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High voltage lithium ion battery and its electrolyte

A lithium-ion battery, high-voltage technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problem of SEI film rupture or gradual dissolution, increase the internal pressure of lithium-ion batteries, and reduce the cycle performance of lithium-ion batteries To achieve the effects of inhibiting oxidation and decomposition to produce gas, improving cycle performance at room temperature, and improving the interface

Active Publication Date: 2018-12-04
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the charge and discharge progress, the negative electrode active material will repeatedly expand and contract, causing the SEI film to rupture or gradually dissolve, and the exposed negative electrode sheet continues to react with the electrolyte to form a new SEI film, and With the generation of a large number of by-products, gas is generated at the same time, increasing the internal pressure of lithium-ion batteries and greatly reducing the cycle performance of lithium-ion batteries

Method used

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  • High voltage lithium ion battery and its electrolyte

Examples

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Effect test

Embodiment 1

[0068] Lithium-ion batteries were prepared according to the method of Comparative Example 1, except for the following differences:

[0069] (1) prepare the electrolytic solution of lithium-ion battery: additive is that the mass percent composition in electrolytic solution is 4% fluoroethylene carbonate (FEC), the mass percent composition in electrolytic solution is 0.5% three ( trimethylsilane) borate (TMSB) and 1% ethylene glycol bis(propionitrile) ether in mass percent in the electrolyte.

Embodiment 2

[0071] Lithium-ion batteries were prepared according to the method of Comparative Example 1, except for the following differences:

[0072] (1) prepare the electrolytic solution of lithium-ion battery: the additive is that the mass percent composition in electrolytic solution is 0.5% fluoroethylene carbonate (FEC), the mass percent composition in electrolytic solution is 0.5% three ( trimethylsilane) borate (TMSB) and 1% ethylene glycol bis(propionitrile) ether in mass percent in the electrolyte.

Embodiment 3

[0074] Lithium-ion batteries were prepared according to the method of Comparative Example 1, except for the following differences:

[0075] (1) prepare the electrolytic solution of lithium-ion battery: additive is that the mass percent composition in electrolytic solution is 2% fluoroethylene carbonate (FEC), the mass percent composition in electrolytic solution is 0.5% three ( trimethylsilane) borate (TMSB) and 1% ethylene glycol bis(propionitrile) ether in mass percent in the electrolyte.

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Abstract

The present invention provides a high voltage lithium ion battery and an electrolyte thereof. The electrolyte of the high voltage lithium ion battery comprises a lithium salt, a non-aqueous organic solvent, and an additive, wherein the additive contains a conventional negative electrode film forming additive, tris(trimethylsilyl) borate (TMSB), and a dicyano ether compound having a structure represented by a formula I, n is an integer of 1-4, the conventional negative electrode film forming additive comprises fluoroethylene carbonate (FEC), and the high voltage lithium ion battery comprises the electrolyte of the high voltage lithium ion battery. The high voltage lithium ion battery of the present invention has advantages of excellent normal temperature cycle performance, excellent high temperature cycle performance, excellent high temperature storage performance, and excellent low temperature discharge performance. The formula I is defined in the specification.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage lithium-ion battery and its electrolyte. Background technique [0002] The high energy density, long cycle life, wide operating temperature range, and environmental protection of lithium-ion batteries have made them the main energy source for mobile electronic devices. However, the rapid development of mobile electronic devices, especially smartphones (lighter and thinner) in recent years, has put forward higher requirements for the energy density of lithium-ion batteries. In addition, current electronic products sometimes need to be used under extreme conditions (such as high or low temperature environments). Compared with conventional environments, the performance of lithium-ion batteries will deteriorate significantly when used under extreme conditions. [0003] In order to increase the energy density of lithium-ion batteries, a common measure is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 张明
Owner CONTEMPORARY AMPEREX TECH CO
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