47results about How to "Appropriate porosity" patented technology

A separation membrane according to the present invention ensures heat resistance and simultaneously has low resistance, appropriate air porosity and electrolyte retention. The separation membrane according to the present invention includes a porous substrate and a low-resistance coating layer formed on at least one surface of the porous substrate, wherein the low-resistance coating layer includes:a node (nodes) including inorganic particles and a polymer resin for coating at least a part of the surfaces of the inorganic particles; and filament(s) having a thread-like shape and coming out fromthe polymer resin of the nodes, wherein one or more filaments extends from one node, and the filaments are arranged to connect one node with another node.

The present invention provides an electrolyte holder for a lithium secondary battery capable of holding an electrolytic solution inside electrodes or at an interface between the separator and each of the electrodes, preventing electrolyte shortage inside the electrodes, and restraining dendrite from precipitating and growing and also provide the lithium secondary battery, using the electrolyte holder, which is capable of achieving a cycle life to such an extent that the lithium secondary battery can be used for industrial application. An electrolyte holder (3) for use in the lithium secondary battery consists of a multi-layer structure having at least two hydrophilic fibrous layers (A, B) having different porosities. The electrolyte holder (3) is composed of an electrode group formed by winding a cathode (2) and an anode (1) or laminating the cathode (2) and the anode (1) one upon another with an electrolyte holder (3) serving as a separator interposed between the cathode (2) and the anode (1). The organic electrolytic solution is permeated into the electrode group or the electrode group is immersed in the organic electrolytic solution. A porosity (40% to 80%) of the fibrous layer (A) disposed at an interface between the fibrous layer (A) and the anode (1) is set smaller than a porosity (60% to 90%) of the fibrous layer (B) disposed at an interface between the fibrous layer (B) and the cathode (2). An average porosity of the entire fibrous layer is set to not less than 50%. The fibrous layers are formed by using cellulose fibers as a main material thereof. An active substance for use in the anode (1) is a carbon material.

A method for preparing a tissue engineering scaffold material comprises: a) mixing biocompatible polyester and a non-polar solvent to obtain a first solution; b) adding a phase transformation solvent into the first solution to obtain a second solution; c) placing the second solution in a mold, removing the non-polar solvent and the phase transformation solvent through a liquid-vapor phase transformation process or / and a liquid-solid phase transformation process, and drying a solute to obtain the tissue engineering scaffold material. The tissue engineering scaffold material has good mechanical properties and high porosity.