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Electrolyte and lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of increasing the interface impedance of the positive and negative electrodes, the charge-discharge rate performance of lithium-ion secondary batteries, the deterioration of low-temperature discharge performance, and the deterioration of high-temperature performance, etc.

Active Publication Date: 2021-03-09
ENVISION RUITAI DYNAMICS TECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the normal environment, the performance of general lithium-ion batteries will deteriorate significantly when used in extreme conditions.
[0003] As an important part of lithium-ion batteries, the electrolyte has a significant impact on the high-temperature performance and low-temperature performance of lithium-ion batteries. However, in general, there is a contradiction in improving the high-temperature performance and low-temperature performance of lithium-ion batteries from the perspective of electrolyte.
Taking lithium-ion secondary batteries as an example, on the one hand, the high-temperature performance can be improved by adding film-forming additives to passivate the interface between positive and negative electrodes. and low temperature discharge performance deteriorated severely
On the other hand, by optimizing the organic solvent composition of the electrolyte (such as adding a large amount of low-viscosity organic solvent), the viscosity of the electrolyte at low temperatures is reduced and the conductivity is increased, which can improve the charge-discharge rate performance and performance of the lithium-ion secondary battery. Low-temperature discharge performance, but high-temperature performance usually deteriorates, which cannot finally solve the problem of lithium-ion secondary batteries in applications

Method used

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  • Electrolyte and lithium-ion battery
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  • Electrolyte and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides an electrolyte and a lithium-ion secondary battery containing the electrolyte, and the specific preparation method is as follows:

[0053] (1) Preparation of electrolyte:

[0054] In a glove box full of argon (moisture content<10ppm, oxygen content<1ppm), ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) are EC:DEC by mass ratio: EMC = 3:2:5 for mixing to form a non-aqueous organic solvent.

[0055] Add dry lithium salt and additives into the mixed solution to dissolve, specifically add the additives first, then slowly add the lithium salt, stir until completely dissolved, and obtain an electrolyte.

[0056] The lithium salt used in the present embodiment is LiPF 6 and LiFSI, LiPF 6 The mass fraction of LiFSI is 12.5%, and the mass fraction of LiFSI is 0.5%; The additive used in the present embodiment is tri-tert-butyl borate, vinylene carbonate (VC), 1,3-propane sultone and Vinylene sulfate (DTD), the mass fr...

Embodiment 2～6

[0064] Each embodiment provides an electrolyte and a lithium-ion secondary battery containing the electrolyte. The specific preparation method is roughly the same as that of Example 1, except that the lithium salts and additives selected for the electrolyte of each embodiment are and contents are shown in Table 1.

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Abstract

Embodiments of the present application provide an electrolyte and a lithium-ion battery, which relate to the technical field of lithium-ion batteries. The electrolyte solution includes an organic solvent and additives dissolved in the organic solvent, the additives include tri-tert-butyl borate, vinylene carbonate and 1,3-propane sultone. The electrolyte can make the lithium ion battery have both good high temperature performance and low temperature performance, especially after the electrolyte is applied to the lithium ion secondary battery, the lithium ion secondary battery can have good high temperature storage performance and high temperature cycle at the same time. performance and low low temperature DC resistance.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular, to an electrolyte and a lithium-ion battery. Background technique [0002] At present, the issues that people are most concerned about new energy vehicles include: the battery life, price and safety of new energy vehicles. Among them, power battery is one of the core technologies of new energy vehicles. Lithium-ion battery has become the first choice of power battery due to its advantages of high energy density, high working voltage and long service life. With the widespread application of lithium-ion batteries, higher requirements are put forward for their environmental adaptability. The current power batteries sometimes need to be used under extreme conditions, such as high or low temperature environments. However, compared with the normal environment, the performance of general lithium-ion batteries will deteriorate significantly when used in extreme con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 陈石穿赵卫军林玉春陶亮其他发明人请求不公开姓名
Owner ENVISION RUITAI DYNAMICS TECH (SHANGHAI) CO LTD