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Cobalt/nitrogen double-doped carbon nanobelt, Li-SeS2 battery positive electrode material, preparation method of Li-SeS2 battery positive electrode material and secondary battery

A technology of carbon nanobelts and battery positive electrodes, applied in battery electrodes, positive electrodes, nano-carbons, etc., can solve the problems that restrict the promotion and application of ZIF-8 derived carbon substrates, limit the load of active materials, and cumbersome preparation processes, etc., and achieve excellent results. The effect of electrochemical performance, increased load capacity, and simple operation of the process

Active Publication Date: 2022-01-28
河北中煤旭阳能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a typical representative of ZIF materials, the pore structure of ZIF-8-derived carbon materials is relatively simple, which limits the loading of active materials by this type of carbon materials, and after high-temperature carbonization, ZIF-8-derived carbon materials can only achieve in-situ N doping, which both constrains the ZIF-8 derived carbon matrix in Li-SeS 2 Promotion and Application of Battery Positive Electrode
[0005] In addition, the existing graphene-like functional carbon materials have problems such as cumbersome preparation process, long time and high cost.

Method used

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  • Cobalt/nitrogen double-doped carbon nanobelt, Li-SeS2 battery positive electrode material, preparation method of Li-SeS2 battery positive electrode material and secondary battery
  • Cobalt/nitrogen double-doped carbon nanobelt, Li-SeS2 battery positive electrode material, preparation method of Li-SeS2 battery positive electrode material and secondary battery
  • Cobalt/nitrogen double-doped carbon nanobelt, Li-SeS2 battery positive electrode material, preparation method of Li-SeS2 battery positive electrode material and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] A Li-SeS 2 A method for preparing a positive electrode material for a battery, comprising the following steps:

[0080] 1. Precursor preparation: 0.625g of zinc nitrate hexahydrate and 0.0316g of cobalt nitrate hexahydrate were dissolved in 25ml of methanol solvent to form solution A, while 0.767g of 2-methylimidazole was dissolved in another 25ml of methanol solvent to form solution B. After the two solutions are sealed, stir fully, weigh 20g NaCl and add it to solution A, add solution B while stirring rapidly, after the solution B is completely added, seal the above mixed solution and stir rapidly at room temperature for 8h, then The mixed solution was transferred to a constant temperature heating stirrer at 41° C., and the sealing film was removed and the solution was continuously stirred until the methanol was completely evaporated.

[0081] 2. Carbonization and active material loading: Put the precursor material into a tube furnace and heat it at 910°C. The heatin...

Embodiment 2

[0086] A Li-SeS 2 A method for preparing a positive electrode material for a battery, comprising the following steps:

[0087] 1. Precursor preparation: 4.99g of zinc nitrate hexahydrate and 0.24g of cobalt nitrate hexahydrate were dissolved in 200ml of methanol solvent to form solution A, while 6.13g of 2-methylimidazole was dissolved in another 200ml of methanol solvent to form solution B. After the two solutions are sealed, fully stir, weigh 160g NaCl and add it to the mixed solution A, add solution B while stirring rapidly, after the B solution is completely added, seal the above mixed solution and stir rapidly at room temperature for 8h, Then the mixed solution was transferred to a constant temperature heating stirrer at 41° C., and the sealing film was removed and the solution was continuously stirred until the methanol was completely evaporated.

[0088] 2. Put the precursor material into a tube furnace and heat it at 1000°C. The heating rate is 5°C / min, and the consta...

Embodiment 3

[0095] A Li-SeS 2 A method for preparing a positive electrode material for a battery, comprising the following steps:

[0096] 1. Precursor preparation: 4.76g of zinc nitrate hexahydrate and 0.47g of cobalt nitrate hexahydrate were dissolved in 200ml of methanol solvent to form solution A, while 6.13g of 2-methylimidazole was dissolved in another 200ml of methanol solvent to form solution B. After the two solutions are sealed, fully stir, weigh 160g NaCl and add it to the mixed solution A, add solution B while stirring rapidly, after the B solution is completely added, seal the above mixed solution and stir rapidly at room temperature for 8h, Then the mixed solution was transferred to a constant temperature heating stirrer at 41° C., and the sealing film was removed and the solution was continuously stirred until the methanol was completely evaporated.

[0097] 2. Put the precursor material into a tube furnace and heat it at 950°C. The heating rate is 5°C / min, and the constan...

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Abstract

The invention provides a cobalt / nitrogen double-doped carbon nanobelt, a Li-SeS2 battery positive electrode material, a preparation method of the Li-SeS2 battery positive electrode material and a secondary battery, and relates to the technical field of battery materials. The preparation method comprises the steps of adding an inorganic salt template agent in the hydrothermal synthesis process, promoting cobalt-doped ZIF-8 crystals to grow on the surface of the template agent in situ, obtaining a required precursor raw material after drying, carrying out high-temperature carbonization and template removal processes on the precursor to prepare a cobalt / nitrogen in-situ double-doped carbon nanobelt material with a hierarchical porous structure; and infiltrating selenium disulfide and the cobalt / nitrogen double-doped carbon nanobelt base material to obtain the Li-SeS2 battery positive electrode material. Compared with a ZIF-8 derived carbon material, a pore structure is mainly concentrated in a micropore range, and the carbon nanobelt material has a graded porous structure, so that the loading capacity of a SeS2 active substance is effectively improved, and further electrochemical tests show that the positive electrode material has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing cobalt / nitrogen double-doped carbon nanobelts and Li-SeS containing the cobalt / nitrogen double-doped carbon nanobelts 2 Battery positive electrode material and its preparation method, secondary battery. Background technique [0002] Sulfur / selenium (S / Se)-based cathode materials have received great attention in the field of new secondary batteries due to their high theoretical capacity and high-rate charge-discharge performance. Li-SeS 2 The battery has a specific capacity of 1123mAh / g. It is a new type of secondary battery that has emerged in the past two years. It overcomes the problems of Li-S batteries using S as the positive electrode material, that is, the conductivity of S itself is poor and the active material S The utilization rate is low, and at the same time, it overcomes the problem that the Li-Se battery uses Se as the positive elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C01B19/04H01M4/58H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCC01B32/15C01B19/04H01M4/62H01M4/628H01M4/625H01M4/5815H01M10/052B82Y30/00B82Y40/00H01M2004/028C01P2004/80C01P2006/40Y02E60/10
Inventor 金文武于守立张青青庞伟伟赵小欣张晓柱闫晓宇董锋军梁瑞凯白俊娟
Owner 河北中煤旭阳能源有限公司
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