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Ether-ester composite electrolyte solution for stabilizing lithium metal battery

A composite electrolyte and lithium metal battery technology, applied in the field of composite electrolyte, can solve problems such as uneven lithium deposition, safety issues, and obstacles to the commercialization of lithium metal batteries, so as to improve Coulombic efficiency, reduce losses, and facilitate large-scale use and promotional effects

Active Publication Date: 2018-07-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the lithium metal battery was proposed in the 1950s, it has always faced safety issues due to uneven lithium deposition, which has hindered the commercialization of lithium metal batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: preparation composition is ethylene carbonate: diethyl carbonate: diethylene glycol dimethyl ether=4:4:2 (volume ratio), contains the electrolytic solution of 1.0mol / L lithium hexafluorophosphate and 1.5wt% lithium nitrate, And it is tested in a button battery with lithium iron phosphate as the positive electrode and lithium metal as the negative electrode, and the test rate is 1C. When its specific capacity decays to 80% of the initial specific capacity, its cycle life is 545 cycles.

Embodiment 2

[0019] Embodiment 2: preparation is composed of propylene carbonate: dimethyl carbonate: ethylene glycol dimethyl ether=3.5:3.5:3 (volume ratio), containing 1.0mol / L difluorooxalate lithium borate and 1.0wt% lithium nitrate Electrolyte, and use it to test in the button battery that takes lithium iron phosphate as the positive pole and metal lithium as the negative pole, and the test rate is 1C. When its specific capacity decays to 80% of the initial specific capacity, its cycle life is 670 cycles.

Embodiment 3

[0020] Example 3: The preparation composition is fluoroethylene carbonate: diethyl carbonate: tetraethylene glycol dimethyl ether = 1:5:4 (volume ratio), containing 0.5mol / L lithium bistrifluoromethanesulfonylimide , 0.5mol / L lithium dioxalate borate and 4.0wt% lithium nitrate electrolyte, and use it in a button battery with lithium iron phosphate as the positive electrode and lithium metal as the negative electrode for testing, and the test rate is 1C. When its specific capacity decays to 80% of the initial specific capacity, its cycle life is 325 cycles.

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PUM

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Abstract

The invention discloses an ether-ester composite electrolyte solution for stabilizing a lithium metal battery, and belongs to the technical field of charging and discharging high-specific-energy secondary battery. The composite electrolyte solution contains an ether-ester mixed solvent, an electrolyte and lithium nitrate, wherein the electrolyte molar concentration is 0.5-4 mol / L, and the mass fraction of lithium nitrate is 0.01-10% of the ether-ester compound electrolyte solution. The composite electrolyte solution is prepared by introducing lithium nitrate as an additive into the ether-estermixed solvent containing the electrolyte. A metal lithium negative electrode can be effectively protected and is matched in a lithium metal battery with lithium iron phosphate, lithium nickel cobaltmanganate, lithium nickel cobalt aluminate and lithium cobaltate as a positive electrode, the battery cycle life can be improved obviously, good high and low temperature performance is achieved, and the ether-ester composite electrolyte solution is an electrolyte solution with great research value and industrialization potential.

Description

technical field [0001] The invention relates to a composite electrolyte solution for a lithium metal battery, belonging to the technical field of rechargeable high specific energy secondary batteries. Background technique [0002] Energy storage technology plays an extremely important role in the production and effective use of energy, and rechargeable secondary batteries are one of the most important energy storage technologies. With the rapid development of portable consumer electronics, the vigorous promotion of new energy vehicles and the construction of smart grids, the existing lithium-ion batteries can no longer meet the needs of the country and society. The safe secondary battery with higher specific energy has become the focus of attention of the whole society. New breakthroughs require innovation in material systems; therefore, scientific researchers have refocused their attention on the field of lithium metal batteries with lithium metal as the negative electrode...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058
CPCH01M10/056H01M10/058H01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M2300/004H01M2300/0042Y02E60/10Y02P70/50
Inventor 张强张学强闫崇程新兵
Owner TSINGHUA UNIV
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