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Cathode material for high-capacity lithium-sulfur battery, preparation method and application thereof

A technology for lithium-sulfur batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult large-scale production, complex preparation process of porous carbon materials, high cost, etc., and achieves mild preparation process conditions and is conducive to The effect of mass production and simple raw materials

Inactive Publication Date: 2021-06-29
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most studies focus on highlighting the adsorption of micropores (2 research at the level; most porous carbon materials have complex preparation processes and high costs, making it difficult to achieve large-scale production, which poses a challenge to the practical application of lithium-sulfur

Method used

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  • Cathode material for high-capacity lithium-sulfur battery, preparation method and application thereof
  • Cathode material for high-capacity lithium-sulfur battery, preparation method and application thereof
  • Cathode material for high-capacity lithium-sulfur battery, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0050] A preparation method of a high-capacity lithium-sulfur battery positive electrode material (HPGC / S), comprising the following steps:

[0051] Step 1, preparing hierarchically porous graphitized carbon:

[0052] 1-1. Add 50g of ion exchange resin to 200ml of cobalt chloride aqueous solution with a concentration of 0.2mol / L, stir for 2 hours, evaporate in a water bath at 80°C for 10 hours under stirring conditions, dry at 80°C for 12 hours, and pulverize Finally, the resin for adsorbing cobalt ions is obtained, and the particle diameter of the resin is 1 to 50 microns;

[0053] 1-2, uniformly disperse 100 g of potassium hydroxide in 400 ml of absolute ethanol to obtain a potassium hydroxide ethanol solution, add the resin obtained in step 1 into the potassium hydroxide ethanol solution and soak for 10 hours, and filter to obtain the first product;

[0054] 1-3. Dissolve 100g of calcium hydroxide in 400ml of water to obtain an aqueous solution of calcium hydroxide, add th...

Embodiment 4～6

[0065] A preparation method of a high-capacity lithium-sulfur battery positive electrode material (HPGC / S), comprising the following steps:

[0066] Step 1, prepare hierarchically porous graphitized carbon according to Step 1 in Embodiments 1 to 3:

[0067] Step 2, mixing the multi-level porous graphitized carbon obtained in step 1, sublimated sulfur, conductive additives and bonding agent evenly, wherein the conductive additive is CNT, and the bonding agent is polyacrylonitrile (PAN), by mass percentage, more The mass ratios of hierarchically porous graphitized carbon, sublimed sulfur, binders and conductive additives are shown in Table 2.

[0068] Table 2

[0069]

[0070] The method for preparing the above-mentioned high-capacity lithium-sulfur battery positive electrode material into a positive electrode comprises the following steps: coating the high-capacity lithium-sulfur battery positive electrode material prepared above on a current collector, drying in a vacuum o...

Embodiment 7～8

[0073] A preparation method of a high-capacity lithium-sulfur battery positive electrode material (HPGC / S), comprising the following steps:

[0074] Step 1, prepare hierarchically porous graphitized carbon according to Step 1 in Embodiments 1 to 3:

[0075] Step 2, mixing the hierarchically porous graphitized carbon obtained in step 1, sublimated sulfur, conductive additives and adhesive, wherein the adhesive is polyacrylonitrile (PAN), and the hierarchically porous graphitized carbon is calculated by mass percentage , sublimated sulfur, binder and conductive additive in a mass ratio of 25:60:10:5. The conductive additives of Examples 7 and 8 are shown in Table 3.

[0076] table 3

[0077] Example conductive additive Example 7 CNT Example 8 superP

[0078] The method for preparing the above-mentioned high-capacity lithium-sulfur battery positive electrode material into a positive electrode comprises the following steps: coating the high-capacit...

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Abstract

The invention discloses a high-capacity lithium-sulfur battery positive electrode material and its preparation method and application. The preparation method of the high-capacity lithium-sulfur battery positive electrode material includes the following steps: preparing hierarchically porous graphitized carbon, and preparing the obtained hierarchically porous graphite Carbonized carbon, sublimed sulfur, conductive additives and binders are evenly mixed, the conductive additives are one or more of CNT, SuperP, KB and graphene, and the binders are polyacrylonitrile, PVDF, CMC and LA-132 one or more of . The present invention creatively utilizes the characteristics of the distribution of different pore diameters of the positive electrode material of the lithium-sulfur battery, designs a new type of multi-level porous graphitized carbon for the positive electrode of the high-capacity lithium-sulfur battery, and fully utilizes the distribution of different pore diameters to promote the core mechanism of the lithium-sulfur battery function, to realize the preparation of high-performance high-load lithium-sulfur batteries, while increasing the specific capacity, it provides a direction for the high-sulfur ratio of high-load lithium-sulfur positive electrodes.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a high-capacity lithium-sulfur battery positive electrode material and a preparation method and application thereof. Background technique [0002] With the vigorous development of the global new energy vehicle industry, electric vehicles with ultra-long cruising range have become the goal of many car companies. However, the battery energy density limited by the existing system has become a bottleneck in the development of the new energy industry. Lithium-sulfur batteries have attracted widespread attention due to their theoretical gram capacity of 1675mAh / g (the actual energy density is expected to reach 500-600Wh / kg). Of course, it also has great challenges: the non-conductivity of sulfur, the shuttling effect during charging and discharging, the rapid capacity attenuation caused by the huge change in volume, and the dendrites of the metal lithium anode limit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 艾果
Owner TIANJIN NORMAL UNIVERSITY
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