Application of Fullerene Derivatives as Electrolyte Additives and Corresponding Metal Batteries

A technology of fullerene derivatives and electrolyte additives, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of high production cost and difficult application, so as to reduce lithium consumption, reduce dendrites, reduce The effect of the formation of lithium dendrites

Active Publication Date: 2021-08-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the high-concentration electrolyte contains a large amount of lithium salt, the production cost is too high, and it is difficult to apply it in actual production.

Method used

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  • Application of Fullerene Derivatives as Electrolyte Additives and Corresponding Metal Batteries
  • Application of Fullerene Derivatives as Electrolyte Additives and Corresponding Metal Batteries
  • Application of Fullerene Derivatives as Electrolyte Additives and Corresponding Metal Batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Dissolve 1mM fullerene polynitrate (C60(NO2)n) in 1M lithium hexafluorophosphate solution of ethylene carbonate and diethyl carbonate (volume ratio 1:1), stir completely until dissolved, and use the electrolyte Assemble lithium-lithium symmetrical batteries together with lithium sheets and diaphragms, and at 0.5mA cm -2 Under the current density of the cycle test, such as figure 1 As shown, in the experimental group using the ester electrolyte with additives, the symmetrical battery can cycle stably for more than 400 hours and maintain a low overpotential, while the control group has a large overpotential and cannot stabilize Cycle (the electrolyte in the control group is simply 1M lithium hexafluorophosphate ethylene carbonate and diethyl carbonate solution, the volume ratio is 1:1, and other battery structures and parameter settings remain unchanged). The symmetrical battery after the above cycle is disassembled, and the lithium sheet is taken out, such as figure 2 ...

Embodiment 2

[0030] Dissolve 1 mM fullerene fullerene polynitrate (C60(NO2)n) in 1 M dioxolane and ethylene glycol dimethyl ether solution of lithium bistrifluoromethanesulfonimide (volume ratio of 1 : 1), after stirring completely until dissolved, use the electrolyte, lithium sheet and diaphragm to assemble a lithium-lithium symmetrical battery, and use the electrolyte at 1mA cm -2 Cyclic tests are carried out at current densities such as image 3 As shown, in the experimental group using the ether electrolyte with additives, the symmetrical battery can cycle stably for more than 400 hours, while the control group has a large overpotential and cannot cycle stably (the electrolyte in the control group It is simply a 1M dioxolane and ethylene glycol dimethyl ether solution of lithium bistrifluoromethylsulfonimide, the volume ratio is 1:1, and other battery structures and parameter settings remain unchanged). This shows that the additive also has a significant effect in the ether electrolyt...

Embodiment 3

[0032] The selected additive type is fullerene polychloride (C60Cln), and the selected electrolytic solution is dioxolane and ethylene glycol dimethyl ether solution (volume ratio of 1M bistrifluoromethylsulfonimide lithium) 1:1), and other conditions are the same as implementation 1.

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Abstract

The invention belongs to the field of secondary batteries, and discloses the application of fullerene derivatives as electrolyte additives and corresponding metal batteries. Specifically, the fullerene derivatives are added to electrolytes of metal batteries as electrolyte additives. The present invention introduces a fullerene derivative into the electrolyte of a metal battery as an electrolyte additive (in addition to a single-component electrolyte additive composed of a fullerene derivative, it can also be a fullerene derivative and other The composition is combined with a multi-component electrolyte additive), and a corresponding metal battery is obtained. On the one hand, a stable passivation film can be formed in situ by reacting with the metal negative electrode, thereby preventing the direct contact between the metal negative electrode and the electrolyte and reducing the metal negative electrode. consumption, and increase the cycle life of the battery. On the other hand, the reacted fullerene will be deposited on the surface of the metal negative electrode to make the metal evenly deposited, thereby reducing the generation of dendrites and improving the safety performance of the battery.

Description

technical field [0001] The invention belongs to the field of secondary batteries, more specifically, relates to the application of a fullerene derivative as an electrolyte additive and a corresponding metal battery, corresponding to a novel electrolyte additive and application for a metal battery. Background technique [0002] A metal battery is a battery in which a single metal is used as the main component of the negative electrode material. Taking lithium metal battery as an example, metal lithium has a high specific capacity (3860mA / g) and the lowest potential (-3.04 vs standard hydrogen electrode). Lithium metal can be used as a negative electrode in lithium-sulfur batteries, lithium-air batteries, embedded positive-electrode lithium batteries and lithium-oxide positive-electrode batteries, etc. However, the lithium dendrite growth and SEI film rupture that occurred during the cycle of lithium metal negative electrodes have brought safety and cycle problems to lithium m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 谢佳姜智鹏韩智龙孙玉龙
Owner HUAZHONG UNIV OF SCI & TECH
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