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Electrolytic solution for lithium ion battery, and lithium ion battery comprising electrolytic solution

An electrolyte and lithium salt technology, which can be used in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., and can solve problems such as battery performance degradation

Active Publication Date: 2020-12-29
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology

In order to solve these problems, the safety performance can be improved by adding flame retardants (such as trimethyl pho

Method used

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  • Electrolytic solution for lithium ion battery, and lithium ion battery comprising electrolytic solution
  • Electrolytic solution for lithium ion battery, and lithium ion battery comprising electrolytic solution

Examples

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Example

[0035] Comparative Examples 1-6 and Examples 1-9

[0036] The lithium-ion batteries of Comparative Examples 1-6 and Examples 1-9 were prepared according to the following preparation methods, and the only difference lies in the selection and addition of additives. The specific differences are shown in Table 1.

[0037] (1) Preparation of positive electrode sheet

[0038] The positive electrode active material LiCo 0.998 Al 0.001 Mg 0.0005 Ni 0.0005 o 2 , the binder polyvinylidene fluoride (PVDF), and the conductive agent acetylene black are mixed according to the weight ratio of 97:1.5:1.5, N-methylpyrrolidone (NMP) is added, and stirred under the action of a vacuum mixer until the mixed system becomes a uniform flow positive electrode slurry; apply the positive electrode slurry evenly on aluminum foil with a thickness of 9-12 μm; bake the above-mentioned coated aluminum foil in 5 ovens with different temperature gradients, and then put it in an oven at 120 ° C Dry for 8 ho...

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Abstract

The invention provides an electrolytic solution for a lithium ion battery, and the lithium ion battery comprising the electrolytic solution. The electrolytic solution comprises a non-aqueous organic solvent, an additive and a lithium salt, wherein the additive comprises 3-methyl-2-thioimidazoline-1-ethyl formate, tris(2-cyanoethyl)borate and tris(trimethylsilyl)phosphate. The lithium ion battery has high safety and good high and low temperature charge and discharge performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte suitable for high energy density lithium ion batteries and a lithium ion battery including the electrolyte. Background technique [0002] In recent years, lithium-ion batteries have been widely used in smartphones, tablet computers, smart wearables, power tools, and electric vehicles. With the wide application of lithium-ion batteries, the usage environment and demand of consumers for lithium-ion batteries continue to increase, which requires lithium-ion batteries to have the characteristics of both high and low temperature performance. However, there are potential safety hazards in the use of lithium-ion batteries. When the batteries are exposed to high-temperature thermal shock and other abuses, serious safety accidents, fires and even explosions are prone to occur. [0003] As an important part of lithium-ion batteries, electrolyte has...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 母英迪王龙王海李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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