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Electrolyte of lithium ion battery discharging at ultra-low temperature

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of low solubility of lithium bisoxalate borate, inability to meet energy density, low concentration and electrical conductivity, etc., so as to broaden the low temperature application range and improve thermal safety. , good film forming ability

Active Publication Date: 2017-08-18
福建省劲德电源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the solubility of lithium bisoxalate borate in carbonate solvent is small, and its low concentration and conductivity cannot meet the requirements of industrialization and increasing energy density; and its low temperature performance is better than that of LiPF 6 Poor electrolyte system for lithium salt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The electrolyte is composed of electrolyte lithium salt, 1,3-dioxane, propylene carbonate, ethylene glycol dimethyl ether, and N,N-dimethyltrifluoroacetamide;

[0019] The electrolyte lithium salt is lithium hexafluorophosphate, lithium bisoxalate borate LiBOB, and lithium oxalate difluoroborate LiODFB are mixed in a mass ratio of 3:1:1;

[0020] 1,3-dioxopentacycline, propylene carbonate, ethylene glycol dimethyl ether, N,N-dimethyltrifluoroacetamide by mass ratio 22:19:27:14;

[0021] The electrolyte lithium salt and 1,3-dioxane are in a mass volume ratio of 4:15, and the unit is g / mL.

[0022] Mix the weighed 1,3-dioxane, propylene carbonate, and ethylene glycol dimethyl ether, and then add the electrolyte lithium salt. After the electrolyte lithium salt is dissolved, add N,N-dimethyltrifluoroethyl Mix and shake the amides and let stand for 24h.

Embodiment 2

[0024] The electrolyte is composed of electrolyte lithium salt, 2-methyltetrahydrofuran, dimethyl carbonate DMC and ethyl methyl carbonate EMC, ethylene glycol dimethyl ether, N,N-dimethyltrifluoroacetamide;

[0025] The electrolyte lithium salt is lithium hexafluorophosphate, lithium bisoxalate borate LiBOB, and lithium oxalate difluoroborate LiODFB are mixed in a mass ratio of 3:1:1;

[0026] 2-methyltetrahydrofuran, dimethyl carbonate DMC and ethyl methyl carbonate EMC (mass ratio 1:1), ethylene glycol dimethyl ether, N,N-dimethyltrifluoroacetamide by mass ratio 22:19: 27:14 mixed.

[0027] The electrolyte lithium salt and 2-methyltetrahydrofuran are in a mass volume ratio of 4:15, and the unit is g / mL.

[0028] The preparation method is similar to that of Example 1. The cyclic ether compound, organic carbonate, and ethylene glycol dimethyl ether are mixed first, then the electrolyte lithium salt is added, and finally the additive is added.

Embodiment 3

[0030] The electrolyte is composed of electrolyte lithium salt, tetrahydrofuran, ethylene carbonate EC and propylene carbonate PC, ethylene glycol dimethyl ether, N,N-dimethyltrifluoroacetamide;

[0031] The electrolyte lithium salt is lithium hexafluorophosphate, lithium bisoxalate borate LiBOB, and lithium oxalate difluoroborate LiODFB are mixed in a mass ratio of 3:1:1;

[0032] Tetrahydrofuran, ethylene carbonate EC and propylene carbonate PC (mass ratio 1:1), ethylene glycol dimethyl ether, and N,N-dimethyltrifluoroacetamide were mixed in a mass ratio of 22:19:27:14.

[0033] The electrolyte lithium salt and tetrahydrofuran are in a mass volume ratio of 4:15, and the unit is g / mL.

[0034] The preparation method is similar to Example 1.

[0035] The electrolyte solution obtained in Examples 1-3 was injected into the self-made square flexible packaging battery according to the conventional battery manufacturing process, wherein the positive electrode of the battery was 92...

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PUM

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Abstract

The invention relates to the technical field of lithium ion battery, and particularly relates to an electrolyte of a lithium ion battery discharging at an ultra-low temperature. The electrolyte is composed of a lithium electrolyte salt, a cyclic ether compound, an organic carbonate, an ethylene glycol dimethyl ether, and a N,N-dimethyl trifluoroacetamide, wherein the lithium electrolyte salt is prepared by mixing lithium hexafluorophosphate, lithium bisoxalatoborate(LiBOB) and lithium oxalate difluoro borate(LiODFB) by a mass ratio of 3:1:1. According to the invention, the freezing point of the mixed solvent can be decreased obviously by mixing the organic additive N,N-dimethyl trifluoroacetamide with an organic carbonate, so that a low temperature electrolyte can be formed; and with the electrolyte prepared from lithium hexafluorophosphate, lithium bisoxalatoborate and lithium oxalate difluoro borate in a reasonable proportion, not only the weakness that the single use of the lithium hexafluorophosphate lacks temperature stability is overcome, but better low-temperature performance and better high-rate discharge performance are exhibited.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution for ultra-low temperature discharge lithium ion batteries. Background technique [0002] Since the commercial use of lithium-ion batteries in the 1990s, they have developed rapidly due to their advantages such as high specific energy, high battery voltage, wide operating temperature range, long storage life, no memory effect, small self-discharge rate, and fast charge and discharge. Developed, at present, lithium-ion batteries have been widely used in electronic products such as mobile phones, notebook computers, digital cameras, etc., and are gradually used as power batteries in electric bicycles, model airplanes, and electric vehicles. With the expansion of the application field of lithium-ion batteries, the requirements for battery performance are also continuously increasing. Some important industrial fields have higher requirements for t...

Claims

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Application Information

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IPC IPC(8): H01M10/0568H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M2300/0025Y02E60/10
Inventor 吴玉双熊伟郭少雄
Owner 福建省劲德电源科技有限公司
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