A lithium ion battery wide temperature electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor cycle performance, solidification, and limited application of conductivity, so as to improve low-temperature performance and safety performance, reduce Viscosity, freezing point, and the effect of widening the temperature range

Inactive Publication Date: 2019-01-08
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature rises, on the one hand, the chain carbonate begins to volatilize or even decompose; on the other hand, the electrolyte and the electrode can react, causing a series of safety problems such as flatulence, and even an explosion
When the temperature is low, it is mainly affected by three aspects: first, as the temperature decreases, the viscosity of the cyclic carbonate increases or even solidifies, resulting in a decrease in ionic conductivity; second, the impedance of the SEI film increases, making charging and discharging The electrode polarization increases during the process; thirdly, lithium-ion batteries are prone to lithium precipitation in the later stages of charge and discharge

Method used

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  • A lithium ion battery wide temperature electrolyte
  • A lithium ion battery wide temperature electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Electrolyte preparation: two solvents, triethylene glycol dimethyl ether (TEGME) and tetraethylene glycol dimethyl ether (TEGDE), were weighed and mixed in a mass ratio of 9:11, and stirred to form an electrolyte solvent; Add moles of LiTFSI into the electrolyte solvent, stir until fully mixed to form a homogeneous phase, and obtain an ionic liquid; add 1.5 parts by mass ratio of EMC to the ionic liquid and continue stirring until uniformly mixed; finally add 1% of the total mass of the electrolyte to the electrolyte % LiFSI is used as a low-temperature additive, and after it is fully dissolved, it is left for 10 hours to prepare a wide-temperature electrolyte for lithium-ion batteries.

[0021] Preparation of the negative electrode sheet: weigh the negative electrode material lithium titanate, the binder PVDF and the conductive agent Ketjen Black according to the mass ratio of 8:1:1, dissolve in NMP, and stir to form a slurry with a certain viscosity. Coat the slurry o...

Embodiment 2

[0025] The two solvents of TEGME and TEGDE were weighed and mixed according to a mass ratio of 7:13, and then stirred to form an electrolyte solvent; then equimolar LiTFSI was added to the electrolyte solvent, and stirred until fully mixed to form a homogeneous phase to obtain an ionic liquid; Add 1.5 parts by mass ratio of EMC to the liquid and continue to stir until it is evenly mixed; finally, add 1% LiFSI of the total mass of the electrolyte to the electrolyte as a low-temperature additive. electrolyte.

[0026] Battery production and testing are the same as in Example 1

Embodiment 3

[0028] The two solvents of TEGME and TEGDE were weighed and mixed according to the mass ratio of 5:15, and the electrolyte solvent was formed after stirring; then equimolar LiTFSI was added to the electrolyte solvent, and stirred until fully mixed to form a homogeneous phase to obtain an ionic liquid; Add 1.5 parts by mass ratio of EMC to the liquid and continue to stir until it is evenly mixed; finally, add 1% LiFSI of the total mass of the electrolyte to the electrolyte as a low-temperature additive. electrolyte.

[0029] Battery production and testing are the same as in Example 1

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Abstract

The invention discloses a wide-temperature electrolyte for lithium ion battery, which is characterized in that the electrolyte is composed of an ionic liquid like ether solvent, an auxiliary organic solvent and a low-temperature additive. The electrolyte has low viscosity and freezing point and can maintain high ionic conductivity at ultra-low temperature. Forming a thin and dense solid electrolyte membrane on the surface of the negative electrode; On the premise of maintaining good cycling performance at room temperature, the charge-discharge capability at low temperature and safety performance at high temperature are effectively improved, and the application range of lithium battery is effectively expanded.

Description

technical field [0001] The invention relates to a lithium-ion battery wide-temperature electrolyte, which belongs to the technical field of lithium-ion batteries. Background technique [0002] Since the commercial use of lithium-ion batteries in the 1990s, they have developed rapidly due to their advantages such as high specific energy, long cycle life, small size, and environmental friendliness. Today, lithium-ion batteries have been widely used in all aspects of our lives. They have not only become part of electronic products such as mobile phones, computers, and digital cameras, but also appear as a new energy source in the automotive, military, and aerospace fields. In the field of pure electric vehicles (EV) and hybrid electric vehicles (HEV), the temperature requirement for lithium-ion batteries is that they can be stored at a low temperature of -20°C and can be discharged at a low rate; stable operation in the environment. Therefore, it is particularly important to ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCH01M10/0567Y02E60/10
Inventor 张锁江张兰郭亚伟贾梦敏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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