Flexible lithium metal cell negative pole and preparation method thereof

A lithium metal battery, lithium metal technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of lithium metal negative electrode volume expansion without a better solution, can not completely solve the problem of lithium metal negative electrode volume expansion, to achieve inhibition Effects of dendrite growth, improvement of safety performance and cycle life, and improvement of mechanical properties

Active Publication Date: 2016-07-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above research results have proposed many ideas for inhibiting dendrite growth, but there has been no good solution to the volume expansion problem of lithium metal anodes.
However, lithium-aluminum alloys still cannot completely solve the volume expansion problem of lithium metal negative electrodes, and are eventually replaced by lithium-ion batteries with graphite as negative electrodes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Melt solid metal lithium at 200°C, and then put carbon nanotube paper into liquid lithium to form lithium metal-carbon nanotube composite paper flexible battery negative pole (the content of lithium metal is 98wt.%); the flexible battery negative pole A half-cell with copper current collector is tested, the electrolyte is lithium hexafluorophosphate, ethylene carbonate and diethyl carbonate solution, and the test current is 2.0mAcm -2 .

[0017] The test results show that during the cycle, the volume expansion of the negative electrode of the flexible battery is 1.0%, and no dendrites appear on the lithium metal negative electrode within the cycle range of 400 cycles; All indicators were reduced within 1.0%.

Embodiment 2

[0019] Solid metal lithium is melted at 250°C, and then the graphene paper is put into liquid lithium to form a lithium metal-graphene composite paper flexible battery negative pole (the content of lithium metal is 85wt.%); the flexible battery negative pole is combined with copper The current collector constitutes a half-cell for testing, the electrolyte is a solution of lithium trifluoromethanesulfonate, 1,3-dioxane and 1,2-dimethoxyethane, and the test current is 30mAcm -2 .

[0020] The test results show that during the cycle, the volume expansion of the negative electrode of the flexible battery is 17%, and no dendrites appear on the lithium metal negative electrode within the cycle range of 1000 cycles; All indicators were reduced within 10.0%.

Embodiment 3

[0022] At 1350°C, the solid metal lithium is gasified, and then infiltrated into the oxidized carbon foam spheres to form a lithium metal-foam carbon spherical flexible battery negative electrode (the content of lithium metal is 99.9wt.%); the flexible battery negative electrode is combined with copper collector The fluid constitutes a half-cell for testing, the electrolyte is lithium trifluoromethanesulfonate, dimethoxymethane and tetrahydrofuran solution, and the test current is 500mAcm -2 .

[0023] The test results show that during the cycling process, the volume expansion of the negative electrode of the flexible battery is 50%, and no dendrites appear on the lithium metal negative electrode within the cycle range of 20 cycles; The indicators are reduced within 50.0%.

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Abstract

The invention discloses a flexible lithium metal cell negative pole and a preparation method thereof, and belongs to the technical field of lithium metal cells. The flexible lithium metal cell negative pole is prepared from two-phase structures of lithium metal and a framework material, wherein the content of the lithium metal is 10-99.9wt.%, and the framework material is a conductive material or an insulating material; the flexible lithium metal cell negative pole can be bent within 0-180 degrees, and the losses of electrochemical performance in the bending process is 0.001-50%. Solid metal lithium is melt into liquid or gasified into gas, and then the liquid or the gas is mixed with the framework material, so that the flexible lithium metal cell negative pole is prepared. Compared with a lithium sheet negative pole, the lithium metal cell negative pole effectively improves the mechanical property of lithium metal negative poles, restrains dendritic growth and alleviates the volume swelling of an electrode in the lithium removing and inlaying process; if a flexible positive pole is matched with the negative pole to obtain flexible cells, realization of the business application to flexible wearable electronic equipment with high energy density can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to a flexible lithium metal battery negative electrode and a preparation method thereof. Background technique [0002] The successful commercial use of lithium-ion batteries has brought about the rapid development of portable electronic devices. As the demand for wearable electronics increases, the demand for flexible high-energy-density battery systems is more urgent. Among the known electrode materials, the lithium metal negative electrode is 3860mAh·g -1 The high capacity and the most negative potential (-3.040Vvs. standard hydrogen electrode) have become the "holy grail" in the energy storage industry and have attracted the attention of researchers. The battery energy storage system with metal lithium as the negative electrode and materials such as sulfur and oxygen as the positive electrode has a high theoretical energy density (lithium-sulfur batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393Y02E60/10
Inventor 张强程新兵张睿黄佳琦
Owner TSINGHUA UNIV
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