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A kind of KOH intercalation mxene/cnfs composite electrode material and preparation method thereof

A composite electrode and electrospinning technology is applied in the field of preparation of KOH intercalated MXene/CNFs composite electrode materials, which can solve the problems of large MXene sheets, complex synthesis methods, toxic precursors, etc. Simple, low-cost effects

Active Publication Date: 2022-07-29
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent No. 202010909185.3 discloses a MoS for high-performance potassium-ion batteries 2 / Ti 3 C 2 The preparation method of MXene composite materials, however, HF is used for etching in the preparation of MXene, and the toxicity of HF is high, and the prepared MXene sheets are thick and the interlayer spacing is small; MoS 2 The precursors selected for the preparation are toxic, and the MoS prepared by the hydrothermal method 2 At lower temperatures, it is mostly amorphous and agglomerated severely, and high temperature annealing is required to increase crystallinity
[0006] Patent No. 202010542564.3 discloses a MOF / MXene / CF composite nanosheet and its synthesis method. MXene is easily oxidized when dried overnight at room temperature. The synthesis method mentioned in this patent is relatively complicated.

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  • A kind of KOH intercalation mxene/cnfs composite electrode material and preparation method thereof
  • A kind of KOH intercalation mxene/cnfs composite electrode material and preparation method thereof
  • A kind of KOH intercalation mxene/cnfs composite electrode material and preparation method thereof

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Embodiment 1

[0041] A preparation method of KOH intercalated MXene / CNFs composite electrode material, specifically comprising the following steps:

[0042] S1: The MAX phase Ti 3 AlC 2 Use LiF and concentrated HCl to etch in a water bath at 35 °C for 24 h, wash with deionized water at 10000-14000 rpm by high-speed centrifugation until the pH is neutral, and sonicate in an ice bath for 1 h in a nitrogen atmosphere to disperse into uniformly mixed Ti 3 C 2 Aqueous solution, then centrifuged at low speed at 3500-4000rpm to obtain Ti 3 C 2 Precipitation, freeze-drying for more than 10h to prepare MXene phase Ti 3 C 2 ;

[0043] S2: take the MXene phase Ti prepared in step S1 3 C 2 Soak in 1.8M KOH solution, stir under nitrogen atmosphere for about 4h, then centrifuge with deionized water for 3-5min at 10000rpm, repeat 3-4 times, the obtained precipitate is freeze-dried for more than 10h, and KOH-Ti is prepared 3 C 2 powder;

[0044] S3: the KOH-Ti prepared in step S2 3 C 2 The pow...

Embodiment 2

[0052] A preparation method of KOH intercalated MXene / CNFs composite electrode material, specifically comprising the following steps:

[0053] S1: The MAX phase Ti 3 AlC 2 Use LiF and concentrated HCl to etch in a water bath at 35 °C for 24 h, wash with deionized water at 10000-14000 rpm by high-speed centrifugation until the pH is neutral, and sonicate in an ice bath for 1 h in a nitrogen atmosphere to disperse into uniformly mixed Ti 3 C 2 Aqueous solution, then centrifuged at low speed at 3500-4000rpm to obtain Ti 3 C 2 Precipitation, freeze-drying for more than 10h to prepare MXene phase Ti 3 C 2 ;

[0054] S2: take the MXene phase Ti prepared in step S1 3 C 2 Soak in 1.8M KOH solution, stir under nitrogen atmosphere for about 4h, then centrifuge with deionized water for 3-5min at 10000rpm, repeat 3-4 times, the obtained precipitate is freeze-dried for more than 10h, and KOH-Ti is prepared 3 C 2 powder;

[0055] S3: the KOH-Ti prepared in step S2 3 C 2 The pow...

Embodiment 3

[0063] A preparation method of KOH intercalated MXene / CNFs composite electrode material, specifically comprising the following steps:

[0064] S1: The MAX phase Ti 3 AlC 2 Use LiF and concentrated HCl to etch in a water bath at 35 °C for 24 h, wash with deionized water at 10000-14000 rpm by high-speed centrifugation until the pH is neutral, and sonicate in an ice bath for 1 h in a nitrogen atmosphere to disperse into uniformly mixed Ti 3 C 2 Aqueous solution, then centrifuged at low speed at 3500-4000rpm to obtain Ti 3 C 2 Precipitation, freeze-drying for more than 10h to prepare MXene phase Ti 3 C 2 ;

[0065] S2: take the MXene phase Ti prepared in step S1 3 C 2 Soak in 1.8M KOH solution, stir under nitrogen atmosphere for about 4h, then centrifuge with deionized water for 3-5min at 10000rpm, repeat 3-4 times, the obtained precipitate is freeze-dried for more than 10h, and KOH-Ti is prepared 3 C 2 powder;

[0066] S3: the KOH-Ti prepared in step S2 3 C 2 The pow...

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Abstract

The invention discloses a preparation method of KOH intercalated MXene / CNFs composite electrode material, which specifically includes the following steps: 3 AlC 2 Etching; immersed in KOH solution after etching, and intercalated to obtain KOH-Ti 3 C 2 powder, then calcined to obtain KOH‑Ti 3 C 2 ‑400 powder; while carbon nanofibers are coated with Ti by electrospinning 3 C 2 can effectively suppress the two-dimensional accordion structure Ti 3 C 2 The agglomeration and stacking of the composite carbon nanofibers can improve the utilization rate of the composite material active material, and then the cycle performance and rate performance can be improved when applied to lithium ion capacitors. Ti 3 C 2 The mass ratio of ‑400 is controlled at 7wt%‑16wt%. Within this ratio, the synergistic effect of the two can be fully exerted, and the cycle and rate performance of the composite electrode material can be significantly improved.

Description

technical field [0001] The patent of the invention belongs to the technical field of battery materials, and specifically relates to a preparation method of a KOH intercalated MXene / CNFs composite electrode material. Background technique [0002] Among many electrochemical energy storage technologies, lithium-ion capacitors, as a new type of electrochemical capacitors, integrate the internal structure, materials and electrochemical mechanism of energy-based energy storage technologies, typically representing lithium-ion batteries, and power-based energy storage technologies, typically representing double batteries. Layer capacitors inherit the characteristics of high power density, long life, high safety and wide temperature range of electric double layer capacitors, and have the characteristics of high energy density of lithium ion batteries, and the cost is between lithium ion batteries and electric double layer capacitors. , has huge market application value and competitiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/50H01G11/26H01G11/86
CPCH01G11/50H01G11/26H01G11/86Y02E60/13
Inventor 王晓君冯敏刘治明胡兆伟李慧芳孙洪冉
Owner QINGDAO UNIV OF SCI & TECH
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