Compound diaphragm for lithium-sulfur battery

A composite diaphragm and lithium-sulfur battery technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of reducing the utilization rate of sulfur active materials, slow migration speed, and deteriorating the performance of lithium-sulfur batteries, so as to reduce the shuttle effect, life-enhancing effect
CN106848165AInactive Publication Date: 2017-06-13SHENZHEN PEICHENG TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Ā· China
Current Assignee / Owner
SHENZHEN PEICHENG TECH CO LTD
Publication Date
2017-06-13
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

The invention provides a compound diaphragm for a lithium-sulfur battery. The diaphragm is prepared by the following steps of: (1) adding MoS2 powder into a hexane solution of n-butyllithium, performing a stirring reaction, performing filtration, and washing the solution with cyclohexane and water to obtain laminar MoS2; and (2) adding graphite oxide and the laminar MoS2 into water for ultrasonic dispersion to form a suspended liquid, then adding the suspended liquid into a suction flask padded with a Celgard diaphragm and filter paper, and drying the suction flask, and tearing off the filter paper to obtain the compound diaphragm for the lithium-sulfur battery. The laminar MoS2 in a laminar MoS2 / graphene oxide layer can form severe chemical absorption on polysulfide formed in the charging and discharging processes, and can effectively prevent the polysulfide from penetrating through the diaphragm to reach a cathode to reduce a shuttle flying effect, so that the service life of the lithium-sulfur battery is prolonged.
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Description

technical field

[0001] The invention relates to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery diaphragm. Background technique

[0002] A lithium-sulfur battery is a battery system in which metallic lithium is used as the negative electrode and elemental sulfur is used as the positive electrode. Lithium-sulfur batteries have two discharge platforms (about 2.4 V and 2.1 V), but their electrochemical reaction mechanism is relatively complicated. Lithium-sulfur batteries have the advantages of high specific energy (2600 Wh / kg), high specific capacity (1675 mAh / g), and low cost, and are considered to be a promising new generation of batteries. However, at present, there are problems such as low utilization of active materials, low cycle life and poor safety, which seriously restrict the development of lithium-sulfur batteries. The main reasons for the above problems are as follows: (1) elemental sulfur is an electronic and ion insulator, and i...

Claims

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