Electrolyte added with 4-nitrobenzenesulfonic acid pentafluorophenyl ester and homologues and lithium battery

A technology of pentafluorophenyl nitrobenzene sulfonate and electrolyte, applied in the field of lithium batteries, can solve problems such as capacity decay and potential safety hazards, and achieve the effects of delaying capacity decay, prolonging service life and solving the problem of capacity decay.

Pending Publication Date: 2022-07-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an electrolyte and lithium battery with 4-nitrobenzenesulfonic acid pentafluorophenyl ester and homologues added, which solves the problem of capacity decay of positive electrode materials under high cut-off voltage and dendrite growth of lithium metal negative electrodes. The potential safety hazards caused by adding additives can effectively delay the capacity decay of the positive electrode material, inhibit the growth of lithium dendrites, and improve the life of the battery

Method used

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  • Electrolyte added with 4-nitrobenzenesulfonic acid pentafluorophenyl ester and homologues and lithium battery
  • Electrolyte added with 4-nitrobenzenesulfonic acid pentafluorophenyl ester and homologues and lithium battery
  • Electrolyte added with 4-nitrobenzenesulfonic acid pentafluorophenyl ester and homologues and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] in the glove box (H 2 O2 6 ), which was dissolved in a non-aqueous organic solution to obtain a base electrolyte. Lithium salt concentration: 1M lithium hexafluorophosphate (LiPF6); non-aqueous organic solvent: mixed solvent of ethylene carbonate (EC):ethyl methyl carbonate (EMC)=3:7 (v:v). The compound represented by the formula R2 with a mass fraction of 1.0 wt % was added to the base electrolyte, and the implementation electrolyte 1 was obtained after stirring uniformly.

Embodiment 2

[0042]The electrolyte solution was prepared according to the method of Example 1, except that R1 with a mass fraction of 1.0 wt % was added to the base electrolyte solution to obtain the implementation electrolyte solution 2.

Embodiment 3

[0044] The electrolyte solution was prepared according to the method of Example 1, except that the R2 compound with a mass fraction of 0.5 wt% was added to the base electrolyte solution to obtain the implementation electrolyte solution 3.

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Abstract

The invention discloses an electrolyte added with 4-nitrobenzenesulfonic acid pentafluorophenyl ester and homologues, which comprises lithium salt, a non-aqueous organic solvent and an additive, the additive is 4-nitrobenzenesulfonic acid pentafluorophenyl ester, the weight percentage content of the additive is 0.01-10wt%, the non-aqueous organic solvent is a mixture of cyclic carbonate and chain carbonate, the weight percentage content of the non-aqueous organic solvent is 0.01-10wt%, the weight percentage content of the chain carbonate is 0.01-10wt%, and the weight percentage content of the chain carbonate is 0.01-10wt%. And the concentration of the lithium salt is 0.1-4 M. By adopting the electrolyte added with the pentafluorophenyl 4-nitrobenzenesulfonate and the homologues, the problem of capacity fading of the positive electrode material under high cut-off voltage and the problem of potential safety hazards caused by lithium metal negative electrode dendritic crystal growth are solved, and by adding the additive, the capacity fading of the positive electrode material can be effectively delayed, the growth of lithium dendrites can be inhibited, and the service life of the positive electrode material is prolonged. The service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrolyte and a lithium battery added with pentafluorophenyl 4-nitrobenzenesulfonate and homologues. Background technique [0002] The existing energy storage technology has been difficult to meet the high power density and energy density requirements of electric vehicles and electronic equipment. Improving the cut-off voltage of cathode materials and using lithium metal anodes to prepare high-energy-density lithium metal batteries have broad application prospects. However, the high cut-off voltage will significantly intensify the side reaction between the positive electrode material and the electrolyte and reduce the positive electrode capacity. The lithium metal negative electrode is likely to form lithium dendrites during the battery cycle, causing safety hazards, resulting in failed lithium and reducing the Coulombic efficiency. These problems limit the applic...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/056H01M10/052
CPCH01M10/0567H01M10/056H01M10/052
Inventor马建民王中升
OwnerHUNAN UNIV