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Electrolyte additive, electrolyte containing additive and lithium ion battery using electrolyte

An electrolyte additive and additive technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of reduced lithium ion conductivity, shortened service life, and reduced battery performance, so as not to cause volume expansion and reduce gas generation , the effect of inhibiting damage

Active Publication Date: 2015-07-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the halosilane functionalized carbonate electrolyte of the prior art is reduced to hydrogen halide at the negative electrode, and the hydrogen halide reacts with the electrolyte solution to generate lithium halide which is continuously deposited on the surface of the negative electrode, resulting in thickening of the SEI film and lithium ions The conductivity is reduced, and a large amount of gas generated during battery operation is easy to cause the volume expansion of the battery, which leads to the degradation of battery performance and shortened service life; and then proposes a composition of electrolyte that can form an SEI film on the electrode surface to prevent the electrode. Electrolyte additives that reduce loss without degrading battery performance and shortening battery life

Method used

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  • Electrolyte additive, electrolyte containing additive and lithium ion battery using electrolyte
  • Electrolyte additive, electrolyte containing additive and lithium ion battery using electrolyte
  • Electrolyte additive, electrolyte containing additive and lithium ion battery using electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] 81g of ethylene carbonate, 16g of LiPF 6 and 3 g of bis(trimethylsiloxy)methoxysilyl-vinyl butylene carbonate were uniformly mixed to obtain electrolyte solution 1.

[0097] In the argon glove box, the positive electrode sheet, separator and negative electrode sheet commonly used for lithium-ion secondary batteries are stacked in sequence and wound into a square electrode group, and the electrode group is placed in a 4.0mm×46mm×57mm The lithium-ion battery 1 is obtained through the processes of storage, formation, molding, capacity separation and aging after sealing. The nominal capacity of the battery is: 1C=750mAh.

Embodiment 2

[0099] The propylene carbonate of 40g, the dimethyl carbonate of 51g, the LiClO of 8.3g 4 and 0.7 g of bis(triethylsiloxy)methoxysilyl-vinyl butylene carbonate were uniformly mixed to obtain electrolyte solution 2.

[0100] In the argon glove box, the positive electrode sheet, separator and negative electrode sheet commonly used for lithium-ion secondary batteries are stacked in sequence and wound into a square electrode group, and the electrode group is placed in a 4.0mm×46mm×57mm The battery case is softly packaged, then vacuum-baked, injected with electrolyte solution 2, sealed, and then stored, formed, formed, volume-divided and aged to obtain a lithium-ion battery 2. The nominal capacity of the battery is: 1C=750mAh.

Embodiment 3

[0102] 40g of diethyl carbonate, 20g of methyl formate, 23g of methyl acetate, 8g of LiBF 4 , 7g of LiAsF 6 and 2 g of bis(trimethylsiloxy)methoxysilyl-propenyl butylene carbonate were uniformly mixed to obtain electrolyte solution 3.

[0103] In the argon glove box, the positive electrode sheet, separator and negative electrode sheet commonly used for lithium-ion secondary batteries are stacked in sequence and wound into a square electrode group, and the electrode group is placed in a 4.0mm×46mm×57mm Soft-packed battery case, then vacuum baked, injected electrolyte 3, sealed and then stored, formed, formed, divided and aged to produce lithium-ion battery 3. The nominal capacity of the battery is: 1C=750mAh.

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Abstract

The invention discloses an electrolyte additive. The additive is carbonic ester containing silicon alkyl and alkylene, wherein the silicon alkyl is connected with methoxy or ethoxy and alkyl. The invention also provides electrolyte containing the additive and a lithium ion battery using the electrolyte on the basis of the electrolyte additive. The electrolyte containing the additive can form a tough envelope on the surface of an electrode, so as to reduce the reaction between the electrode and the electrolyte, and the additive can decompose gases generated in an electrolysis process, so that high capacity and low inflation rate of the battery are maintained, and the service life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to an electrolyte additive, an electrolyte containing the additive, and a lithium ion battery using the prepared electrolyte, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have large capacity, fast charging speed, and long cycle life, and have been widely used in various electronic devices in daily life. A large number of studies have shown that the main reason for shortening the service life of lithium-ion batteries is that the electrodes are prone to react with the electrolyte in a high-temperature and high-pressure environment, resulting in loss of electrode materials and deterioration of the electrolyte. All kinds of changes can easily lead to poor battery performance and shortened service life. The current solution is to add stabilizing additives to the electrolyte to inhibit the reaction between the electrode and the electrolyte, such as fluorobenzene, cyclohe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567C07F7/18
CPCC07F7/18H01M10/0525H01M10/0567Y02E60/10
Inventor 刘卫平朱小明
Owner BYD CO LTD
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