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Lithium ion battery, lithium ion battery electrolyte and preparation method thereof

A lithium-ion battery and electrolyte technology, which is applied in the manufacture of electrolyte batteries, batteries, secondary batteries, etc., can solve the problems of large gas production and rapid cycle decay of high-nickel ternary power batteries, so as to reduce gas production and improve circulation. performance, improved compatibility

Active Publication Date: 2020-12-01
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a lithium-ion battery electrolyte, which aims to solve the technical problems of the existing high-nickel ternary power battery with fast cycle attenuation and large gas production

Method used

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  • Lithium ion battery, lithium ion battery electrolyte and preparation method thereof
  • Lithium ion battery, lithium ion battery electrolyte and preparation method thereof
  • Lithium ion battery, lithium ion battery electrolyte and preparation method thereof

Examples

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preparation example Construction

[0044] Preparation of the positive electrode sheet: the positive electrode active material LiNi 0.8 co 0.1 mn 0.1 o 2 , conductive carbon, binder PVDF (full name in English, polyvinylidene fluoride) and N-methylpyrrolidone (NMP) are mixed evenly to make positive electrode slurry. The solid content of positive electrode slurry is 72wt%, in which LiNi 0.8 co 0.1 mn 0.1 o 2 : The mass ratio of conductive carbon: PVDF is 97:2:1. The positive electrode slurry was coated on the aluminum foil of the current collector, dried at 80°C and then cold pressed, then cut into pieces, and placed in a vacuum oven at 85°C for 12 hours to make the positive electrode sheet of the lithium ion battery.

[0045] Preparation of the negative electrode sheet: the negative electrode active material graphite and SiO x , conductive carbon, thickener CMC, and binder styrene-butadiene rubber (SBR) were uniformly mixed in deionized water to prepare negative electrode slurry. The solid content of the...

Embodiment 1

[0056] Electrolyte preparation: Mix ethylene carbonate, ethyl methyl carbonate and diethyl carbonate at a volume ratio of 1:1:1, and then add 13wt% lithium hexafluorophosphate based on the total weight of the lithium-ion battery electrolyte, and add 1wt % Compound 1 additive.

[0057] Preparation of high-energy-density lithium-ion battery: stack the above-mentioned positive electrode sheet, 18um polyethylene separator, and negative electrode sheet in order to form a square battery cell, weld the tabs, and use aluminum-plastic film packaging , perfusing the electrolyte solution prepared above, after aging, chemical formation, shaping, capacity testing and other processes, the battery is made.

Embodiment 2

[0059] Preparation of the electrolyte: mix ethylene carbonate, ethyl methyl carbonate and diethyl carbonate at a volume ratio of 1:1:1, and then add 13wt% lithium hexafluorophosphate based on the total weight of the lithium-ion battery electrolyte after mixing thoroughly, and add 5wt% % Compound 1 additive.

[0060] Preparation of high-energy-density lithium-ion battery: stack the above-mentioned positive electrode sheet, 18um polyethylene separator, and negative electrode sheet in order to form a square battery cell, weld the tabs, and use aluminum-plastic film packaging , perfusing the electrolyte solution prepared above, after aging, chemical formation, shaping, capacity testing and other processes, the battery is made.

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Abstract

The invention discloses a lithium ion battery, an electrolyte solution of the lithium ion battery and a preparation method thereof, comprising: an additive; the additive includes a bridged ring carboxylate. Beneficial technical effects of the present invention: through the research of a large number of compounds with similar structures, it is found that increasing the branch chain of the alkane structure on the alpha carbon on one side of the active group helps to weaken the activity of the active group. Therefore, the present invention improves the compatibility of carboxylate and lithium salt by adding alkanes on one side of the carboxylate. In addition, the use of alkanes in the bridging ring is easy to open the ring to form free radicals when the negative electrode is reduced to form a copolymer. The protective film can exist more stably, thereby improving the cycle performance of the power battery and reducing gas production.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a lithium ion battery, an electrolyte solution of the lithium ion battery and a preparation method thereof. Background technique [0002] With the popularity of electric vehicles around the world, the market has put forward higher requirements for the mileage and safety performance of electric vehicles. The high-nickel ternary power battery has a considerable energy density, and with the nickel content in the ternary material The specific capacity of the material also increases, but the instability of the positive electrode structure and the decomposition reaction of the electrolyte are also intensified, resulting in increased gas production during high-temperature storage, which in turn affects the service life of the battery. [0003] In order to improve the high-temperature gas production, one of the currently used methods is to add acid anhydrides as additives to the electrolyte. Al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 吕国显褚春波张耀王明旺
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD