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Cylindrical lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery, cylindrical technology, applied in the field of cylindrical lithium-sulfur battery and its preparation, can solve problems such as polysulfide compound dissolution

Inactive Publication Date: 2020-10-30
南京海泰纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: to provide a cylindrical lithium-sulfur battery and its preparation method to solve the problem of dissolving polysulfur compounds and prolong the life of the cylindrical lithium-sulfur battery

Method used

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  • Cylindrical lithium-sulfur battery and preparation method thereof
  • Cylindrical lithium-sulfur battery and preparation method thereof
  • Cylindrical lithium-sulfur battery and preparation method thereof

Examples

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preparation example Construction

[0039] A method for preparing a cylindrical lithium-sulfur battery, specifically:

[0040] S1. Preparation of positive electrode slurry: Mix deionized water and water-based glue according to the weight ratio of 100: (15-20) and stir for 25-35 minutes; add the weighed conductive agent to the stirred glue, and continue stirring for 25-20 minutes. 35min; add the sulfur-polyacrylonitrile positive electrode active material into the stirred mixture, and continue to stir for 150-240min; then add the solvent, its components are single-component or multi-component alcohol solvent and water-based slurry, the weight ratio is 100: (10-40) continue to stir for 25-35 minutes to prepare positive electrode slurry;

[0041] S2. Preparation of the positive electrode sheet: filter the positive electrode slurry prepared in step S1, evenly coat it on an aluminum foil with a thickness of 12-18um, carry out coating on both sides and dry it at 50-90°C; put the above-mentioned electrode sheet into In...

Embodiment 1

[0057] Step 1. Preparation of positive electrode slurry: Mix deionized water and water-based glue according to the weight ratio of 100:20 and stir for 30 minutes; add the weighed conductive agent to the stirred glue, and continue stirring for 30 minutes; Add the nitrile positive electrode active material into the stirred mixed solution and continue to stir for 180 minutes; then add a solvent whose components are single-component or multi-component alcohol solvent and water-based slurry, the weight ratio is 100:40 and continue to stir for 30 minutes to prepare the positive electrode slurry;

[0058] Step 2. Preparation of positive electrode sheet: filter the positive electrode slurry prepared in step S1, evenly spread it on an aluminum foil with a thickness of 18um, and carry out coating on both sides and dry it at 60°C; put the above-mentioned electrode sheet into a vacuum oven : The temperature is 90°C, the vacuum degree exceeds -0.096Mpa, and baked for 16 hours; the dried po...

Embodiment 2

[0066] Preparation of positive electrode sheet: Hollow mesoporous carbon spheres were prepared by the hard template method, and then compounded with sulfur at high temperature to obtain a "carbon-in-sulfur" type sulfur-hollow carbon sphere composite material, that is, a conventional polysulfide compound .

[0067] Other steps are the same as in Example 1 and will not be repeated here.

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Abstract

The invention discloses a cylindrical lithium-sulfur battery and a preparation method thereof, and belongs to the field of lithium batteries. The cylindrical lithium-sulfur battery comprises a shell,a positive plate, a negative plate, a coating diaphragm and an electrolyte. According to the invention, sulfur-polyacrylonitrile is used as a positive electrode material, metal lithium is used as a negative electrode material, the cylindrical lithium-sulfur battery is prepared by coating a combined conductive agent and a positive aqueous adhesive in the positive slurry, adopting the high-concentration lithium salt as the electrolyte, modifying the diaphragm and the like, the problem of dissolution of the polysulfide is successfully solved by introducing the non-dissolution type positive material, and the service life of the cylindrical lithium-sulfur battery is prolonged.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to a cylindrical lithium-sulfur battery and a preparation method thereof. Background technique [0002] Cylindrical lithium-sulfur battery is a commonly used type of lithium battery. It has the characteristics of high automation, good consistency, and high energy density. Lithium-sulfur cylindrical battery has ultra-high theoretical capacity and abundant reserves, and it is the most potential for development. One of the high-energy and low-cost systems. Lithium-sulfur batteries have 10 times the theoretical gram capacity of lithium-ion batteries. [0003] However, due to the dissolution of polysulfide compounds and the uncontrollable precipitation and crystallization on the surface of cylindrical lithium-sulfur batteries. Therefore, the performance of the actual specific energy is greatly affected, and the cycle life of the battery is affected. Contents of the invention [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/66H01M10/04H01M10/052H01M10/0563H01M10/0587H01M2/14
CPCH01M4/364H01M4/366H01M4/38H01M4/382H01M4/621H01M4/625H01M4/663H01M10/0422H01M10/052H01M10/0563H01M10/0587Y02E60/10Y02P70/50
Inventor 周海燕姜华
Owner 南京海泰纳米材料有限公司
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