Prussian blue derived core-shell cubic material as well as preparation method and application thereof

A technology of Prussian blue and cubes, applied in nanotechnology for materials and surface science, carbon preparation/purification, final product manufacturing, etc., can solve the problem of reducing electrode material cycle life and rate performance, active material loss, material structure Problems such as pulverization, to achieve the effect of enhancing cycle stability and reversible specific capacity, improving stability, and improving reversibility

Active Publication Date: 2021-11-05
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors have found that the structure of the existing transitional iron-based selenide materials is unstable, the conductivity is relatively poor, and large volume expansion is prone to occur, resulting in the pulverization of the material structure and falling off from the current collector, resulting in the loss of active materials and reducing the cycle life and rate performance of electrode materials

Method used

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  • Prussian blue derived core-shell cubic material as well as preparation method and application thereof
  • Prussian blue derived core-shell cubic material as well as preparation method and application thereof
  • Prussian blue derived core-shell cubic material as well as preparation method and application thereof

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preparation example Construction

[0030] The preparation method of the Prussian blue compound comprises: dissolving polyvinylpyrrolidone (PVP) and potassium ferricyanide in dilute hydrochloric acid, and aging treatment; or, the mass ratio of PVP and potassium ferricyanide is 6-24:1 .

[0031] The polymerization reaction is a reaction for preparing phenolic resin; further, the raw materials for preparing phenolic resin are resorcinol and formaldehyde. The use of phenolic resin is more conducive to enhancing the structural stability of the electrode material during the calcination process, increasing the network dimension, and obtaining a three-dimensional network structure with a complete core-shell cubic structure. At the same time, it is beneficial to alleviate the volume expansion effect of the cubic electrode material during battery charging and discharging, and enhance structural stability. for better electrochemical performance.

[0032]Specifically, the preparation process of the phenolic resin is obtai...

Embodiment 1

[0041] Prussian Blue Derived 3D Network Fe 7 Se 8 - Preparation method of C@C core-shell cubic electrode material:

[0042] (1) Dissolve polyvinylpyrrolidone (PVP, K-30, MW=40000) and potassium ferricyanide with a mass ratio of 24:1 in 300ml of 0.1mol / L dilute hydrochloric acid solution, and age in an oven at 80°C After 24 hours of treatment, a Prussian blue (PB) solution was obtained. The precipitate was washed by centrifugation with ethanol and deionized water, dried in vacuo, and the solid was collected to obtain a precipitate of Prussian blue PB.

[0043] (2) Pour 0.1g of PB into a mixed solution of deionized water and absolute ethanol with a volume ratio of 7:3, stir with magnetic force for 30min, and then add CTAB and resorcinol with a mass ratio of 6:1, and The volume ratio is 1:6 ammonia water (concentration: 26.0wt.%) and formaldehyde solution, react for 8h. The precipitate was washed by centrifugation with ethanol and deionized water, and vacuum-dried to obtain a...

Embodiment 2

[0052] Prussian Blue Derived 3D Network Fe 7 Se 8 - Preparation method of C@C core-shell cubic electrode material:

[0053] (1) Dissolve polyvinylpyrrolidone (PVP, K-30, MW=40000) and potassium ferricyanide with a mass ratio of 18:1 in 300ml of 0.1mol / L dilute hydrochloric acid solution, and age in an oven at 80°C After 24 hours of treatment, a Prussian blue (PB) solution was obtained. The precipitate was washed by centrifugation with ethanol and deionized water, dried in vacuo, and the solid was collected to obtain a precipitate of Prussian blue PB.

[0054] (2) Pour 0.1g of PB into a mixed solution of deionized water and absolute ethanol with a volume ratio of 7:4, magnetically stir and stir for 30min, and then add CTAB and resorcinol with a mass ratio of 3:1, and The volume ratio is 1:5 ammonia water (concentration: 26.0wt.%) and formaldehyde solution, react for 6h. The precipitate was washed by centrifugation with ethanol and deionized water, and dried in vacuum to obt...

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Abstract

The invention belongs to the technical field of lithium ion battery material preparation, and relates to a Prussian blue derived core-shell cubic material and a preparation method and application thereof. The core of the Prussian blue derived core-shell cubic material is Fe7Se8 nanoparticles embedded in a carbon network, the shell is a porous carbon layer, and cubes are connected through carbon bridges to form a three-dimensional network structure. According to the structure, the conductivity and the structural stability are improved, the high-flux transmission of lithium ions is realized, and the electrochemical performance of a lithium ions is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery materials, and relates to a core-shell cubic material derived from Prussian blue, a preparation method and an application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, the growth trend of the market share of new room temperature lithium-ion secondary batteries in the energy storage fields such as smart phones, notebook computers, hybrid electric vehicles and extended-range electric vehicles is gradually increasing. However, the development of lithium-ion batteries in large-scale energy storage fields such as household power distribution and communicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/136H01M10/058H01M10/0525C01B19/04C01B32/05B82Y30/00B82Y40/00
CPCH01M4/581H01M4/625H01M4/136H01M10/058H01M10/0525C01B19/007C01B32/05B82Y30/00B82Y40/00C01P2004/03C01P2004/62C01P2004/80Y02P70/50Y02E60/10
Inventor 董士花孙强贾冰姚树玉田健刘吉云陈蕴博
Owner SHANDONG UNIV OF SCI & TECH
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