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Metal lithium battery and modified electrolyte thereof

An electrolyte and lithium secondary battery technology, applied in the manufacture of lithium batteries, secondary batteries, electrolyte batteries, etc., can solve the problems of cycle performance decline, battery capacity attenuation, etc., and achieve the effect of high Coulomb efficiency and cycle stability

Pending Publication Date: 2021-01-26
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This "dead lithium" cannot continue to participate in the electrode reaction, so that the capacity of the battery will decay, and the cycle performance will also be affected and decreased.

Method used

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  • Metal lithium battery and modified electrolyte thereof
  • Metal lithium battery and modified electrolyte thereof
  • Metal lithium battery and modified electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of electrolyte

[0020] Under an atmosphere of high-purity argon (99.999% by volume, commercially available), mix 0.005 mmol of cetyltrimethylammonium chloride (CTAC) with 1 mL of 1 mol / L LiTFSI in DME / DOL (volumes of DME and DOL The ratio is 1:1) stirring and mixing, the stirring speed is 800r / min, the time is 3h, the stirring temperature is 25°C, and the electrolyte S1 is obtained.

[0021] (2) Assembly of metal lithium battery

[0022] Using metal lithium (commercially purchased) with a diameter of 11 mm as the positive and negative electrodes, and the electrolyte S1 as the electrolyte, an experimental button battery B1 was assembled in a glove box filled with an argon atmosphere.

[0023] The constant current charge and discharge performance test was carried out on the LAND CT2001A tester, and the charge and discharge current density was 1mA cm -2 . The cycle stability time and overpotential of the above-mentioned batteries were detected respectiv...

Embodiment 2

[0025] Others are the same as in Example 1, except that the addition amount or concentration of CTAC is changed to 10mmol / L; the stirring conditions are fine-tuned as follows: stirring speed 600r / min, time 1h, temperature 30°C. The resulting assembly is a button battery B2.

[0026] Such as figure 2 As shown, the button battery B2 has a stable cycle time of more than 400 hours, and the overpotential is 50mV.

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PUM

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Abstract

The invention discloses a metal lithium battery and a modified electrolyte thereof, and a preparation method of the electrolyte comprises the following steps: forming a mixed solution from dimethyl ether (DME) and 1, 3-dioxolane (DOL) in a volume ratio of about 1: 1; adding lithium bis (trifluoromethanesulfonyl) imide (LiTFSI) and cetyltrimethylammonium chloride (CTAC) into the mixed solution, wherein the concentration of the LiTFSI in the solution is about 1 mol / L, and the concentration of the CTAC in the solution is 4-10 mmol / L. The modified electrolyte provided by the invention can effectively overcome the defect of safety problem caused by short circuit of the battery due to local formation of lithium dendrites in the existing metal lithium negative electrode material, and also can enable the metal lithium battery to have relatively high coulombic efficiency and cycling stability.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an electrolyte solution for lithium metal batteries. Background technique [0002] The instability of metal lithium anode during secondary battery cycling is the biggest problem that limits its application. During the cycling process, the deposition of metal lithium is not uniform, which will cause the growth of lithium dendrites, which will pierce the separator and make the positive and negative materials contact, causing safety problems such as battery short circuit or even explosion. In addition, the growing lithium dendrites break down to form "dead lithium". This "dead lithium" cannot continue to participate in the electrode reaction, so that the capacity of the battery will decay, and the cycle performance will also be affected and decreased. Therefore, finding ways to inhibit the growth of lithium dendrites is a key issue in the development of lithium secondary batteries. Cont...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/058H01M10/052H01M10/42
CPCH01M10/0567H01M10/058H01M10/052H01M10/4235Y02E60/10Y02P70/50
Inventor 薛晴王欣然李慧吴川白莹徐丽高铭达孙宇恒吴锋
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD