53results about How to "Improve conductivity" patented technology

Disclosed is a nano-composite material comprising fully separated nano-scaled graphene platelets (NGPs) dispersed in a matrix material, wherein each of the platelets comprises a sheet of graphite plane or multiple sheets of graphite plane and has a thickness no greater than 100 nm and the platelets have an average length, width, or diameter no greater than 500 nm. The graphene plates are present in an amount no less than 15% by weight based on the total weight of the platelets and the matrix material combined. Typically, the nanocomposite is electrically conductive with a bulk conductivity no less than 10 S/cm and more typically no less than 100 S/cm. Highly conductive NGP nanocomposites are particularly useful for fuel cell flow field plate (bipolar plate) and battery electrode applications. Nanocomposites with high NGP proportions can be used in automotive friction plates and aircraft brake components.

The invention discloses an ink-jet-printing-technology-based preparation method of flexible wireless pressure detection system. The preparation method is characterized in that metal graphical processing of a flexible substrate surface is realized by ion exchange based on an all-wet chemical process; a flexible pressure sensor and a flexible antenna are prepared successively to realize signal transmitting and receiving; and then integration is carried out to form a flexible wireless pressure-sensitive sensor. Mechanical signals can be collected, transmitted and processed. During the metal graphical process, a common ink-jet printer can be used for printing with the low cost; and the obtained silver circuit is continuous and compact and the conductivity is high. The bonding force between a pressure sensing unit, the silver circuit, and the flexible substrate is strengthened; the pressure response frequency reaches 10000 hertz; and the pressure response range is from 10 pascal and 1 megapascal. During the flexible antenna signal collection and transmission, pressure response and transmission can be completed within 0.02 seconds. The flexible equipment has high stability; and the bending fatigue test demonstrates that the stability of the circuit characteristic of the system is kept after repeated 10000-times testing.

The invention provides a display panel and a preparation method thereof, and a display device. The display panel comprises a display area, a wire changing area and a bending area which are divided inthe horizontal direction; the display panel sequentially comprises a substrate, a barrier layer, a buffer layer, an active layer, a first gate insulation layer, a first metal layer and a second gate insulation layer from bottom to top, and further comprises a first through hole, a second metal layer, a first organic layer, a second metal layer, an interlayer insulation layer and a third metal layer, wherein part of the third metal layer located in the display area penetrates the interlayer insulating layer and is electrically connected to the second metal layer. The display panel has the technical effects that the bending performance of the display panel is improved, the circuit voltage drop is reduced, and the brightness uniformity of the display panel is improved.

The invention provides a graphene transparent conductive film and a preparation method thereof. Firstly, graphene oxide is modified and reduced so that modified and reduced graphene can be obtained, then the modified and reduced graphene is transferred to a substrate through polyurethane, the modified and reduced graphene is stably bonded to the substrate under the action of ultraviolet curing, polymer is removed through a thermal treatment method, and the graphene film can have good conductivity and transparency. According to the method for preparing the graphene transparent conductive film, no expensive experimental devices are needed, and the material utilizing rate is very high; the prepared graphene film is uniform and compact and good in uniformity. According to the graphene transparent conductive film and the preparation method thereof, cost can be easily reduced, raw materials are saved, the method is suitable for industrial production, and good market application prospects are achieved.

The invention discloses a preparation method of a double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains. The material is regulated and controlled and designed from the dual perspectives of crystal grain arrangement and secondary particle morphology, the double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains is prepared, and the material shows good comprehensive performance, especially excellent rate capability and cycling stability. The material is simple in preparation process, low in production cost, environmentally friendly, expected to realize industrial mass production and wide in application prospect.

The invention relates to an electrode for inhibiting shuttle flying of polysulfide ions in a lithium-sulfur battery and preparation and application thereof. According to the electrode, a composite metal-oxide composite coating capable of physically screening and chemically adsorbing polysulfide is deposited on a sulfur-carbon positive electrode material by applying a contact type chemical platingprocess, the current collecting effect of the electrode and the electron transmission efficiency in the electrode can be improved, the higher active substance utilization rate is achieved, the electrode polarization is reduced, the electrochemical capacity is improved, the shuttle flying effect of polysulfide can be well restrained, and the cycle life is prolonged. The sulfur-carbon electrode anda metal lithium negative electrode are assembled into a lithium-sulfur battery, so that the performance and the energy density of the battery can be greatly improved, and the sulfur-carbon electrode has huge potential of realizing industrial large-scale production in the future.

The embodiment of the invention provides low-temperature silver paste for an HIT solar cell and a preparation method of the low-temperature silver paste. The low-temperature silver paste comprises the following raw materials in percentage by mass: 35%-75% of a silver-containing conductive component, 0.5%-30% of resin, 1.8%-22% of an auxiliary agent, 5%-40% of an organic solvent and 0.1%-10% of a flux, wherein the flux is composed of silver salt, strong acid and a reducing solvent. According to the scheme, under the condition that the same conductivity is achieved, the usage amount of the silver-containing conductive component of the low-temperature silver paste is far smaller than that of the silver-containing conductive component in the prior art.

The invention discloses a preparation method of a lithium iron phosphate cathode material. The preparation method comprises the following steps: step one, weighing lithium carbonate, ammonium dihydrogen phosphate and ferrous oxalate respectively in a stoichiometric proportion of 1: 1: 1, adding absolute ethyl alcohol, uniformly mixing, carrying out ball-milling for 6 to 10 h at 350 to 450 rpm, then carrying out vacuum drying at the temperature of 60 to 100 DEG C for 10 to 20 h so as to obtain lithium iron phosphate precursor powder; step two, carrying out heat preservation for 4 to 6 h at the temperature of 350 to 450 DEG C in a pure nitrogen atmosphere protective tube furnace on the lithium iron phosphate precursor obtained in the step one, continuing temperature rise to 600 to 800 DEG C, calcining for 6 to 10 h, and naturally cooling to room temperature to obtain a lithium iron phosphate cathode material; and step three, weighing 1 wt% to 3 wt% of copper sheets with the mass being that of the lithium iron phosphate obtained in the step one and 4 wt% to 10 wt% of saccharose with the mass being that of the lithium iron phosphate obtained in the step one into the lithium iron phosphate material obtained in the step two, carrying out ball-milling for 1 to 3 h, washing with ethyl alcohol, centrifuging and drying, and calcining for 1 to 3 h at the temperature of 600 to 800 DEG C in a pure nitrogen atmosphere so as to obtain the lithium iron phosphate cathode material coated with copper and carbon together.

An organic electrolytic solution containing a lithium salt, an organic solvent, and an oxalate compound, and a lithium battery using the organic electrolytic solution are provided. Due to the oxalate compound, the organic electrolytic solution stabilizes lithium metal and improves the conductivity of lithium ions. Also, the organic electrolytic solution present invention improves charging/discharging efficiency when used in lithium batteries having a lithium metal anode. Especially when the organic electrolytic solution is used in lithium sulfur batteries, the oxalate compound forms a chelate with lithium ions and improves the ionic conductivity and the charging/discharging efficiency of the battery. In addition, due to the chelation of the lithium ions, negative sulfur ions remain free without interaction with lithium ions, are highly likely to dissolve in an electrolytic solution. As a result, a reversible capacity of sulfur is improved.

The invention discloses a Ti4O7-coated modified lithium titanate composite material and a preparation method thereof. A chemical formula of the Ti4O7-coated modified lithium titanate composite material is Li4Ti5O12/Ti4O7. According to the technical scheme, lithium titanate is modified by adopting Ti4O7 with good conductivity and corrosion resistance as a coating layer, and a layer of Ti4O7 film coats the surface of the lithium titanate, so that the conductivity of the lithium titanate is effectively improved, corrosion of an electrolyte to a lithium titanate material is inhibited, the rate capability and the cycle performance are significantly improved, the Ti4O7-coated modified lithium titanate composite material adapts to the requirements of a power lithium-ion battery, and furthermore, the technique is simple in operation process and suitable for industrial production.