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Positive electrode host material as well as preparation method and application thereof

A technology of host material and positive electrode, applied in the field of positive host material and its preparation, can solve the problems of few catalytic active sites, poor ionic conductivity, small specific surface area, etc., and achieve the effect of excellent electrochemical performance

Pending Publication Date: 2022-04-29
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The host material disclosed in the above scheme has the problems of poor ion conductivity, small specific surface area or few catalytic active sites. Therefore, it is necessary to develop a material with high electronic conductivity, large specific surface area, strong polysulfide immobilization ability and high electrocatalytic activity. Positive host material is very necessary

Method used

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  • Positive electrode host material as well as preparation method and application thereof
  • Positive electrode host material as well as preparation method and application thereof
  • Positive electrode host material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a positive electrode host material, and the preparation method of the positive electrode host material is as follows:

[0051] (1) (1.09mmol) 284mg SnCl 2 and (0.36mmol) 73mg Co(NO 3 ) 2 ·H 2 O was dissolved in 40 mL deionized water, and solution A was obtained by ultrasonic-assisted method. Then (2mmol) 152mg CS(NH 2 ) 2Dissolve in 40mL deionized water, and obtain solution B by ultrasonic-assisted method. Then add solution A to solution B drop by drop, stir magnetically for 30 minutes while dropping, and then transfer to a clean 6cm 2 In the hydrothermal reactor of carbon cloth, react for 12h at 160°C. Take out the carbon cloth, wash it 4 times with deionized water, and freeze-dry overnight to obtain a yellow carbon cloth layer;

[0052] (2) Put 0.5g of sodium hypophosphite powder in a small magnetic boat, put it on one side of the tube furnace, arrange the above-mentioned carbon at the other end of the tube furnace, and put it at 350°C...

Embodiment 2

[0055] This embodiment provides a positive electrode host material, and the preparation method of the positive electrode host material is as follows:

[0056] (1) (1mmol) 260mg SnCl 2 and (0.3mmol) 54mg Mn(NO 3 ) 2 Dissolve in 40mL deionized water, and obtain Solution A by ultrasonic-assisted method. Then (2mmol) 152mg CS(NH 2 ) 2 Dissolve in 40mL deionized water, and obtain solution B by ultrasonic-assisted method. Then add solution A to solution B drop by drop, stir magnetically for 30 minutes while dropping, and then transfer to a clean 6cm 2 In the hydrothermal reactor of carbon felt, react for 12 hours at 165°C. Take out the carbon felt, wash it 4 times with deionized water, and freeze-dry overnight to obtain a yellow carbon cloth layer;

[0057] (2) Put 0.5g of sodium hypophosphite powder in a small magnetic boat, put it on one side of the tube furnace, put the above-mentioned carbon felt on the other end of the tube furnace, and put it under N at 350°C 2 Calcine...

Embodiment 3

[0059] The only difference between this embodiment and embodiment 1 is that Co(NO 3 ) 2 ·H 2 The quality of O is 40 mg (0.2 mmol), and other conditions and parameters are exactly the same as in Example 1.

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Abstract

The invention provides a positive electrode host material and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing a tin source, a transition metal source, thiourea and a solvent to obtain a mixed solution, transferring the mixed solution to a carbon material, and carrying out a hydrothermal reaction to obtain the carbon material loaded with transition metal doped SnS2 nanosheets; and (2) carrying out phosphating treatment on the carbon material loaded with the transition metal doped SnS2 nanosheet obtained in the step (1) to obtain the positive electrode host material. By doping phosphorus and transition metal, SnS2 can have an excellent catalytic conversion promoting effect on polysulfide, and by taking the material as a sulfur host material, an excellent electron conduction path can be ensured, the conversion of the polysulfide is accelerated, meanwhile, the loss of positive electrode sulfur is reduced, and finally, relatively good cycle stability can be shown.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a positive electrode host material and a preparation method and application thereof. Background technique [0002] With the depletion of global energy sources, finding new ways of energy utilization, transformation and storage has become an urgent task. In the field of energy storage, lithium-ion batteries occupy most of the market share, but there is an urgent need to increase energy density, and scarce lithium resources and cobalt resources limit their large-scale application. Lithium-sulfur batteries have extremely high theoretical capacity (1675mAh g -1 ), environmental friendliness and low cost are considered to be one of the most promising new generation energy storage devices. [0003] Elemental sulfur has the advantages of low cost and environmental friendliness, however, the cathode sulfur itself and its discharge product Li 2 The low conductivity of S, the la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/052
CPCH01M4/5815H01M10/052Y02E60/10
Inventor 苑丁丁唐红安
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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