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Method for cladding vanadium phosphate on lithium ion battery anode material lithium cobalt nickel manganate

A technology for nickel-cobalt lithium manganate and lithium-ion batteries, which is applied in the field of high-capacity vanadium phosphate-coated lithium-ion battery cathode material nickel-cobalt manganate lithium, and can solve the problems of poor stability, low electronic conductivity, and poor ion transmission performance. question

Active Publication Date: 2017-10-03
湖南恒创睿能新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyanionic phosphate is rich in resources, high in structure and thermal stability, but has fatal defects of low electronic conductivity or poor ion transport performance; and nickel-cobalt-manganese ternary materials have high discharge specific capacity, good safety, and low price. It has the advantages of high discharge voltage, high specific energy, long cycle life, good safety and environmental friendliness; therefore, it is widely used in portable electronic products, electric vehicles and other fields; but its own shortcomings of poor stability make it unable to meet more high requirements

Method used

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  • Method for cladding vanadium phosphate on lithium ion battery anode material lithium cobalt nickel manganate
  • Method for cladding vanadium phosphate on lithium ion battery anode material lithium cobalt nickel manganate
  • Method for cladding vanadium phosphate on lithium ion battery anode material lithium cobalt nickel manganate

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Experimental program
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Effect test

Embodiment 1

[0023] The present invention comprises the following steps:

[0024] (1) Weigh 0.3183g (1.75mmol) vanadium pentoxide, 0.4026g (3.5mmol) ammonium dihydrogen phosphate, 0.4413g (3.5mmol) oxalic acid dihydrate, and mix vanadium pentoxide, ammonium dihydrogen phosphate, dihydrate Dissolve oxalic acid in 70ml of deionized water, adjust PH=5 with ammonia water, stir at 80°C for 2 hours, then place in a reaction kettle, and conduct a hydrothermal reaction at 200°C for 24 hours; after the reaction is completed, filter, wash, and dry to obtain vanadium phosphate (VPO 4 );

[0025] (2) The nickel-cobalt lithium manganate ternary cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 Add 4.75g and 0.25g of vanadium phosphate obtained in step (1) into a high-speed mixer, and stir for 2 hours at 1000rpm until a uniform product is obtained;

[0026] (3) The mixture treated in step (2) was sintered in an argon furnace at 300°C for 2 hours to obtain nickel-cobalt-lithium-manganese-cobalt-manganate...

Embodiment 2

[0035] This embodiment includes the following steps:

[0036] (1) Weigh 0.0819g (0.7mmol) ammonium metavanadate, 0.0805g (0.7mmol) diammonium hydrogen phosphate, 0.265g dihydrate oxalic acid (1.05mmol), and mix ammonium metavanadate, diammonium hydrogen phosphate, dihydrate Dissolve oxalic acid in 70ml of deionized water, adjust PH=2 with ammonia water, stir at 90°C for 4 hours to obtain a homogeneous solution, heat the obtained solution in a reaction kettle at 240°C for 48 hours; filter, wash, and dry to obtain phosphoric acid after the reaction is completed Vanadium (VPO 4 );

[0037] (2) The nickel-cobalt lithium manganate ternary cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Add 4.5g and 0.5g of vanadium phosphate obtained in step (1) into a high-speed mixer, and stir at 500rpm for 4h until a uniform product is obtained;

[0038] (3) The mixture treated in step (2) was sintered in an argon furnace at 200°C for 5 hours, and after cooling, nickel cobalt lithium manganes...

Embodiment 3

[0041] This embodiment includes the following steps:

[0042] (1) Weigh 3.1829g (0.0175mol) vanadium pentoxide, 4.0261g (0.035mol) ammonium dihydrogen phosphate, 4.4122g (0.035mol) oxalic acid dihydrate, and mix vanadium pentoxide, ammonium dihydrogen phosphate, dihydrate Dissolve oxalic acid in 70ml of deionized water, adjust PH=7 with ammonia water, stir at 80°C for 2 hours to obtain a homogeneous solution, put the obtained solution in a reaction kettle and heat it at 160°C for 48 hours; after the reaction is completed, filter, wash, and dry to obtain Vanadium Phosphate (VPO 4 );

[0043] (2) The nickel-cobalt lithium manganate ternary cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 Add 9.9g and 0.1g of vanadium phosphate obtained in step (1) into a high-speed mixer, and stir for 2 hours at 1000rpm until a uniform product is obtained;

[0044] (3) The mixture treated in step (2) was sintered in an argon furnace at 300° C. for 2 hours, and cooled to obtain nickel cobalt li...

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Abstract

The invention discloses a method for cladding vanadium phosphate on lithium ion battery anode material lithium cobalt nickel manganate. The method comprises the following steps: (1) mixing vanadate, phosphate and reducing agent in the deionized water according to the vanadium element, the phosphorus element and the reducing element, regulating pH by using ammonia water, stirring to obtain a uniform solution, reacting for 20-48h at 160-240 DEG C; filtering, washing, drying to obtain the vanadium phosphate; (2) adding the lithium cobalt nickel manganate ternary anode material and the vanadium phosphate in a high-speed mixer, wherein the vanadium phosphate mass in the obtained mixture is 1%-10% of the total mass of the mixture; stirring under a condition of 500-2000rmp to obtain a uniform product; and (3) sintering at 200-400 DEG C in an non-oxidation atmosphere, and keeping temperature for 1-5h, cooling to obtain the vanadium phosphate clad lithium ion battery anode material lithium cobalt nickel manganate. By using method disclosed by the invention, the capacity and the cyclic performance of the lithium ion battery are effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for coating nickel cobalt lithium manganese oxide, a positive electrode material of lithium ion batteries, with high specific capacity vanadium phosphate. Background technique [0002] Polyanionic phosphate is rich in resources, high in structure and thermal stability, but has fatal defects of low electronic conductivity or poor ion transport performance; and nickel-cobalt-manganese ternary materials have high discharge specific capacity, good safety, and low price. It has the advantages of high discharge voltage, high specific energy, long cycle life, good safety and environmental friendliness; therefore, it is widely used in portable electronic products, electric vehicles and other fields; but its own shortcomings of poor stability make it unable to meet more high demands. Contents of the invention [0003] The technical problem to be solved in the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/505H01M4/525H01M4/58
CPCH01M4/0416H01M4/0471H01M4/505H01M4/525H01M4/5825Y02E60/10
Inventor 郑俊超汤林波张宝王鹏博肖彬童汇喻万景张佳峰
Owner 湖南恒创睿能新能源科技有限公司
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