An electrolyte and metal-sulfur battery

A technology for electrolyte and sulfur batteries, applied in electrolytes, secondary batteries, circuits, etc., can solve problems such as dissolution, achieve the effects of reducing dissolution, improving utilization, and improving cycle stability

Active Publication Date: 2022-07-19
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of positive electrode sulfur dissolution and polysulfide "shuttle effect" in existing lithium-sulfur batteries, the present invention provides an electrolyte and a metal-sulfur battery

Method used

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  • An electrolyte and metal-sulfur battery
  • An electrolyte and metal-sulfur battery
  • An electrolyte and metal-sulfur battery

Examples

Experimental program
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Embodiment 1

[0075] This embodiment is used to illustrate the metal-sulfur battery disclosed in the present invention and the preparation method thereof, including the following operation steps:

[0076] Battery preparation: Mix sulfur and Ketjen black in a ratio of 1:3, and heat at 155 °C for 12 h to obtain a C / S composite with a sulfur content of 66%, which is mixed with 10 wt% PVDF in NMP solution , the mixed slurry was coated on aluminum foil, dried in vacuum at 60 ° C for 12 hours, cut into a 12mm diameter circle as the positive electrode of the button battery, the separator was a celgard2325 type separator, and the negative electrode was a diameter of 16mm and a thickness of 0.4mm. The amount of electrolyte is 20ul / mg.

[0077] Electrolyte: 4M lithium bisfluorosulfonimide (LiFSI) was dissolved in the electrolyte solvent of DME: compound 1: compound 9=3:1:1.

Embodiment 2～15

[0079] Examples 2 to 15 are used to illustrate the metal-sulfur battery disclosed in the present invention and its preparation method, including most of the operation steps in Example 1, and the differences are:

[0080] The negative electrode materials, electrolytes and electrolyte solvents shown in Examples 2 to 15 in Table 1 were used.

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Abstract

In order to overcome the problems of positive electrode sulfur dissolution and polysulfide "shuttle effect" in existing lithium-sulfur batteries, the present invention provides an electrolyte, comprising a lithium salt and a non-aqueous solvent, and the non-aqueous solvent includes the structure shown in structural formula I. urea compounds and halogenated ether compounds represented by structural formula II; wherein, R 1 , R 2 , R 3 and R 4 Each is independently selected from H, halogen, hydrocarbon group with 1 to 10 carbon atoms or halogenated hydrocarbon group with 1 to 10 carbon atoms; A is selected from O or S; R 1 ' and R 2 ' are each independently selected from a hydrocarbon group having 1 to 10 carbon atoms or a halogenated hydrocarbon group having 1 to 10 carbon atoms, and R 1 ' and R 2 ' has at least one selected from halogenated hydrocarbon groups having 1 to 10 carbon atoms. Meanwhile, the present invention also discloses a metal-sulfur battery comprising the above electrolyte. The electrolyte provided by the invention can effectively inhibit the "shuttle effect" of polysulfides produced by the positive electrode of the metal-sulfur battery, thereby inhibiting the dissolution of sulfur; meanwhile, the electrochemical performance and safety performance of the metal-sulfur battery are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to an electrolyte and a metal-sulfur battery. Background technique [0002] With the advent of the 21st century, the energy problem is becoming more and more serious, and the environmental pollution continues to deteriorate. In order to achieve sustainable development, the utilization and development of new and renewable energy has become a research hotspot around the world. Hydropower, wind power, hydrogen power, nuclear power, tidal power and solar power have been vigorously developed and utilized in all countries of the world. The improvement of energy storage device performance can effectively promote the popularization of new energy applications. Among the many energy storage devices, electrochemical energy storage has become one of the important research directions in the world due to its high energy density, good energy conversion efficiency, low pollution, convenient comb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0569H01M10/0525H01M2300/0037Y02E60/10
Inventor 邓永红肖映林钱韫娴余恒益胡时光
Owner SHENZHEN CAPCHEM TECH CO LTD
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