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Composite outer coating positive electrode material and preparation method thereof, positive electrode and lithium ion battery

A positive electrode material and outer coating technology, which is applied in the composite outer coated positive electrode material and its preparation, in the field of positive electrodes and lithium-ion batteries, can solve the problems of high residual alkali, large specific energy, and unsuitable cost control.

Active Publication Date: 2022-02-25
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ternary nickel-cobalt-manganese high-nickel cathode material has high specific energy and high working voltage. It has certain advantages in the field of lithium-ion batteries, but there are still some technical deficiencies, among which the problem of safe gas production is a more prominent problem. In response to this problem, material experts in the industry have carried out various coating modification studies on the existing high-nickel ternary cathode materials. These newly developed processes can partially solve the above problems, but there are also some shortcomings.
For example: Some processes cover rare earth elements and rare elements, which is difficult to achieve mass production; some processes have a high coating temperature, which is not suitable for cost control; some processes use multiple sintering and coating, and the operation is more complicated
Moreover, due to the common problem of high residual alkali in high-nickel ternary sintering, it is necessary to increase the process steps of water washing to remove residual alkali, which makes the preparation of ternary positive electrode materials extremely complicated.

Method used

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  • Composite outer coating positive electrode material and preparation method thereof, positive electrode and lithium ion battery
  • Composite outer coating positive electrode material and preparation method thereof, positive electrode and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Precursor synthesis: Weigh nickel sulfate (99%), cobalt sulfate (99%) and manganese sulfate (99%) crystalline powder according to the molar ratio of nickel, cobalt, and manganese as 7:1:2, and mix and dissolve them in Prepare nickel-cobalt-manganese ternary mixture A with a total concentration of 0.5-1.5mol / L with water, then prepare 6mol / L sodium hydroxide lye B, and 9mol / L ammonia solution C to simultaneously add nickel-cobalt-manganese ternary mixture In A, the ternary 712 precursor is synthesized by reaction. After the synthesis is completed, it is washed, dehydrated, and dried to obtain the finished precursor. The D50 particle size of the finished precursor is about 10 microns.

[0067] First firing of the positive electrode: Weigh a certain amount of the precursor product D and lithium hydroxide E for high-mixer mixing. The precursor and lithium hydroxide are fully mixed at a mass ratio of 1:1.05. Under an oxygen atmosphere, at 950 Calcined for 12 hours at a tempe...

Embodiment 2

[0073] Precursor synthesis: Weigh nickel nitrate (99%), cobalt nitrate (99%) and manganese nitrate (99%) crystalline powders according to the molar ratio of nickel, cobalt, and manganese as 8:1:1, and mix and dissolve them in Water is prepared to obtain a nickel-cobalt-manganese ternary mixture A with a total concentration of 0.5-1.5mol / L, and then 7mol / L sodium hydroxide lye B is prepared, and 10mol / L ammonia solution C is simultaneously added to the nickel-cobalt-manganese ternary mixture React in liquid A to synthesize the ternary 811 precursor. After the synthesis is completed, wash, dehydrate, and dry to obtain the finished precursor. The D50 particle size of the finished precursor is about 10 microns.

[0074] First firing of the positive electrode: Weigh a certain amount of the precursor product D and lithium hydroxide E for high-mixer mixing. The precursor and lithium hydroxide are fully mixed at a mass ratio of 1:1.04. Under an oxygen atmosphere, at 850 degrees Celsius...

Embodiment 3

[0080] Precursor synthesis: take nickel chloride (99%), cobalt chloride (99%) and manganese chloride (99%) crystalline powder according to the molar ratio of nickel, cobalt, manganese is 88:9:3, and its Mix and prepare the nickel-cobalt-manganese ternary mixture A with a total concentration of 0.5-1.5mol / L, then prepare 8mol / L sodium hydroxide lye B and 8mol / L ammonia solution C and simultaneously add nickel-cobalt-manganese ternary mixture React in liquid A to synthesize the ternary 88 precursor. After the synthesis is completed, wash, dehydrate, and dry to obtain the finished precursor. The D50 particle size is about 10 microns.

[0081] First firing of the positive electrode: Weigh a certain amount of the precursor finished product D and lithium hydroxide E for high-mixer mixing. The precursor and lithium hydroxide are fully mixed at a mass ratio of 1:1.03. Under an oxygen atmosphere, at 750 Calcined for 12 hours at a temperature of 100 degrees Celsius to obtain a fired mat...

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Abstract

The invention provides a composite outer coating positive electrode material and a preparation method thereof, a positive electrode and a lithium ion battery. The composite outer coating positive electrode material comprises: positive electrode material particles; a composite coating layer, the composite coating layer is a single-layer structure, Coated on at least part of the outer surface of the positive electrode material particles, and the composite coating layer contains lithium, nickel, cobalt, manganese and boron elements. In the composite outer coating positive electrode material, while effectively improving the gas production problem, the composite coating layer optimizes the disadvantages of a single coating layer such as poor electrical conductivity, incomplete coating, reduced capacity and first effect, and reduces The sintering temperature is improved, and the residual alkali amount of the final product is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular, to a composite outer-coated positive electrode material and a preparation method thereof, a positive electrode and a lithium-ion battery. Background technique [0002] With its advantages of high specific energy, long cycle life, no memory effect, safety and reliability, and fast charging and discharging, lithium-ion batteries have become a bright spot in the research of new energy power supply technology. At present, they have been widely used in portable electronic products, and gradually Occupy the new energy vehicle power supply market. [0003] The ternary nickel-cobalt-manganese high-nickel cathode material has high specific energy and high working voltage. It has certain advantages in the field of lithium-ion batteries, but there are still some technical deficiencies, among which the problem of safe gas production is a more prominent problem. In response to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M4/626H01M4/131H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 万江涛任海朋张勇杰张宁崔胜弼
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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