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An electrolyte for a metal lithium secondary battery and a metal lithium secondary battery using the electrolyte

A secondary battery and metal lithium technology, applied in the direction of fuel cell half-cells and secondary battery-type half-cells, secondary batteries, secondary battery repair/maintenance, etc., can solve difficult practical applications and high cost , cumbersome preparation process and other issues

Inactive Publication Date: 2019-01-22
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this complex additive molecule is difficult to synthesize, the preparation process is cumbersome, and the cost is expensive, so it is difficult to go to practical application (patent document: CN108054429A)

Method used

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  • An electrolyte for a metal lithium secondary battery and a metal lithium secondary battery using the electrolyte
  • An electrolyte for a metal lithium secondary battery and a metal lithium secondary battery using the electrolyte
  • An electrolyte for a metal lithium secondary battery and a metal lithium secondary battery using the electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Lithium bistrifluoromethanesulfonylimide (LiTFSI) was added to a mixed solvent of 1,3-dioxolane (DOL)-ethylene glycol dimethyl ether (DME) (the volume ratio of DOL and DME was 1:1 ), was prepared into an electrolyte solution of 1mol / L, then added dithiooxamide, stirred and dissolved to form a uniform solution (the concentration of dithiooxamide was 0.1mg / mL (the concentration was the concentration of the sulfur-containing conjugated additive) The ratio of the mass to the volume of the non-aqueous solvent, the same below)). A double-lithium symmetrical battery was assembled with the above-mentioned electrolyte, and the battery was charged and discharged. The current density is 2mA cm -2 , the amount of cycled lithium metal is controlled to be 1mAh cm -2 .

Embodiment 2

[0060] Lithium bistrifluoromethanesulfonylimide (LiTFSI) was added to a mixed solvent of 1,3-dioxolane (DOL)-ethylene glycol dimethyl ether (DME) (the volume ratio of DOL and DME was 1:1 ), was prepared into a 1mol / L electrolyte solution, then dithiooxamide was added, stirred and dissolved until a uniform solution was formed (the concentration of dithiooxamide was 1mg / mL). A double-lithium symmetrical battery was assembled with the above-mentioned electrolyte, and the battery was charged and discharged. The current density is 2mA cm -2 , the amount of cycled lithium metal is controlled to be 1mAh cm -2 . Cycle performance such as image 3 As shown in b, the SEM image of the lithium sheet disassembled after 20 cycles is as follows image 3 as shown in a.

Embodiment 3

[0062] Lithium bistrifluoromethanesulfonylimide (LiTFSI) was added to a mixed solvent of 1,3-dioxolane (DOL)-ethylene glycol dimethyl ether (DME) (the volume ratio of DOL and DME was 1:1 ), was prepared into a 1mol / L electrolyte solution, then dithiooxamide was added, stirred and dissolved until a uniform solution was formed (the concentration of dithiooxamide was 5mg / mL). A double-lithium symmetrical battery was assembled with the above-mentioned electrolyte, and the battery was charged and discharged. The current density is 2mA cm -2 , the amount of cycled lithium metal is controlled to be 1mAh cm -2 .

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Abstract

An electrolyte for a metal lithium secondary battery containing a sulfur-containing conjugated structure additive and a metal lithium secondary battery using the electrolyte are disclosed. The electrolyte for metal lithium secondary battery is composed of lithium salt, non-aqueous solvent and sulfur-containing conjugated structure additive, and the mass ratio of the sulfur-containing conjugated structure additive to the volume of the non-aqueous solvent is 0.01-100mg / mL. The invention can effectively inhibit the growth of lithium dendrite in a metal lithium secondary battery by selecting an electrolyte containing a specific amount of a specific additive component, thereby improving the cycling performance and safety of the metal lithium secondary battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrolyte solution for a metal lithium secondary battery containing a sulfur-containing conjugated structure additive and a metal lithium secondary battery using the electrolyte. Background technique [0002] In recent years, environmental pollution and the smog it causes have become a major hidden danger to national health, and a considerable part of the pollution comes from the burning of fossil fuels. In order to solve the environmental problems caused by fossil fuels, various green energy sources have gradually come into people's field of vision. Among them, the green energy lithium battery has been widely used in the fields of energy storage, communication and transportation due to its high energy density and small self-discharge. In lithium batteries, graphite, the traditional anode material, has a lower capacity density (372mA h g -1 ), there is a tend...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/052H01M12/08
CPCH01M10/052H01M10/0567H01M10/4235H01M12/08H01M2300/0025Y02E60/10
Inventor 王骞杨程凯刘文申兰耀周恒辉
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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