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Application of adhesive to lithium-sulfur rechargeable battery anode

A lithium-sulfur secondary battery and binder technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problem of low electrochemical activity and reversibility of lithium-sulfur batteries, unstable glue solution system, loss of Freezing ability and other problems, to achieve the effect of improving electrochemical performance, stable cycle and good dispersibility

Active Publication Date: 2010-12-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gelatin aqueous solution system is unstable. Under the influence of acid, alkali, heat and enzymes, the long peptide chains of its molecules will be continuously hydrolyzed to generate low-molecular-weight polypeptides, resulting in deterioration of performance, especially the loss of freezing ability
Chinese patent CN1294666C discloses a butadiene-based copolymer as a binder for sulfur electrodes, the electrochemical activity and reversibility of the lithium-sulfur battery provided according to this method are not high, and the binder is toxic

Method used

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  • Application of adhesive to lithium-sulfur rechargeable battery anode
  • Application of adhesive to lithium-sulfur rechargeable battery anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The sulfur-based composite material, natural gum arabic, and acetylene black are evenly mixed and dispersed in water in a mass ratio of 80:10:10, and then coated on foamed nickel, dried and pressed to obtain a lithium-sulfur secondary battery positive electrode; The sulfur-based composite material is obtained by mixing elemental sulfur and polyacrylonitrile at a mass ratio of 10:1, heating to 300°C under nitrogen protection, and keeping the temperature for 10 hours.

[0020] Battery assembly and testing are as follows: metal lithium is used as the negative electrode to assemble a lithium-sulfur secondary battery, and the electrolyte is 1M LiPF 6 / EC: DMC (1:1 volume ratio, EC: ethylene carbonate, DMC: methyl carbonate); charge and discharge cut-off voltage is 1-3V (vs.Li / Li + ); the charge and discharge specific capacities were calculated based on the sulfur-based composite active materials. The specific capacity of the first discharge is 694mAh / g, and the specific cap...

Embodiment 2

[0022] The sulfur-based composite material, modified gum arabic, and conductive graphite are evenly mixed and dispersed in water at a mass ratio of 90:5:5, and then coated on carbon-coated aluminum foil, dried and pressed into tablets to obtain a lithium-sulfur secondary The positive electrode of the battery; wherein the modified gum arabic is obtained by heat-treating natural gum arabic at 120°C for 24 hours; wherein the sulfur-based composite material is mixed with elemental sulfur and polyacrylonitrile at a mass ratio of 8:1, heated to 320°C under nitrogen protection and Obtained by keeping warm for 5 hours.

[0023] Battery assembly and testing are the same as in Example 1. The specific capacity of the first discharge is 674mAh / g, and the specific capacity is about 530mAh / g after 1C charge-discharge cycle test, and the specific capacity is 524mAh / g after 20 cycles.

Embodiment 3

[0025] Sulfur-based composite material, natural gum arabic, and acetylene black are evenly mixed and dispersed in water at a mass ratio of 80:10:10, then coated on aluminum foil, dried, and pressed to obtain a positive electrode for a lithium-sulfur secondary battery; wherein the sulfur The base composite material is obtained by mixing elemental sulfur and polyacrylonitrile at a mass ratio of 6:1, heating to 280°C under nitrogen protection, and keeping the temperature for 6 hours.

[0026] Battery assembly and testing are the same as in Example 1. The specific capacity of the first discharge is 561mAh / g, and the specific capacity is about 444mAh / g after 1C charge-discharge cycle test, and the specific capacity is 444mAh / g after 40 cycles.

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Abstract

The invention discloses the application of an adhesive to a lithium-sulfur rechargeable battery anode, comprising the following steps of: evenly mixing the adhesive which is natural Arabic gum or modified Arabic gum, sulfur-bearing materials and a conductive agent; dispersing the mixture into water; coating the liquid on a current collector; and drying the current collector, and pressing the current collector to obtain the lithium-sulfur rechargeable battery anode. A lithium-sulfur rechargeable battery which comprises the lithium-sulfur rechargeable battery anode and a metal lithium cathode has the first specific discharge capacity of 694mAh / g. By a 1C charge-discharge circulation test, the specific capacity of the lithium-sulfur rechargeable battery is about 540mAh / g, and the circulation is very stable.

Description

technical field [0001] The invention relates to an application of a binder in a secondary battery, in particular to an application of a binder in a positive electrode of a lithium-sulfur secondary battery. Background technique [0002] The positive electrode of a secondary lithium battery is mainly composed of three parts, which are active material, binder and conductive agent. Lithium-sulfur secondary batteries refer to rechargeable batteries that use metallic lithium as the negative electrode and elemental sulfur, sulfur-based composite materials or organic sulfides (collectively referred to as sulfur-containing materials) as the positive electrode. Elemental sulfur can react with lithium to form lithium sulfide (Li 2 S), the theoretical capacity of this electrochemical reaction based on elemental sulfur is as high as 1672mAh / g, and elemental sulfur is cheap, safe and non-toxic, and is a new positive electrode active material with great development potential. Lithium-sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/62H01M4/70
CPCY02E60/122Y02E60/10
Inventor 王久林姚真东杨军努丽燕娜
Owner SHANGHAI JIAO TONG UNIV