Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting modified diaphragm

A lithium-sulfur battery and separator technology, applied in the field of lithium-sulfur batteries, can solve the problems of difficulty in further improving the utilization rate of sulfur, difficulty in solving the shuttle effect of polysulfides, high price, etc., so as to improve the capacity and cycle stability, and suppress the shuttle effect. , the effect of reducing battery costs
CN105489818AInactive Publication Date: 2016-04-13CHANGSHA RES INST OF MINING & METALLURGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHANGSHA RES INST OF MINING & METALLURGY
Publication Date
2016-04-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method for a modified diaphragm for a lithium-sulfur battery, the modified diaphragm and the lithium-sulfur battery adopting the modified diaphragm. The preparation method for the modified diaphragm for the lithium-sulfur battery comprises the following steps of mixing a conductive agent with a nano-metal oxide at a mass ratio of 1:1-10:1 to obtain a uniformly-mixed coating material; uniformly mixing the coating material with a binder at a mass ratio of 1:1-5:1, and scattering the mixture into solvent; performing mechanical stirring or ultrasonic scattering to obtain uniformly-dispersed coating slurry; coating the surface of a diaphragm substrate with the obtained coating slurry, and performing vacuum drying to obtain the modified diaphragm for the lithium-sulfur battery. The modified diaphragm for the lithium-sulfur battery prepared by the method can effectively restrain a shuttle effect of polysulfide in a charge / discharge process of the lithium-sulfur battery and prolong the cycle life of the lithium-sulfur battery; and the lithium-sulfur battery adopting the modified diaphragm is high in capacity and good in cycling performance.
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Description

technical field

[0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a preparation method of a modified diaphragm for a lithium-sulfur battery, a modified diaphragm and a lithium-sulfur battery with the modified diaphragm. Background technique

[0002] Lithium-sulfur battery is a new type of chemical battery with metal lithium as the negative electrode and elemental sulfur or organic sulfide as the positive electrode. It is one of the batteries with high theoretical energy density. It has the advantages of abundant resources, non-toxicity, environmental friendliness, and low price. . However, lithium-sulfur batteries still face many challenges in the application process, the most serious of which is that the polysulfides produced during battery charging and discharging dissolve in the electrolyte, and the "shuttle effect" occurs, resulting in the loss of active materials and reducing the capacity of lithium-sulfur batteries. ...

Claims

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