152 results about "Interfacial resistance" patented technology

Thermal interface compositions contain both non-electrically conductive micron-sized fillers and electrically conductive nanoparticles blended with a polymer matrix. Such compositions increase the bulk thermal conductivity of the polymer composites as well as decrease thermal interfacial resistances that exist between thermal interface materials and the corresponding mating surfaces. Such compositions are electrically non-conductive. Formulations containing nanoparticles also show less phase separation of micron-sized particles than formulations without nanoparticles.

Thermal interface compositions contain nanoparticles blended with a polymer matrix. Such compositions increase the bulk thermal conductivity of the polymer composites as well as decrease thermal interfacial resistances that exist between thermal interface materials and the corresponding mating surfaces. Formulations containing nanoparticles also show less phase separation of micron-sized particles than formulations without nanoparticles.

The present invention provides a composite quasi-solid-state electrolyte, a composite quasi-solid-state electrolyte membrane, preparation methods of composite quasi-solid-state electrolyte and the composite quasi-solid-state electrolyte membrane, and a lithium battery or a lithium ion battery containing the composite quasi-solid-state electrolyte membrane. The composite quasi-solid-state electrolyte comprises a solid electrolyte, a lithium salt-containing liquid electrolyte, inorganic nanoparticles and a binder, wherein the static electricity or functional groups on the surface of the inorganic nanoparticles can adsorb the electrolyte so as to make the composite quasi-solid-state electrolyte have strong adsorption capacity and strong liquid retention ability, and the inorganic nanoparticles can adsorb the lithium salt so as to change the lithium ion conduction mechanism, reduce the interfacial resistance between the liquid electrolyte and the solid-state electrolyte, change the deposition morphology of lithium, hinder the formation of lithium dendrite, and reduce the pulverization of lithium. In addition, by adding the solid electrolyte, the composite quasi-solid-state electrolyteof the present invention can maintain the high conductivity and can effectively reduce the content of the liquid electrolyte so as to improve the safety of the battery.

The invention relates to a modified lithium-based composite negative material for a solid state battery and preparation and application of the material. The modified lithium-based composite negative material comprises 50-95 parts of lithium and 5-50 parts of a modified additive by weight; and the modified additive comprises one or multiple nitride or fluoride. The preparation method comprises thatthe lithium and modified additive are mixed, heated to 180-400 DEG C, stirred uniformly, and cooled to the room temperature; and the modified composite negative material is used to the solid state battery, and combined with a solid electrolyte. Compared with the prior art, the lithium metal is mixed with the modified additive by mixing in a heating fusing way, the surface energy of the lithium metal can be reduced effectively, elements including nitrogen and fluorine are introduced in a controllable way, the interfacial resistance between the solid electrolyte and lithium cathode is reduced effectively, the limit current that can be born by the solid electrolyte is increased, the recyclable charge and discharge capacity is improved, and the solid electrolyte and cathode interface is stable for a longer time in the long circulation process.

An electric double layer capacitor (EDLC) in a coin or button cell configuration having low equivalent series resistance (ESR). The capacitor comprises mesh or other porous metal that is attached via conducting adhesive to one or both the current collectors. The mesh is embedded into the surface of the adjacent electrode, thereby reducing the interfacial resistance between the electrode and the current collector, thus reducing the ESR of the capacitor.

The present invention provides a two-layer or multilayer polymer electrolyte comprising a laminated arrangement of a first electrolyte layer for contacting and electrochemically stabilizing a positiveelectrode and a second electrolyte layer for contacting and electrochemically stabilizing a negative electrode. In the two-layer polymer solid electrolyte provided by the invention, a high-voltage stable polymer electrolyte layer is in contact with a positive electrode, and a low-voltage stable polymer electrolyte layer is in contact with a negative electrode. At the same time, the stability conditions of the positive electrode and the negative electrode are satisfied, and a wide redox window is obtained. In addition, the flexibility of the polymer helps to reduce the interfacial resistance.The present invention provides a novel strategy for the design and optimization of solid polymer electrolyte materials, in which a high-voltage positive electrode and a low-voltage metal negative electrode coexist in a battery by utilizing a two-layer structure. This new solid-state electrolyte design will greatly accelerate the development and commercialization of solid-state secondary batteries.

The invention relates to a nickel-based multiple components cathode material and its preparation method, a chemical formula of the nickel-based multiple components cathode material is LiaNixCoyM1-x-yO2/(zLi3PO4(1-z)M')b; M in the chemical formula is one or more than two elements selected from Mn, Al, Zr, Ba, Sr and B, M' is one or more than two oxidate selected from Al, Zr, Ti, Mg and La, wherein 0.8<=a<=1.2, 0.7 <x<1, 0<y<1, x+y<1, 0<z<1, 0<b<0.05. The invention also provides a preparation method of the nickel-based multiple components cathode material. The nickel-based multiple components cathode material is characterized in that lithium phosphate and metal oxide are used for carrying out compound coating treatment on the surface, the interfacial resistance can be minimized, the conductivity performance of the surface lithium ion can be increased, the nickel-based multiple components cathode material can be protected, the generation of phase transformation of the nickel-based multiple components cathode material can be inhibited, simultaneously, the heating can be inhibited, the thermal stability can be enhanced, the capacity of the lithium ion secondary cell prepared by the product is high, and the security is good.

The invention discloses a preparation method of a layered lithium (Li)-rich manganese (Mn)-based anode material having multiple core-shell structures. The layered (1-t)LiNixCoyMn1-x-yO2@tLi2MnO3 having the multiple core-shell structures is prepared by taking LiNixCoyMn1-x-yO2 (the x is greater than or equal to 0 while the y is less than or equal to 1) as cores and Li2MnO3 with the concentration in gradient change as shells. According to the method, the core-shell structures are applied into the lithium (Li)-rich layered material, namely, the concept of the multiple core-shell structures is put forward, so that the defects reported in the literature that the simple core-shell structure material has poor performance and the concentration gradient material is complicated to operate and difficult to realize are overcome. In the method, the core-shell concentrations are in antigradient change according to a certain arithmetic progression, namely, from the cores to the outer shells, the concentrations of the core materials are in gradually-decreased arithmetic progression distribution while the concentrations of the shell material are in gradually-increased arithmetic progression distribution. During the design, the equal concentration of transition metal ions in every layer is ensured, so that the interfacial resistance of the materials is reduced as far as possible. As a result, the material performance is improved.

An electrolyte for an electrochemical storage device is disclosed. In one embodiment, the electrolyte includes a lithium salt from about 3% to about 20% by weight, a primary solvent from about 15% to about 25% by weight, wide-temperature co-solvents from about 14% to about 55% by weight, interface forming compounds from about 0.5% to about 2.0% by weight, and a flame retardant compound from about 6% to about 60% by weight. The electrolyte interacts with the positive and negative electrodes of the electrochemical storage device to provide both high performance and improved safety such that the electrolyte offers adequate ionic conductivity over the desired operating temperature range, a wide electrochemical stability window, high capacities for both the cathode and anode, low electrode-electrolyte interfacial resistance, and reduced flammability.

The invention provides a preparation method of an ultrathin 2D WO3/g-C3N4 type-Z heterojunction photocatalyst. The preparation method of the ultrathin 2D WO3/g-C3N4 type-Z heterojunction photocatalystcomprises the following steps of S1, preparing ultrathin 2D WO3 nanosheets; S2, preparing ultrathin 2D g-C3N4 nanosheets; S3, preparing the ultrathin 2D WO3/g-C3N4 type-Z heterojunction photocatalystthrough the ultrathin 2D WO3 nanosheets and the ultrathin 2D g-C3N4 nanosheets. The invention also provides the ultrathin 2D WO3/g-C3N4 type-Z heterojunction photocatalyst. The ultrathin 2D WO3/g-C3N4 type-Z heterojunction photocatalyst is composed of 2D WO3 and 2D g-C3N4 at a weight ratio of 1-3:10. The type-Z energy band structure of the ultrathin 2D WO3/g-C3N4 type-Z heterojunction photocatalyst improves the photocatalytic efficiency; meanwhile, face-to-fact contacted 2D/2D heterojunction can present a large interfacial contact area and a smaller interfacial resistance, thereby improving the charge transfer efficiency and further improving the photocatalytic performance and stability.

The invention provides a general type of porous coordination solids, metal-organic frameworks (MOFs), as an electrode additive to improve thermal stability, rate and cycle performances of batteries, and an electrode having the electrode additive. The incorporation of the MOF additive into the electrode is fully compatible with current battery manufacturing process. Activated MOF additive serves as an electrolyte modulator to enhance cationic transport and alleviates interfacial resistance by interacting liquid electrolyte with unsaturated open metal sites. Moreover, the flow-free liquid in solid configuration is realized by encapsulating liquid electrolyte into porous scaffold of MOF, which offers superior thermal stability.

Disclosed is an electrode having a novel configuration for improving performance of the electrode used in solid-oxide fuel cells, sensors and solid state devices, in which the electrode providing electron conductivity is coated with ion conductive ceramic ceria film, enabling an electron conductive path and an ion conductive path to be independently and continuously maintained, and additionally extending a triple phase boundary where electrode/electrolyte/gas are in contact, and a method for manufacturing the same. The electrode is manufactured by coating the prefabricated electrode for use in a SOFC or sensor with a porous oxygen ion conductive ceramic ceria film by a sol-gel method, whereby the electron conductive material and ion conductive material exist independently, having a new microstructure configuration with a greatly extended triple phase boundary, thus improving electrode performance. Accordingly, such electrode does not require high cost equipment or starting materials, owing to the sol-gel method by which low temperature processes are possible. Moreover, the electrode microstructure can be controlled in an easy manner, realizing economic benefits, and the electrode/electrolyte interfacial resistance and electrode resistance can be effectively decreased, thereby improving performance of electrodes used in SOFCs, sensors and solid state devices.

The invention relates to measuring method of the oxyanion hyphen electron mixed conductor material ionic conductivity. The mixed conductor is a ceramic material which has oxyanion and electron conduction power. The characteristics of measuring method is that it calculates and gets the ionic conductivity resulting the changes of resistance with the change of needed detection mixed conductor sample geometry after the electron block; because the tangent condition has not any changed before and after of mixed conductor block electrode, not considering the interfacial resistance, block electrode resistance and Pt electrode resistance, avoiding the error from this. The calculating formula of mixed conductor ionic conductivity is sigma i= (L1-L2)/[S*(R-R')].The measuring method of this invention is simply and convenience, the structure of measuring battery is simplify, reducing the factors of importing error.

The invention relates to a preparation method of three-dimensional porous graphene, which comprises the following steps: preparing a graphene oxide water solution through a modified Hummers method; mixing the graphene oxide water solution and toluene-soluble asphalt, performing hydrothermal reaction at 160-240 DEG C for 8-15 hours, cooling, washing, and drying; and under the protection of inert gas, performing heat treatment on the dried sample at 900-1100 DEG C for 0.5-3 hours, and cooling to obtain the cylindrical solid three-dimensional porous graphene. The preparation method of the graphene material having a porous structure has the advantages that the process is simple, the course is easy to control, the interfacial resistance of the graphene is greatly reduced, and the conductivity of the material is excellent.

The invention relates to a method of modifying the interfacial resistance of a lithium metal electrode immersed in an electrolytic solution, which consists in depositing a film of metal oxide particles on the surface of this electrode.

The invention also relates to a lithium metal electrode, the surface of which is covered with a film of metal oxide particles, and to a battery of the lithium metal type.

A method of manufacturing a contact plug in a semiconductor device is disclosed. In-situ thermal doping of an impurity such as phosphorous (P) during the process by which polysilicon for a contact plug is formed by selective growth method and after in-situ doping after the growth process is employed in order to increase the concentration of the impurity in the contact plug. As a result, the disclosed method can reduce the interfacial resistance at the plug to improve the electrical characteristics of a device of more than 1G bits.

A separator for a lithium ion secondary battery, comprising a porous base material containing polyolefin, and a porous layer containing a vinylidene fluoride resin as a main component provided on at least one surface of the porous base material is excellent in electrolytic solution retention properties, adhesion and bondability to electrodes, and dimensional stability, and also has high and uniform ionic conductivity, reduced interfacial resistance to electrodes, and shutdown properties. A lithium ion secondary battery having excellent capacity characteristics, charge and discharge characteristics, cycle characteristics, safety and reliability can be provided by using the separator.