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Small-size graphene positive electrode material for lithium-sulfur battery, lithium-sulfur battery prepared by small-size graphene positive electrode material and preparation method

A lithium-sulfur battery and cathode material technology, which is applied in the manufacture of battery electrodes, lithium batteries, and electrolyte batteries, can solve the problems of capacity attenuation and active material reduction, and achieve the effects of small flow barrier, less wrinkles, and low cost

Active Publication Date: 2018-01-19
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polysulfides will dissolve in the electrolyte, resulting in a reduction in active species, leading to capacity fading

Method used

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  • Small-size graphene positive electrode material for lithium-sulfur battery, lithium-sulfur battery prepared by small-size graphene positive electrode material and preparation method
  • Small-size graphene positive electrode material for lithium-sulfur battery, lithium-sulfur battery prepared by small-size graphene positive electrode material and preparation method
  • Small-size graphene positive electrode material for lithium-sulfur battery, lithium-sulfur battery prepared by small-size graphene positive electrode material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A preparation method for a lithium-sulfur battery, comprising the following steps:

[0072] 1) Using sulfuric acid with a mass fraction of 24.5% as the electrolyte, place microcrystalline graphite powder in a PP bag, use graphite plates as positive and negative electrode plates, and use positive and negative arrays to intercalate sulfate ions. Apply a DC voltage of +5V to -5V between the anode and the anode, electrolyze for 72h, and exchange the electrodes every 2h. The obtained graphene sulfuric acid solution is ball milled and washed to obtain small-sized graphene.

[0073] 2) Place the small-size graphene that has been washed to neutrality in a petri dish, place it in a refrigerator, and freeze for 12 hours, then put it into a freeze dryer for 24 hours.

[0074] 3) the freeze-dried small-size graphene powder is collected, and 2g of small-size graphene powder, 2g sublimated sulfur and 50g of agate balls with a diameter of 1-1.3cm are sealed in an agate ball mill jar ...

Embodiment 2

[0085] Lithium-sulfur battery cathode material, composed of small-scale graphene and sulfur compound. The area of ​​the small-sized graphene is 0.1-0.8μm 2 , less than 6 atomic layer thickness, few defects and high purity.

[0086] A preparation method for a lithium-sulfur battery, comprising the following steps:

[0087] 1) Using sulfuric acid with a mass fraction of 10% as the electrolyte, place the microcrystalline graphite powder in a PP bag, use the graphite plate as the positive and negative electrode plates, adopt the form of positive and negative arrays, intercalate sulfate ions, and Apply a DC voltage of +8V to -8V between the anode and the anode, electrolyze for 72h, and exchange the electrodes every 2h. The obtained graphene sulfuric acid solution is ball milled and washed to obtain small-sized graphene.

[0088] 2) Place the small-size graphene that has been washed to neutrality in a petri dish, place it in a refrigerator, and freeze for 12 hours, then put it in...

Embodiment 3

[0097] Lithium-sulfur battery cathode material, composed of small-sized graphene modified by sodium carboxymethyl cellulose and sulfur composite. The area of ​​the small-sized graphene is 0.1-0.8μm 2 , less than 6 atomic layer thickness, few defects and high purity.

[0098] A preparation method for a lithium-sulfur battery, comprising the following steps:

[0099] 1) Using sulfuric acid with a mass fraction of 24.5% as the electrolyte, place microcrystalline graphite powder in a PP bag, use graphite plates as positive and negative electrode plates, and use positive and negative arrays to intercalate sulfate ions. Apply a DC voltage of +5V to -5V between the anode and the anode, electrolyze for 72h, and exchange the electrodes every 2h. The obtained graphene sulfuric acid solution is ball milled and washed to obtain small-sized graphene.

[0100] 2) Place the small-size graphene that has been washed to neutrality in a petri dish, place it in a refrigerator, and freeze for 1...

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Abstract

The invention discloses a small-size graphene positive electrode material for a lithium-sulfur battery, the lithium-sulfur battery prepared by the small-size graphene positive electrode material and apreparation method and belongs to the field of battery materials. The preparation method comprises the steps of preparing small-size graphene through electrolyzing microcrystalline graphite powder; compounding the small-size graphene or surface-modified small-size graphene, such as the small-size graphene-modified by sodium carboxymethyl cellulose, sulfate, silicate, metal ions, a metal oxide, anon-metallic element or a high polymer material and sulfur at the mass ratio of 2:(1-9) to prepare the positive electrode material for the lithium-sulfur battery; and then preparing the lithium-sulfurbattery by adopting metal lithium as a negative electrode. The prepared lithium-sulfur battery is a real sense of graphene lithium-sulfur battery, the graphene is only used as an additive in the other lithium-sulfur batteries, and the prepared lithium-sulfur battery is fundamentally different from the other lithium-sulfur batteries. The positive electrode material for the lithium-sulfur battery is high in specific capacity, good in cycle performance, high in security, high in conductivity and low in cost, and has a very broad market prospect.

Description

technical field [0001] The invention relates to a small-size graphene lithium-sulfur battery and a preparation method thereof, in particular to a small-size graphene lithium-sulfur battery positive electrode material, a lithium-sulfur battery and a preparation method thereof, belonging to the field of electrode materials. Background technique [0002] With the rapid development of electric vehicles and mobile electronic devices, people's requirements for the energy density of lithium-ion batteries are getting higher and higher. In recent years, with the rapid development of the global economy, the growing demand for energy and the increasingly serious environmental pollution, the development of secondary batteries with high energy density, long cycle life, high safety, green environmental protection and low cost is of great importance in the field of new energy. significance. In the lithium-sulfur battery system, elemental sulfur is used as the positive electrode and metall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01M10/058
CPCY02E60/10Y02P70/50
Inventor 王俊中张燕王俊英
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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