Low-temperature electrolyte of lithium iron phosphate battery

A lithium iron phosphate battery and electrolyte technology, applied in the fields of material chemistry and electrochemistry, can solve the problems of easy generation of acidic impurities and poor electrical conductivity, achieve good normal temperature charge and discharge, ensure electrical conductivity, and reduce low-temperature charge transfer impedance. Effect

Inactive Publication Date: 2014-01-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional, single lithium hexafluorophosphate has poor conductivity in the electrolyte and is easy to generate acidic impurities

Method used

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  • Low-temperature electrolyte of lithium iron phosphate battery
  • Low-temperature electrolyte of lithium iron phosphate battery
  • Low-temperature electrolyte of lithium iron phosphate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 10% ethylene carbonate, 35% ethyl methyl carbonate, 25% methyl formate and 25% ethyl butyrate according to volume percentage, stir and mix evenly in a glove box with humidity less than 10ppm, while the solution temperature Controlled at 25°C, configured as a solvent for the electrolyte; then add 1mol / L lithium salt LiPF in portions 6 After the electrolyte is completely dissolved, add 5% vinylene carbonate and 5% propylene sulfite. After the electrolyte was left to stand for 24 hours, the low-temperature electrolyte of the lithium iron phosphate battery of this embodiment was obtained.

Embodiment 2

[0034] Take 10% methyl propyl fluorocarbonate, 20% ethyl methyl carbonate, 25% methyl formate and 36% methyl butyrate according to volume percentage, stir and mix evenly in a glove box with humidity less than 10ppm, At the same time, the temperature of the solution is controlled at 25°C, and it is configured as a solvent for the electrolyte; then 1mol / L lithium salt LiPF is added in portions 6 , After the electrolyte is completely dissolved, add 5% vinylene carbonate and 4% propylene sulfite as additives. After the electrolyte was left to stand for 24 hours, the low-temperature electrolyte of the lithium iron phosphate battery of this embodiment was obtained.

Embodiment 3

[0036] Take 10% methyl propyl fluorocarbonate, 20% ethyl methyl carbonate, 25% methyl acetate and 36% methyl propionate respectively according to volume percentage, stir and mix evenly in a glove box with humidity less than 10ppm, At the same time, the temperature of the solution is controlled at 25°C, and it is configured as a solvent for the electrolyte; then 0.8mol / L lithium salt LiPF is added in portions 6 , 0.11mol / L LiBF 4 , After the electrolyte is completely dissolved, add 5% vinylene carbonate and 4% propylene sulfite as additives. After the electrolyte was left to stand for 24 hours, the low-temperature electrolyte of the lithium iron phosphate battery of this embodiment was obtained.

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Abstract

The invention relates to a low-temperature electrolyte of a lithium iron phosphate battery. The low-temperature electrolyte includes the following solvents of, by volume, 30%-45% of carbonic ester solvent, 50%-65% of carboxylic ester solvent and 4%-10% of additive. The solvents contain solute lithium, the lithium is LiPF6 or a combination of the LiPF6 and LiBF4, and the concentration of the lithium is 0.8-1.4mol/L. The low-temperature electrolyte is a nonaqueous electrolyte, through optimization of kinds and proportioning combination of the solvents of the electrolyte, low-viscosity carbonic ester and low-melting-point carboxylic ester are selected and used, the freezing point at low temperature is lowered, and low-temperature conductivity is increased. According to the low-temperature electrolyte, the lithium of the electrolyte is optimized, the low-temperature additive is selected preferably, normal-temperature circulation ratio performance of the electrolyte is maintained, and meanwhile, the low-temperature capacity retention ratio of the lithium iron phosphate battery and the ratio performance of the lithium iron phosphate battery are improved. The commercial application requirements of the electrolyte can be met, the low-temperature performance of the electrolyte is improved particularly, and therefore the electrolyte is suitable for aerospace and plateau alpine environment.

Description

technical field [0001] The invention relates to a lithium iron phosphate technology, specifically a low-temperature electrolyte of lithium iron phosphate, belonging to the fields of material chemistry and electrochemistry. Background technique [0002] The increasing depletion of energy sources, the development of new vehicles and modern communication technologies lead to a rapidly increasing demand for lithium-ion batteries. Lithium-ion batteries have been widely used in mobile phones, portable computers, and measuring instruments because of their outstanding advantages such as high energy density, high working voltage, long cycle life, and no environmental pollution. There are broad application prospects in energy vehicles. [0003] When communication devices such as mobile phones and automobiles using lithium-ion batteries operate in winter or in a cold environment, if the power supply cannot provide sufficient energy output, these devices cannot operate normally. The l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567
CPCY02E60/12H01M10/0525H01M10/0567H01M10/0569H01M2300/0025H01M2300/0037Y02E60/10
Inventor 张建新路婷婷丁昭郡冯小钰姚斌
Owner SHANDONG UNIV
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