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Positive pole piece for lithium-sulfur battery and preparation method of positive pole piece

A technology of positive electrode and lithium-sulfur battery, applied in the field of positive electrode and its preparation, can solve the problems of reduced Coulomb efficiency, increase of negative charge transfer resistance, loss of positive electrode capacity, etc. The effect of optimizing performance

Pending Publication Date: 2022-05-17
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium polysulfide shuttling will cause a variety of problems such as loss of positive electrode capacity, increase of negative electrode charge transfer resistance, and decreased Coulombic efficiency. Therefore, how to inhibit the shuttle of polysulfides is the focus of lithium-sulfur battery research and development.

Method used

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  • Positive pole piece for lithium-sulfur battery and preparation method of positive pole piece
  • Positive pole piece for lithium-sulfur battery and preparation method of positive pole piece

Examples

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Embodiment 1

[0026] This embodiment provides a high-porosity dry-process lithium-sulfur battery positive electrode, the preparation method of which is as follows: figure 2 As shown, in a dry room with a relative humidity 3 ) anhydrous lithium nitrate with a total volume of 25%, then shear and grind, and obtain a whole piece of uniform electrode blank after fibrillation of PTFE particles; roll the electrode blank at 38°C to make a dry electrode membrane The dry electrode diaphragm provided by the present embodiment is cut, and its thickness and area are tested. According to the true density of each component material, the porosity of the dry electrode diaphragm is calculated to be 45.2%, and the lithium nitrate is dissolved in the electrolyte. The porosity of the porous dry electrode membrane is 58.9%. Paste the dry-process electrode diaphragm on the carbon-coated aluminum foil current collector with conductive adhesive to make LiNO 3 The positive electrode of the dry-process lithium-sulf...

Embodiment 2

[0028] This embodiment provides a high-porosity dry-process lithium-sulfur battery positive electrode, the preparation method of which is the same as that of Embodiment 1, the difference is as follows: in a dry room with a relative humidity 3 The positive electrode of the dry-process lithium-sulfur battery accounts for 22%.

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Abstract

The invention relates to the technical field of lithium-sulfur batteries, in particular to a positive pole piece for a lithium-sulfur battery and a preparation method of the positive pole piece. The positive pole piece is formed by compounding a dry-method electrode diaphragm and a current collector, the dry-method electrode diaphragm is prepared by taking a positive active material, a binder, a conductive agent and a lithium salt as raw materials through a dry-method electrode process, the positive active material is a sulfur-containing active material, the lithium salt is lithium nitrate, and the current collector is a lithium ion battery. The ratio of the volume of the lithium nitrate to the total volume of the lithium nitrate, the positive electrode active material, the binder and the conductive agent is (1-50): 100. The lithium-sulfur electrode positive pole piece for the lithium-sulfur battery provided by the invention is rich in lithium nitrate and has high porosity, after the lithium-sulfur battery is assembled, lithium nitrate is continuously supplemented for an electrolyte, and meanwhile, holes are left in the positive pole piece, so that the porosity of the electrode is improved, and various properties of the lithium-sulfur battery are improved.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a positive pole piece for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries use sulfur as the positive electrode active material and metal lithium as the negative electrode, which has a theoretical energy density much higher than that of conventional lithium-ion batteries. At the same time, sulfur as a positive electrode active material is a by-product of the petroleum industry, and its price is much lower than that of lithium-ion battery positive electrode materials containing metal elements such as cobalt and nickel. Therefore, lithium-sulfur batteries have double advantages from cost to energy density, and are increasingly valued by research institutions at home and abroad. [0003] Different from the cycle mechanism of lithium ion intercalation / extraction in lithium-ion batteries, the charging and discharging reaction...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/052
CPCH01M4/13H01M4/139H01M4/62H01M10/052H01M2004/028Y02E60/10
Inventor 孙浩博赵春荣黄倩杨容弓胜民王建涛刘进萍张莹
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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