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An electrolyte containing nitrile ethyl hydrofluoroether and a lithium secondary battery

A technology of nitrile ethyl hydrofluoroether and electrolyte, which is applied in the direction of secondary battery, secondary battery repair/maintenance, organic electrolyte, etc. It can solve the impact of battery cycle performance, poor compatibility, and is not suitable for high-content addition and use, etc. problem, to achieve the effect of inhibiting irreversible oxidation reaction, reducing inflation rate, and improving capacity recovery rate

Active Publication Date: 2017-01-18
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compatibility between nitrile compounds and graphite is relatively poor, which will affect the cycle performance of the battery and is not suitable for high content addition.

Method used

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  • An electrolyte containing nitrile ethyl hydrofluoroether and a lithium secondary battery
  • An electrolyte containing nitrile ethyl hydrofluoroether and a lithium secondary battery
  • An electrolyte containing nitrile ethyl hydrofluoroether and a lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of nitrile ethyl hydrofluoroether

[0024] Preparation of nitrile ethyl hydrofluoroether reference (Q. Wang, et al., J. Power Sources, 2005, 146:813). chemical structure by 1 H-NMR and 19 Determined by F-NMR, the purity is confirmed by gas chromatography, and the product purity is greater than 99.95%.

[0025] (2) Preparation of electrolyte

[0026] in an argon atmosphere glove box (H 2 O6 (1.0M) mix, CNCH 2 CH 2 OCH(CF 3 ) 2and VC (vinylene carbonate) accounted for 5% and 1% of the total weight, respectively. The above-mentioned raw materials are added in sequence, fully stirred evenly, and the lithium secondary battery electrolyte (free acid<15ppm, moisture<10ppm) of the present invention is obtained. The prepared electrolyte was used for flame retardant test and battery performance test, and the test results are summarized in Table 1.

[0027] (3) Preparation of positive pole piece

[0028] Dissolve 3% polyvinylidene fluoride (PVDF) in 1-me...

Embodiment 2

[0036] The same as the process of embodiment 1, the difference is that CNCH 2 CH 2 OCH(CF 3 ) 2 The added amount is 0.5%.

Embodiment 3

[0038] The same as the process of embodiment 1, the difference is that CNCH 2 CH 2 OCH(CF 3 ) 2 The added amount is 2%.

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Abstract

The invention discloses a nitrile ethyl hydrofluoroether-containing electrolyte and a lithium secondary battery, the electrolyte includes an electrolyte lithium salt, nitrile ethyl hydrofluoroether, a non-aqueous organic solvent and additives, the nitrile ethyl hydrofluoroether has a structure general formula of CNCH2CHR1-O-R2, wherein R1 is any one of H, CH3, C2H5, C3H7, C4H9, OCH3, OC2H5, OC3H7, OCH2CH2OCH3 and OCH2CH2OCH2CH3; and R2 is a fluorine-containing alkyl with the number of carbon atoms of 1-10. The fluorocarbon chain group is conducive to the improvement of compatibility of nitrile compounds and graphite anode, reduction of irreversible electrochemical reaction of the electrolyte on graphite anode surface and improvement of the battery coulombic efficiency.

Description

technical field [0001] The invention relates to the field of lithium ion battery preparation, in particular to an electrolyte solution containing nitrile ethyl hydrofluoroether and a lithium secondary battery. Background technique [0002] Lithium secondary batteries have the advantages of high working voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect, and low environmental pollution. Ideal power source for power tools. With the continuous expansion of the practical application range of lithium secondary batteries, the demand for high energy density lithium secondary batteries is becoming more and more urgent. The energy density of the battery is mainly affected by two factors: the gram capacity of the electrode material and the working voltage. At present, the voltage range of lithium secondary batteries using ternary materials or lithium cobalt oxide cathodes is 3.0-4.2V. On the basis of ensuring the stability of the cathode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 仰永军韩鸿波陈卫谢岚罗乾万华平
Owner GUANGZHOU TINCI MATERIALS TECH
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