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Electrolyte and lithium-ion battery comprising same

An electrolyte and lithium salt technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of electrolyte consumption, lithium analysis, and battery capacity reduction

Inactive Publication Date: 2016-07-06
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the formed SEI film is too thick and the film resistance is high, lithium ions cannot migrate through, and lithium precipitation will occur; during the cycle, if the formed SEI film is not dense and stable, the SEI film will gradually dissolve or rupture, resulting in The exposed negative electrode continues to react with the electrolyte, which consumes the electrolyte and reduces the battery capacity

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

Embodiment 1～19

[0089] Preparation of Examples 1-19 lithium-ion batteries (hereinafter referred to as batteries) 1-19

[0090] Batteries 1-19 were prepared according to the following method:

[0091] (1) Negative plate preparation

[0092] Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber, thickener sodium carboxymethylcellulose are graphite in weight ratio: acetylene black: styrene-butadiene rubber: sodium carboxymethylcellulose=95:2 : 2:1 for mixing, after adding deionized water, fully stir and mix to form a uniform negative electrode slurry; apply this slurry on the copper foil of the negative electrode current collector, then dry and cold press to obtain the negative electrode sheet.

[0093] (2) Preparation of positive electrode sheet

[0094] The positive electrode active material lithium nickel manganese cobalt ternary material, conductive agent acetylene black, and binder polyvinylidene fluoride are lithium nickel manganes...

Embodiment 20～33

[0148] Electrolyte and lithium-ion battery were prepared according to the method of Example 1, the only difference being that the composition of additives in the electrolyte was as shown in Table 4:

[0149] Table 4:

[0150]

[0151]

[0152] The storage performance, normal-temperature cycle performance and high-temperature cycle performance of the lithium-ion batteries prepared in Examples 20-33 are similar to those of the above-mentioned examples, and will not be repeated here due to space limitations.

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Abstract

The invention relates to the field of lithium batteries, in particular to an electrolyte and a lithium-ion battery comprising the same. The electrolyte comprises an organic solvent, a lithium salt and an additive, wherein the additive comprises an acyl ketone lithium compound and a fluoro lithium phosphate compound. When the electrolyte simultaneously comprises the acyl ketone lithium compound and the fluoro lithium phosphate compound, the cycle performance of the lithium-ion battery can be improved; and meanwhile, the storage property of the electrolyte is also obviously improved.

Description

technical field [0001] The present application relates to the field of lithium batteries, in particular, to an electrolyte and a lithium ion battery including the electrolyte. Background technique [0002] In recent years, portable battery products, such as cameras, digital video cameras, mobile phones, notebook computers, etc., have been widely used in people's daily life. Reducing size, reducing weight, and prolonging service life are the development trends and requirements of the battery product industry. Therefore, it is an urgent requirement for the development of the industry to develop power supply products that are compatible with portable electronic products, especially the development of lightweight secondary batteries that can provide high energy density. [0003] During the first charging process of lithium-ion batteries, a layer of SEI film will be formed on the surface of the negative electrode. If the formed SEI film is too thick and the film resistance is h...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 冯绍伟韩昌隆付成华
Owner CONTEMPORARY AMPEREX TECH CO
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