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Preparation method of high-performance CoSe/C-NS composite material, material and application

A composite material, C-NS technology, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problem of inability to meet the energy density requirements of lithium-ion batteries, irregular material morphology and structure, and affect the negative electrode tap density and other issues, to achieve strong cycle stability, uniform distribution, and increase the effect of material yield

Pending Publication Date: 2021-09-03
广东格林赛福能源科技有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the anode materials of commercial lithium-ion batteries are mainly artificial graphite and natural graphite materials. Since the theoretical specific capacity of graphite materials is only 372mAh g-1, it cannot meet the increasing energy density requirements of lithium-ion batteries.
After querying the Chinese patent application number 201911053422.4, the patent titled a CO-Mn-S composite material and its preparation method and application discloses that ZIF-67 is obtained by hydrothermal reaction with thiourea and soluble manganese salt after preparing ZIF-67 A CO-Mn-S composite material was developed, in which the amount of thiourea was about 3-50 times that of ZIF-67. The amount of raw materials was large and the economy was poor. It was necessary to find a more economical and efficient method with less amount of thiourea. Amides are classified as Class 2B carcinogens in the list of carcinogens released by the International Agency for Research on Cancer of the World Health Organization on October 27, 2017. Substances with less or no carcinogenicity need to be sought for use in In supercapacitor
The structural stability of the existing lithium battery negative electrode materials is not strong enough, and the capacity decays too quickly under high current density; the irregular shape of the material will affect the tap density when used as a negative electrode, and continuous improvement is needed to find alternatives with higher performance Material

Method used

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  • Preparation method of high-performance CoSe/C-NS composite material, material and application
  • Preparation method of high-performance CoSe/C-NS composite material, material and application
  • Preparation method of high-performance CoSe/C-NS composite material, material and application

Examples

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Embodiment 1

[0031] Example 1: The preparation method, material and application of a high-performance CoSe / C-NS composite material provided in this example, combined with the attached Figure 1-3 , including (1) the preparation process of S-doped ZIF-67 precursor (S-ZIF-67): fully dissolve 5mmol of Co(NO3)2·6H2O in 50ml of methanol to form A solution (magenta); Fully co-dissolve 20mmol of 2-methylimidazole and 15mmol of thiourea in 50ml of methanol to form solution B (colorless and transparent); under the strong stirring of a magnetic stirrer, use a rubber dropper to drop the solution A very slowly Add to solution B to form mixed solution C (dark purple); keep mixed solution C at room temperature under strong stirring of a magnetic stirrer for 24 hours, and then use methanol to dissolve the precipitate in mixed solution C repeatedly This process usually needs to be continued for more than 3 times, and then the purple precipitate after centrifugal washing is dried in a vacuum drying oven at...

Embodiment 2

[0036] Example 2: The preparation method, material and application of a high-performance CoSe / C-NS composite material provided in this example are basically the same as those in Example 1, except that:

[0037] S1: In the process of preparing ZIF-67, thiourea was added as a S source to make a S-ZIF-67 precursor doped with S; during the preparation of the S-ZIF-67 precursor, the Co(NO3 ) 2.6H2O, 2-methylimidazole, thiourea, and the ratio of the amount of methanol used are 5mmol: 20mmol: 15mmol: 50ml; the standing time is more than 24 hours; the drying is at 70°C for 24 hours Hour.

[0038] S2: After fully mixing the S-ZIF-67 precursor and selenium powder, annealing treatment was carried out under the protection of nitrogen to obtain CoSe / C-NS composite material. The mass ratio of S-ZIF-67 precursor to selenium powder is 1:0.8; the mixing time of S-ZIF-67 precursor and selenium powder is more than 10 minutes, and the annealing treatment conditions are: annealing treatment at a ...

Embodiment 3

[0039] Example 3: The preparation method, material and application of a high-performance CoSe / C-NS composite material provided in this example are basically the same as those in Example 1, except that:

[0040] S1: In the process of preparing ZIF-67, thiourea was added as a S source to make a S-ZIF-67 precursor doped with S; during the preparation of the S-ZIF-67 precursor, the Co(NO3 ) 2.6H2O, 2-methylimidazole, thiourea, and the ratio of the amount of methanol used are 5mmol: 20mmol: 15mmol: 150ml; the standing time is more than 24 hours; the drying is at 70°C for 24 hours Hour.

[0041] S2: After fully mixing the S-ZIF-67 precursor and selenium powder, annealing treatment was carried out under the protection of nitrogen to obtain CoSe / C-NS composite material. The mass ratio of S-ZIF-67 precursor to selenium powder is 1:0.8; the mixing time of S-ZIF-67 precursor and selenium powder is more than 10 minutes, and the annealing treatment conditions are: annealing treatment at a...

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Abstract

The invention discloses a preparation method of a high-performance CoSe / C-NS composite material. The preparation method comprises the following steps of: adding thiourea as an S source in the process of preparing ZIF-67 to prepare an S-doped S-ZIF-67 precursor; and fully mixing the S-ZIF-67 precursor with selenium powder, and carrying out annealing treatment under the protection of nitrogen to obtain the CoSe / C-NS composite material. The invention also discloses a high-performance CoSe / C-NS composite material and application of the high-performance CoSe / C-NS composite material in a lithium ion battery. The S-doped S-ZIF-67 precursor is synthesized in one step, a hydrothermal reaction is not needed, energy and time are saved; the S element is uniformly distributed on the surface of the outer layer of the composite material after selenylation annealing treatment; and the interplanar spacing of the outer layer carbon skeleton of the material is widened through more defects introduced by S, so that the overall structure of the composite material is more stable, and the conductivity of the material is enhanced, and therefore, the CoSe / C-NS composite material has higher energy density, better rate capability and higher cycling stability when being used as a negative electrode.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method, material and application of a high-performance CoSe / C-NS composite material. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries are mainly artificial graphite and natural graphite materials. Since the theoretical specific capacity of graphite materials is only 372mAh·g-1, it cannot meet the increasing energy density requirements of lithium-ion batteries. After querying the Chinese patent application number 201911053422.4, the patent titled a CO-Mn-S composite material and its preparation method and application discloses that ZIF-67 is obtained by hydrothermal reaction with thiourea and soluble manganese salt after preparing ZIF-67 A CO-Mn-S composite material was developed, in which the amount of thiourea was about 3-50 times that of ZIF-67. The amount of raw materials was large and the economy was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/581H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 崔立峰齐浩宇张新河魏庆华安贵全杨俊勇郭亮
Owner 广东格林赛福能源科技有限公司
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