Abstract:
PROBLEM TO BE SOLVED: To provide: a porous silicon-based electrode active material which can improve the initial efficiency and the capacity maintenance rate and reduce the thickness change rate to improve the lifetime; and a method of producing the same.SOLUTION: A porous silicon-based electrode active material comprises a silicon phase, a SiO(0
Abstract:
PROBLEM TO BE SOLVED: To provide an electrode active material for a secondary battery capable of preventing generation of cracks and pulverization through reducing volume changes in spite of containing the Si element, thereby improving lifetime characteristics and reducing the thickness change rate.SOLUTION: A porous electrode active material contains silicon-based oxide represented by SiO(0.5≤x≤1.2), and has a BET specific surface area of 2-100 m/g and a porosity of 5-90%. The surface of the porous electrode active material has pores in a honeycomb shape, and also the inside of the porous electrode active material has pores.
Abstract:
PROBLEM TO BE SOLVED: To provide: a silicon-based positive active material which can improve the initial charge/discharge efficiency in spite of using a silicon-based material as a positive active material of a secondary battery; and a method of manufacturing the same.SOLUTION: A silicon-based positive active material comprises a silicon phase, a SiO(0
Abstract:
PROBLEM TO BE SOLVED: To provide a method of producing a negative electrode active material for lithium secondary battery having a high capacity where the active material having a uniform particle size is dispersed well without being aggregated and excellent coulomb efficiency and cycle life characteristics are ensured, and to provide a lithium secondary battery.SOLUTION: The method of producing a negative electrode active material for lithium secondary battery includes a step for preparing a mixture of a silicon precursor, a surfactant containing ammonium halide salts having an organic group, an initiator, and a solvent, a step for heat-treating the mixture, a step for cooling and cleaning the resultant product of heat treatment at room temperature, and a step for burning the resultant product obtained by cleaning.
Abstract:
A perovskite compound according to the present invention contains an organic cation, a metal cation, and a non-metal anion, wherein a monovalent amidinium group cation and a divalent organic cation are contained as the organic cation. The perovskite compound according to the present invention has an excellent power conversion efficiency of more than 24% and has significantly improved stability with respect to heat and moisture itself.
Abstract:
The method for enhancing the performance of a transistor may be provided that includes forming a nano-wire on a substrate, applying strain to the nano-wire to bend the nano-wire, forming a source electrode, a drain electrode and a gate electrode, and manufacturing a transistor including the bent nano-wire formed by the applying of the strain, and source electrode, drain electrode and gate electrode formed by the forming of the electrodes. Through the above configuration, a silicon device that operates in a terahertz band can be more easily manufactured, and it is possible to evaluate whether or not the silicon device operates as a plasma-wave transistor.