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Incombustible lithium-ion battery electrolyte and incombustible lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in the field of electrochemical energy storage, can solve problems such as battery performance decline and poor battery cycle stability, and achieve the effects of improving flash point, rapid battery capacity decay, and good high temperature resistance.

Inactive Publication Date: 2018-09-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle stability of the battery obtained in Comparative Example 1 is relatively poor, and the specific capacity of the battery after 40 cycles is only about 100mAh / g (see accompanying drawing 4 of this document), and the battery performance declines seriously

Method used

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  • Incombustible lithium-ion battery electrolyte and incombustible lithium-ion battery
  • Incombustible lithium-ion battery electrolyte and incombustible lithium-ion battery
  • Incombustible lithium-ion battery electrolyte and incombustible lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 Non-combustible lithium-ion battery electrolyte 1 # preparation of

[0058] 30wt% fluoroethylene carbonate (FEC), 20wt% ethylene carbonate (EC), 25wt% dimethyl carbonate (DMC), 25wt% ethyl methyl carbonate (EMC) are uniformly mixed in proportion to obtain a mixed solvent; Lithium hexafluorophosphate (LiPF 6 ) is dissolved in the mixed solvent to obtain the non-combustible lithium-ion battery electrolyte, denoted as electrolyte 1 # , LiPF 6 in electrolyte 1 # The concentration in is 2.0mol / L.

Embodiment 2

[0059] Embodiment 2 Non-combustible lithium-ion battery electrolyte 2 # Preparation of:

[0060] 35wt% fluoroethylene carbonate (FEC), 20wt% ethylene carbonate (EC), 20wt% dimethyl carbonate (DMC), 25wt% ethyl methyl carbonate (EMC) are uniformly mixed in proportion to obtain a mixed solvent; Lithium hexafluorophosphate (LiPF 6 ) is dissolved in the mixed solvent to obtain the non-combustible lithium-ion battery electrolyte, denoted as electrolyte 2 # , LiPF 6 in electrolyte 2 # The concentration in is 1.2mol / L.

Embodiment 3

[0061] Embodiment 3 Non-combustible lithium-ion battery electrolyte 3 # Preparation of:

[0062] Mix 40wt% fluoroethylene carbonate (FEC), 20wt% ethylene carbonate (EC), 20wt% dimethyl carbonate (DMC), 20wt% ethyl methyl carbonate (EMC) according to the proportion, and lithium hexafluorophosphate (LiPF 6 ) is dissolved in the mixed solvent to obtain the non-combustible lithium-ion battery electrolyte, denoted as electrolyte 3 # , LiPF 6 in electrolyte 3 # The concentration in is 1.0mol / L.

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Abstract

The invention discloses an incombustible lithium-ion battery electrolyte and an incombustible lithium-ion battery with the same. The incombustible lithium-ion battery electrolyte is prepared from an organic solvent and lithium salt. The organic solvent is prepared from a fluorocarbonate compound and a carbonate compound. The fluorocarbonate compound is selected from at least one of compounds withthe structural formulas shown as formula I. The carbonate compound is selected from at least one of compounds with the structural formulas shown as formula II and compounds with the structural formulas shown as formula III. The incombustible lithium-ion battery electrolyte has the advantages that the incombustible lithium-ion battery electrolyte is only prepared from the organic solvent and the lithium salt without addition of other additives, so that cycling stability of the battery can be kept, and the defect that existing lithium-ion battery electrolytes are easy to burn and explode in high-temperature environments is overcome.

Description

technical field [0001] The invention relates to a non-combustible lithium ion battery electrolyte and the battery thereof, belonging to the field of electrochemical energy storage. Background technique [0002] Lithium-ion batteries are widely used in 3C electronic products, new energy electric vehicles, aerospace and energy storage fields due to their high energy density, high output voltage, long cycle life, low self-discharge and low environmental pollution. Lithium-ion battery electrolyte plays the role of transferring charge in the battery and is the core part of the lithium-ion battery. It plays a vital role in key evaluation parameters such as specific capacity, cycle efficiency, operating temperature range and safety performance of the battery. . However, in recent years, news reports about fires and explosions caused by lithium-ion batteries are common, mainly because the traditional lithium-ion battery electrolyte has a low flash point and strong volatility, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0037Y02E60/10
Inventor 邓伟侨姜磊
Owner SHANDONG UNIV