;

[0056] S2, in this embodiment, trimethyl phosphate is used as precursor A, and trimethyl phosphate is passed into the reaction chamber, the pressure is set to 5torr, and the reaction time is 50s;

[0057] S3, pass into N 2 Excessive trimethyl phosphate and by-products are purged, and the purging time is 50s;

[0058] S4, this embodiment uses H 2 O is used as the precursor B, and H is introduced into the reaction chamber 2 O, the pressure is set to 5torr, and the response time is 50s;

[0059] S5, pass into N 2 to purge the excess H 2 O and by-products, the purge time is 50s;

[0060] S6, repeating steps S2 to S5 50 times to obtain a positive electrode material uniformly coated with 10nm pho...

Embodiment 2

[0063] This example takes phosphorus oxide coated lithium cobalt oxide material as an example:

[0064] S1, put the lithium cobalt oxide material into the reaction chamber of the atomic layer deposition equipment, set the reaction temperature to 300°C, and keep the time for 2h;

[0065] S2, in this embodiment, trimethyl phosphate is used as precursor A, and trimethyl phosphate is passed into the reaction chamber, the pressure is set to 5torr, and the reaction time is 50s;

[0066] S3, pass into N 2 Excessive trimethyl phosphate and by-products are purged, and the purging time is 50s;

[0067] S4, this embodiment uses O 3 As precursor B, feed O into the reaction chamber 3 , the pressure is set to 5torr, and the response time is 50s;

[0068] S5, pass into N 2 to purge the excess O 3 and by-products, the purge time is 50s;

[0069] S6, repeating steps S2 to S5 50 times to obtain a positive electrode material uniformly coated with 10nm phosphorus oxide;

[0070] S7, the p...

Embodiment 3

[0072] This example takes phosphorus oxide-coated high-nickel ternary material as an example:

[0073] S1, select the high-nickel ternary material coated with Al by mechanical fusion method and put it into the reaction chamber of the atomic layer deposition equipment, set the reaction temperature to 200°C, and the holding time to 2.0h;

[0074] S2, in this embodiment, trimethyl phosphate is used as precursor A, and trimethyl phosphate is passed into the reaction chamber, the pressure is set to 5torr, and the reaction time is 50s;

[0075] S3, pass into N 2 Excessive trimethyl phosphate and by-products are purged, and the purging time is 50s;

[0076] S4, this embodiment uses O 3 As precursor B, feed O into the reaction chamber 3 , the pressure is set to 5torr, and the response time is 50s;

[0077] S5, pass into N 2 to purge the excess O 3 and by-products, the purge time is 50s;

[0078] S6, repeating steps S2 to S5 50 times to obtain a positive electrode material unifo...

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Abstract

The invention provides a positive electrode material coated with a phosphorus-containing compound and a preparation method of the positive electrode material, and relates to a positive electrode material of a lithium battery. The preparation method comprises the following steps: coating the surface of a positive electrode material with a phosphorus-containing compound layer through an atomic layerdeposition method, wherein the phosphorus-containing compound in the phosphorus-containing compound layer is one or more of phosphorus oxide, phosphorus nitride and phosphorus oxynitride. The coatingthickness can be accurately controlled through atomic layer deposition, and a uniform protective layer is formed. The deposited phosphorus-containing compound reacts with residual lithium on the surface of the positive electrode material to generate a fast ion conductor substance, so that the residual lithium on the surface of the positive electrode material is reduced, the phosphorus-containingfast ion conductor can reduce the interface impedance, and the material performance is improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium batteries, and in particular to a positive electrode material coated with phosphorus-containing compounds and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, power tools, electric vehicles and other fields. And with the development of science and technology, people put forward higher requirements for the energy density, cycle performance and safety performance of lithium-ion batteries. The positive electrode material of lithium-ion batteries directly determines the energy density and cycle performance of lithium-ion batteries to a certain extent. Among them, the layered structure nickel-cobalt-lithium-manganese-oxide ternary material, compared with lithium cobaltate, lithium manganate, and lithium nickelate, has higher specific capacity, good cycle performance, strong thermal stability, ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525C23C16/40C23C16/455C23C16/52C23C16/56
CPCH01M4/364H01M4/525H01M4/485H01M10/0525C23C16/45527C23C16/56C23C16/52C23C16/40H01M2004/028Y02E60/10
Inventor 陈斌雷植深刘彦峰王韫宇
Owner XIAMEN YUNMAO TECH CO LTD
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