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Electrolyte and lithium ion battery containing electrolyte

An electrolyte and lithium salt technology, applied in the field of lithium-ion batteries, can solve the problems of cell cycle, rate, low temperature performance impact, difficult infiltration of pole pieces and separators, and high viscosity.

Active Publication Date: 2016-08-03
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its high viscosity, it is difficult to infiltrate the pole piece and diaphragm, especially under high compaction density, which has an adverse effect on the cycle, rate and low temperature performance of the cell.

Method used

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  • Electrolyte and lithium ion battery containing electrolyte
  • Electrolyte and lithium ion battery containing electrolyte
  • Electrolyte and lithium ion battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0143] In the following examples, comparative examples and experimental examples, the materials used are as follows:

[0144] Organic solvents: ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC); lithium salt: LiPF 6 ;

[0145] Additive A: Ester dimer:

[0146] Carbonate dimer: diethyl 2,5-dioxaadipate (AN1);

[0147]

[0148] Carboxylate dimer: diethylene glycol diacetate (AN2);

[0149]

[0150] Sultone dimer: 4-methylsulfonyloxy-butyl methanesulfonate (AN3);

[0151]

[0152] Additive B: Fluoroethers:

[0153] F(CF 2 ) 3 OCH 3 (AM1);

[0154] CF 3 CHFCF 2 CH 2 OCHF 2 (AM2);

[0155] H(CF 2 ) 2 CH 2 O(CF 2 ) 2 H(AM3);

[0156] Additive C:

[0157] Fluoroethylene carbonate (FEC);

[0158] Vinylene carbonate (VC);

[0159] 1,3-propane sultone (PS);

[0160] Adiponitrile (ADN);

[0161] Lithium battery separator: 16 micron thick polypropylene separator (model A273, provided by Celgard).

[0162] Lithium-ion batteries (he...

Embodiment 11～17

[0198] Electrolyte and lithium-ion battery were prepared according to the method of Example 1, the difference being that the composition of additives in the electrolyte was as shown in Table 4;

[0199] Table 4

[0200]

[0201]

[0202] The lithium-ion battery was prepared by using the electrolyte in Table 4, and the properties of the prepared battery were similar to those of Example 1, and will not be repeated due to space limitations.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery containing the electrolyte .The electrolyte comprises lithium salt, organic solvent and additives, wherein the additives include fluoro-ether and a dimerization ester compound, and the dimerization ester compound includes carbonic acid ester dimer, carboxylic acid ester dimer and sulfonated lactone dimer .The lithium ion battery containing the electrolyte can achieve the high-voltage purpose, the highest normal working voltage can be increased to 4.4-5.0 V, the cycle performance of the lithium ion battery is good, a higher capacity retention ratio is achieved during charging and discharging, and the service life of the lithium ion battery is prolonged.

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 including the electrolyte. Background technique [0002] In recent years, with the rapid development of smart electronic products, higher requirements have been placed on the battery life of lithium-ion batteries. In order to increase the energy density of lithium-ion batteries, developing high-voltage lithium-ion batteries is one of the effective methods. [0003] At present, lithium-ion batteries with an operating voltage above 4.4V have become a research hotspot for many scientific research institutes and enterprises. However, under high voltage, the oxidation activity of the positive electrode material increases and the stability decreases, which leads to the electrochemical oxidation reaction of the non-aqueous electrolyte on the surface of the positive electrode, and then decomposes to generate gas. At the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/052H01M2300/0025Y02E60/10H01M10/0566H01M10/0564
Inventor 王可飞
Owner NINGDE AMPEREX TECH
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