Triphenylthiol additive-containing lithium-sulfur battery electrolyte and lithium-sulfur battery

A lithium-sulfur battery and benzene trithiol technology are applied in the field of lithium-sulfur battery electrolyte and lithium-sulfur battery, and can solve the problem that lithium negative electrode and sulfur positive electrode cannot be solved at the same time.

Inactive Publication Date: 2021-09-14
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these works are based on the modification of individual electrodes or electrolytes, and

Method used

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  • Triphenylthiol additive-containing lithium-sulfur battery electrolyte and lithium-sulfur battery
  • Triphenylthiol additive-containing lithium-sulfur battery electrolyte and lithium-sulfur battery
  • Triphenylthiol additive-containing lithium-sulfur battery electrolyte and lithium-sulfur battery

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Embodiment 1

[0039]A lithium-sulfur battery electrolyte (BTT electrolyte) containing a benzenetrithiol additive is provided, including ether solvents, lithium salts and additives; wherein the ether solvents are a mixed solution of DOL and DME at a volume ratio of 1:1 , the lithium salts LiTFSI and LiNO 3 , the concentration of LiTFSI in the electrolyte is 1mol / L, LiNO 3 The concentration in the electrolyte is 0.15 mol / L, and the additive is 1,3,5-benzenetrithiol (BTT), and the concentration in the electrolyte is 0.15 mol / L.

[0040] Configuration matrix lithium sulfur electrolyte, described matrix lithium sulfur electrolyte is to contain 1mol / L LiTFSI and 0.15mol / LLiNO 3 A solution of DOL and DME (volume ratio of DOL and DME is 1:1). The matrix lithium-sulfur electrolyte was used as a comparative example to set up a control group.

[0041] The lithium-sulfur battery electrolyte (BTT electrolyte) or matrix lithium-sulfur electrolyte containing benzenetrithiol additive obtained in this ex...

Embodiment 2

[0047] Assembling lithium-sulfur CR2032 button cell, including the carbon nanotube positive electrode, diaphragm, lithium metal negative electrode and electrolyte of loading sulfur element, wherein electrolyte is the lithium-sulfur battery electrolyte or matrix electrolysis containing benzenetrithiol additive in embodiment 1 liquid. When the electrolyte is the lithium-sulfur battery electrolyte containing the benzenetrithiol additive in Example 1, it is set as the experimental group, and when the electrolyte is the matrix electrolyte, it is set as the control group.

[0048] In the carbon nanotube positive electrode loaded with sulfur element, the sulfur loading is 1 mg cm -2 , The carbon nanotube paper diameter is 11mm. It is prepared by dissolving sulfur solid powder in carbon disulfide solvent, adding dropwise on carbon nanotube paper, drying in a blast oven at 60-65°C for 12-13 hours to volatilize the solvent.

[0049] The diaphragm is Celgard-2400 with a diameter of 19m...

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Abstract

The invention discloses a triphenylthiol additive-containing lithium-sulfur battery electrolyte and a lithium-sulfur battery. The electrolyte comprises an ether solvent, a lithium salt and an additive, and the additive is 1, 3, 5-benzene trithiol. According to the electrolyte of the lithium-sulfur battery, small organic molecule mercaptan 1, 3, 5-triphenylthiol is used as an additive, and triphenylthiol can quickly generate a uniform organic-inorganic SEI layer with a lithium negative electrode in the lithium-sulfur battery, so that the generation of dendritic crystals of the lithium negative electrode is further improved; and meanwhile, a self-binding oligomerization reaction with a sulfur positive electrode in the lithium-sulfur battery can be carried out to generate phenyl polysulfide, so that the generation of polysulfide is reduced, and the dissolution loss of active substances is reduced. The benzene trithiol forms double-layer protection on the positive electrode and the negative electrode of the lithium-sulfur battery, so that the long cycle stability, coulombic efficiency and rate capability of the lithium-sulfur battery are effectively improved, and the lithium-sulfur battery has commercial application potential.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery electrolyte, and in particular relates to a lithium-sulfur battery electrolyte containing a benzenetrithiol additive and a lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery is a secondary battery composed of lithium metal sheet with the lowest reduction potential (-3.04V vs. NHE) and sulfur element with high specific capacity and high crust content, because of its high specific capacity of 1675mAh g -1 And a larger energy density of 2600Wh kg -1 , is considered the most promising secondary battery. However, due to the dendrite growth problem of the lithium metal negative electrode and the dissolution and shuttling of polysulfides in the sulfur positive electrode, the coulombic efficiency and active material utilization rate of the lithium-sulfur battery are low, and the active material is continuously consumed and lost during the cycle. Therefore, the lo...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0566H01M10/0568H01M10/0569H01M10/052
CPCH01M10/0567H01M10/0566H01M10/0568H01M10/0569H01M10/052Y02E60/10
Inventor 郭玮付永柱张婉莹
Owner ZHENGZHOU UNIV
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