Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of lithium-sulfur battery

A technology for lithium-sulfur batteries and sublimation sulfur, which is applied in the manufacture of lithium batteries, electrolyte batteries, battery electrodes, etc., can solve the problems of complex operation, poor stability and continuity of lithium batteries, and achieve high pore volume, good cycle performance and rate Performance, Effect of High Volumetric Energy Density

Inactive Publication Date: 2016-11-30
中能国盛动力电池技术(北京)有限公司
View PDF2 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A lithium-sulfur battery and a preparation method thereof are as follows:

[0033] 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.

[0034] 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

[0041] 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

[0043] 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.

[0044] 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%.

[0045] 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method of a lithium-sulfur battery, wherein the negative electrode material consists of the following raw material composition in parts by mass: 5-10 parts of steady-state lithium powder, 3-7 parts of carbon material, 1 part of binder and solvent. In the present invention, a mixture of stable lithium powder, carbon nanospheres, carbon nanotubes 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 5:2:1, so that the lithium The anode material of the sulfur battery has more excellent performance, and the battery prepared by the preparation method of the present invention shows a smaller impedance, which can effectively weaken the shuttle effect and dendrite growth in the continuous charge and discharge process, and has better performance than the conventional metal lithium foil. cycle 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M4/36H01M4/38H01M4/583H01M4/62H01M4/13H01M4/133H01M4/134H01M4/139H01M4/1393H01M4/1395
CPCH01M4/13H01M4/133H01M4/134H01M4/139H01M4/1393H01M4/1395H01M4/364H01M4/382H01M4/583H01M4/622H01M4/625H01M4/628H01M10/052H01M10/058H01M2004/021Y02E60/10Y02P70/50
Inventor 宗铭
Owner 中能国盛动力电池技术(北京)有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com