Low-temperature organic electrolyte taking gamma-butyrolactone as base solvent and application thereof

An organic electrolyte and basic solvent technology, used in electrolytic capacitors, hybrid capacitor electrolytes, circuits, etc., can solve the problems of high melting point, harsh preparation conditions, poor thermal stability, etc., to improve cycle life and improve low-temperature performance. Effect

Active Publication Date: 2010-12-15
SHANGHAI AOWEI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This electrolyte has high conductivity and wide electrochemical stability window, but the lithium salt LiPP 6 It is easy to hydrolyze, the preparation conditions are harsh, and the thermal stability is not good; in addition, because the negative electrode of the traditional lithium-ion battery is graphite, the presence of cyclic ester EC must be present in the solvent to form an effective SEI film on the negative electrode, but the melting point of EC Higher (37°C), it is solid at room temperature, which limits the low-temperature performance of the battery

Method used

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  • Low-temperature organic electrolyte taking gamma-butyrolactone as base solvent and application thereof
  • Low-temperature organic electrolyte taking gamma-butyrolactone as base solvent and application thereof
  • Low-temperature organic electrolyte taking gamma-butyrolactone as base solvent and application thereof

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Experimental program
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Effect test

Embodiment 1

[0030] According to method 1, non-graphite negative lithium-ion batteries were prepared, and assembled into laminated flexible packaging square cells.

[0031] The formula of the electrolyte is as follows: (mass)

[0032] Solvent quality: 100 parts of γ-butyrolactone (GBL);

[0033] Additive quality (based on solvent quality): 2 parts of film-forming stabilizer vinylene carbonate (VC), 1 part of high-temperature stabilizer bisoxalate lithium borate (LiBOB), 1 part of high-voltage overcharge protection agent biphenyl (BP);

[0034] Solute concentration: lithium tetrafluoroborate (LiBF 4 ) concentration 1mol / L (electrolyte).

Embodiment 2

[0036] According to method 1, non-graphite negative lithium-ion batteries were prepared, and assembled into laminated flexible packaging square batteries.

[0037] The formula of the electrolyte is as follows: (mass)

[0038] Solvent quality: 50 parts of γ-butyrolactone (GBL), 50 parts of chain carbonate diethyl carbonate (DEC);

[0039] Additive quality (based on solvent quality): 2 parts of film-forming stabilizer vinylene carbonate (VC), 1 part of high-temperature stabilizer bisoxalate lithium borate (LiBOB), 1 part of high-voltage overcharge protection agent biphenyl (BP);

[0040] Solute concentration: lithium tetrafluoroborate (LiBF 4 ) concentration 1mol / L (electrolyte).

Embodiment 3

[0042] According to method 1, non-graphite negative lithium-ion batteries were prepared, and assembled into laminated flexible packaging square cells.

[0043] The formula of the electrolyte is as follows: (mass)

[0044] Solvent quality: 50 parts of γ-butyrolactone (GBL), 50 parts of chain carboxylate methyl propionate (PA);

[0045] Additive quality (based on solvent quality): 2 parts of film-forming stabilizer vinylene carbonate (VC), 1 part of high-temperature stabilizer bisoxalate lithium borate (LiBOB), 1 part of high-voltage overcharge protection agent biphenyl (BP);

[0046] Solute concentration: lithium tetrafluoroborate (LiBF 4 ) concentration 1mol / L (electrolyte).

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Abstract

The invention discloses low-temperature organic electrolyte taking gamma-butyrolactone as a base solvent and a preparation method thereof. The organic electrolyte comprises a solvent and lithium tetrafluoroborate (LiBF4), wherein the solvent is a mixture of cyclic gamma-butyrolactone, chain carbonic ester and chain carboxylic ester. The organic electrolyte is suitable to be used by a non-graphite-based cathode lithium ion capacitor, a non-graphite-based cathode lithium ion battery and a non-graphite-based cathode lithium ion system. Compared with the formula of the traditional electrolyte, the organic electrolyte greatly improves the low-temperature performance of an electrochemical device and prolongs the cyclic service life of the electrochemical device on the basis of ensuring the electrochemical performance, and meanwhile is favorable for the safety of the electrochemical device; and the formula of the electrolyte is suitable for the non-graphite-based cathode lithium ion capacitor, the non-graphite-based cathode lithium ion battery and the non-graphite-based cathode lithium ion capacitance battery.

Description

technical field [0001] The invention relates to an organic electrolytic solution, especially the electrolytic solution capable of improving the low-temperature performance and cycle life of non-graphite-based lithium ion capacitors, non-graphite-based negative electrode lithium-ion batteries and capacitor batteries. Background technique [0002] Supercapacitor (Supercapacitor) is a new type of electrochemical energy storage device between traditional capacitors and batteries. First, compared to traditional capacitors, supercapacitors have higher energy density; second, compared to batteries, supercapacitors have higher power density and better cycle life. Therefore, it combines the advantages of traditional capacitors and batteries, is a chemical power source with broad application prospects, and belongs to the emerging category of power compensation and energy storage devices. In recent years, the development of supercapacitor technology has attracted widespread attention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01G9/038H01G11/60
CPCY02E60/10Y02E60/13
Inventor 吴明霞安仲勋曹小卫杨恩东华黎
Owner SHANGHAI AOWEI TECH DEV
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