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US 2024/0188191 A1Published application
Composite heating film and manufacturing method therefor
AssigneeIucf-Hyu (Industry-University Cooperation Foundation Hanyang University)
InventorsTae Hee HAN, Dong Jun KANG, Sung Hyun NOH, Ki Hyun LEE
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Abstract
Provided is a composite heating film. The composite heating film includes conductive sheets stacked in a layered structure. Metal/metal oxide composite particles intercalated between neighboring conductive sheets among the conductive sheets are positioned. The composite heating film can generate heat with high efficiency even at a low operating voltage and can be used as a portable heating unit due to having a light weight.
Claims17
1:
- A composite heating film comprising:
- conductive sheets stacked in a layered structure;
- and
- metal/metal oxide composite particles intercalated between neighboring conductive sheets among the conductive sheets.
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2:
- The composite heating film of claim 1, wherein the conductive sheet is a two-dimensional material.
3:
- The composite heating film of claim 2, wherein the conductive sheet is graphene, graphene oxide (GO), reduced graphene oxide (rGO), MXenes, transition metal dichalcogenides (TMDCs), or a combination thereof.
4:
- The composite heating film of claim 1, wherein the metal/metal oxide composite particle includes a metal oxide particle and a metal part provided at a portion of the metal oxide particle.
5:
- The composite heating film of claim 4, wherein the metal part is made by locally reducing a portion of the surface or inside of the metal oxide particle.
6:
- The composite heating film of claim 4, wherein the metal oxide particle is an insulator, and the metal part is a conductor.
7:
- The composite heating film of claim 4, wherein the metal part is a conductive pathway electrically connecting the conductive sheets.
8:
- The composite heating film of claim 1, wherein the metal/metal oxide composite particle is a phase-separated mixture of a metal oxide and a metal reduced therefrom.
9:
- The composite heating film of claim 1, wherein the metal/metal oxide composite particle has a higher atomic ratio of a metal ion compared to a metal (M0) having an oxidation number of 0.
10:
- A method of manufacturing a composite heating film, comprising:
- obtaining a conductive sheet dispersion solution in which a conductive sheet is dispersed in a dispersion medium;
- adding a metal oxide precursor to the conductive sheet dispersion solution;
- forming a film using the conductive sheet dispersion solution to which the metal oxide precursor is added;
- and
- reducing the film through thermal treatment to manufacture the composite heating film of claim 1.
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11:
- The method of claim 10, wherein the conductive sheet in the conductive sheet dispersion solution has a liquid crystal phase.
12:
- The method of claim 10, wherein the conductive sheet is a graphene oxide sheet.
13:
- The method of claim 10, wherein the metal oxide precursor is a metal salt including a metal cation and anion.
14:
- The method of claim 13, wherein a temperature of the thermal treatment is higher than a temperature at which the metal cation is reduced.
15:
- The method of claim 14, wherein the thermal treatment temperature ranges from 700 to 900° C.
16:
- The method of claim 10, wherein the formation of a film is performed by a filtration or coating method.
17:
- A heating element comprising:
- the composite heating film of claim 1;
- and
- a pair of electrodes electrically connected to the composite heating film.
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