Preparation and application of graphene quantum dot-embedded porous titanium dioxide material
A technology of graphene quantum dots and porous titanium dioxide, applied in nanotechnology for materials and surface science, secondary batteries, electrochemical generators, etc., can solve the limitations of large-scale applications, electronic conductivity and ion conductivity Low, the theoretical specific capacity is difficult to be fully utilized, etc., to achieve the effect of high specific capacity, high cycle stability, and shorten the transmission path
Inactive Publication Date: 2018-05-18
FUZHOU UNIV
View PDF4 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, titanium dioxide is a semiconductor material with low electronic conductivity and ionic conductivity, so its high theoretical specific capacity is difficult to be fully utilized, thus limiting its large-scale application.
At present, there are no patent reports on the use of graphene quantum dots embedded in hierarchical titania porous structures to improve the conductivity of materials
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0018] The preparation method of described graphene quantum dot embedding porous titania material is:
[0019] (1) After completely dissolving 0.1-1 g of 2-methylimidazole and 0.1-1 g of zinc nitrate in 10-40 mL of methanol solution, mix the two solutions and leave to age for 10-40 hours, then wash with methanol several times After drying at 70°C to obtain a white powder, further calcined at 400-1000°C for 2-8 hours to obtain a black powder (ZIF-8C);
[0020] (2) Add 0.1-1 gram of ZIF-8C to the PTFE lining containing 1-5 mL of nitric acid, react at 100-180°C for 2-8 hours, then use 20-800 mL of deionized water After washing, a graphene quantum dot (GQDs) solution is obtained.
[0021] (3) Add 1-10 mL of graphene quantum dot solution to 20-80 mL of 0.1-3 molar titanium tetrachloride solution, transfer to a 100 mL serum bottle after ultrasonication for 30 minutes, and store at 20-100°C Stir magnetically for 10-40 hours in the environment, and after natural cooling, the white p...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the technical field of nanomaterials for lithium-ion batteries and particularly relates to a preparation method and application of a graphene quantum dot-embedded porous titanium dioxide material. Graphene quantum dots are embedded into porous titanium dioxide in situ through a simple sol-gel method and are burnt in an inert atmosphere, and one part of tetravalent titaniumions are reduced into trivalent titanium ions, so that the conductivity of the material is improved and lithium intercalation sites of the material are increased. Meanwhile, a three-dimensional hierarchical structure is conducive to shortening a transmission path between lithium ions and electrons. The prepared titanium dioxide / graphene quantum dot composite material has very high specific capacity and cycling stability as a negative electrode material for the lithium-ion battery, the capacity can be stabilized at 168.5mAh / g when the current density is 5C (1C=168mAh / g), and the capacity can still reach 160.8mAh / g after 500 cycles even if being at high current density of 10C.
Description
technical field [0001] The invention belongs to the technical field of lithium-ion battery nanomaterials, and in particular relates to a preparation method and application of graphene quantum dots embedded in porous titanium dioxide materials. Background technique [0002] Titanium dioxide is widely used in solar energy conversion, catalysis and other fields due to its stable chemical structure, non-toxicity and low price. At the same time, it has a unique open crystal structure, which can provide channels for the intercalation / extraction of lithium ions, and is a class of electrode materials with important potential application value. However, titanium dioxide is a semiconductor material with low electronic conductivity and ionic conductivity, so its high theoretical specific capacity is difficult to be fully utilized, thus limiting its large-scale application. To solve this problem, common methods include constructing multi-dimensional nanostructure materials; composite m...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 魏明灯张伟峰
Owner FUZHOU UNIV