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High-cycle-stability lithium-sulfur electrolyte

A technology of cycle stability and electrolyte, applied in lithium batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problem of not greatly improving the cycle stability of lithium-sulfur batteries, and achieve broad industrialization prospects, low cost, strong The effect of chemical adsorption

Active Publication Date: 2018-08-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this did not greatly improve the cycle stability of lithium-sulfur batteries (Chen Y, et al. PolysulfideStabilization: A Pivotal Strategy to Achieve High Energy Density Li–S Batteries with Long Cycle Life[J]. Advanced Functional Materials, 2018.)

Method used

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  • High-cycle-stability lithium-sulfur electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 0.1 mol of lithium trifluoromethanesulfonate in a glove box for sufficient drying, then add 100 mL of ethylene glycol dimethyl ether and 1,3 dioxolane mixed organic solvent with a volume ratio of 1:1 , fully stirred until completely dissolved, then added 0.5g of carbon quantum dots, stirred and dispersed evenly to obtain a brown-yellow lithium-sulfur electrolyte.

[0028] figure 1 The electrochemical rate performance diagram of the lithium-sulfur electrolyte prepared in Example 1 applied to the lithium-sulfur battery. It can be seen from the figure that the specific capacities of the battery for charge and discharge at 0.2, 0.5, 1 and 2C are 1049, 947, 842 and 644mAhg respectively -1 , when charging with a small rate of 0.2C, there is still 1100mAh g -1 , indicating that the battery has good rate performance and cycle stability.

[0029] figure 2 The electrochemical cycle performance diagram of the lithium-sulfur electrolyte prepared for Example 1 applied to th...

Embodiment 2

[0031] This example is basically the same as Example 1, the only difference is that 0.1 g of carbon quantum dots is added to obtain a bright yellow electrolyte.

[0032] image 3 The electrochemical rate performance diagram of the lithium-sulfur electrolyte prepared for Example 2 applied to the lithium-sulfur battery. It can be seen from the figure that the specific capacities of the battery for charging and discharging at 0.2, 0.5, 1 and 2C are 1041, 853, 790 and 610mAhg respectively. -1 , when charging with a small rate of 0.2C, it is still stable at 1030mAh g -1 , indicating that the battery has good rate performance and cycle stability.

Embodiment 3

[0034] This embodiment is basically the same as Embodiment 1, the only difference is that 1g of carbon quantum dots is added to obtain a dark brown electrolyte.

[0035] Figure 4 The electrochemical rate performance diagram of the lithium-sulfur electrolyte prepared for Example 3 applied to the lithium-sulfur battery. It can be seen from the figure that the specific capacity of the battery for charging and discharging at 0.2, 0.5, 1 and 2C is 1000, 820, 760 and 650mAhg respectively -1 , when charging with a small rate of 0.2C, it is still stable at 910mAh g -1 , indicating that the battery has good rate performance and cycle stability.

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Abstract

The invention discloses a high-cycle-stability lithium-sulfur electrolyte. The electrolyte consists of an ether type organic solvent which comprises glycol dimethyl ether and 1, 3 dioxolame at the volume ratio of 1 to 1, 0.5-2M of lithium salt and 0.1-1mass% of carbon quantum dots. By adding carbon quantum dots to the electrolyte to be used as an additive, the carbon quantum dots can capture and dissolve lithium polysulfide to form a blocking layer, thereby preventing further dissolving out of lithium polysulfide, and enabling the battery to be super high in stability; and meanwhile, by virtueof the carbon quantum dots, subsequent lithium polysulfide dissolution and diffusion can be prevented, and a condition that lithium polysulfide reaches a metal lithium negative electrode to be subjected to a shuttle effect therewith can be avoided, thereby enabling the battery to be relatively high in coulombic efficiency and stable in cycle performance. The lithium-sulfur electrolyte is simple in process, low in cost and suitable for industrialization.

Description

technical field [0001] The invention belongs to the technical field of battery electrolyte materials, and relates to a lithium-sulfur battery electrolyte, in particular to a lithium-sulfur electrolyte with high cycle stability. Background technique [0002] Lithium-ion batteries (LIBs) based on intercalation reactions have reached the limit of their capacity density and cannot meet the demands of rapidly developing electric vehicles, large-scale energy storage devices, and advanced portable electronics. Lithium-sulfur batteries (Li-S) are considered to be promising candidates for next-generation electrochemical energy storage technologies due to their overwhelming advantages in energy density. In addition, the high natural abundance, cheapness, and environmental friendliness of sulfur make lithium-sulfur batteries more attractive and commercially competitive than current lithium-ion batteries. However, a series of problems still hinder the practical application of lithium-s...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/052H01M10/0567H01M2300/0025Y02E60/10
Inventor 付永胜吴震汪信朱俊武潘书刚欧阳晓平许方朱嘉桐杨宇豪袁磊韩秋瑞兰颖洁
Owner NANJING UNIV OF SCI & TECH
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