Preparation method of ultrahigh-rate potassium ion battery bismuth-based composite negative electrode material

A negative electrode material, potassium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult control of material morphology, affecting the performance of potassium ion batteries, and low utilization of active materials, so as to increase the magnification and cycle stability, novel and stable structure, and stable electrode material structure

Active Publication Date: 2022-07-22
JINAN UNIVERSITY
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  • Abstract
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Problems solved by technology

For example, CN113839038A discloses a preparation method and application of a MOF-derived bismuth@carbon nanocomposite material, in which a bismuth salt and a ligand are solvothermally reacted to prepare a MOF precursor, and calcined in an inert atmosphere to obtain a Bi@C composite material; the The material preparation method is simple, but the morphology and structure of the prepared material are not easy to control
CN112542577A discloses a two-dimensional composite material of nanobismuth / nitrogen-doped carbon foam nanosheets and its preparation method and application, and synthesized a nitrogen-doped carbon nanofoam nanosheet composite material containing nanobismuth particles by solvothermal method; The material has a "yolk-shell" microstructure, but its bismuth nanoparticles content is too much, and the utilization rate of active materials is not high, which affects the performance of potassium ion batteries

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  • Preparation method of ultrahigh-rate potassium ion battery bismuth-based composite negative electrode material
  • Preparation method of ultrahigh-rate potassium ion battery bismuth-based composite negative electrode material
  • Preparation method of ultrahigh-rate potassium ion battery bismuth-based composite negative electrode material

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Embodiment 1

[0052] A preparation method of an ultra-high rate spindle-shaped carbon-coated bismuth-based potassium ion battery anode material:

[0053] (1) Add 1.94g of bismuth nitrate pentahydrate into 40mL of ethylene glycol, stir for 0.5h to disperse uniformly to obtain a bismuth source solution; add 0.47g of ammonium metavanadate to 20mL of deionized water, stir for 0.5h to disperse uniformly to obtain ammonium metavanadate solution.

[0054] (2) Under stirring, slowly drop the ammonium metavanadate solution into the bismuth source solution, and stir for 0.5 h to obtain a yellow uniform solution.

[0055] (3) The yellow homogeneous solution was placed in a 100 mL hydrothermal reaction kettle, and the hydrothermal reaction was carried out at 180 °C for 24 h, and then filtered and dried to obtain BiVO 4 Precursor (bismuth vanadate precursor with spindle morphology and hierarchical structure), TEM images and SEM images are shown in figure 1 and figure 2 , see the X-ray diffraction pa...

Embodiment 2

[0062] Same as Example 1, the difference lies in that step (1) is as follows: add 1.94 g of bismuth nitrate pentahydrate to 40 mL of ethylene glycol, stir for 0.5 h to disperse evenly to obtain a bismuth source solution; add 0.47 g of ammonium metavanadate to 40 mL of deionized In water, stir for 0.5h to disperse uniformly to obtain ammonium metavanadate solution.

Embodiment 3

[0064] Same as Example 1, the difference is that step (1) is as follows: add 1.94 g of bismuth nitrate pentahydrate to 20 mL of ethylene glycol, stir for 0.5 h to disperse evenly to obtain a bismuth source solution; add 0.47 g of ammonium metavanadate to 40 mL of deionized In water, stir for 0.5h to disperse uniformly to obtain ammonium metavanadate solution.

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Abstract

The invention discloses a preparation method of an ultrahigh-rate potassium ion battery bismuth-based composite negative electrode material, and belongs to the technical field of potassium ion batteries. The preparation method of the composite negative electrode material comprises the following steps: (1) dropwise adding an ammonium metavanadate solution into a bismuth source solution, uniformly stirring to obtain a yellow solution, and carrying out hydrothermal reaction to obtain a BiVO4 precursor; and (2) ultrasonically dispersing the BiVO4 precursor in a buffer solution, adding dopamine hydrochloride, stirring and reacting to obtain a polydopamine-coated BiVO4 composite material, and calcining in an inert atmosphere to obtain the ultrahigh-rate bismuth-based composite negative electrode material for the potassium ion battery. The synthesis method is simple, the material morphology structure is novel and stable, the utilization rate of active substances is high, the electrode material structure is stable, the number of active sites is large, and the rate and cycling stability of the potassium ion battery are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of potassium ion batteries, in particular to a preparation method of a bismuth-based composite negative electrode material for an ultra-high rate potassium ion battery. Background technique [0002] Today, exploring high-energy-density potassium-ion batteries (PIBs) with fast charging capability is an urgent need to meet the rapid growth of mobile electronics and electric vehicles (EVs). However, the energy power density of PIBs is mainly limited by the low capacity and poor fast charging capability of conventional intercalated graphite anodes. Recently, much effort has been devoted to promising anode materials with high energy density, such as phosphorus (P) and silicon (Si), while little attention has been paid to the fast charging capability of batteries. [0003] Bismuth (Bi)-based electrode materials with high volumetric capacity and suitable operational potential have been actively investigated. As a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M4/628H01M10/054H01M2004/027Y02E60/10
Inventor 李宏岩刘喜孙影娟
Owner JINAN UNIVERSITY
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