Unlock instant, AI-driven research and patent intelligence for your innovation.

Low temperature lithium ion battery electrolyte and its preparation method

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor low temperature performance, achieve high thermal stability, low viscosity and melting point, discharge platform and discharge capacity improvement effect

Active Publication Date: 2015-05-13
中创新航科技(江苏)有限公司
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of poor low-temperature performance of the current lithium-ion battery electrolyte, the purpose of the present invention is to provide a lithium-ion battery low-temperature electrolyte and a preparation method thereof

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low temperature lithium ion battery electrolyte and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In a glove box filled with argon (moisture <10ppm), respectively according to EC: DMC: PC: MA=4:4:1:1 (wt%) to weigh each high-purity organic solvent, accounting for 85% of the total weight, stirring for 15 minutes, add the additive fluorocarbonic acid Vinyl ester (FEC), accounting for 5% of the total weight, continue to stir for 5 minutes; then add the mixed lithium salt (LBBB and LBSB) to the above mixed solution, the molar ratio of LBBB to LBSB is 80:20, accounting for 10 %, and then stir for 15 minutes to obtain low-temperature electrolyte for lithium-ion batteries.

Embodiment 2

[0018] In a glove box filled with argon (moisture <10ppm), respectively according to EC: DMC: PC: MA=4:4:1:1 (wt%) to weigh each high-purity organic solvent, accounting for 83% of the total weight, stirring for 20 minutes, add the additive fluorocarbonic acid Vinyl ester (FEC), accounting for 4% of the total weight, continue to stir for 10 minutes; then add the mixed lithium salt (LBBB and LBSB) to the above mixed solution, the molar ratio of LBBB to LBSB is 75:25, accounting for 13 %, and stir for another 20 minutes to obtain low-temperature electrolyte for lithium-ion batteries.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to View More

Abstract

The invention discloses a low temperature lithium ion battery electrolyte and its preparation method. The electrolyte contains the following components expressed in weight percentage: 10 to 15% of electrolyte salts, 80 to 89% of a non-aqueous organic solvent and 0.5 to 10% of an additive. The electrolyte salts are bis-o-dihydroxybenzene-lithium borate (LBBB) and di-salicylic acid-lithium borate (LBSB); the non-aqueous organic solvent is a four-element organic mixed solvent consisting of ethylene carbonate, dimethyl carbonate, propylene carbonate and methyl acetate. The preparation method for the electrolyte in the invention comprises the following steps: uniformly mixing organic solvents in proportion in a glove box filled with argon; adding the additive and finally adding the mixed electrolyte salts; and carrying out uniform mixing. Compared to traditional electrolytes, the low temperature electrolyte prepared in the invention has improved ionic conductivity and broadens a low temperature application scope of a battery, and a lithium ion battery containing the electrolyte has improved discharge voltage plateau and discharge capacity at a low temperature.

Description

Technical field [0001] The invention relates to the technical field of lithium ion battery electrolyte, in particular to a lithium ion battery low-temperature electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of green and environmentally friendly batteries developed in the 1990s. They have the characteristics of high voltage, large specific energy, long charge and discharge life, safety and environmental protection, and become the first choice for portable power supplies and power batteries. In some aviation, aerospace and military fields, the harsh requirements for lithium-ion batteries are mainly reflected in low-temperature performance, cycle performance and safety, and the composition of the electrolyte is one of the key factors that determine these properties. Lithium-ion batteries use two different compounds that can reversibly enter / exit lithium ions as positive and negative electrode materials. Currentl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0566H01M10/0568H01M10/0569
CPCY02E60/10
Inventor 郭建峰吕岩樊彦良周志勇宫娇娇王闰东
Owner 中创新航科技(江苏)有限公司