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A kind of binder for positive electrode of lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and binder technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., to achieve enhanced cycle performance, simple method, and easy promotion

Active Publication Date: 2019-06-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the binder has not been reported to inhibit the dissolution of polysulfides in lithium-sulfur batteries.

Method used

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  • A kind of binder for positive electrode of lithium-sulfur battery and preparation method thereof
  • A kind of binder for positive electrode of lithium-sulfur battery and preparation method thereof
  • A kind of binder for positive electrode of lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of mercaptolated CMC binder: Weigh 2 g of CMC, dissolve it in 200 ml of deionized water, and stir until a uniform and stable solution is formed. Then add EDAC to activate for 30min, then add 0.25g cysteamine to the mixed solution, adjust the solution to PH=4-5 with 1M HCl, then stir at room temperature for 3h, finally dialyze with 1mMHCl and freeze-dry, the obtained product is thiolated CMC, Synthesis process see figure 1 .

Embodiment 2

[0043] 1. Preparation of mercaptolated CMC binder: The preparation of the modified binder in this example is the same as in Example 1

[0044] 2. Preparation of positive electrode sheet: Sulfur-containing active material: acetylene black: modified CMC binder = 8:1:1 ratio, with deionized water as solvent, prepared into slurry, and coated on aluminum foil , the coating film was dried in a vacuum oven at 70° C. for 12 hours, and placed in a glove box for later use.

[0045]3. Assembling the button cell: put the diaphragm between the positive and negative electrodes, and then assemble and package the battery. The above operations are all completed in a glove box filled with argon. Lithium-sulfur battery performance see figure 2 .

Embodiment 3

[0047] 1. Preparation of thiolated PAA binder: Weigh 1g of PAA, dissolve it in 150ml of deionized water, and stir until a uniform and stable solution is formed. Then add EDAC to activate for 60min, then add 0.5g cysteine ​​to the mixture, adjust the solution to pH=4-5 with 1M HCl, then stir at room temperature for 4h, finally dialyze with 1mMHCl and freeze-dry, the obtained product is thiolated PAA.

[0048] 2. Preparation of positive electrode sheet: Sulfur-containing active material: acetylene black: mercaptolated PAA binder = 7:2:1 ratio, deionized water as solvent, adjusted to slurry, and coated on aluminum foil , the coating film was dried in a vacuum oven at 70° C. for 12 hours, and placed in a glove box for later use.

[0049] 3. Assembling the button cell: put the diaphragm between the positive and negative electrodes, and then assemble and package the battery. The above operations are all completed in a glove box filled with argon. Lithium-sulfur battery performance ...

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Abstract

The invention discloses a binder for a positive electrode of a lithium-sulfur battery and a preparation method of the binder. The binder is endowed with the function of immobilizing and adsorbing polysulfide generated in a sulfur positive electrode cycle process through sulfhydrylation of a common binder for the positive electrode of the lithium-sulfur battery or simple physical doping of a sulfhydryl compound, thereby suppressing capacity degradation caused by polysulfide diffusion and dissolution. In the preparation process of a positive plate of the lithium-sulfur battery, a modified binder is utilized, so that the capacity of the lithium-sulfur battery can be greatly improved and the cycle life of the lithium-sulfur battery can be greatly prolonged; the binder is simple in preparation technology, high in practicability and easy to popularize; and further industrial application of the lithium-sulfur battery is accelerated.

Description

technical field [0001] The invention relates to the field of battery binders, in particular to the binder for positive electrodes of lithium-sulfur batteries and its application in the preparation of lithium-sulfur batteries. Background technique [0002] Facing the depletion of traditional fossil energy and the increasingly serious environmental pollution problems, lithium-ion batteries are widely used in the field of electric vehicle power sources as a feasible energy-saving and emission-reduction solution. As a power battery for electric vehicles, it must have the characteristics of high energy density, high power density, and long cycle life. Coupled with the vigorous development of the consumer electronics field, higher requirements are also placed on lithium-ion batteries. In view of its ultra-high theoretical energy density (1675mAh / g), abundant raw materials, and environmental friendliness, lithium-sulfur batteries are the most promising energy batteries among lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/131H01M10/052
CPCH01M4/131H01M4/621H01M10/052Y02E60/10
Inventor 冯金奎张震
Owner SHANDONG UNIV
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