A kind of lithium-sulfur battery negative electrode material and preparation method thereof

A lithium-sulfur battery and negative electrode material technology, applied in 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, etc., achieve high pore volume, reduce shuttle effect, the effect of improving the conductivity of the skeleton

Active Publication Date: 2017-10-13
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. Dissolve 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 material and th...

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 lithium-sulfur battery negative electrode material and a preparation method thereof, which is characterized in that it comprises: in parts by mass, composed of the following raw material composition: 7-10 parts of steady-state lithium powder, 3-8 parts of carbon material and solvent . In the present invention, a mixture of stable lithium powder and vertically arrayed carbon nanotubes (VACNT) and mesoporous carbon is specially selected as the carbon material in the negative electrode to prepare the negative electrode mixed slurry according to the mass ratio of 10:1. The use of the binder in the slurry makes the lithium-sulfur battery negative electrode material have more excellent performance. At the same time, with the optimally selected positive electrode material, the battery prepared by the preparation method of the present invention shows a small impedance, which can effectively weaken the shuttle effect and dendrite growth in the continuous charge and discharge process, and shows a better cycle than conventional metal lithium foil. performance and rate performance.

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 Patents(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 李祎曾炳军
Owner 东莞市技领科技有限公司
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