Non-aqueous electrolyte and secondary battery

A non-aqueous electrolyte, non-aqueous technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve problems such as growth, high-temperature gas production resistance, etc.

Pending Publication Date: 2022-07-08
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing lithium-ion batteries have the problems of high-temperature gas production and impedance growth. The invention provides a non-aqueous electrolyte and a secondary battery

Method used

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  • Non-aqueous electrolyte and secondary battery
  • Non-aqueous electrolyte and secondary battery
  • Non-aqueous electrolyte and secondary battery

Examples

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Embodiment 1

[0116] This embodiment is used to illustrate the lithium ion battery disclosed in the present invention and the preparation method thereof, including the following operation steps:

[0117] 1) Preparation of electrolyte

[0118] Ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC) were mixed, and then lithium hexafluorophosphate (LiPF) was added. 6 ) to a mass concentration of 14.4%, add additives. The selection, content, cyclic carbonate content, electrical conductivity and total alcohol mass percentage content of additives in the non-aqueous electrolyte are shown in Table 2.

[0119] 2) Preparation of positive plate

[0120] The cathode active material LiNi is mixed in a mass ratio of 97:1.5:1.5 0.8 Co 0.1 Mn 0.1 O 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The slurry is evenly coated on both sides of the alumin...

Embodiment 2～33

[0129] Examples 2 to 33 are used to illustrate the lithium ion battery disclosed in the present invention and the preparation method thereof, including most of the operation steps in Example 1, and the differences are:

[0130] The selection, content, cyclic carbonate content, electrical conductivity and total alcohol mass percentage of the additives shown in Table 1 were used.

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Abstract

In order to overcome the problems of high-temperature gas production and impedance increase of a lithium ion battery, the invention provides a non-aqueous electrolyte which comprises a non-aqueous organic solvent, an electrolyte salt and an additive, the non-aqueous organic solvent comprises cyclic carbonate, and the mass percentage content of the cyclic carbonate in the non-aqueous organic solvent is 10-40%; the additives comprise a first additive as shown in a formula I and a second additive as shown in a formula II, and the reduction potential of the first additive is more than 0.95 V; the non-aqueous electrolyte satisfies the following conditions: 0.05% < = A < = 1.8%; 0.01% < = B < = 0.2%; 0.15 < = A/(B * 10) < = 10.5. Meanwhile, the invention also discloses a secondary battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte provided by the invention can effectively improve the high-temperature electrochemical performance of the secondary battery.

Description

technical field [0001] The invention belongs to the technical field of energy storage battery devices, and particularly relates to a non-aqueous electrolyte and a secondary battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, green environmental protection, etc., so that lithium-ion batteries have been widely used in 3C digital equipment and new energy power vehicles. Therefore, further improving the energy density of power batteries is one of the constant pursuits in the field of lithium-ion batteries. However, the problems of gas production and impedance growth in high-temperature storage have always been one of the main problems faced by high-energy-density power battery systems. Under high temperature conditions, the reaction of the electrolyte on the surface of the electrode material will be accelerated, resulting in the decomposition of the electrolyte to generate gas, which will cause the battery to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/056
CPCH01M10/0567H01M10/0525H01M10/056Y02E60/10
Inventor 钱韫娴胡时光邓永红林雄贵孙桂岩皮琛琦
Owner SHENZHEN CAPCHEM TECH CO LTD
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