Potassium ion battery amide electrolyte with high stability and application thereof

A battery amide, high-stability technology, applied in the field of electrochemistry, achieves the effects of simple preparation process, wide sources, and important industrial application prospects

Active Publication Date: 2022-02-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte solution of the present invention can effectively alleviate the volume change of the graphite negative electrode of the potassium ion battery during charging and discharging and the instability of the electrode / electrolyte interface, and has very important industrial application prospects

Method used

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  • Potassium ion battery amide electrolyte with high stability and application thereof
  • Potassium ion battery amide electrolyte with high stability and application thereof
  • Potassium ion battery amide electrolyte with high stability and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: With KFSI as electrolyte and DMF as solvent, prepare 5 mol L -1 concentrated electrolyte. The specific steps are to weigh 1.0961g of potassium salt and add 1ml of DMF to the experimental bottle to prepare 1 mL of 5 mol L -1 KFSI / DMF electrolyte.

Embodiment 2

[0031] Embodiment 2: With KFSI as electrolyte, DMF as solvent, prepare 7 mol L -1 concentrated electrolyte. The specific steps are to weigh 1.5345g of potassium salt and add 1 ml of DMF to the experimental bottle to prepare 1 mL of 7 mol L -1 KFSI / DMF electrolyte.

Embodiment 3

[0032] Example 3: With KFSI as electrolyte and DMF as solvent, prepare 10 mol L -1 concentrated electrolyte. The specific steps are to weigh 2.1922g of potassium salt and add 1 ml of DMF to the experimental bottle to prepare 1 mL of 10 mol L -1 KFSI / DMF electrolyte.

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Abstract

The invention relates to a potassium ion battery amide electrolyte with high stability. The electrolyte comprises an amide solvent, an electrolyte and an additive, the concentration of the electrolyte is 5-14 mol L <-1 >, and the content of the additive accounts for 0-16% of the total volume of the electrolyte. The potassium ion battery amide electrolyte with high stability is used in a potassium ion battery; the electrolyte provided by the invention can buffer the volume fluctuation of graphite in the charging and discharging process, and effectively inhibit the side reaction of the electrolyte and the graphite so as to improve the electrochemical stability of the graphite; and after the additive HFE is added into the SEI film, the content of KF can be further increased to stabilize the interface between the electrode and the electrolyte, the local concentration of the electrolyte can be reduced, and the diffusion rate of ions in the battery is improved.

Description

technical field [0001] The invention relates to an amide electrolyte for a potassium ion battery, in particular to improving the electrochemical performance of a graphite negative electrode by optimizing the components of the electrolyte, and belongs to the technical field of electrochemistry. Background technique [0002] Potassium-ion batteries have properties similar to those of lithium-ion batteries and have received considerable attention in the field of large-scale energy storage in recent years. Its advantages are: (1) the reserves of potassium resources in the earth's crust are high (2.09 wt%), which can save production costs; (2) K + The standard electrode potential of / K and Li + The proximity of / Li can provide a higher output voltage; (3) K + It has a small solvation radius and a fast ion migration rate. Potassium-ion batteries work similarly to lithium-ion, based on K + It works by de-embedding back and forth between positive and negative electrodes. During...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/054H01M10/42
CPCH01M10/0567H01M10/0568H01M10/054H01M10/4235Y02E60/10
Inventor 雷凯翔杨倩李思远郑士建
Owner HEBEI UNIV OF TECH
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