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Low-temperature electrolyte for improving low-temperature performance of lithium iron phosphate-graphite battery

A lithium iron phosphate and electrolyte technology, which is applied in the field of low temperature electrolyte to improve the low temperature performance of lithium iron phosphate-graphite batteries, can solve the problems affecting the conductivity, capacity retention rate and cycle life electrochemical performance of lithium batteries, etc., to avoid Reduction in capacity retention, avoidance of shortening of cycle life, high ionic conductivity

Pending Publication Date: 2022-02-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the ambient temperature decreases again and again, it is not once and for all to use low melting point solvents as electrolyte solvents. The viscosity, ionic conductivity and dielectric constant of solvents at low temperatures all affect the conductivity, capacity retention and cycle life of lithium batteries. Isoelectrochemical properties

Method used

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  • Low-temperature electrolyte for improving low-temperature performance of lithium iron phosphate-graphite battery
  • Low-temperature electrolyte for improving low-temperature performance of lithium iron phosphate-graphite battery
  • Low-temperature electrolyte for improving low-temperature performance of lithium iron phosphate-graphite battery

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Embodiment 1

[0018] In a glove box filled with argon (oxygen content ≤ 5ppm, water content ≤ 10ppm), the organic solvents ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) ) according to the volume ratio of 25:5:45:25 and mix evenly and keep stirring, the non-aqueous solvent accounts for 82% of the total mass of the electrolyte. Lithium hexafluorophosphate (LiPF 6 ) and fully stirred to dissolve so that its content is 15% of the total mass of the electrolyte. After the mixed solution returns to room temperature, add vinylene carbonate (VC), fluoroethylene carbonate (FEC) and polydimethylsiloxane derivatives respectively accounting for 1% of the total mass of the electrolyte in sequence, stir well and mix evenly .

[0019] The structure of polydimethylsiloxane derivatives is as follows:

[0020]

[0021] The preparation steps of the battery: inject an appropriate amount of the prepared electrolyte solution into a pouch battery wi...

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Abstract

The invention discloses a low-temperature electrolyte for improving the low-temperature performance of a lithium iron phosphate-graphite battery. The low-temperature electrolyte comprises the following raw materials of: a non-aqueous solvent, a lithium salt, a low-temperature additive and other functional additives, wherein the low-temperature additive is a polydimethylsiloxane derivative. According to the low-temperature electrolyte and the preparation method thereof, the low-temperature additive polydimethylsiloxane is structurally modified, so that the prepared low-temperature electrolyte has good low-temperature performance, the conductivity and the capacity retention ratio of the lithium iron phosphate-graphite battery in a low-temperature environment are improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a low-temperature electrolyte for improving the low-temperature performance of lithium iron phosphate-graphite batteries. Background technique [0002] Due to its advantages of high energy density, high working voltage, good reliability, and low cost, lithium iron phosphate-graphite battery has received great attention in academia, and has made great progress in the industry. It is widely used in small electronic products, electric Automobiles, large-scale energy storage and other fields. my country has a vast territory with a large span from north to south, and the climate temperature can be as low as minus 50 degrees. However, some studies have pointed out that traditional lithium iron phosphate-graphite batteries lose most of their energy and capacity below minus 10 degrees. Therefore, improving low-temperature performance is necessary and urgent for the application...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/0567H01M10/052H01M2300/0091Y02E60/10
Inventor 梁伟路王鹏梁大宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY