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Lithium sulfur battery electrode material and method for manufacturing lithium sulfur battery by using same

A technology for lithium-sulfur batteries and negative electrode materials, which is applied in the manufacture of battery electrodes, lithium batteries, and electrolyte batteries. It can solve the problems of complex operation, poor stability and continuity of lithium batteries, etc. The effect of cycle performance and rate performance

Active Publication Date: 2017-06-20
宁夏和兴碳基材料有限公司
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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

[0033] A lithium-sulfur battery and a preparation method thereof are as follows:

[0034] 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.

[0035] 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 that the solid content is 30%. Then, the conductive agent co...

Embodiment 2

[0042] 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

[0044] 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.

[0045] 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%.

[0046] 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 lithium sulfur battery electrode material and a method for manufacturing a lithium sulfur battery by using the electrode material. A negative electrode material includes the following raw materials, by mass, 5-10 parts of stable lithium powder, 3-7 parts of carbon materials, I part of a binder, and a solvent. The stable lithium powder and the carbon materials which are mixture of carbon nano balls, carbon nano tubes, and mesoporous carbons according to the mass ratio of 5:2:1 are used to prepare negative mixed slurry, and then the kithium sulfur battery negative electrode material has excellent performance. The battery manufactured by the method is small in impedance, can effectively weaken the shuttle effect and dendritic growth in a continuous charging / discharging process, and has more excellent circulation performance and rate performance than metal lithium foils.

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): B82Y30/00H01M4/1393H01M4/583H01M4/62H01M10/0525H01M10/058
CPCB82Y30/00B82Y40/00H01M4/1393H01M4/362H01M4/382H01M4/583H01M4/587H01M4/621H01M4/622H01M4/625H01M4/628H01M10/052H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 不公告发明人
Owner 宁夏和兴碳基材料有限公司
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