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Low temperature electrolytic solution for ferrous phosphate lithium ion battery

A lithium-ion battery and lithium iron phosphate technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low electronic conductivity and influence on electrical properties, and achieve the effect of improving electrical conductivity and good electrical conductivity

Inactive Publication Date: 2009-01-21
SHENZHEN HAIYING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, lithium iron phosphate LiFePO 4 The electronic conductivity is low, especially at low temperature, the electronic conductivity is lower, and the electrical properties are affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The low-temperature electrolyte solution for the lithium iron phosphate lithium-ion battery includes: ethylene carbonate, dimethyl carbonate, lithium hexafluorophosphate, ethyl butyrate, propylene carbonate, fluoroethylene carbonate, and lithium bisoxalate borate.

[0028] Since the electrolyte contains propylene carbonate and ethyl butyrate with lower melting points, the conductivity of the electrolyte at low temperatures can be effectively improved.

[0029] Experiments have proved that the electrolyte still has high conductivity when it is lower than -30°C, ensuring that the discharge capacity of lithium iron phosphate lithium ion battery at -30°C is greater than 80% of the discharge capacity at room temperature 25°C, and at -40°C The discharge capacity is greater than 60% of the discharge capacity at room temperature 25°C.

[0030] In addition, film-forming additives, such as but not limited to: fluoroethylene carbonate and lithium bisoxalate borate, can also be add...

Embodiment 2

[0035] As a preferred embodiment, the lithium iron phosphate lithium ion battery electrolyte of this embodiment includes: lithium hexafluorophosphate, ethylene carbonate, ethyl butyrate, propylene carbonate, dimethyl carbonate, fluoroethylene carbonate, bis Lithium borate oxalate. Wherein the proportioning of each component is as follows:

[0036] The content of ethylene carbonate is 25~35w.t.%, the content of propylene carbonate is 5~10w.t.%, the content of dimethyl carbonate is 15~30w.t.%, the content of ethyl butyrate is 30~40w.t.%, the content of fluoroethylene carbonate is 1~5w.t.%, the content of lithium bisoxalate borate is 1~5w.t.%, the concentration of lithium hexafluorophosphate is 0.7~1.0mol / L .

[0037] In order to ensure the high stability of the lithium battery, the purity of each component is greater than 99.95%, the mass percentage of water is less than 20 parts per million, and each component reaches the battery reagent grade.

[0038] Due to the addition o...

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Abstract

The invention relates to the field of lithium batteries, disclosing a low-temperature electrolyte applied to a LiFePO4 Li-ion battery. The electrolyte is composed of ethylene carbonate, propylene carbonate, ethyl butyrate, fluoroethylene carbonate, lithium bis(oxalate)borate and lithium hexafluorophosphate. The electrolyte can remarkably improve the electric performance of the LiFePO4 Li-ion battery under low temperature, and ensure sound cyclic performance of the battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to an electrolyte solution for lithium ion batteries. Background technique [0002] Due to problems such as technology and cost, lithium-ion batteries have remained in the field of small-scale batteries. With the rapid development of key material technology and battery technology of lithium-ion batteries, they are used in vehicles, electric tools, electric toys, lighting batteries, Large batteries and battery packs in the field of electric boats have begun to become popular in daily life. [0003] At present, the large batteries that can be used as electric vehicle batteries mainly include: valve-regulated lead-acid batteries, nickel-hydrogen batteries, nickel-cadmium batteries and lithium-ion secondary batteries, and in practical applications, lead-acid batteries and nickel-hydrogen batteries are more widely used. for extensive. [0004] However, from the perspective of electroch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/0567H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 殷振国郭永兴陶芝勇曾坚义
Owner SHENZHEN HAIYING TECH
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