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Gradient coated LiNiO2 material and preparation method

A lithium nickelate and gradient technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of rapid capacity decay and poor thermodynamic stability of lithium nickelate, improve cycle performance and thermodynamic stability, solve instability, good compatibility

Inactive Publication Date: 2013-05-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a lithium nickelate material and a preparation method thereof, and the successful preparation of the material of the invention can effectively solve the problems of rapid capacity decay and poor thermodynamic stability of the existing lithium nickelate

Method used

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  • Gradient coated LiNiO2 material and preparation method
  • Gradient coated LiNiO2 material and preparation method
  • Gradient coated LiNiO2 material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare 0.5mol / L nickel sulfate solution, 0.8mol / L cobalt manganese sulfate solution (cobalt manganese ratio is 1:1), 3mol L -1 sodium hydroxide solution and 0.5mol L -1 of ammonia solution. The three solutions of nickel sulfate, sodium hydroxide and ammonia water were simultaneously fed into the reaction kettle through the dosage pump at a flow rate of 1.5 L / h by a peristaltic pump, and the reaction temperature was kept at 30°C with continuous stirring, while the reaction was controlled at pH=12. There is a large amount of green Ni(OH) at the beginning of the reaction 2 Precipitation formed. The reaction lasts for a period of time until 90% NiSO 4 After the solution is consumed, the cobalt-manganese sulfate mixed ion solution is continuously input into the nickel sulfate solution, and stirred and mixed. Then the formed new mixed ion solution is continuously input into the reactor to continue the precipitation. After the dropwise addition of the mixed solution was ...

Embodiment 2

[0049] First prepare 1mol / L nickel sulfate solution, 0.7mol / L cobalt manganese aluminum sulfate solution (cobalt manganese aluminum ratio is 1:1:1:0.5), 1mol L -1 sodium hydroxide solution and 0.5mol L -1 of ammonia solution. The three solutions of nickel sulfate, sodium hydroxide and ammonia water were simultaneously fed into the reactor by a peristaltic pump at a flow rate of 1.5 L / h, and the reaction temperature was kept at 40°C with continuous stirring, while the reaction was controlled at pH=11. There is a large amount of green Ni(OH) at the beginning of the reaction 2 Precipitation formed. The reaction continues for a period of time until 70% NiSO 4 After the solution is consumed, the mixed ion solution of cobalt, manganese and aluminum sulfate is continuously input into the nickel sulfate solution, and stirred and mixed. At the same time, the formed new mixed ion solution is continuously input into the reactor to continue the precipitation. After the dropwise addit...

Embodiment 3

[0051] First prepare 2mol / L nickel sulfate solution, 0.5mol / L cobalt manganese sulfate solution (cobalt manganese ratio is 1:2), 1mol L -1 sodium hydroxide solution and 0.1mol L -1 of ammonia solution. The three solutions of nickel sulfate, sodium hydroxide and ammonia water were simultaneously input into the reaction kettle through the dosage pump at a flow rate of 1.5 L / h by a peristaltic pump, and the reaction temperature was kept at 30°C with continuous stirring, while the reaction was controlled at pH=10. There is a large amount of green Ni(OH) at the beginning of the reaction 2 Precipitation formed. The reaction continues for a period of time until 50% NiSO 4 After the solution is consumed, the cobalt-manganese sulfate mixed ion solution is continuously input into the nickel sulfate solution, and stirred and mixed. At the same time, the formed new mixed ion solution is continuously input into the reactor to continue the precipitation. After the dropwise addition of ...

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Abstract

The invention discloses a preparation method for gradient coated LiNiO2 for lithium ion battery positive pole material, so as to solve the problem of bad circulating performance of conventional LiNiO2. The molecular formula of the LiNiO2 is LiNi 1-xMxO2, wherein, the x is less than or equal to 0.3 and greater than 0, the M is adulterated metal ions and is one or more selected from magnesium, nickel, Fe, titanium, zinc, Co, manganese, aluminum, Nb and vanadium, the gradient coat refers to that concentration gradient hydroxide coprecipitate provided with nickel and other metallic elements is coated on the surfaces of spherical nickelous hydroxide material, and then the precursor is mixed with lithium-source material and roasted under high temperature in an oxygen atmosphere furnace, so as to obtain high-performance modified LiNiO2. The gradient coated LiNiO2 obtained in the invention has the characteristics of high specific capacity, excellent circulating performance, excellent high-temperature property and the like, and is suitable for the application field of high- capacity lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a preparation method of a special gradient-coated lithium nickelate material. In this special lithium nickelate material, the nickel content gradually decreases from the inside to the outside at a certain radius, while the content of the coating element gradually increases. Background technique [0002] As a green secondary battery, lithium-ion batteries have the advantages of light weight, small size, high discharge platform, large capacity, long cycle life, and no memory effect. They have been widely used in mobile electronic appliances such as mobile phones, cameras, and notebook computers. , At the same time, it is increasingly used in artificial satellites, aerospace, electric vehicles and other fields. [0003] In lithium-ion batteries, the cathode material is the key to performance and cost, among which layered LiNiO 2 Due to its high discharge spe...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122Y02E60/10
Inventor 胡国荣杜柯黄金龙彭忠东曹雁冰
Owner CENT SOUTH UNIV
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