Electrolyte for improving low temperature performance of lithium ion battery and lithium ion battery comprising same

A lithium-ion battery, low-temperature performance technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of abnormal use of products, increased electrolyte viscosity, low charge and discharge capacity, etc., to improve reversible capacity performance, Effect of reducing concentration polarization and reducing interfacial impedance

Active Publication Date: 2019-06-07
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion batteries with conventional electrolyte systems are under low temperature conditions, the viscosity of the electrolyte increases and the conductivity decrea

Method used

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  • Electrolyte for improving low temperature performance of lithium ion battery and lithium ion battery comprising same
  • Electrolyte for improving low temperature performance of lithium ion battery and lithium ion battery comprising same
  • Electrolyte for improving low temperature performance of lithium ion battery and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 1

[0049] Electrolyte preparation: In a glove box filled with argon, the mass ratio of ethylene carbonate, dimethyl carbonate, propylene carbonate and methyl acetate is EC: DMC: PC: MA = 3:3:3:2 After mixing, slowly add 12.5wt% of lithium hexafluorophosphate based on the total weight of the electrolyte, 0.5wt% of lithium bisfluorosulfonimide (LiTFSI) based on the total weight of the electrolyte, and 2.5wt% of the total weight of the electrolyte to the mixed solution. Lithium bisfluorosulfonimide (LiFSI), based on the total weight of the electrolyte, 11.0wt% of the compound with the structure shown in formula I, 0.1wt% of the cyclic anhydride compound shown in formula II, and 2.0wt% of sulfuric acid Vinyl ester (DTD) and 1.0 wt% fluoroethylene carbonate (FEC) were stirred uniformly to obtain the lithium ion battery electrolyte of Example 1.

[0050] Preparation of soft-pack battery: stack the prepared positive sheet, separator, and negative sheet in order, so that t...

Example Embodiment

[0052] Example 2-9 and Comparative Example 1-6

[0053] In Examples 2-9 and Comparative Examples 1-6, except that the composition ratio of each component of the electrolyte is added as shown in Table 2, the others are the same as in Example 1.

[0054] Table 2 The composition ratio of each component of the electrolyte of Examples 1-9 and Comparative Examples 1-6

[0055]

[0056]

[0057] Performance Testing

[0058] Related performance tests were performed on the batteries and their electrolytes prepared in Examples 1-9 and Comparative Examples 1-6.

[0059] (1) Electrolyte conductivity and viscosity test: use a conductivity meter and a viscosity tester to measure the ionic conductivity and viscosity of the electrolyte at different temperatures.

[0060] (2) Capacity remaining rate test after high temperature storage at 45℃: First, put the battery at room temperature and charge and discharge 1 time at 0.5C (4.2V~3.0V), and record the discharge capacity C before storage. 0 , Then charge ...

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Abstract

The invention discloses an electrolyte for improving the low temperature performance of a lithium ion battery and a lithium ion battery comprising the same. The electrolyte comprises conductive lithium salt, a non-aqueous organic solvent, and additives, wherein the additives include a conventional negative electrode film forming additive, an additive with the structure of Formula I, and an anhydride-type compound additive with the structure of Formula II. According to the battery electrolyte provided by the invention, under synergistic effects among the additive with the structure of Formula I, the anhydride-type compound additive with the structure of Formula II, a nitrogen-containing lithium salt type additive and the conventional negative electrode film forming additive, the electrolytethus has excellent film forming performance on the electrode surface, the cycle performance and the rate performance of the lithium ion battery in a low temperature condition can be effectively improved, and the high temperature cycle performance and the storage performance of the battery are little affected.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrolyte solution for improving the low-temperature performance of the lithium ion battery and a lithium ion battery containing the electrolyte solution. Background technique [0002] The rapid development of electronic information technology and consumer electronics poses new challenges to the performance requirements of batteries, especially the low-temperature discharge performance of batteries. Key technical difficulties encountered. Therefore, developing a battery with low temperature resistance has become a major challenge and research hotspot in the field of lithium-ion batteries. [0003] At present, the performance of the low-temperature electrolyte of lithium-ion batteries is mainly limited by three aspects: first, the viscosity of the commonly used EC-based electrolyte increases or even solidifies at low temperature, which makes the ionic conductivity of the...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/10
Inventor 张丽娟大浦靖郭力刘津宏朱学全
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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