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Electrolyte and lithium ion battery comprising same

An electrolyte and lithium salt technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of deterioration reaction of positive electrode active materials, affecting the performance of lithium ion batteries, etc., to improve cycle performance, improve storage performance, The effect of improved storage performance

Active Publication Date: 2016-07-20
JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, under the high voltage of 4.6V, the conventional electrolyte will be oxidized and decomposed on the surface of the positive electrode of the battery. The oxidative decomposition of the electrolyte itself will also promote the deterioration of the positive active material, which will further affect the performance of the lithium-ion battery, such as storage. performance and cycle performance

Method used

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  • Electrolyte and lithium ion battery comprising same
  • Electrolyte and lithium ion battery comprising same
  • Electrolyte and lithium ion battery comprising same

Examples

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Embodiment 1

[0071] The present application is further described below through specific examples. However, these examples are merely exemplary and do not constitute any limitation to the protection scope of the present application.

[0072] In the following examples, comparative examples and test examples, the reagents, materials and instruments used are conventional reagents, conventional materials and conventional instruments unless otherwise specified, and are commercially available, and the reagents involved are also available commercially. It can be synthesized by conventional synthetic methods.

[0073] In the following examples, comparative examples and test examples, the reagents used are as follows:

[0074] additive:

[0075] Hydrothiophene-boron trifluoride coordination compounds: compound 1~compound 3;

[0076]

[0077] Lithium fluorophosphate: lithium difluorophosphate mentioned above.

[0078] Lithium salt: lithium hexafluorophosphate (LiPF 6 ).

[0079] Organic solv...

Embodiment 2

[0140] The electrolyte was prepared according to the method of Example 1, the difference being that the structural formula and content of the additives hydrogenated thiophene-boron trifluoride coordination compound and lithium fluorophosphate are shown in Table 4:

[0141] In Table 4 below, the contents of hydrogenated thiophene-boron trifluoride complex and lithium fluorophosphate are weight percents calculated based on the total weight of the electrolytic solution.

[0142] Table 4

[0143]

[0144]

[0145]

[0146]

[0147] The prepared electrolytes 29-44 were used to prepare lithium ion batteries according to the method in the above examples. The 60°C storage performance test results and cycle performance of the prepared lithium ion batteries were similar to those in the above examples.

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Abstract

The invention relates to the field of batteries and particularly relates to an electrolyte and a lithium ion battery comprising the same. The electrolyte comprises an organic solvent, lithium salt and additives, wherein the additives include thiophene hydride-boron trifluoride coordination compound and lithium fluorophosphate. According to the electrolyte provided by the invention, under the joint synergistic effect between the thiophene hydride-boron trifluoride coordination compound and the lithium fluorophosphate, an SEI film capable of inhibiting electrolyte decomposition is formed on the surfaces of the positive and negative plates of the lithium ion battery respectively, and acidic materials generated in the electrolyte also can be neutralized, thereby greatly improving the cycle performance and storage performance of the lithium ion battery.

Description

technical field [0001] The present application relates to the field of batteries, in particular to an electrolyte and a lithium ion battery comprising the electrolyte. Background technique [0002] At present, the positive electrode active materials used in lithium-ion batteries mainly include lithium manganate, lithium cobaltate, ternary materials, lithium iron phosphate, etc. Under normal circumstances, the lithium-ion battery with the above-mentioned positive electrode materials The charging cut-off voltage of the lithium-ion battery does not exceed 4.2V, but with the advancement of technology and the continuous development of the market, it is increasingly important and urgent to increase the energy density of lithium-ion batteries. An effective way to increase the energy density of lithium-ion batteries is to develop high-voltage Lithium Ion Battery. [0003] However, under the high voltage of 4.6V, the conventional electrolyte will be oxidized and decomposed on the su...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 史松君谢岚王耀辉王珂
Owner JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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