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A kind of high-nickel composite cathode material and its preparation method and application

A composite cathode material and high-nickel technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., to achieve the effects of large-scale promotion, good cycle stability and capacity retention, and inhibition of formation

Active Publication Date: 2022-04-15
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above method improves the performance of high-nickel cathode materials through coating modification, but the coating method and the choice of coating will have different effects on the uniformity, gram capacity, and discharge voltage platform of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a high-nickel composite positive electrode material, the composite positive electrode material is composed of an inner core and a cladding layer, and the molecular formula of the inner core is LiNi 0.8 co 0.1 mn 0.1 o 2 , the coating layer is toluenesulfonic acid, the thickness of the coating layer is 250nm, and the mass is 4% of the composite positive electrode material.

[0033] Prepare the high-nickel composite positive electrode material according to the following method:

[0034] (1) LiNi with a particle size of 20 μm 0.8 co 0.1 mn 0.1 o 2 Solid phase mixing with p-toluenesulfonic acid by manual grinding;

[0035] (2) Put the mixture obtained in step (1) in a tube furnace, raise the temperature to 350° C. for 3 hours at a rate of 1° C. / min under a nitrogen atmosphere, and cool down to room temperature with the furnace to obtain the composite positive electrode material.

[0036] The obtained composite material was used as the positi...

Embodiment 2

[0038] This embodiment provides a high-nickel composite positive electrode material, the composite positive electrode material is composed of an inner core and a cladding layer, and the molecular formula of the inner core is LiNi 0.7 co 0.2 al 0.1 o 2 , the coating layer is ethylsulfonic acid and sodium dodecylbenzenesulfonate, the thickness of the coating layer is 500nm, and the mass is 20% of the composite positive electrode material.

[0039] Prepare the high-nickel composite positive electrode material according to the following method:

[0040] (1) LiNi with a particle size of 4 μm 0.7 co 0.2 al 0.1 o 2 Solid phase mixing with ethylsulfonic acid and sodium dodecylbenzenesulfonate by manual grinding;

[0041] (2) Put the mixture obtained in step (1) in a tube furnace, and in a nitrogen atmosphere, raise the temperature to 250°C at a rate of 20°C / min and keep it warm for 10h, and then cool to room temperature under program control to obtain the composite positive ele...

Embodiment 3

[0044] This embodiment provides a high-nickel composite positive electrode material, the composite positive electrode material is composed of an inner core and a cladding layer, and the molecular formula of the inner core is LiNi 0.6 mn 0.4 o 2 , the coating layer is ethylsulfonic acid, the thickness of the coating layer is 200nm, and the mass is 0.5% of the composite positive electrode material.

[0045] Prepare the high-nickel composite positive electrode material according to the following method:

[0046] (1) LiNi with a particle size of 1 μm 0.6 mn 0.4 o 2 Solid phase mixing with ethylsulfonic acid by means of ball milling;

[0047] (2) Put the mixture obtained in step (1) in a tube furnace, and in an argon atmosphere, raise the temperature to 600°C at a rate of 30°C / min and keep it for 1h, and then cool to room temperature under program control to obtain the composite positive electrode Material.

[0048] The obtained composite material was used as the positive el...

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Abstract

The invention relates to a high-nickel composite positive electrode material and its preparation method and application. The composite positive electrode material is composed of an inner core and a coating layer, and the molecular formula of the inner core is LiNi x m 1‑x o 2 , wherein, M is at least one of Mn, Co or Al, and 0.5≤x<1; the cladding layer contains -SO 3 H-functional acids and / or containing ‑SO 3 Derivatives of acids with H functional groups, the general formula is R‑SO 3 H. The present invention selects and contains-SO 3 H-functional acids and / or containing ‑SO 3 The acid derivatives of the H functional group are used to coat and modify the high-nickel positive electrode material, which solves the problem of residual alkali on the surface, and at the same time inhibits the formation of lithium carbonate, and improves the gas phenomenon of the battery during high-voltage charging and discharging. The obtained high-nickel positive electrode material has excellent storage performance, and can still maintain good cycle stability and capacity retention at a relatively high voltage.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a high-nickel composite cathode material and a preparation method and application thereof. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. Among them, the positive electrode material is currently the main factor limiting battery performance, and it is also the main factor accounting for the high cost of lithium-ion batteries, which is close to 40%. [0003] High-nickel cathode materials have high specific capacity and good cycle performance, and are currently the mainstream cathode materials for development. In high-nickel cathode materials, increasing the content of nickel in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 谭强强夏青
Owner LANGFANG GREEN IND TECH CENT
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