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A kind of lithium-ion battery safety additive and the sulfonate imide lithium salt electrolyte containing the additive

A technology of lithium-ion battery and lithium sulfonate imide, which is applied in the field of lithium-ion batteries, can solve the problems of less applied research and reduce the content of flammable solvents, so as to improve thermal stability, reduce free solvent molecules, and suppress the rapid rise of voltage Effect

Active Publication Date: 2021-11-16
广东金光高科股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition to adding additives, there is another type of research to improve the safety of batteries by increasing the concentration of lithium salts. Patent application number 201710141187.0 discloses a method of using high-concentration lithium salts (greater than 3.0mol / L LiTFSI) dissolved in ether solvents to prepare non-toxic lithium salts. Combustible lithium-sulfur battery electrolyte, this method can effectively reduce the content of flammable solvents, thereby improving the thermal stability of the electrolyte, but there are few applications in the field of improving lithium-ion battery electrolyte

Method used

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  • A kind of lithium-ion battery safety additive and the sulfonate imide lithium salt electrolyte containing the additive
  • A kind of lithium-ion battery safety additive and the sulfonate imide lithium salt electrolyte containing the additive
  • A kind of lithium-ion battery safety additive and the sulfonate imide lithium salt electrolyte containing the additive

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Embodiment 1

[0028]A high-concentration lithium sulfonate imide electrolyte for lithium-ion batteries, the addition of lithium salt is 3.0mol / kg, lithium salt is selected lithium bisfluorosulfonate imide (LiFSI) in the present embodiment, and auxiliary agent is ethylene carbonate , the organic solvent is diethyl carbonate, ethylene carbonate (EC):diethyl carbonate (DEC)=1:1.85. The molar ratio of the total content of the organic solvent and additives to the lithium salt is 1:3.

[0029] A three-electrode system with a platinum electrode as the reference electrode, a clean lithium sheet as the working electrode and a counter electrode is used for linear scanning. Technical parameters: the voltage range is from open circuit voltage to 6V, and the scanning speed is 0.5mV / s. The obtained data are as figure 1 shown.

[0030] Carry out combustion experiment with the electrolytic solution of above-mentioned embodiment 1, concrete operation is as follows:

[0031] Prepare some fiberglass wicks ...

Embodiment 2

[0037] A high-concentration lithium sulfonate imide electrolyte solution for lithium-ion batteries with safety additives added, the lithium salt addition is 3.0mol / kg, and the lithium salt is selected from lithium bisfluorosulfonate imide (LiFSI) in this embodiment, and the auxiliary agent Be ethylene carbonate, organic solvent is diethyl carbonate, ethylene carbonate (EC): diethyl carbonate (DEC)=1:1.85, additive three (2,4-di-tert-butylphenyl) phosphite ( TDBPP) is added in an amount of 1% of the electrolyte mass. The molar ratio of the total content of the organic solvent and additives to the lithium salt is 1:3.

[0038] A three-electrode system with a platinum electrode as the reference electrode, a clean lithium sheet as the working electrode and a counter electrode is used for linear scanning. Technical parameters: the voltage range is from open circuit voltage to 6V, and the scanning speed is 0.5mV / s. The obtained data are as figure 1 shown.

Embodiment 3

[0040] The invention relates to a lithium-ion battery high-concentration electrolyte solution added with a safety additive, and the addition amount of the additive tris(2,4-di-tert-butylphenyl) phosphite (TDBPP) is 2% by weight of the electrolyte solution. Others are with embodiment 2.

[0041] Prepare graphite|nickel cobalt lithium manganese oxide 50506 soft-pack battery by injecting the above electrolyte, pre-charge it, charge it with a constant current of 1C to 4.2V after capacity division, and then switch to constant voltage charging, and stop charging when the current is lower than 0.05C , after 1 hour of laying aside, charge with 1C constant current charging for 1 hour, and take the data of charging voltage changing with charging time to make a graph.

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Abstract

The invention relates to a lithium-ion battery safety additive and a sulfonate imide lithium salt electrolyte containing the additive. The lithium-ion battery safety additive includes tris(2,4-di-tert-butylbenzene) with a mass of 1%-4% of the electrolyte base) phosphite and auxiliary agent, auxiliary agent is ethylene carbonate and / or propylene carbonate. The sulfonate imide lithium salt electrolyte includes lithium salt, organic solvent and the above-mentioned lithium ion battery safety additives, and the lithium salt is one or two of sulfonate imide lithium salt and lithium dioxalate borate, lithium tetrafluoroborate, and lithium hexafluorophosphate The combination of the above; the lithium imide sulfonate salt is lithium difluorosulfonate imide or lithium bistrifluorosulfonate imide. The present invention improves the flame retardancy of the battery and suppresses the voltage rise of the battery when the battery is overcharged. When the battery is overcharged, the polymer generated by the electropolymerization reaction greatly increases the impedance of the battery, and inhibits the rapid rise of the battery voltage to protect the battery from overcharging. role. The electrolytic solution of the invention effectively reduces the flammability of the electrolytic solution and improves the thermal stability of the electrolytic solution.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery safety additive and a sulfonate imide lithium salt electrolyte containing the additive. Background technique [0002] In order to cope with the increasingly severe environmental pollution and energy crisis, people's calls for green energy are constantly rising. Among them, lithium-ion secondary batteries are widely used in various portable electronic applications due to their long working life, high working voltage and energy density, and low environmental pollution, and have gradually become one of the main power sources of electric vehicles. one. As countries begin to impose restrictions on gasoline-powered vehicles, lithium-ion electric vehicles may become a future trend, so higher requirements are placed on the performance of lithium-ion batteries in all aspects. [0003] With the development of lithium-ion battery technology ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/058H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 梁慧颖黄文达左晓希李思洋
Owner 广东金光高科股份有限公司
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