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Lithium secondary battery electrolyte and its preparation method and application

A lithium secondary battery and electrolyte technology, applied in the field of lithium secondary battery electrolyte and its preparation, can solve the problems of inability to form and dissolve nitrate, avoid direct contact, improve cycle performance, and improve Coulombic efficiency Effect

Active Publication Date: 2022-02-15
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it cannot dissolve nitrate, so it cannot form Li-rich 3 SEI of N for further improvement in stability

Method used

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  • Lithium secondary battery electrolyte and its preparation method and application
  • Lithium secondary battery electrolyte and its preparation method and application
  • Lithium secondary battery electrolyte and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0078] A preparation method for lithium secondary battery electrolyte, comprising the following steps:

[0079]1. Basic electrolyte configuration: In an argon glove box environment, ethylene carbonate (EC), diethyl carbonate (DEC), and dimethyl carbonate (DMC) will be mixed at a volume ratio of EC / DEC / DMC=1: 1:1 Use magnetic stirring to fully mix, after mixing evenly, slowly introduce lithium hexafluorophosphate into the solution, control its concentration to 1M (the formula is shown in Table 1), and stir again to obtain the basic electrolyte, ready to use.

[0080] 2. Electrolyte configuration: In an argon glove box environment, take 2ml of basic electrolyte, add lithium nitrate to it to make its concentration 0.05M, stir well until the lithium nitrate crystals are dispersed to white; then introduce boron trifluoride ether Complex, so that its concentration is 0.05M, stir evenly again until the solution is clear. To be injected into NCM811||Li battery.

Embodiment 2

[0082] The lithium secondary battery electrolyte of the present invention was prepared according to the same method as in Example 1, except that lithium nitrate crystals were changed to sodium nitrate crystals. The other steps are the same as in Example 1, and an electrolyte solution for a lithium secondary battery is prepared.

Embodiment 3

[0084] The lithium secondary battery electrolyte of the present invention was prepared according to the same method as in Example 1, except that lithium nitrate crystals were changed to silver nitrate crystals. The other steps are the same as in Example 1, and an electrolyte solution for a lithium secondary battery is prepared.

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Abstract

The invention provides a lithium secondary battery electrolyte and a preparation method and application thereof, which belong to the technical field of batteries. The lithium secondary battery electrolyte includes conventional commercial ester electrolyte additives and cosolvents, the additives are nitrates, which can participate in the formation of an interface layer and improve the overall performance of the battery; the cosolvents include boron trifluoride-based complexes. Compounds can make nitrates dissolve in ester solvents and broaden the scope of application of nitrate additives. The lithium secondary battery electrolyte of the present invention exhibits high reversible specific capacity and excellent cycle stability when it is matched with a metal lithium battery assembled with a conventional NCM ternary material and a silicon-based negative electrode lithium ion battery, and is a new type of high A practical electrolyte for specific energy lithium secondary battery systems.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrolyte solution for a lithium secondary battery and a preparation method and application thereof. Background technique [0002] As a new type of green energy storage device, lithium secondary battery is widely used in 3C consumer electronics and electric vehicles because of its advantages such as high working voltage, large specific capacity, long cycle life and low self-discharge rate. and other fields. With the continuous development of these applications and the upgrading of social needs, people put forward higher requirements for various performance indicators of lithium secondary batteries, especially energy density and cycle life. [0003] Since the working potential of most commonly used negative electrodes is extremely low, during the battery formation process, the negative electrode at the working potential will directly undergo a chemical reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/052H01M10/0525
CPCH01M10/0569H01M10/0567H01M10/052H01M10/0525H01M2300/0025H01M2300/0037Y02E60/10
Inventor 李金熠田一帆鲁卓雅程晓彦岳风树
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD