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Metal lithium secondary battery electrolyte as well as preparation method and application thereof

A secondary battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of low coulombic efficiency, poor cycle performance, poor safety, etc., and achieve the effects of simple technology, easy mass production, and low cost

Active Publication Date: 2019-08-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the problems existing in the technical background, the purpose of the present invention is to solve the problems of poor cycle performance, low coulombic efficiency and poor safety caused by dendrite growth in the negative electrode of the existing metal lithium secondary battery during the charge-discharge cycle. etc., a kind of electrolyte additive for lithium metal negative electrode protection and its application are proposed

Method used

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  • Metal lithium secondary battery electrolyte as well as preparation method and application thereof
  • Metal lithium secondary battery electrolyte as well as preparation method and application thereof
  • Metal lithium secondary battery electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of electrolyte

[0032] Commercially available LiCF 3 SO 3 Preserve under the protection of high-purity argon atmosphere, and reserve;

[0033] Commercially available SCl 2 Preserve under the protection of high-purity argon atmosphere, and reserve;

[0034] Under the protection of a high-purity argon atmosphere, mix MEC and MPC at a volume ratio of 2:1 to obtain a mixed organic solvent, and dissolve lithium salt LiCF into the mixed organic solvent 3 SO 3 , formulated into 0.01mol / L LiCF 3 SO 3 / (MEC+MPC) solution;

[0035] Take an appropriate amount of commercially available SCl 2 , dissolved in the LiCF prepared above 3 SO 3 / (MEC+MPC) solution, and fully stirred to obtain a solution containing 1wt% SCl 2 Additive 0.01mol / L LiCF 3 SO 3 / (MEC+MPC) electrolyte.

[0036] (2) Assembly of battery

[0037] ① Use metal lithium sheet as positive and negative electrode materials, PP film as separator, and LiCF prepared in step (1) of this example 3...

Embodiment 2

[0046] (1) Preparation of electrolyte

[0047] will commercially purchase LiBF 4 Stored with LiTFSI under the protection of high-purity argon atmosphere, for later use;

[0048] Commercially available SOCl 2 , SCl 2 Preserve under the protection of high-purity argon atmosphere, and reserve;

[0049] Under the protection of high-purity argon atmosphere, PC and DEC were mixed at a volume ratio of 2:3 to obtain a mixed solvent, and LiBF 4 and LiTFSI are dissolved into the mixed solvent, fully stirred, and prepared into 5mol / L (LiBF 4 +LiTFSI) / (PC+DEC) solution.

[0050] Take an appropriate amount of commercially available SOCl 2 , dissolved in the above (LiBF 4 +LiTFSI) / (PC+DEC) solution, and fully stirred evenly to obtain a solution containing 0.5wt% SOCl 2 Additive 5mol / L (LiBF 4 +LiTFSI) / (PC+DEC) electrolyte.

[0051] (2) Assembly of battery

[0052] ① With metal lithium sheets as positive and negative electrode materials, with PP / PE film as diaphragm, in step (1) o...

Embodiment 3

[0061] (1) Preparation of electrolyte

[0062] will commercially purchase LiBF 4 Preserve under the protection of high-purity argon atmosphere, and reserve;

[0063] will commercially purchase SO 3 Preserve under the protection of high-purity argon atmosphere, and reserve;

[0064] Under the protection of high-purity argon atmosphere, mix PC and DEC at a volume ratio of 5:1 to obtain a mixed solvent, and LiBF 4 Dissolve in the mixed solvent, fully stir, and prepare 10mol / L LiBF 4 / (PC+DEC) solution.

[0065] Take appropriate amount of commercially available SO 3 , dissolved in the electrolyte solution prepared above, and fully stirred evenly, to obtain a solution containing 4wt% SO 3 Additive 10mol / L LiBF 4 / (PC+DEC) electrolyte.

[0066] (2) Assembly of battery

[0067] ① Use metal lithium sheet as the positive and negative electrode materials, use PP / PE / PP film as the diaphragm, and use the LiBF prepared in step (1) of this example 4 / (PC+DEC) The electrolyte is th...

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Abstract

The invention discloses a metal lithium secondary battery electrolyte as well as a preparation method and an application thereof. The electrolyte comprises lithium salt, an organic solvent and additives, wherein the lithium salt is dissolved in the organic solvent; the additives comprise sulfonyl chloride SO2Cl2 and the like; the concentration of the lithium salt in the electrolyte of the metal lithium secondary battery is 0.01-10 mol / L; and the mass percentage of the additives in the electrolyte is 0.01-5%. The electrolyte can form a layer of stable inorganic salt-containing solid electrolytelayer on the surface of the metal lithium electrode, the dendritic crystal growth can be inhibited in the reciprocating deposition process, and the safety of the metal lithium secondary battery is greatly improved. According to the electrolyte provided by the invention, a mechanical barrier layer or a three-dimensional structure electrode is not needed additionally, so that the technology is simple and is close to the existing industrial production technology, large scale production can be realized easily, and the electrolyte is suitable for the metal lithium secondary battery.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an electrolyte solution for a metal lithium secondary battery and a preparation method and application thereof. Background technique [0002] With the increasing development of electric facilities and large-scale energy storage devices, the actual energy density of traditional lithium-ion batteries has gradually reached the ceiling, and can no longer keep up with the pace of advanced energy storage devices. Lithium metal is known as the "Holy Grail" material for the anode of lithium batteries because of its ultra-high theoretical specific capacity (3860mAh / g) and the lowest redox potential (-3.04V, compared to the standard hydrogen electrode). However, highly active lithium metal can react with most of the salts in aqueous electrolytes and non-aqueous electrolytes, which consumes too much electrolyte and lithium metal, which makes the coulombic efficiency during charge and dischar...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0567H01M10/0525Y02E60/10
Inventor 熊训辉付祥祥王钢罗煜翔林志华杨成浩
Owner SOUTH CHINA UNIV OF TECH
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