Electrolyte of flame-retarded lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as restricting the large-scale development of power batteries, reducing conductivity, and capacity loss.

Active Publication Date: 2011-06-01
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of these phosphorus-based flame retardants is large, and the conductivity will be greatly reduced after adding the electrolyte, and the electrochemical stability is poor. For example, TMP will undergo reduction and decomposition similar to polycarbonate on the surface of the carbon negative electrode, resulting in Capacity loss, decrease

Method used

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  • Electrolyte of flame-retarded lithium ion battery
  • Electrolyte of flame-retarded lithium ion battery

Examples

Experimental program
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Embodiment 1

[0015] in an argon-filled glove box (H 2 O6 ), its concentration is 1M, accounts for 12.5% ​​of total weight, the weight ratio of the add-on of additive fluorocarbonate (FEC) in electrolyte is 3%, the add-on of additive fluorobenzene (FB) in electrolyte The weight ratio is 2%. Add in order according to the above amount, stir well, and then add the nitrogen-containing and fluorine-containing additive CNCH 2 CHFCH 2 CH 2 CN, the weight ratio of the added amount in the electrolyte is 3%, and the lithium-ion battery electrolyte of the present invention can be obtained by continuing to fully stir.

Embodiment 2

[0017] in an argon-filled glove box (H 2 O6 ), its concentration is 1M, accounting for 12.5% ​​of the total weight, the weight ratio of the addition of additive FEC in the electrolyte is 3%, and the weight ratio of the addition of additive FB in the electrolyte is 2%. Add in order according to the above amount, stir well, and then add the nitrogen-containing and fluorine-containing additive CNCH 2 CHFCHFCH 2 CN, the weight ratio of the added amount in the electrolyte is 5%. Continue to fully stir to obtain the lithium ion battery electrolyte of the present invention.

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Abstract

The invention relates to the technical field of electrolyte of flame-retarded lithium ion batteries, in particular to electrolyte of a flame-retarded lithium ion battery. The electrolyte comprises a lithium salt and an organic solvent, and is characterized in that three flame-retarded additives are also added into the electrolyte, wherein the three flame-retarded additives comprise fluoro-carbonate as a first additive, fluoro-benzene as a second additive and a nitrogenous and fluoride bearing organic compound as a third additive. By adopting the technical scheme, the fluoro-carbonate FEC is added into the existing electrolyte system to increase the viscosity of the electrolyte system to a certain extent so that the flash point of the electrolyte system is reduced; the additive fluoro-benzene with comparatively stable electrochemical properties is added to increase the noninflammability of the electrolyte to a certain extent and simultaneously ensure that the viscosity of the electrolyte system is moderate; and the nitrogenous and fluoride bearing organic compound is added to increase the noninflammability of the electrolyte on the basis of guaranteeing the electrochemical properties of the electrolyte.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to an electrolyte for flame-retardant lithium-ion batteries. 【Background technique】 [0002] Lithium-ion batteries emit a lot of heat when they are over-charged and discharged, short-circuited or operated at high current for a long time. These heats become a safety hazard for flammable electrolytes, which may cause catastrophic thermal breakdown and even battery explosion. Therefore, safety issues have become an important prerequisite for innovation in the lithium-ion battery market, especially in applications such as electric vehicles, which put forward higher and newer requirements for battery safety. At present, power batteries have begun to achieve commercial scale. Due to the different materials used by various manufacturers, the batteries will also have great differences. However, no matter what positive and negative electrode materials are used, th...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42
CPCY02E60/12Y02E60/10
Inventor 侯涛
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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