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Electrolyte and lithium-sulfur battery with same

A lithium-sulfur battery and electrolyte technology, applied in the field of lithium-sulfur battery electrolyte auxiliary electrolyte, can solve the problems of low battery life and charge and discharge efficiency, and achieve the effects of good permeability, improved utilization rate, and high initial capacity

Inactive Publication Date: 2014-07-16
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent active material dissolution and diffusion and reaction volume expansion of this electrode reaction lead to low battery life and charge-discharge efficiency.

Method used

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  • Electrolyte and lithium-sulfur battery with same
  • Electrolyte and lithium-sulfur battery with same
  • Electrolyte and lithium-sulfur battery with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of sulfur cathode: 55wt.% sublimated sulfur, 35wt.% super P conductive material and 10wt.% polyvinylidene fluoride (PvDF) were dispersed in N-methylpyrrolidone (NMP) solvent, stirred for 12 hours to The slurry was mixed evenly, coated on the carbon layer-coated aluminum current collector, dried at 60°C for 12 hours, and made into a circular positive electrode sheet with a diameter of 12 mm.

[0021] Under anaerobic and anaerobic conditions, tetraglyme (molecular formula CH 3 O(CH 2 CH 2 O) 4 CH 3 ) and EMITFSI mixed solvent, quantitatively dissolved in 0.8M LiN(SO 2 F) 2 and 3.2M LiN(SO 2 CF 3 ) 2 , stirred to become a clear and transparent liquid that is the target electrolyte. The sulfur electrode prepared above was used as the positive electrode, and metal lithium was used as the counter electrode to assemble a half-cell according to the conventional method. The assembled battery was subjected to cyclic voltammetry and constant current charge-dis...

Embodiment 2

[0023] Using the same positive electrode and assembly method as in Example 1, the target electrolyte was replaced with a mixed solvent of tetraglyme and EMITFSI with a volume ratio of 3:2, and quantitatively dissolved in 0.6M LiN(SO 2 F) 2 and 3.4M LiN(SO 2 CF 3 ) 2 . The initial capacity is slightly lower, 1103mAh / g, and the discharge specific capacity after 50 weeks is 924mAh / g, with excellent cycle performance and capacity retention of more than 86%.

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Abstract

The invention relates to electrolyte and a lithium-sulfur battery with the same. The electrolyte comprises LiN(SO2CF3)2, LiN(SO2F)2, and CH3O(CH2CH2O)nCH3, wherein n is 2-4; imidazolyl ionic liquid is EMITFSI or BMITFSI, and contains 0.1-2.0 M of LiN(SO2F)2 and 1-7 M of LiN(SO2CF3); the volume ratio of an ether solvent to the imidazolyl ionic liquid is 0.25:1 to 4:1. The electrolyte can relieve passivation and polarization of the material when being applied to the lithium-sulfur battery, the utilization rate of active substances of the material is improved, and the diffusion of the active substances is restrained to improve the cycle performance of a battery system. The electrochemical characterization performance of the lithium-sulfur battery is improved, and the lithium-sulfur battery has the characteristics of being high in capacity, good in cycle performance, simple, good in reproducibility and the like.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium-sulfur battery and a lithium-sulfur battery composed thereof, specifically adding a high-efficiency lithium-sulfur battery electrolyte auxiliary electrolyte to the traditional electrolyte solution, and at the same time further improving the overall performance of the battery through solvent optimization performance. Background technique [0002] With the development of society, especially the development of the electric vehicle industry, lithium-ion batteries are facing unprecedented challenges. Due to the limitations of the intercalation-extraction reaction mechanism, it is difficult for traditional cathode materials to make further breakthroughs in energy density. In order to obtain materials with higher capacity, sulfur electrodes based on dissolution-deposition reactions have attracted extensive attention. [0003] Sulfur is a light, non-toxic and abundant element. When it reacts with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0569H01M10/0568
CPCH01M10/052H01M10/0568H01M10/0569H01M2300/0037Y02E60/10
Inventor 高学平胡菁菁李国然叶世海
Owner NANKAI UNIV
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