Iodine-doped graphene-coated graded-hole Prussian blue nanospheres and preparation method and application of hierarchical pore Prussian blue nanosphere

A graphene-wrapped, Prussian blue technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of cycle instability, low charge and discharge capacity, poor conductivity, etc. Good chemical properties, good rate performance, small size effect
CN110734077AInactive Publication Date: 2020-01-31DONGGUAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
DONGGUAN UNIV OF TECH
Publication Date
2020-01-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides iodine-doped graphene-coated graded-hole Prussian blue nanospheres and a preparation method and application thereof. Inorganic acids are added to FeFe (CN) 6 nanosphere precursors at different temperatures for etching reaction to prepare FeFe (CN) 6 nanospheres with hollow graded-hole structures, and iodine-doped graphene is added for uniform and compact coating through an ultrasonic and freeze composite drying process to obtain the doped graphene-coated graded-hole Prussian blue nanospheres (namely FeFe (CN) 6 @ IG). According to the preparation method, the conductivityof the hollow graded hole FeFe (CN) 6 nanospheres can be further increased, and better performance can be maintained after multiple charging and discharging. A lithium ion battery negative electrodematerial prepared from the material has good capacity, good stability and recyclability, and the capacity maintenance rate is as high as more than 90%, and the preparation method is simple in process,convenient to operate, and suitable for large-scale industrial production.
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Description

technical field

[0001] The invention relates to the field of battery applications, in particular to a Prussian blue nanosphere with hierarchical pores wrapped by iodine-doped graphene, a preparation method and application thereof. Background technique

[0002] With the rapid development of intelligent robots and new energy electric vehicles, lithium-ion batteries (LIBs) are widely used as primary energy storage devices. Existing lithium-ion batteries mostly use graphite as the negative electrode material, due to the relatively low theoretical capacity of graphite (LiC 6 372 mAh g -1 ) limit its application in real life, especially in new energy electric vehicles. Therefore, it is imminent to develop a new generation of lithium battery electrode materials.

[0003] As the first synthetic polymer, Prussian blue (Fe 4 [Fe(CN) 6 ] 3 14H 2 O, PrussianBlue, referred to as PB), has excellent electrochemical reversibility, high stability, easy preparation, etc., so it has grea...

Claims

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