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Preparation method of secondary lithium-sulfur battery anode adhesive

A lithium-sulfur battery and adhesive technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of low solubility of β-cyclodextrin, and achieve the effects of stable cycle performance, enhanced contact, and high capacity retention.

Active Publication Date: 2011-05-25
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a preparation method of a secondary lithium-sulfur battery positive electrode binder, using carbonylated β-cyclodextrin as the secondary lithium-sulfur battery binder, and modifying the β-cyclodextrin , to obtain carbonylated β-cyclodextrin with strong water solubility, which overcomes the disadvantage of low solubility of β-cyclodextrin in water

Method used

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  • Preparation method of secondary lithium-sulfur battery anode adhesive
  • Preparation method of secondary lithium-sulfur battery anode adhesive
  • Preparation method of secondary lithium-sulfur battery anode adhesive

Examples

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Embodiment 1

[0022] Add 1 g of β-cyclodextrin to 5 g of 10 wt% H 2 o 2 In an aqueous solution, keep warm at 50°C for 48 hours to form a carbonylated β-cyclodextrin aqueous solution, and then dry to remove water and hydrogen peroxide to obtain a carbonylated β-cyclodextrin for secondary lithium-sulfur battery positive electrode binder. Cyclodextrin.

[0023] The infrared spectrum comparison results of carbonylated β-cyclodextrin and β-cyclodextrin used in the positive electrode binder of secondary lithium-sulfur batteries are as follows figure 1 As shown, the ratio of carbonylated β-cyclodextrin to β-cyclodextrin is 1733cm -1 There is one more C=O bond, that is, the carbonyl group, which can be seen through the H 2 o 2 After the aqueous solution is modified, a new chemical bond—carbonyl group is formed on the β-cyclodextrin molecule, thereby improving the solubility of the β-cyclodextrin in water.

[0024] Sulfur-based composite material, carbonylated β-cyclodextrin, and acetylene blac...

Embodiment 2

[0028] Add 5 g of β-cyclodextrin to 1 g of 20 wt% H 2 o 2 In an aqueous solution, keep warm at 70°C for 24 hours to form a carbonylated β-cyclodextrin aqueous solution, and then dry to remove water and hydrogen peroxide to obtain a carbonylated β-cyclodextrin for secondary lithium-sulfur battery positive electrode binder. Cyclodextrin.

[0029] Sulfur-based composite material, carbonylated β-cyclodextrin, and acetylene black are uniformly dispersed in water at a mass ratio of 85:5:10, then coated on aluminum foil, dried and pressed to obtain a positive electrode for a lithium-sulfur secondary battery ; Among them, the sulfur-based composite material is obtained by mixing 6g of elemental sulfur with 1g of polyacrylonitrile, heating to 280°C under nitrogen protection and keeping it warm for 6h.

[0030] The test results of the lithium-sulfur battery made of the positive electrode binder of the secondary lithium-sulfur battery are as follows: image 3 As shown, under the disch...

Embodiment 3

[0032] Add 5 g of β-cyclodextrin to 3 g of 30 wt% H 2 o 2 In an aqueous solution, keep warm at 90°C for 12 hours to form a carbonylated β-cyclodextrin aqueous solution, and then dry to remove water and hydrogen peroxide to obtain a carbonylated β-cyclodextrin for secondary lithium-sulfur battery positive electrode binder. Cyclodextrin.

[0033] The sulfur-based composite material, carbonylated β-cyclodextrin, and acetylene black are uniformly 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 The positive electrode of the secondary battery; the sulfur-based composite material is obtained by heating 8g of elemental sulfur and 1g of polyacrylonitrile under the protection of nitrogen to 280°C and keeping it warm for 6h.

[0034] The cycle results of the lithium-sulfur battery made of the positive electrode binder of the secondary lithium-sulfur battery at room temperature and 55...

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Abstract

The invention discloses a preparation method of a secondary lithium-sulfur battery anode adhesive. Carbonylated beta-cyclodextrin is taken as an adhesive instead of beta-cyclodextrin, so that water dissolubility is enhanced. A secondary lithium-sulfur battery anode is obtained by the following steps of: uniformly dispersing the carbonylated beta-cyclodextrin, a sulfur-containing material and a conductive agent in water; coating the solution on current collecting fluid; drying; and tableting. A secondary lithium-sulfur battery consists of the anode and a metal lithium cathode. Charging and discharging are performed at the temperature of 0.1 DEG C. Primary specific discharge capacity is up to 822.2 mAh / g, secondary specific discharge capacity is 652.7 mAh / g and the capacity is kept at 627.5 mAh / g after 45 cycles. Therefore, capacity keeping rate is high, and the cycle performance of the battery is stable at the temperature of 55 DEG C.

Description

technical field [0001] The invention relates to a method for preparing a binder for batteries, in particular to a method for preparing a positive electrode binder for a secondary lithium-sulfur battery. Background technique [0002] Binders are an important part of the positive and negative electrodes of chemical power sources, and have a great impact on the performance of the electrodes and even the entire battery, such as capacity, cycle life, internal resistance, and internal pressure during fast charging. Commonly used binders in lithium-ion battery electrode materials include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) and other binders that use alcohol as a dispersant, as well as sodium carboxymethylcellulose (CMC) and Water-soluble adhesives such as styrene-butadiene rubber (SBR) latex. [0003] Chinese patent CN101577323 discloses a method for preparing a secondary lithium-sulfur battery positive electrode binder, using β-cyclodextrin as the lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 王久林姚真东杨军努丽燕娜
Owner SHANGHAI JIAO TONG UNIV
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