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Lithium secondary battery electrolyte and application thereof

A lithium secondary battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of inability to form electrolyte, easy to cause side reactions, insufficient ether solvent, etc., and achieve excellent long-term cycle stability , high coulombic efficiency, the effect of improving performance

Pending Publication Date: 2022-05-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for ether HCEs or LHCEs, LiNO 3 Solubility is also very low, unable to form a clear and transparent electrolyte
promote LiNO 3 Dissolution can introduce solubilizers such as CuF 2 (Angew.Chem.Int.Ed.2018,57,14055-14059), Sn 2+ (Adv. Mater. 2020, 32, 2001740), In 3+ (Adv.Funct.Mater.2020,30,2003800), tris(pentafluorophenyl)boron or tris(pentafluorophenyl)phosphine (Angew.Chem.Int.Ed.2020,59,14935-14941), sulfolane (ACS Energy Lett. 2021, 6, 1839-1848), LiBF 4 (Nano Energy 2021,89,106353), etc., but the introduction of solubilizer is easy to cause side reactions, and it is inconvenient to use

Method used

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  • Lithium secondary battery electrolyte and application thereof
  • Lithium secondary battery electrolyte and application thereof
  • Lithium secondary battery electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Tetrabutylammonium nitrate additive and its application in Li / / NCM811 batteries

[0030] Tetrabutylammonium nitrate involved in the present embodiment (abbreviated TBANO 3 ) The structural formula of the additive is as figure 1 shown. The TBANO involved in this embodiment 3 The application of additives in Li / / NCM811 battery (a lithium metal battery) is as follows:

[0031] (1) Electrolyte preparation:

[0032] In an argon glove box, weigh the solvent ethylene glycol dimethyl ether (DME for short), the inert solvent 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (abbreviated as TTE) and lithium salt bisfluorosulfonimide lithium (abbreviated as LiFSI), the molar ratio of the three is 2.1:2.1:1, then add 2wt.% TBANO 3 Additives, magnetically stirred for more than 24 hours, recorded as TDF+TBANO 3 . As a comparison, this example also prepared an electrolyte solution without any additives, denoted as TDF, wherein the molar ratio of DME, TTE, an...

Embodiment 2

[0046] Embodiment 2: Tetrabutylammonium nitrate additive and its in Li / / LiCoO 2 Application in battery

[0047] Tetrabutylammonium nitrate involved in the present embodiment (abbreviated TBANO 3 ) The structural formula of the additive is as figure 1 shown. The TBANO involved in this embodiment 3 Additives in Li / / LiCoO 2 Applications in batteries (a lithium metal battery) are as follows:

[0048] (1) Electrolyte preparation:

[0049] In an argon glove box, weigh the solvent ethylene glycol dimethyl ether (DME for short), the inert solvent 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (abbreviated as TTE) and lithium salt bisfluorosulfonimide lithium (abbreviated as LiFSI), the molar ratio of the three is 3:3:1, then add 5wt.% TBANO 3 Additive, magnetic stirring for more than 24 hours, recorded as TDF331+TBANO 3 .

[0050] (2)Li / / LiCoO 2 Battery assembly and testing:

[0051] Using 2016-type button battery case, lithium sheet (thickness 1mm, diameter 15.6m...

Embodiment 3

[0055] Embodiment 3: three (lauryl) methyl ammonium nitrate additives and its application in graphite / / NCM811 batteries

[0056] This embodiment relates to three (dodecyl) methyl ammonium nitrate (abbreviated TDMANO 3 )additive. The TDMANO involved in this embodiment 3 The application of additives in graphite / / NCM811 battery (a lithium-ion battery) is as follows:

[0057] (1) Electrolyte preparation:

[0058] In an argon glove box, weigh the solvent ethylene glycol dimethyl ether (DME for short), the inert solvent 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (abbreviated as TTE) and lithium salt bisfluorosulfonimide lithium (abbreviated as LiFSI), the molar ratio of the three is 2.1:2.1:1, then add the TDMANO of 2wt.% mass fraction 3 Additives, magnetically stirred for more than 24 hours, recorded as TDF+TDMANO 3 .

[0059] (2) Graphite / / NCM811 battery assembly and testing:

[0060] Using 2016-type button battery case, graphite negative plate (diameter 13mm)...

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Abstract

The invention belongs to the field of batteries, and particularly relates to a lithium secondary battery electrolyte and application thereof. The lithium secondary battery electrolyte comprises an ether solvent and a quaternary ammonium nitrate additive, and the additive comprises quaternary ammonium cations and nitrate anions. Compared with LiNO3, the quaternary ammonium nitrate additive has higher solubility, the self-solubilizing effect can be achieved without introducing a solubilizer, and a clear and transparent electrolyte can be formed more easily. On the negative electrode side, the quaternary ammonium nitrate additive can promote uniform deposition / stripping of Li < + >, so that the Li / / Cu half cell shows extremely high coulombic efficiency; on the positive electrode side, the quaternary ammonium nitrate additive can enable the electrolyte containing LiFSI, LiTFSI and other lithium salts to overcome the problems of corrosion of an aluminum current collector and corrosion of a stainless steel shell of a button cell, so that the electrolyte can be matched with 4.5 V vs.Li / Li < + > and above high-voltage positive electrodes, and excellent specific capacity and long-term cycle stability are shown.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to an electrolyte solution for a lithium secondary battery and an application thereof. Background technique [0002] In order to meet the urgent needs of the society for high energy density and high power density, researchers are actively seeking technological breakthroughs in a new generation of electrochemical energy storage systems. The lithium metal anode has a very high theoretical specific capacity (3860mAh g -1 ) and extremely low electrode potential (-3.040V vs. SHE), it is an ideal negative electrode material for lithium secondary batteries. However, problems such as Li dendrite nucleation growth, low Li deposition / stripping Coulombic efficiency, and poor safety seriously hinder the practical application of Li metal anodes. On the other hand, high-voltage cathodes, such as ternary cathodes LiNi 1-x-y co x mn y o 2 , is an important direction for the development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525Y02E60/10
Inventor 郑明森董全峰范镜敏段佳宁
Owner XIAMEN UNIV
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