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a comoo x Preparation method of /carbon/sulfur composite nanomaterial, lithium-ion battery negative electrode and lithium-ion half-battery

A technology of composite nanomaterials and composite materials, which is applied in the preparation of CoMoOx/carbon/sulfur composite nanomaterials, lithium-ion battery anodes and lithium-ion half-cells, and can solve the problems of serious particle aggregation, drastic volume change, and low rate performance. , to achieve high capacity performance, enhanced transmission, and high energy density

Inactive Publication Date: 2021-03-02
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, transition metal molybdate-based anode materials often suffer from low rate performance and short lifetime due to low electrical conductivity, severe particle aggregation, and dramatic volume change during repeated charge-discharge processes.

Method used

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  • a comoo <sub>x</sub> Preparation method of /carbon/sulfur composite nanomaterial, lithium-ion battery negative electrode and lithium-ion half-battery
  • a comoo <sub>x</sub> Preparation method of /carbon/sulfur composite nanomaterial, lithium-ion battery negative electrode and lithium-ion half-battery
  • a comoo <sub>x</sub> Preparation method of /carbon/sulfur composite nanomaterial, lithium-ion battery negative electrode and lithium-ion half-battery

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preparation example Construction

[0042] A preparation method of CoMoOx / carbon / sulfur composite nanomaterial, comprising the following steps:

[0043] a. Add 1 to 3 mmol cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 1 to 3 mmol sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O), cobalt nitrate hexahydrate and sodium molybdate dihydrate keep the same amount of matter, and it is optimal to use 1.5mmol cobalt nitrate hexahydrate and sodium molybdate dihydrate to ensure that the synthesized nanowires have the most uniform size ; Add 20-30ml of deionized water and 20-30ml of ethylene glycol to the reaction kettle, add a rotor and stir at 80-120r.p.m for 10-20min to form a uniform solution.

[0044] b. Transfer the solution to a polytetrafluoroethylene reactor with a capacity of 100ml for hydrothermal reaction. The reaction condition is to heat at 150-200°C for 6-10 hours; collect the reactants in the hydrothermal reaction through a centrifuge and wash them with deionized water Clean and dry, the drying con...

Embodiment 1

[0049] A CoMoO x The preparation method of / carbon / sulfur composite nanomaterial comprises the following steps:

[0050] a, in a clean 100ml beaker, add 1.5mmol cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 1.5mmol sodium molybdate dihydrate (Na 2 MoO 4 2H 2 0), add 30ml deionized water, 30ml ethylene glycol in reactor, add rotor and form homogeneous solution with 120r.p.m stirring 15min;

[0051] b. Transfer the solution to a polytetrafluoroethylene reactor with a capacity of 100ml for hydrothermal reaction, and the reaction condition is to heat at 180°C for 8 hours; collect the reactants in the hydrothermal reaction through a centrifuge, wash them with deionized water and dry them , the drying condition is 60 ° C for 4 hours; take 90 mg of the obtained reactant and 90 mg of dopamine hydrochloride, add it to 30 ml of deionized water and add a rotor to stir at a speed of 120 r.p.m for 12 hours, collect the obtained reactant through a centrifuge and use deionized wa...

Embodiment 2

[0056] A preparation method of CoMoOx / carbon / sulfur composite nanomaterial, comprising the following steps:

[0057] a, in a clean 100ml beaker, add 1mmol cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 1mmol sodium molybdate dihydrate (Na 2 MoO 4 2H 2 0), add 20ml deionized water, 20ml ethylene glycol in reactor, add rotor and form homogeneous solution with 80r.p.m stirring 10min;

[0058] b. Transfer the solution to a polytetrafluoroethylene reactor with a capacity of 100ml for hydrothermal reaction, and the reaction condition is to heat at 150°C for 6 hours; collect the reactants in the hydrothermal reaction through a centrifuge, wash them with deionized water and dry them , the drying condition is 60 ° C for 4 hours; take 80 mg of the obtained reactant and 80 mg of dopamine hydrochloride, add it to 25 ml of deionized water and add a rotor to stir at a speed of 80 r.p.m for 10 hours, collect the obtained reactant through a centrifuge and use deionized water Wash ...

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Abstract

The invention relates to a method for preparing a CoMoOx / carbon / sulfur composite nano material, a lithium-ion battery negative electrode and a lithium-ion half cell. According to the invention, a hydrothermal method, the metal oxide surface vulcanization modification technology and the assembly and electrochemical test of a lithium battery are combined, a cobalt molybdate nanowire is carbonized and vulcanized to be a negative electrode material of a lithium battery to assemble the half cell, safe and inexpensive cobalt molybdate is used as a raw material of the negative electrode material, thecost is low, and the safety is high. The composite nano material has an ultra-large specific surface area, the transport of electrons and electrolyte ions can be simultaneously enhanced, the selection of a metal oxide ensures that the nano material has a certain initial capacity, the carbonization enhances the conductivity of the material, and the improvement of a vulcanized surface further increases reactive active sites of the negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of nanometer-sized metal oxides, in particular to a CoMoO x Preparation method of / carbon / sulfur composite nanomaterial, lithium-ion battery negative electrode and lithium-ion half-battery. Background technique [0002] The negative electrode is an indispensable core component of lithium-ion batteries, and is currently mainly made of carbon materials and lithium titanate materials. The zero-strain volume of lithium titanate material can meet the high-rate charge-discharge and long cycle life (up to 104 times), but its own voltage platform is too high, and there is flatulence during the charge-discharge cycle, which causes cycle degradation. , there are many difficulties in practical application. Carbon anode materials such as graphitized carbon and amorphous carbon have been widely synthesized due to their natural abundance and chemical stability. However, the lithium intercalation potential of pure carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 朱永福张博金波姚雪朱星星郎兴友杨春成文子李建忱赵明蒋青
Owner JILIN UNIV
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