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Low-temperature electrolyte for LiFePO4 (lithium iron phosphate) lithium-ion batteries

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of lithium-ion transmission obstruction, lithium-ion battery failure, poor low-temperature performance, etc., to improve performance and improve low-temperature performance Features, the effect of fast transmission rate

Inactive Publication Date: 2013-03-20
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that the low-temperature electrolyte for lithium iron phosphate batteries in the prior art contains LiPF 6 , the hydrofluoric acid produced by it will lead to the failure of lithium-ion batteries and the obstruction of lithium-ion transmission, slow speed, low efficiency, and poor low-temperature performance. A low-temperature electrolyte for lithium iron phosphate lithium-ion batteries is provided. The low-temperature electrolyte Does not contain LiPF which generates hydrofluoric acid 6 At the same time, its performance can reach or even exceed that containing LiPF 6 Low temperature electrolyte for lithium iron phosphate lithium battery

Method used

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  • Low-temperature electrolyte for LiFePO4 (lithium iron phosphate) lithium-ion batteries

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Embodiment 1

[0024] A low-temperature electrolyte for a lithium iron phosphate lithium ion battery, comprising the following raw material components:

[0025] Dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethylene carbonate, film-forming additives, lithium polyoxometalates;

[0026] Described polyoxometalate lithium salt is lithium phosphomolybdate Li 3 PMo 12 o 40 , lithium phosphotungstate Li 3 PW 12 o 40 , lithium silicotungstate Li 4 SiW 12 o 40 or lithium molybdate silicate Li 4 SiMo 12 o 40 .

Embodiment 2

[0028] A low-temperature electrolyte for a lithium iron phosphate lithium ion battery, comprising the following raw material components:

[0029] 10% dimethyl carbonate, 20% diethyl carbonate, 55% ethyl methyl carbonate, 4% ethylene carbonate, 5% film-forming additive, 6% lithium polyoxometalate.

[0030] Described polyoxometalate lithium salt is lithium phosphomolybdate Li 3 PMo 12 o 40 , lithium phosphotungstate Li 3 PW 12 o 40 , lithium silicotungstate Li 4 SiW 12 o 40 or lithium molybdate silicate Li 4 SiMo 12 o 40 .

Embodiment 3

[0032] A low-temperature electrolyte for a lithium iron phosphate lithium ion battery, comprising the following raw material components:

[0033] 50% dimethyl carbonate, 5% diethyl carbonate, 10% ethyl methyl carbonate, 20% ethylene carbonate, 1% film-forming additive, 14% lithium polyoxometalate.

[0034] Described polyoxometalate lithium salt is lithium phosphomolybdate Li 3 PMo 12 o 40 , lithium phosphotungstate Li 3 PW 12 o 40 , lithium silicotungstate Li 4 SiW 12 o 40 or lithium molybdate silicate Li 4 SiMo 12 o 40 .

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Abstract

The invention relates to a low-temperature electrolyte for LiFePO4 (lithium iron phosphate) lithium-ion batteries, belonging to the technical field of low-temperature electrolytes for lithium batteries. The electrolyte comprises dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethylene carbonate, a film-forming additive and lithium polyoxometallate, wherein the lithium polyoxometallate refers to lithium phosphomolybdate Li3PMo12O40, lithium phosphotungstate Li3PW12O40, lithium silicotungstate Li4SiW12O40 or lithium silicomolybdenate Li4SiMo12O40. For solving the problems that in the prior art, the lithium ion transport of an electrolyte is blocked, slow in speed and low in efficiency and the electrolyte is poor in low-temperature performance, the invention provides a novel fluoride-free low-temperature electrolyte for LiFePO4 lithium-ion batteries; and by taking the non-fluoride lithium polyoxometallate with a three-dimensional skeleton structure as an electrolytic lithium salt and selectively adopting a low-viscosity carbonate solvent, through optimized proportioning, the migration rate of lithium ions is increased, and the low temperature properties of LiFePO4 batteries can be significantly improved.

Description

technical field [0001] The invention relates to an electrolyte solution for a battery, more specifically, the invention relates to a low-temperature electrolyte solution for a lithium iron phosphate lithium ion battery, and belongs to the technical field of low-temperature electrolyte solutions for lithium batteries. Background technique [0002] With the global energy shortage, environmental pollution and climate warming becoming more and more prominent, actively promoting the energy revolution, vigorously developing renewable energy, and accelerating the promotion and application of new energy have become new economic growth points and construction resource conservation in various countries and regions. A major strategic choice for a modern and environment-friendly society. Whether it is international capital or domestic enterprises, they are all aiming at the "giant cake" of the new energy industry. Therefore, electric vehicles, as the development trend of replacing fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0569H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 廖小东谢皎汤勇蒋正伟
Owner 中国东方电气集团有限公司
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