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Ternary positive pole material with surface layer coated with lithium tungstate and doped with W and preparation method

A technology for coating lithium tungstate and positive electrode materials, which is applied to electrical components, battery electrodes, electrochemical generators, etc., can solve the problems of unstable surface structure, poor material cycle performance, etc., and achieves low production cost, simple method, Simple preparation method

Inactive Publication Date: 2019-05-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the high-nickel ternary positive electrode material has poor overall cycle performance due to the unstable surface structure in the cycle process, the purpose of the present invention is to provide a ternary positive electrode material coated with lithium tungstate and doped with W on the surface and Preparation

Method used

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  • Ternary positive pole material with surface layer coated with lithium tungstate and doped with W and preparation method
  • Ternary positive pole material with surface layer coated with lithium tungstate and doped with W and preparation method
  • Ternary positive pole material with surface layer coated with lithium tungstate and doped with W and preparation method

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Experimental program
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Effect test

Embodiment 1

[0059] Weigh NiSO according to the molar ratio Ni:Co:Mn=8:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use deionized water to prepare a mixed salt solution with a total concentration of Ni, Co, and Mn ions of 2mol / L, and then use deionized water to prepare NaOH and ammonia water with the same concentration.

[0060] Add 50 mL of deionized water into the reaction kettle as the reaction base solution, and add ammonia water to adjust the pH to 11±0.2. The stirring speed was controlled at 600 r / min, and the reaction temperature was controlled at 55°C. Pump the mixed salt solution and ammonia water into the reaction kettle at a speed of 0.4ml / min, and at the same time adjust the feeding speed of the sodium hydroxide solution to stabilize the pH at 11±0.2, the feeding time is 4h, and continue to feed argon after the feeding is completed Stir with air for 4h. After the reaction is completed, the precipitate is filtered, washed and dried with deionized water to prepare the ...

Embodiment 2

[0064] Weigh NiSO according to the molar ratio Ni:Co:Mn=8:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use deionized water to prepare a mixed salt solution with a total concentration of Ni, Co, and Mn ions of 2mol / L, and then use deionized water to prepare NaOH and ammonia water with the same concentration.

[0065] Add 50 mL of deionized water into the reaction kettle as the reaction base solution, and add ammonia water to adjust the pH to 11±0.2. The stirring speed was controlled at 600 r / min, and the reaction temperature was controlled at 55°C. Pump the mixed salt solution and ammonia water into the reaction kettle at a speed of 0.4ml / min, and at the same time adjust the feeding speed of the sodium hydroxide solution to stabilize the pH at 11±0.2, the feeding time is 4h, and continue to feed argon after the feeding is completed Stir with air for 4h. After the reaction is completed, the precipitate is filtered, washed and dried with deionized water to prepare the ...

Embodiment 3

[0069] Weigh NiSO according to the molar ratio Ni:Co:Mn=8:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, use deionized water to make the total concentration of Ni, Co, Mn ions is 2mol L -1 The mixed salt solution, and then prepare the same concentration of NaOH and ammonia with deionized water.

[0070] Add 50 mL of deionized water into the reaction kettle as the reaction base solution, and add ammonia water to adjust the pH to 11±0.2. The stirring speed was controlled at 600 r / min, and the reaction temperature was controlled at 55°C. Pump the mixed salt solution and ammonia water into the reaction kettle at a speed of 0.4ml / min, and at the same time adjust the feeding speed of the sodium hydroxide solution to stabilize the pH at 11±0.2, the feeding time is 4h, and continue to feed argon after the feeding is completed Stir with air for 4h. After the reaction was completed, the precipitate was filtered, washed and dried with deionized water to obtain the precursor of ...

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Abstract

The invention provides a ternary positive pole material with a surface layer coated with lithium tungstate and doped with W and a preparation method. A precursor is prepared by a current industrial hydroxide co-precipitation method, the method is simple and convenient, the production cost is low, and the technological condition is moderate. The preparation of the ternary positive pole material with the surface layer coated with lithium tungstate and doped with W is realized by a one-step method, that is, a tungstate source is added in the mixing process of the precursor and lithium salt, thenhigh-temperature calcination is performed and the ternary positive pole material is obtained, and the preparation method is simple. The ternary positive pole material with the surface layer coated with lithium tungstate and doped with W can solve the problems that the integral circulating property of a material is poor and the like due to the fact that the surface layer structure is unstable in the circulating process of a high-nickel ternary positive pole material; according to the ternary positive pole material with the surface layer coated with lithium tungstate and doped with W, the cooperative action of coating and doping is used for improving the electromechanical property and the structure stability of the ternary positive pole material, and the high-nickel ternary positive pole material with high properties is obtained.

Description

technical field [0001] The invention relates to a ternary positive electrode material coated with lithium tungstate and doped with W on the surface and a preparation method thereof, belonging to the field of chemical energy storage batteries. Background technique [0002] Lithium-ion batteries have the advantages of high capacity density, high power density, stable working voltage, and long cycle life, which determine their great development prospects in new energy vehicles. At present, they have become the main power source of electric vehicles and hybrid vehicles. However, as people's demand for the mileage of electric vehicles continues to increase, it is crucial to develop lithium-ion batteries with high energy density. Currently commercialized power lithium-ion batteries mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and nickel-cobalt-manganese ternary batteries. Among them, nickel-cobalt-manganese ternary batteries stand out due t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 王敬王冉陈实苏岳锋吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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