Electrolyte and lithium ion battery comprising same

An electrolyte and lithium salt technology, applied in batteries, electrolytes, battery electrodes, etc., can solve the problems of poor cycle performance and storage performance, and achieve the effect of improving the first efficiency

Inactive Publication Date: 2015-11-25
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the high voltage system above 4.4V, it st

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

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0052] The preparation method of the lithium ion battery provided in the present application is well known in the art, and the lithium ion battery provided in the present application can be manufactured according to the existing lithium ion battery preparation method.

[0053] The lithium-ion battery provided by the application has the following beneficial technical effects due to containing the electrolyte provided by the application:

[0054] 1. Under the condition of high voltage above 4.4V, the first efficiency has been improved, so it can be seen that the lithium-ion battery has obtained a higher energy density;

[0055] 2. Under the condition of high voltage above 4.4V, the cycle performance is good, and the capacity retention rate is good under the charge / discharge condition;

[0056] 3. Under the condition of high voltage above 4.4V, the high-temperature storage performance is good, the change of thickness and internal resistance is small, and the remaining capacity an...

Embodiment 1～18

[0067] In Examples 1 to 18, the electrolyte solution 1 was sequentially prepared according to the following preparation method # ~18 # :

[0068] Add lithium salt into the organic solvent, then add PS, DTD, ADN, VC, FEC, mix well, and prepare electrolyte solution, wherein, the molar concentration of lithium salt in the electrolyte solution is 1mol / L.

[0069] In the above-mentioned Examples 1-18, the addition amounts of the various materials used are shown in Table 1 below, wherein the percentages in Table 1 are the weight percentages obtained by calculating the addition amounts of the materials based on the total weight of the electrolyte.

[0070] Table 1

[0071]

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PUM

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Abstract

The invention relates to an electrolyte and a lithium ion battery comprising the same. The electrolyte comprises an organic solvent, a lithium salt, vinylene carbonate, fluoroethylene carbonate and a combined additive, wherein the combined additive comprises the following raw materials by percentage: 0.1%-7% of propane sultone, 0.1%-7% of ethylene sulfate and 0.1%-9% of adiponitrile on the basis of total weight of the electrolyte. The electrolyte provided by the invention is applied to the lithium ion battery, so that the initial efficiency, the cycle performance, the high-temperature storage performance, the overcharge resistance performance and the safety performance of the lithium ion battery at high voltage of above 4.4V can be greatly improved.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular, to an electrolyte and a lithium-ion battery including the electrolyte. Background technique [0002] Lithium-ion batteries have significant characteristics such as high voltage, high capacity, and long life. More and more research is expanding the market for large-capacity lithium-ion batteries such as electric vehicles. In order to meet higher requirements, the research on positive and negative electrode materials and electrolytes of lithium-ion batteries is also being deepened. Among them, the research on the characteristics of the electrode / electrolyte interface has attracted much attention, for example, the solid electrolyte interface on the surface of the carbon negative electrode (solid electrolyte interface, referred to as SEI) film properties, its film formation mechanism and carbon material surface modification research. [0003] Research in recent years has...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2220/20H01M4/131H01M4/133H01M10/0568H01M10/0569H01M2300/004Y02E60/10H01M2300/0025
Inventor 王可飞韩昌隆付成华
Owner NINGDE AMPEREX TECH
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