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Electrolyte for lithium ion batteries

A technology of electrolyte and electrolyte salt, which is applied in the field of lithium-ion batteries and can solve the problems of lower specific energy density of batteries

Inactive Publication Date: 2020-01-31
明斯特威斯特法伦威廉大学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This also leads to the specific energy density of the battery (Ah kg -1 ) as the whole system decreases

Method used

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  • Electrolyte for lithium ion batteries
  • Electrolyte for lithium ion batteries
  • Electrolyte for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Determination of the conductivity of 1,1,2,2-tetraethoxyethane in various electrolytes

[0057] In 1,1,2,2-tetraethoxyethane and in 1,1,2,2-tetraethoxyethane (TEE), propylene carbonate (PC) and dimethyl carbonate (DMC) Determination of LiTFSI (lithium bis(trifluoromethanesulfonyl)imide (LiN(SO 2 CF 3 ) 2 ) of the conductivity of the 1M solution.

[0058] To prepare the electrolyte, 1,1,2,2-tetraethoxyethane, 50% by weight 1,1,2,2-tetraethoxyethane and 50% by weight propylene carbonate A mixture of esters or a mixture of 1,1,2,2-tetraethoxyethane, propylene carbonate and dimethyl carbonate in a weight ratio of 1:1:1 is charged. Dissolve the corresponding required amount of LiTFSI or LiFSI(LiN(SO 2 f) 2 ), so as to obtain a lithium salt with a concentration of 1M. In the same manner, prepare a solution containing 1M LiTFSI or LiPF in propylene carbonate 6 comparison electrolyte.

[0059] The conductivity of the electrolyte was detected using a 2-electrode conduct...

Embodiment 2

[0064] Determination of the conductivity of 1,1,2,2-tetramethoxyethane in various electrolytes

[0065] Use 2-electrode conductivity measurement cell (2-electrode conductivity measurement cell, RHD instrument, GC / Pt) in the temperature range of -35 ℃ to +60 ℃ described in any embodiment 1 to detect containing 1,1,2, Electrolyte conductivity of 2-tetramethoxyethane (TME).

[0066] Determination of conductivity of 1 M solutions of LiTFSI in 1,1,2,2-tetramethoxyethane (TME), 1 M of LiTFSI in a mixture of TME and PC in each case 50% by weight Conductivity of the solution and conductivity of a 1 M solution of LiTFSI in a 1:1:1 mixture by weight of TME, PC and DMC, LiTFSI in a 1:2:2 mixture by weight of TME, PC and DMC The conductivity of a 1M solution. Table 2 below shows the conductivity in the temperature range from -35°C to +60°C in the corresponding solvents.

[0067] Table 2: Conductivity of 1M LiTFSI in various electrolytes containing 1,1,2,2-tetramethoxyethane (TME)

[0...

Embodiment 3

[0071] The reduction electrochemical stability and cycle characteristics of 1,1,2,2-tetramethoxyethane and 1,1,2,2-tetraethoxyethane were determined using a graphite electrode.

[0072] The determination of the stability of the electrolyte in the half-cell was performed by cyclic voltammetry. In this way, the electrode voltage is continuously varied periodically. For this purpose, a composite electrode with graphite (96%, 350mAh / g; 1.1mAh·cm -2 ) as the working electrode and lithium foil as the three-electrode cell of the counter electrode and the reference electrode (( type). A glass fiber nonwoven fabric was used as a separator.

[0073] To determine the reduction stability and cycling characteristics, the potential between the working electrode and the reference electrode was first lowered from the equilibrium potential (OCP) to 0.025 V vs. Li / Li + , followed again from 0.025V vs. Li / Li + Increase to 1.5V vs. Li / Li + . Repeat twice 0.025V vs. Li / Li + vs. 1.5V vs. L...

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Abstract

The invention relates to an electrolyte for an energy store comprising a conducting salt and a solvent, characterized in that the solvent comprises at least one compound according to the general formula (1), as indicated in the following: wherein R1, R2, R3, R4 are, identically or independently of each other, selected from the group comprising linear or branched C1-6-alkyl, C2-6-alkenyl, C2-6-alkinyl, C3-6-cycloalkyl and / or phenyl, each unsubstituted or mono- or polysubstituted by a substituent selected from the group comprising F, CN and / or C1-2-alkyl, mono- or polysubstituted with fluorine.

Description

technical field [0001] The invention relates to the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries (secondary batteries) are currently the leading technology in the field of rechargeable batteries, especially in the field of portable electronics. Conventional lithium-ion batteries typically use graphite anodes. Charge transport takes place through an electrolyte that includes a lithium salt dissolved in a solvent. Various electrolytes and electrolyte salts are known in the prior art. At present, conventional lithium-ion batteries usually use lithium hexafluorophosphate (LiPF 6 ). [0003] During the operation of the graphite anode, reductive decomposition of the electrolyte occurs. The reactants can form an adherent, electrically insulating but lithium-ion conducting film on the electrode. A suitable electrolyte induces the formation of a solid electrolyte interphase (SEI) on the electrodes. The solid electrolyte interphase then pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0525H01M10/0567
CPCH01M10/052H01M10/0525H01M10/0567H01M2300/0025Y02E60/10C07C43/03H01G11/64C07C43/135H01M10/0569H01M2300/0028
Inventor 斯特凡·勒泽约翰内斯·卡斯纳特舍韦拉尔夫·瓦格纳雅舍尔·阿提克贡特尔·布伦克劳斯马丁·温特
Owner 明斯特威斯特法伦威廉大学