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Electrolytic solution and lithium-ion battery employing same

An electrolyte and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as excessive charging current or discharging current, equipment and human injury, etc.

Active Publication Date: 2016-09-21
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of the battery, a large amount of heat is often generated due to excessive charging current or discharging current, causing certain damage to equipment and human body

Method used

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  • Electrolytic solution and lithium-ion battery employing same
  • Electrolytic solution and lithium-ion battery employing same
  • Electrolytic solution and lithium-ion battery employing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Electrolyte solutions 1-16 were prepared according to the following method:

[0108] In the dry room, after EC and DEC are mixed, add electrolyte, then add cyclic lactone compound and additive, mix uniformly, obtain electrolyte, wherein, the addition amount of EC and DEC is such that EC and DEC weight ratio is EC: DEC=3:7, the amount of electrolyte added is such that LiPF 6 The molar concentration in the electrolyte is 1mol / L.

[0109] Preparation method of lithium ion battery:

[0110] Stack the positive electrode sheet, lithium battery separator, and negative electrode sheet in order, so that the lithium battery separator film is between the positive and negative electrode sheets to play the role of isolation, and then wind the bare cell; put the bare cell in the outer packaging Inject the above-mentioned prepared electrolyte into the dried battery, and go through processes such as vacuum packaging, standing, forming, and shaping to obtain the battery.

[0111] In ...

Embodiment 2

[0132] The electrolyte solution of this example was prepared according to the method of Example 1, the only difference being that the composition and amount of additives in the electrolyte solution are shown in Table 3.

[0133] table 3:

[0134]

[0135]

[0136] Prepare the lithium-ion battery with the electrolyte of this example according to the method in Example 1, and test the performance of the battery according to the method in Example 1. The performance of batteries 17-33 is similar to that of the above examples, and the space is limited. Let me repeat.

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Abstract

The invention belongs to the field of lithium-ion batteries, and particularly relates to an electrolytic solution and a lithium-ion battery employing the same. The electrolytic solution comprises an organic solvent, an electrolyte and additives, wherein the additives include the additive A and the additive B; the additive A is selected from at least one of a sulfoxide compound, a sulfone compound, a sulphite compound, a sulphate compound and methylene methanedisulfonate; the additive B is selected from lithium difluorophosphate or at least one of the compounds as shown in a formula I. According to the electrolyte solution, DC impedance of the fresh lithium-ion battery and the DC impedance of a cycled battery can be reduced. The formula I is as shown in the specification.

Description

technical field [0001] The present application belongs to the field of lithium ion batteries, in particular, the application relates to an electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics products, energy storage and power batteries due to their advantages such as high specific energy, long cycle life, and small self-discharge. With the widespread application of lithium-ion batteries, their use environments have long tended to be diverse, and the requirements for batteries are getting higher and higher. During the use of the battery, a large amount of heat is often generated due to excessive charging current or discharging current, causing certain damage to equipment and human body. [0003] The calorific value of the battery per unit time is not only affected by the closed circuit current, but also related to the DC internal resistance of the battery. The larger the DC i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2220/20H01M2220/30H01M2300/0025Y02E60/10
Inventor 龙兵王小梅李永坤王升威唐兴宇孙庆娜
Owner CONTEMPORARY AMPEREX TECH CO
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