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Preparation method of high-safety high-voltage electrolyte containing nitrile compounds

A compound and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of limited solubility of lithium hexafluorophosphate, poor reduction stability of nitrile compounds, and insufficient compatibility, so as to improve negative electrode incompatibility, High boiling point, the effect of improving high voltage stability

Pending Publication Date: 2022-04-26
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduction stability of nitrile compounds is poor, and the compatibility with the negative electrode is insufficient.
On the other hand, the aliphatic nitrile compounds have a negative effect on the commercial lithium salt lithium hexafluorophosphate (LiPF 6 ) has limited solubility, and the lithium salts used in nitrile electrolytes are mostly organic anion lithium salts with large volumes, such as lithium bistrifluoromethanesulfonylimide (LiTFSI)

Method used

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  • Preparation method of high-safety high-voltage electrolyte containing nitrile compounds
  • Preparation method of high-safety high-voltage electrolyte containing nitrile compounds
  • Preparation method of high-safety high-voltage electrolyte containing nitrile compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: in the glove box that is full of high-purity argon, the CHF of 0.5vol.% 2 CF 2 CF 2 CF 2 CH 2 OCH 2 CH 2 CN(OPON) added to 1M LiPF 6 / EC:EMC:DMC (1:1:1) in a commercial carbonate electrolyte. The electrolyte using the above-mentioned fluorine-containing nitrile compound additive, the diaphragm is Celgard2400, and Graphite / LiCoO is assembled 2 The battery is subjected to a rate performance test under the condition of 2.8-4.2V; the charge and discharge procedure is to cycle at a rate of 0.05C for 3 weeks, and then cycle at 0.1C, 0.2C, 0.5C, 1C, and 0.2C for 5 weeks.

Embodiment 2

[0033] Embodiment 2: in the glove box that is full of high-purity argon, the CF of 1vol.%3 CF 2 CH 2 OCH 2 CH 2 CN(F5EON) added to 1M LiPF 6 / EC:EMC:DMC (1:1:1) in a commercial carbonate electrolyte. The electrolyte using the above-mentioned fluorine-containing nitrile compound additive, the diaphragm is Celgard2400, and Graphite / LiCoO is assembled 2 The battery is subjected to a rate performance test under the condition of 2.8-4.5V; the charge and discharge procedure is to cycle at a rate of 0.05C for 3 weeks, and then cycle at 0.1C, 0.2C, 0.5C, 1C, and 0.2C for 5 weeks.

Embodiment 3

[0034] Example 3: In a glove box filled with high-purity argon, 0.8M LiTFSI and 0.2M LiODFB were dissolved in fluoroethylene carbonate (FEC) and CF with a volume ratio of 1:3 3 CF 2 CH 2 OCH 2 CH 2 CN(F5EON) mixed solvent. Use the electrolyte of the above-mentioned fluorine-containing nitrile compound, the diaphragm is Celgard2400, assemble a Li / Graphite battery, and charge and discharge the test under the condition of 0.001-2.0V; Cycle at 0.1C.

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Abstract

The invention discloses a preparation method of a high-safety high-voltage electrolyte containing nitrile compounds, and belongs to the technical field of lithium ion battery materials. According to the electrolyte containing the nitrile compound disclosed by the invention, the structural formula of the nitrile compound is Rf-O-(CH2CH2O) nCH2CH2CN, the Rf group is fluoroalkyl, n is an integer of 0 or 1, and the nitrile compound has the characteristics of high safety, oxidation-resistant stability and high ionic conductivity when being used as the electrolyte. The fluorine-containing nitrile compound electrolyte disclosed by the invention shows good cycle performance and rate capability in a high-voltage lithium ion battery system. The fluoronitrile compound disclosed by the invention is simple to prepare, has relatively good electrochemical stability, and has a certain application prospect when being used as a lithium ion battery electrolyte.

Description

Technical field: [0001] The invention relates to a method for preparing a high-safety high-voltage electrolyte containing nitrile compounds, and belongs to the technical field of lithium-ion battery materials. Background technique: [0002] As an important part of lithium-ion batteries, electrolyte has a very important impact on the performance of lithium-ion batteries. Traditional lithium-ion battery electrolytes mostly use organic carbonates as solvents, but the application of such solvents to high-voltage positive batteries will cause many problems. First of all, the oxidative decomposition voltage of organic carbonate solvents is 4.3V. When applied to a 4.5V high-voltage positive electrode material system, it is easy to oxidize and generate gas on the surface of the electrode, resulting in dry electrolyte, increased internal resistance of the battery and battery failure. Problems such as sharp increase in internal pressure. Secondly, organic carbonate solvents have the...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 汪靖伦肖田鑫湛雅丽夏继泽周鑫彭丹
Owner HUNAN UNIV OF SCI & TECH
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