Nitrogen and sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and preparation method thereof

A nitrogen-sulfur co-doping, cathode material technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problem that lithium-ion batteries cannot have good rate performance and structural stability at the same time, and achieve good coating Protection effect, improve stability, improve transmission rate effect

Inactive Publication Date: 2019-05-17
GEM WUXI ENERGY MATERIAL CO LTD
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  • Abstract
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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a nitrogen-sulfur co-doped graphene-supported cobalt selenide-coated positive electrode material and a preparation me

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  • Nitrogen and sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and preparation method thereof
  • Nitrogen and sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and preparation method thereof

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Example Embodiment

[0022] In this embodiment, the preparation method of the nitrogen-sulfur co-doped graphene-supported cobalt selenide-coated cathode material includes:

[0023] Step S1, adding graphite oxide to an aqueous solution of a compound containing nitrogen and sulfur, and ultrasonically dispersing to obtain a uniformly mixed aqueous solution.

[0024] In this step, the ultrasonic dispersion time is 20-60 min, the concentration of graphite oxide in the uniformly mixed aqueous solution is 5g / L, the concentration of the nitrogen- and sulfur-containing compound is 0.025mol / L, and the nitrogen- and sulfur-containing The element compound is one or more of L-cysteine, thiourea, mercaptoethylamine, glutathione or methionine.

[0025] Step S2: The aqueous solution is reacted at a certain temperature to obtain nitrogen-sulfur co-doped graphene hydrogel, and then freeze-dried to obtain nitrogen-sulfur co-doped graphene.

[0026] In this step, the reaction temperature is 60-90°C, and the reaction time is ...

Example Embodiment

[0032] Example one:

[0033] 1) Add graphite oxide to the L-cysteine ​​aqueous solution containing 0.025mol / L, the graphite oxide concentration is 5g / L, and ultrasonically disperse for 30 minutes to obtain a uniformly mixed aqueous solution, and react at 80°C for 1 hour to obtain nitrogen and sulfur. Doped graphene hydrogel, freeze-dried to obtain nitrogen and sulfur co-doped graphene;

[0034] 2) Disperse the nitrogen and sulfur co-doped graphene in step 1 in Co(OAc) containing 50mmol / L 2 ·H 2 O and 50mmol / L Na 2 SeO 3 In the diethylene triamine solution, the doped graphene concentration is 5g / L. After ultrasonic for 30min, it is transferred to the autoclave and reacted at 140℃ for 18h. After cooling, it is suction filtered and washed with water three times to remove impurities, and freeze-dried Then obtain the nitrogen-sulfur co-doped graphene loaded cobalt selenide material;

[0035] 3) Mix the nitrogen-sulfur co-doped graphene-supported cobalt selenide material in step 2 with t...

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Abstract

The invention is applicable to the technical field of a lithium battery technology, and provides a nitrogen and sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and apreparation method thereof. During the preparation process, cobalt nelenide is loaded onto a graphene material, the mutual effect between the graphene material and Li can be improved due to presenceof a group containing elements N and S, a good coating protection effect is achieved, the mutual effect between the positive electrode material and an electrolyte is prevented, the volume effect generated by the material during the charge-discharge process can be effectively reduced by a hole structure of the graphene body, and the stability of the material structure is improved; and meanwhile, graphene has favorable conductivity, the cobalt selenide is a negative electrode material and is a lithium ion conductor, the lithium ion transmission rate can be improved by synergic effect of the graphene and the cobalt selenide, and finally, the lithium ion battery has excellent rate performance and cycle property and also has favorable safety.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a nitrogen-sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and a preparation method. Background technique [0002] Nickel-cobalt-manganese ternary lithium-ion battery cathode materials are widely used in IT products and new energy vehicles due to their high energy density and relatively simple preparation process. However, due to the poor structural stability of pure nickel-cobalt-manganese oxide (LNCM), it is easy to collapse the material structure due to the deintercalation of Li ions and the change of the valence state of Ni, Co, and Mn ions during the charging and discharging process. The cycle life and safety will cause great harm. Surface coating is an effective method to improve the electrical properties of ternary materials. Effective surface coating can reduce the side reaction between battery materials and electr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/583H01M10/0525
CPCY02E60/10
Inventor 许开华周晓燕徐世国张玉军廖宁靖
Owner GEM WUXI ENERGY MATERIAL CO LTD
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