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High-low-temperature electrolyte suitable for lithium iron phosphate power battery and preparation method for electrolyte

A power battery and lithium iron phosphate technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, organic electrolytes, etc., can solve problems such as capacity fading and affecting battery cycle performance, and achieve the effect of meeting performance requirements

Inactive Publication Date: 2017-08-18
BEIJING WANYUAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At high temperature, LiFePO 4 Cathode material and LiPF 6 The oxidation reaction of the electrolyte causes the precipitation of Fe ions, the SEI film formed by the negative electrode is dissolved and destroyed, and the aluminum foil of the positive electrode current collector is corroded by the HF generated by the reaction of the electrolyte and water, all of which lead to LiFePO 4 As the temperature rises, the capacity of the power battery decays rapidly, which affects the cycle performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use EC, PC, EMC, DMC, DEC Molecular sieves were used to remove water for 24 hours, and then an organic solvent was prepared according to the volume ratio of 1:1:2:1:1; in a glove box filled with argon, at -3 ° C, the LiPF 6 Slowly dissolve in an organic solvent to prepare a lithium salt solution with a concentration of 1M. Add 1% of VC, 3% of FEC and 5% of LiBOB in organic solvent mass to the prepared lithium salt solution to prepare an electrolyte.

[0022] LiFePO 4 As the positive electrode material, artificial graphite is used as the negative electrode material, Celgard commercial diaphragm is used, and the prepared high and low temperature electrolyte is added to prepare 18Ah LiFePO 4 / graphite full battery.

[0023] At -20°C, the discharge capacity of the battery at 1C rate is 63% of the discharge capacity at room temperature at the same rate. At a high temperature of 60°C, after 200 cycles of charging and discharging at a 3C rate, the battery capacity retent...

Embodiment 2

[0025] Use EC, PC, DMC, DEC and EMC with Molecular sieve removes water for 24 hours, and then prepares an organic solvent according to the volume ratio of 2:2:2:1:1; at 0°C, the LiPF 6 Slowly dissolve in an organic solvent to prepare a lithium salt solution with a concentration of 1.2M. Add 1% of VC, 3% of FEC and 5% of LiBOB in organic solvent mass to the prepared lithium salt solution to prepare an electrolyte.

Embodiment 3

[0027] Use EC, PC, DMC, DEC and EMC with Molecular sieves remove impurities and remove water, and then prepare organic solvents according to the volume ratio of 2:1:2:1:1. At -5°C, the LiPF 6 Slowly dissolve in an organic solvent to prepare a lithium salt solution with a concentration of 1.3M. Add 0.1% of VC, 0.1% of FEC and 3% of LiBOB as an organic solvent to the prepared lithium salt solution to prepare an electrolyte.

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Abstract

The invention belongs to the field of an electrolyte of a lithium ion battery, and relates to a high-low-temperature electrolyte suitable for a lithium iron phosphate power battery and a preparation method for the electrolyte. The electrolyte is prepared from a lithium salt, an organic solvent and additives. By virtue of the high-low-temperature electrolyte suitable for the lithium iron phosphate power battery and the preparation method for the electrolyte, the problems of poor high-temperature cycling performance and low low-temperature discharging capacity of the lithium iron phosphate power battery can be solved, and performance requirements of the lithium iron phosphate power battery in high-low-temperature environments can be satisfied.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrolytes, and relates to a high-low temperature electrolyte suitable for lithium iron phosphate power batteries and a preparation method thereof. Background technique [0002] Lithium-ion power batteries have the advantages of high voltage, high specific energy, long service life, good safety, and environmental protection, and have become the mainstream of power sources. The application of lithium-ion power batteries in electric vehicles and aerospace energy storage equipment requires good high and low temperature performance, that is, high temperature cycle performance and low temperature discharge performance. [0003] However, currently commonly used lithium iron phosphate (LiFePO 4 ) The high and low temperature performance of the power battery needs to be improved urgently. The low temperature performance of lithium iron phosphate power battery is poor, on the one hand because LiFePO ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/058H01M10/42
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/058H01M10/4235H01M2300/0025Y02E60/10Y02P70/50
Inventor 李光珠安永昕
Owner BEIJING WANYUAN IND
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