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

A cathode material and modification technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as poor structural stability and poor high-temperature cycle performance, and achieve improved electrical conductivity, improved structural stability and Lithium intercalation reversibility and the effect of reducing the shuffling phenomenon

Pending Publication Date: 2022-04-12
HEFEI RONGJIE ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the performance requirements of lithium-ion batteries are getting higher and higher, high specific capacity and high charge-discharge efficiency become necessary requirements, but the existing nickel-cobalt lithium manganese oxide cannot meet the requirements
The current conventional method is to modify nickel-cobalt-lithium manganese oxide by means of doping or coating, so as to improve its specific capacity and charge-discharge efficiency, but there are still problems of poor structural stability and poor high-temperature cycle performance.

Method used

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

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preparation example Construction

[0026] The first aspect of the present invention provides a modified ternary positive electrode material and a preparation method thereof, which mainly includes the following steps:

[0027] S100, preparing calcined material

[0028] Specifically, after mixing nickel-cobalt-manganese hydroxide and boric acid uniformly, pre-sintering is carried out to obtain pre-sintered material; The precursor of the nickel-cobalt-manganese ternary cathode material is not particularly limited, and its composition is Ni x co y mn 1-x-y (OH) 2 , where 0.3≤x≤0.8, 0≤y≤0.3. By mixing boric acid with the precursor and then pre-sintering, the boric acid is decomposed into boron oxide and then melted and doped into the precursor at high temperature, and pre-sintered with the precursor to better combine, improving the structural stability and reversibility of lithium intercalation. In one or more embodiments of the present invention, the quality of boric acid is 0.1%-1% of the quality of the nic...

Embodiment 1

[0037] The ternary positive electrode material in this embodiment uses boron-doped nickel-cobalt-manganese ternary positive electrode material as the base material, and introduces titanium ion doping at the same time, forming a lithium fluoride coating layer on its surface. The specific preparation steps are as follows:

[0038] Take 100g of NCM523 precursor (D50 = 5.43μm) and 0.13g of boric acid, mix them evenly, put them into a box furnace, raise the temperature to 600°C at a heating rate of 5°C / min and keep it warm for 6h, during which the air flow rate is 200ml / min , after the sintering is completed, the temperature is naturally lowered to obtain the pre-fired material;

[0039]Take 50g of the pre-fired material, mix it with 22g of battery-grade lithium carbonate and 0.2g of titanium dioxide, and then put it into the furnace, raise the temperature to 800°C at a heating rate of 5°C / min and keep it for 6 hours, then increase the temperature at 2°C / min Raise the temperature t...

Embodiment 2

[0059] The ternary positive electrode material in this embodiment uses boron-doped nickel-cobalt-manganese ternary positive electrode material as the base material, and introduces titanium ion doping at the same time, forming a lithium fluoride coating layer on its surface. The specific preparation steps are as follows:

[0060] Take 100g of NCM523 precursor (D50 = 4.03μm) and 0.16g of boric acid, mix them evenly, put them into a box furnace, raise the temperature to 650°C at a heating rate of 5°C / min and keep it warm for 6h, during which the air flow rate is 200ml / min , after the sintering is completed, the temperature is naturally lowered to obtain the pre-fired material;

[0061] Take 50g of the pre-fired material, mix it with 23g of battery-grade lithium carbonate and 0.22g of titanium dioxide, and then put it into the furnace, raise the temperature to 800°C at a heating rate of 5°C / min and keep it for 6 hours, then increase the temperature at 2°C / min Raise the temperature...

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Abstract

The invention discloses a modified ternary positive electrode material and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing nickel-cobalt-manganese hydroxide and boric acid, and pre-sintering to obtain a pre-sintered material; uniformly mixing the pre-sintered material with a lithium source and a cationic additive, and performing primary sintering to obtain a ternary sintered material; and uniformly mixing the ternary sintered material with an anionic coating agent, and carrying out secondary sintering to prepare the modified ternary positive electrode material. The modified ternary positive electrode material has high structural stability and capacity and excellent high-temperature cycle performance. The invention also discloses a lithium ion battery containing the modified ternary positive electrode material, and the lithium ion battery has excellent electrical properties.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, in particular to a modified ternary cathode material and a preparation method thereof, and also relates to a lithium ion battery comprising the modified ternary cathode material. Background technique [0002] As one of the key materials of lithium-ion batteries, cathode materials play a vital role in the performance of lithium-ion batteries. At present, the commonly used cathode materials for lithium-ion batteries mainly include lithium cobalt oxide, lithium iron phosphate, and ternary materials. Nickel and manganese replace more than two-thirds of the cobalt in lithium cobalt oxide, so the cost advantage is very obvious; and compared with other lithium ion battery cathode materials lithium manganese oxide and lithium iron phosphate, nickel cobalt lithium manganese oxide material It is very close to lithium cobalt oxide in terms of electrochemical performance and pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
Inventor 袁争朱二涛戴吴月胡刚刚吴胜坤刘克帆李刚
Owner HEFEI RONGJIE ENERGY MATERIALS CO LTD
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