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Preparation method and application of potassium ion battery negative electrode energy storage material

A battery negative electrode and energy storage material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low specific capacity, cycle stability, poor rate performance, and unsatisfactory electrochemical performance, and achieve Effects of high specific capacity, good rate performance, and excellent cycle stability

Active Publication Date: 2020-04-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrochemical performance exhibited by these materials is not entirely satisfactory
Potassium-ion batteries suffer from poor rate performance, low specific capacity, and cycle stability due to a large number of potassium ions and slow kinetics

Method used

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  • Preparation method and application of potassium ion battery negative electrode energy storage material
  • Preparation method and application of potassium ion battery negative electrode energy storage material
  • Preparation method and application of potassium ion battery negative electrode energy storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of preparation method of negative electrode energy storage material of potassium ion battery, is characterized in that, specifically comprises the following steps:

[0040] (1) Collect polymer water-absorbent resin particles, weigh 3g into a clean beaker, add 60ml of distilled water, and use a shaker to shake for 1 hour. After shaking, transfer it to a polytetrafluoroethylene-lined reaction kettle, and then Incubate for 3 hours under the reaction condition of 150°C, and the pretreated superabsorbent resin is converted into a hydrogel that tends to be integrated;

[0041] (2) Then transfer the hydrogel to the refrigerator and freeze it into an ice gel for 8 hours, and finally dry and sublimate the solid ice by a freeze drying machine (that is, remove the solvent in the original aqueous solution) to obtain a dry airgel precursor;

[0042](3) Transfer the dried airgel precursor to a tube furnace and calcine at high temperature. The calcination parameters are set as ...

Embodiment 2

[0049] A kind of preparation method of negative electrode energy storage material of potassium ion battery, is characterized in that, specifically comprises the following steps:

[0050] (1) Collect polymer water-absorbent resin particles, weigh 3g into a clean beaker, add 60ml of distilled water, and use a shaker to shake for 1 hour. After shaking, transfer it to a polytetrafluoroethylene-lined reaction kettle, and then Incubate for 3 hours under the reaction condition of 150°C, and the pretreated superabsorbent resin is converted into a hydrogel that tends to be integrated;

[0051] (2) Then transfer the hydrogel to the refrigerator and freeze it into an ice gel for 8 hours, and finally dry and sublimate the solid ice by a freeze drying machine (that is, remove the solvent in the original aqueous solution) to obtain a dry airgel precursor;

[0052] (3) Transfer the dried airgel precursor to a tube furnace and calcine at high temperature. The calcination parameters are set as...

Embodiment 3

[0058] A kind of preparation method of negative electrode energy storage material of potassium ion battery, is characterized in that, specifically comprises the following steps:

[0059] (1) Collect polymer water-absorbent resin particles, weigh 3g into a clean beaker, add 60ml of distilled water, and use a shaker to shake for 1 hour. After shaking, transfer it to a polytetrafluoroethylene-lined reaction kettle, and then Incubate for 3 hours under the reaction condition of 150°C, and the pretreated superabsorbent resin is converted into a hydrogel that tends to be integrated;

[0060] (2) Then transfer the hydrogel to the refrigerator and freeze it into an ice gel for 8 hours, and finally dry and sublimate the solid ice by a freeze drying machine (that is, remove the solvent in the original aqueous solution) to obtain a dry airgel precursor;

[0061] (3) Transfer the dried airgel precursor to a tube furnace and calcine at high temperature. The calcination parameters are set as...

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Abstract

The invention discloses a preparation method of a potassium ion battery negative electrode energy storage material and application of the potassium ion battery negative electrode energy storage material in a potassium ion battery. The preparation method comprises the following steps: preparing hydrogel and xerogel precursors; transferring the precursor into a tubular furnace for preliminary calcination, and then naturally cooling; taking out the primarily calcined product, and grinding, pickling and drying in a dry environment; activating the dried sample under the grinding and mixing of KOH;transferring the product ground and mixed with potassium hydroxide into a tubular furnace for calcining; naturally cooling to room temperature; and carrying out acid pickling on the product, washing the product to be neutral by using distilled water, deionized water, ultrapure water or ethanol, and drying to obtain the potassium ion battery negative electrode energy storage material with excellentcycle performance. The preparation method disclosed by the invention is simple and low in cost, and the prepared material has a relatively large specific surface area, excellent charge-discharge specific capacity, good rate capability and excellent performance, and is suitable for production of large-scale commercial batteries.

Description

technical field [0001] The invention relates to a battery material, in particular to a preparation method and application of a negative electrode energy storage material of a potassium ion battery with excellent cycle performance, and belongs to the technical field of energy storage materials. Background technique [0002] Potassium-ion batteries (KIBs) are promising energy storage batteries considered to replace lithium-ion batteries (LIBs). KIBs have a basic principle similar to LIBs, that is, the "rocking chair" energy storage principle. For lithium, the natural abundance of potassium is more abundant than lithium, which also provides favorable conditions for further research on KIBs. Since the redox potential of K+ / K (-2.93 V) is closer to that of Li+ / Li (-3.04 V) than that of Na+ / Na (-2.71 V), it is indicated that KIBs have a higher voltage plateau and energy density. Notably, research on KIBs is still in its infancy. In addition, unlike sodium ions, potassium ions ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/054
CPCH01M4/36H01M10/054Y02E60/10
Inventor 闵宇霖杜金成范金辰时鹏辉徐群杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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