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

A technology for lithium-sulfur batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex operation, poor stability and continuity of lithium batteries, and achieve high pore volume, inhibited growth, and improve skeleton conductivity. sexual effect

Active Publication Date: 2017-08-25
湖南高瑞电源材料有限公司
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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

[0027] A lithium-sulfur battery and a preparation method thereof are as follows:

[0028] 1. Preparation of the positive electrode sheet: a mixture of sublimed sulfur as the positive electrode active material, carbon nanofibers and expanded graphite in a mass ratio of 1:1 is used as the conductive agent, and polyvinylpyrrolidone and polyethyleneimine are in a volume ratio of 2: 1 The mixed system formed by mixing is a binder.

[0029] The mass ratio of the conductive agent to the binder formed by combining sublimated sulfur, carbon nanofibers and expanded graphite in the sulfur-containing positive electrode slurry at a mass ratio of 1:1 is 9:7:1. Dissolve the hybrid binder in a mixed solvent of propylene carbonate (PC), ethyl methyl carbonate (EMC) and polyethersulfone (PES) in a volume ratio of 3:2:1 to make a solution, wherein According to the mass calculation, the solvent is weighed according to the proportion of 30% solid content, and the solids are sublimated sulfur, nan...

Embodiment 2

[0036] Compared with Example 1, in Example 2, during the preparation of the negative electrode sheet, the mass ratio of the steady-state lithium powder, carbon material and binder was changed to 7:4:1, the heating temperature on the heating sheet was 40°C, and the heating time was for 11h. All the other operations and explanations are the same as those in Embodiment 1.

Embodiment 3

[0038] Compared with Example 1, in Example 2, during the preparation of the negative electrode sheet, the mass ratio of the steady-state lithium powder, carbon material and binder was changed to 5:5:1, the heating temperature on the heating sheet was 60°C, and the heating time was for 9h. All the other operations and explanations are the same as those in Embodiment 1.

[0039] 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 95.2%.

[0040] 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 carbon ...

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Abstract

The invention relates to a negative electrode material of a lithium-sulfur battery and a preparation method of the negative electrode material. The negative electrode material comprises the following compositions based on mass: 5-10 parts of steady-state lithium powder, 3-7 parts of carbon material, 1 part of binding agent and a solvent. According to the preparation method, a mixture mixed by the steady-state lithium powder, carbon nanosphere / carbon nanotube and mesoporous carbon according to mass ratios of 5:2:1 is particularly selected as the carbon material in a negative electrode to prepare a negative electrode mixed paste, so that the negative electrode material of the lithium-sulfur battery has more excellent performance; the prepared battery according to the method is endowed with relatively small impedance, a shuttle effect and dendrite growth during the continuous charging / discharging process can be effectively reduced, and the battery shows batter cycle performance and rate performance than those of a conventional metal lithium foil.

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): H01M4/133H01M4/36H01M4/587H01M4/62
CPCH01M4/133H01M4/364H01M4/587H01M4/622H01M4/625Y02E60/10
Inventor 席柳江
Owner 湖南高瑞电源材料有限公司
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