Cathode material of lithium sulfur battery and preparation method of cathode material

A lithium-sulfur battery and negative electrode material technology, applied in the direction of battery electrodes, electrolyte battery manufacturing, non-aqueous electrolyte battery electrodes, etc., can solve the problems of complex operation, poor stability and continuity of lithium batteries, and achieve high pore volume and weakened shuttling effect, the effect of large discharge area

Active Publication Date: 2016-04-20
东莞市技领科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the object of the present invention is to provide a negative electrode slurry prepared from stable lithium powder and a special proportion carbon material, and a lithium-sulfur battery prepared from the slurry, It solves the technical defects caused by the use of hard carbon and other materials in the prior art, and solves the technical problems of poor stability and continuity and complicated operation in the improvement of lithium battery negative electrodes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of positive electrode sheet: Polynaphthalene / sulfur composite material is used as the positive electrode active material, Ketjen black ECP600JD and carbon nanofiber are combined according to the mass ratio of 1:3 as the conductive agent, polyvinylpyrrolidone and polyethyleneimine are used according to the volume The mixed system with a ratio of 2:1 is the binder.

[0030] The mass ratio of polynaphthalene / sulfur composite material, conductive agent and binder in the sulfur-containing positive electrode slurry is 8:5:1. It is made by dissolving the mixed binder in a solvent mixed with ethylene carbonate (EC), methyl vinyl ester (MA) and trifluoropropylene carbonate (TFPC) at a volume ratio of 7:7:1 solution. Wherein, according to the mass calculation, the solvent is weighed according to the ratio of a solid content of 30%, and the solid includes a polynaphthalene / sulfur composite material and a conductive agent. Then mix the polynaphthalene / sulfur composite...

Embodiment 2

[0037] Compared with Example 1, in Example 2, during the preparation process of the negative electrode sheet, the mass ratio of the steady-state lithium powder and carbon material was changed to 7:3, the heating temperature on the heating sheet was 40° C., and the heating time was 11 hours. All the other operations and explanations are the same as those in Embodiment 1.

Embodiment 3

[0039] Compared with Example 1, in Example 2, during the preparation process of the negative electrode sheet, the mass ratio of the steady-state lithium powder and the carbon material was changed to 6:5, the heating temperature on the heating plate was 60° C., and the heating time was 9 hours. All the other operations and explanations are the same as those in Embodiment 1.

[0040] Compared with ordinary lithium foil electrodes, when the negative electrodes of Examples 1, 2, and 3 use steady-state lithium powder and mixed carbon materials, the lithium-sulfur battery of the present invention can exhibit better first-time charge-discharge specific capacity, and 100 times at the same time The capacity retention after cycling is above 95.8%.

[0041] After the button batteries of each embodiment were left standing for 24 hours, an AC impedance comparison experiment was performed. Experimental results show that when Examples 1, 2 and 3 use steady-state lithium powder and mixed car...

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Abstract

The invention relates to a cathode material of a lithium sulfur battery and a preparation method of the cathode material. The cathode material is characterized by comprising the following raw material composition in parts by mass: 7 to 10 parts of steady-state lithium powder, 3 to 8 parts of a carbon material and a solvent. A mixture formed by mixing the steady-state lithium powder, a vertical array carbon nano tube (VACNT) and mesoporous carbon according to the mass ratio of 10:1 is specially adopted to serve as a carbon material in a cathode to prepare a cathode mixing slurry; therefore, use of an adhesive in the cathode slurry is avoided, and the cathode material of the lithium sulfur battery is better in performance. Meanwhile, the battery which is matched with an optimally selected anode material and is prepared by the preparation method disclosed by the invention is lower in impedance; the shuttle effect and dendritic crystal growth in the continuous charging and discharging processes can be effectively weakened; compared with a conventional metal lithium foil, the cathode material is higher in circulation performance and rate capability.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and in particular relates to an electrode material for a lithium-sulfur battery and a method for preparing a lithium-sulfur battery by using the electrode material. Background technique [0002] Lithium-ion battery (Lithium-ion battery, LIB), also known as lithium secondary battery, is a rechargeable mobile power device. LIB has many advantages such as high energy density, high power density, long cycle life, clean and non-toxic, and no memory effect. Since LIB was commercialized by Sony in the 1990s, LIB has been developed rapidly and extensively. Currently LIB has become the power source of most mobile electronic devices. In recent years, people have conducted in-depth and extensive research on LIB. In LIB, the anode material has a great influence on the performance of the battery, and the development of excellent anode materials is also one of the key factors to improve the perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/60H01M4/62H01M4/13H01M4/133H01M4/134H01M4/137H01M4/139H01M4/1393H01M4/1395H01M4/1399H01M10/058
CPCH01M4/13H01M4/133H01M4/134H01M4/137H01M4/139H01M4/1393H01M4/1395H01M4/1399H01M4/362H01M4/38H01M4/382H01M4/583H01M4/602H01M4/621H01M4/622H01M4/625H01M10/058H01M2004/021H01M2220/30Y02E60/10Y02P70/50
Inventor 宗铭
Owner 东莞市技领科技有限公司
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