Flame retardant long-life electrolyte and lithium ion battery using same

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of battery performance degradation, ionic conductivity decrease, and permanent damage of SEI film

Inactive Publication Date: 2012-11-14
LONG POWER SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, VC cannot be regenerated after the formation of the SEI film through battery formation, thus causing permanent damage to the SEI film by TMP
These issues eventually lead to reduced battery performance and premature battery failure
In addition, we found that LiBF4 can not only undergo a reduction reaction on the surface of the negative electrode to form a more stable SEI film than organic additives such as VC, but also repair the organic film damaged by flame retardant additives and make it more stable. However, LiBF4 will make the entire electrolytic The ionic conductivity of the solution is reduced, so it needs to be used in conjunction with other salts, and the amount added should be controlled within a certain range

Method used

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  • Flame retardant long-life electrolyte and lithium ion battery using same
  • Flame retardant long-life electrolyte and lithium ion battery using same

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Embodiment 1 A kind of flame-retardant electrolytic solution containing single halogenated ketone film-forming additive and compound salt

[0057] The electrolyte composition is: 1.0M / 0.2M LiPF 6 / LiBF 4 , EC / EMC=3 / 7(v / v), fluoroacetone (FA) 2%, TMP 3%, the measured ionic conductivity of the electrolyte at room temperature is 7.2*10-3S / cm.

Embodiment 2

[0058] Embodiment 2 A kind of flame-retardant electrolytic solution containing single film-forming additive and compound salt

[0059] The electrolyte composition is: 1.1M / 0.2M LiPF 6 / LiBF 4 , EC / EMC=3 / 7(v / v), ethylene carbonate (VC) 2%, TMP 3%, the measured ionic conductivity of the electrolyte at room temperature is 6.8*10-3S / cm.

Embodiment 3

[0060] Embodiment 3 A kind of flame-retardant electrolytic solution containing composite film-forming additive and composite salt,

[0061] The electrolyte composition is: 1.1M / 0.2M LiPF 6 / LiBF 4 , EC / EMC=3 / 7(v / v), fluoroacetone (FA) 1%, ethylene carbonate (VC) 1%, TMP 3%, the measured ionic conductivity of the electrolyte at room temperature is 6.7*10- 3S / cm.

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Abstract

The invention discloses a multi-component electrolyte for lithium ion batteries. The multi-component electrolyte is good in ionic conductivity and is characterized by containing the following multiple components: (1) carbonic ester solvents, (2) flame retardant additives, (3) single or composite film-forming additives and (4) composite lithium salt. One of the film-forming additives (3) is selected from haloketones, the general formula of the haloketones is normally: XH2mCm-(C=O)-CnH2n+1, wherein both m and n are natural numbers, m is identical to or different from n, and X can be one of F, Cl, Br and I. The electrolyte can improve safety, magnification performance and cycle life of the lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a non-aqueous electrolyte that improves the flame retardancy, rate performance and cycle life of lithium ion batteries. Background technique [0002] Lithium-ion batteries have a history of more than 20 years since they were developed and commercialized by Sony Corporation of Japan in 1990. Due to its higher volume specific energy, weight specific energy and good environmental protection, it is gradually replacing traditional lead-acid batteries, nickel-cadmium and nickel-metal hydride batteries, and is widely used in portable 3C electronic devices such as mobile phones and notebook computers. It quickly occupied a large market and developed rapidly. In addition, lithium-ion batteries are used in electric tools, electric bicycles and hybrid vehicles. The development of electric vehicles is an industry that has invested heavily in recent years. The successful developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 孙喜梅黄碧英
Owner LONG POWER SYST SUZHOU
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