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Electrolyte and metal-sulfur battery

A technology of electrolyte and compound, which is applied in the field of electrolyte and metal-sulfur batteries, can solve problems such as dissolution, and achieve the effects of reduced dissolution, high ionic conductivity, and low dielectric constant

Active Publication Date: 2021-06-01
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Electrolyte and metal-sulfur battery
  • Electrolyte and metal-sulfur battery
  • Electrolyte and metal-sulfur battery

Examples

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Embodiment 1

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

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

[0077] Electrolyte: 4M lithium bisfluorosulfonimide (LiFSI) is 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, the difference being:

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

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Abstract

In order to overcome problems of positive electrode sulfur dissolution and polysulfide ''shuttle effect''of the existing lithium-sulfur battery, the invention provides an electrolyte, the electrolyte comprises lithium salt and a non-aqueous solvent, and the non-aqueous solvent comprises a urea compound as shown in a structural formula I and a halogenated ether compound as shown in a structural formula II; R1, R2, R3 and R4 are independently selected from H, halogen, alkyl with the carbon atom number of 1-10 or halogenated alkyl with the carbon atom number of 1-10; A is selected from O or S; and R1'and R2 'are independently selected from alkyl with the carbon atom number of 1-10 or halogenated alkyl with the carbon atom number of 1-10, and at least one of R1' and R2 'is selected from halogenated alkyl with the carbon atom number of 1-10. Meanwhile, the invention also discloses a metal-sulfur battery comprising the electrolyte. The electrolyte provided by the invention can effectively inhibit a ''shuttle effect'' of polysulfide generated by a positive electrode of the metal-sulfur battery so that sulfur dissolution is inhibited; and meanwhile, the electrochemical performance and the safety performance of the metal-sulfur battery are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrolyte solution and a metal-sulfur battery. Background technique [0002] With the advent of the 21st century, the energy problem is becoming more and more severe, and the environmental pollution continues to worsen. In order to achieve sustainable development, the utilization and development of new and renewable energy has become a research hotspot around the world. Water energy, wind energy, hydrogen energy, nuclear energy, tidal energy, and solar energy have been vigorously developed and utilized in countries all over the world. The improvement of the performance of energy storage devices 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 all over the world due to its high energy density, good energy conversion eff...

Claims

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Application Information

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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
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