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Low-temperature electrolyte for lithium iron phosphate battery

A lithium iron phosphate battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as the inability to effectively improve the low-temperature performance of the electrolyte, battery performance, etc., to broaden the range of low-temperature liquid phase, improve low-temperature conductivity, and increase the degree of solvation Effect

Inactive Publication Date: 2016-11-16
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology relates to an improved solution for making batteries that have better properties than previously possible due to lower temperatures caused during their manufacturing process or use. It involves adding certain chemical substances into the elecrosis fluid used inside the cell instead of just mixing them together beforehand. These added compounds help decrease crystal formation when there're no water being absorbed from outside. By combining these ingredients properly, it becomes more effective at preventing deteriorating electrical characteristics such as short circuit current flow and reduced energy storage capabilities.

Problems solved by technology

This patents discuss different ways how an ion (Li) redox flow cell works properly when there're no electric connection between its components or if some parts start working well but lose their ability due to high ambient temperatures during operation. Existing solutions involve adding more expensive materials like LiFePO4. Additionally, these methods may result in decreased energy density and reduced life span of the cells themselves.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A low-temperature electrolyte solution for a lithium iron phosphate battery, the raw materials of which are composed of electrolyte lithium salt, organic solvent, low-temperature additive and film-forming additive, and the electrolyte lithium salt is LiPF 6, and the concentration of the electrolyte lithium salt in the organic solvent is 1mol / L, the composition of the organic solvent and its volume ratio are: ethylene carbonate 25, ethyl methyl carbonate 40, dimethyl carbonate 35, the low temperature additive It is tetraethylammonium tetrafluoroborate, whose mass accounts for 1.5% of the total mass of the electrolyte, and the film-forming additive is fluoroethylene carbonate, whose mass accounts for 2% of the total mass of the electrolyte.

[0041] During preparation, the electrolyte lithium salt is first dissolved in an organic solvent to form a mixed solution, and then a film-forming additive is added to the mixed solution and stirred evenly to obtain a low-temperature ...

Embodiment 2

[0044] With embodiment 1, the difference is that,

[0045] The composition and volume ratio of the organic solvent are: 15 ethylene carbonate, 45 ethyl methyl carbonate, 35 dimethyl carbonate, 20 ethyl butyrate, the low-temperature additive is 15-crown (ether)-5, Its mass accounts for 5% of the total mass of the electrolyte.

[0046] The 0.3C discharge capacity of the lithium iron phosphate battery prepared by using the electrolyte in this implementation is 62.5% of the normal temperature discharge capacity at -20°C.

Embodiment 3

[0048] With embodiment 1, the difference is that,

[0049] The raw material composition of the electrolyte also includes a wetting additive, the wetting additive is trimethylsilanol, and its mass accounts for 2% of the total mass of the electrolyte;

[0050] During preparation, the electrolyte lithium salt is first dissolved in an organic solvent to form a mixed solution, and then a film-forming additive and a wetting additive are added to the mixed solution and stirred evenly to obtain a lithium-ion battery low-temperature electrolyte.

[0051] The discharge capacity of the lithium iron phosphate battery prepared by using the electrolyte of this example at -20°C at 0.3C is 67% of the normal temperature discharge capacity.

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Abstract

The invention provides a low-temperature electrolyte for a lithium iron phosphate battery. The low-temperature electrolyte is prepared from the following raw materials: an electrolyte lithium salt, an organic solvent and a low-temperature additive, wherein the low-temperature additive is at least one of triethanolamine, tetraethylammonium tetrafluoroborate, 12-crown (ether)-4, 15-crown (ether)-5 and 18-crown (ether)-6; and the mass of the low-temperature additive is 0.1%-5% of total mass of the electrolyte. By the low-temperature electrolyte, the low-temperature performance of the battery is effectively improved.

Description

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Claims

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Application Information

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Owner DONGFENG COMML VEHICLE CO LTD
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