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Polymer lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and polymer technology, applied in lithium batteries, secondary batteries, battery electrodes, etc., can solve the problems of complex preparation process, low conductivity, poor interface compatibility, etc., and achieve high energy density and safety performance. The effect of high and low polarization

Active Publication Date: 2015-07-22
深圳石墨烯创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymer electrolyte commonly used in traditional lithium batteries has low conductivity, complex preparation process, and poor interface compatibility when matching with sulfur electrodes, which have become technical difficulties in the development of polymer lithium-sulfur batteries.
[0004] Using in-situ polymerization to match the electrolyte and the electrode can effectively reduce the internal interface impedance of the battery, but low conductivity is still the main problem in the application of polymer electrolytes in lithium-sulfur batteries.

Method used

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  • Polymer lithium-sulfur battery and preparation method thereof
  • Polymer lithium-sulfur battery and preparation method thereof
  • Polymer lithium-sulfur battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step 1) take by weighing the following components according to the following mass relation, by weight, ethoxylated pentaerythritol tetraacrylate: ethylene carbonate: diethyl carbonate: ethyl methyl carbonate: lithium hexafluorophosphate: lauroyl peroxide=5:30:20 :30:14.9:0.1. Ethylene carbonate, diethyl carbonate and ethyl methyl carbonate are mixed uniformly, then lithium hexafluorophosphate is added, and ethoxylated pentaerythritol tetraacrylate and lauroyl peroxide are added to the above electrolyte to obtain a polymer electrolyte precursor;

[0032] Step 2) Prepare the battery cell to be injected: according to the weight ratio, the ratio of nano-sulfur powder: acetylene black: polyvinylidene fluoride is 70:25:5 to weigh the positive electrode material; according to the weight ratio, lithium intercalation graphite: acetylene black : The ratio of polyvinylidene fluoride is 90:5:5. Weigh the negative pole piece material. After stirring, coating, cold pressing, slitting...

Embodiment 2

[0035] Step 1) take by weighing the following components according to the following mass relationship, according to weight ratio, dipentaerythritol hexaacrylate: ethylene glycol dimethyl ether: 1,3-dioxolane: base two (trifluoromethanesulfonic acid) sulfite Lithium amide: azobisisobutyronitrile = 3:40:40:30:14.9:0.1. Mix ethylene glycol dimethyl ether and 1,3-dioxolane evenly, then add lithium bis(trifluoromethanesulfonic acid)imide, and then add bispentaerythritol hexaacrylate and azobisisobutyronitrile. The above-mentioned electrolyte solution prepares a polymer electrolyte precursor;

[0036] Step 2) Prepare the battery cell to be injected: according to the weight ratio, the ratio of sulfur-carbon composite material: carbon nanotube: polytetrafluoroethylene is 70: 25: 5 to weigh the positive electrode material, after stirring, coating, cold pressing , slitting, welding and other processes to obtain the pole piece to be wound, and then winding it together with the isolation...

Embodiment 3

[0039] Step 1) Weigh the following components according to the following mass relationship, and according to the weight ratio, succinonitrile: acrylonitrile substituted polyvinyl alcohol: lithium hexafluorophosphate: boron trifluoride=75:10:14.9:0.1. heating and melting succinonitrile at 50°C, adding acrylonitrile to replace polyvinyl alcohol, lithium hexafluorophosphate and boron trifluoride into the nitrile melt and mixing them evenly to obtain an all-solid polymer electrolyte precursor;

[0040] Step 2) Preparation of the battery cell to be injected: according to the ratio of organic sulfide: graphene: sodium carboxymethyl cellulose to 70:25:5, weigh the positive electrode material; according to the lithium-inserted silicon-carbon composite material: graphene: Sodium carboxymethyl cellulose is weighed in the ratio of 90:5:5, and the negative electrode pole piece material is mixed to obtain the pole piece to be wound through the processes of stirring, coating, cold pressing, sl...

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Abstract

The invention provides a polymer lithium-sulfur battery and a preparation method thereof. The polymer lithium-sulfur battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the positive electrode comprises a sulfur-based active substance, a conductive agent and a binder; the negative electrode comprises an active substance, the conductive agent and the binder; the electrolyte is a polymer electrolyte and comprises a combination of a solid solvent and a liquid solvent, lithium salt, a crosslinking monomer and an initiator. According to the invention, the prepared polymer lithium-sulfur battery is high in energy density and safety performance, stable in chemical performance, low in production cost, less in polarization in the charge and discharge processes, and stable in capacity, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of polymer lithium-sulfur battery manufacturing, and in particular relates to a novel polymer battery and its application. Background technique [0002] Modern human life is inseparable from mobile chemical power sources. Li-ion batteries are widely used in various small portable devices due to their environmental friendliness, high operating voltage, large specific capacity and long cycle life. The new green chemical power source. However, with the improvement of living tastes, people have put forward higher requirements for mobile appliances: lighter, thinner, smaller and more durable; therefore, as the power supply unit of these mobile power sources, the requirements for lithium-ion batteries are also corresponding Increase. However, traditional lithium-ion batteries have been unable to meet people's requirements for chemical power sources. The next-generation lithium-ion batteries with high energy dens...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/0565H01M10/0587
CPCH01M4/60H01M4/62H01M10/052H01M10/0565H01M10/0587H01M2300/0082Y02E60/10Y02P70/50
Inventor 康飞宇柳明周栋贺艳兵李宝华游从辉杜鸿达杨全红
Owner 深圳石墨烯创新中心有限公司
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