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Additive Co3O4-contained lithium-sulfur battery positive electrode material and preparation method

A lithium-sulfur battery and cathode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor battery cycle performance and low utilization rate of electrode active materials, so as to prolong battery life, improve electrochemical performance, The effect of inhibiting oxidative activity

Active Publication Date: 2016-06-15
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of containing additive Co 3 o 4 The lithium-sulfur battery cathode material solves the problems of low utilization of electrode active materials and poor battery cycle performance when elemental sulfur is used as the cathode material in the prior art

Method used

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  • Additive Co3O4-contained lithium-sulfur battery positive electrode material and preparation method
  • Additive Co3O4-contained lithium-sulfur battery positive electrode material and preparation method
  • Additive Co3O4-contained lithium-sulfur battery positive electrode material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Step 1) Combine KS-6 with Co(NO 3 ) 2 ·6H 2 O was put into a ball mill jar at a mass ratio of 1:1, an appropriate amount of ethanol was added, and after wet mixing for 1.5 hours, it was dried in an oven at 70°C for 12 hours.

[0027] Step 2) The mixture obtained in step 1) was calcined at a high temperature of 300°C under nitrogen in a tube furnace for 5 hours, and the product obtained after calcination contained KS-6 and Co 3 o 4 (by Co(NO 3 ) 2 ·6H 2 O produced by decomposition) has a mass ratio of 1:0.25.

[0028] Step 3) Mix and grind the calcined product of step 2) with sulfur at a ratio of 1:1, place it in a hydrothermal reaction kettle, and after passing argon gas for 20 minutes, place the reaction kettle at 156°C for 10 hours to obtain the additive containing co 3 o 4 cathode materials for lithium-sulfur batteries.

Embodiment 2

[0030] Step 1) Combine KS-6 with Co(NO 3 ) 2 ·6H 2O was put into a ball mill jar at a mass ratio of 1:0.5, and an appropriate amount of ethanol was added. After wet mixing for 2 hours, it was dried in an oven at 70°C for 15 hours.

[0031] Step 2) Calcining the mixture obtained in step 1) in a tube furnace at 400°C under nitrogen for 4 hours at a high temperature, the product obtained after calcination is KS-6 and Co 3 o 4 (by Co(NO 3 ) 2 ·6H 2 O produced by decomposition) has a mass ratio of 1:0.1.

[0032] Step 3) Mix and grind the calcined product of step 2) with sulfur at a ratio of 1:1.5, place it in a hydrothermal reaction kettle, and after passing in argon for 25 minutes, place the reaction kettle at 155°C for 12 hours to obtain the additive-containing co 3 o 4 cathode materials for lithium-sulfur batteries.

Embodiment 3

[0034] Step 1) Combine KS-6 with Co(NO 3 ) 2 ·6H 2 O was put into a ball mill jar at a mass ratio of 1:0.75, an appropriate amount of acetone was added, and after wet mixing for 1.5 hours, it was dried in an oven at 70°C for 12 hours.

[0035] Step 2) The mixture obtained in step 1) was calcined at a high temperature of 250°C under nitrogen in a tube furnace for 7 hours, and the product obtained after calcination contained KS-6 and Co 3 o 4 (by Co(NO 3 ) 2 ·6H 2 O produced by decomposition) has a mass ratio of 1:0.23.

[0036] Step 3) Mix and grind the calcined product of step 2) with sulfur at a ratio of 1:2, place it in a hydrothermal reaction kettle, pass argon gas for 30 minutes, and place the reaction kettle at 156°C for 12 hours to obtain co 3 o 4 cathode materials for lithium-sulfur batteries.

[0037] Based on the above examples, the samples prepared in Examples 1-3 were further used for battery assembly, and the obtained lithium-sulfur battery cathode compos...

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Abstract

The invention discloses an additive Co3O4-contained lithium-sulfur battery positive electrode material. The positive electrode material is prepared from KS-6, Co3O4 and sulfur in a doping manner, wherein Co3O4 and sulfur are uniformly filled in the KS-6 laminated layer; the mass ratio of KS-6 to Co3O4 is 1:0.1-0.25; and the mass ratio of Co3O4-KS-6 to sulfur is 1:1-2. The invention also discloses a preparation method for the additive Co3O4-contained lithium-sulfur battery positive electrode material; according to the preparation method, the raw materials are subjected to wet mixing and high-temperature calcining to obtain the Co3O4-KS-6 composite product; the obtained product is mixed with sulfur and grinded to obtain the lithium-sulfur battery positive electrode material; the preparation method is low in cost and simple to operate; meanwhile, the production efficiency can be improved easily, and industrial production can be facilitated; and in addition, the prepared positive electrode composite material is high in specific discharge capacity, high in cycling stability and can be widely applied to the energy storage field as the lithium-sulfur battery positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery preparation, and relates to a battery containing additive Co 3 o 4 Lithium-sulfur battery positive electrode material, the present invention also relates to this kind containing additive Co 3 o 4 Preparation method of lithium-sulfur battery cathode material. Background technique [0002] At present, fossil fuels play a dominant role in human energy needs, however, the resources of fossil fuels are limited, and the burning of fossil fuels causes serious environmental pollution. Therefore, the development of clean and renewable energy, such as wind energy and solar energy, is imminent, and these energy sources need to be transformed by electrochemical energy storage before they can be used by people, which requires reliable, low-cost, and environmentally friendly large-scale energy Storage System. The theoretical specific capacity of elemental sulfur is 1675mAh / g, and the theoret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/38H01M4/628H01M10/0525Y02E60/10
Inventor 杨蓉吕梦妮王黎晴付欣许云华
Owner XIAN UNIV OF TECH
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