57results about How to "Improve interface resistance" patented technology

Disclosed is a positive electrode body for a nonaqueous electrolyte battery, which suppresses increase in interface resistance by suppressing the formation of a high resistance layer at the contact interface between a positive electrode active material particle and a solid electrolyte particle. Specifically disclosed is a positive electrode body (1) for a nonaqueous electrolyte battery, wherein coated positive electrode active material particles (10), each of which is obtained by covering the surface of a positive electrode active material particle (10a) with a coating layer (10b) that has Li ion conductivity, and sulfide solid electrolyte particles (11) are mixed. The coating layer (10b) is formed from an amorphous oxide having oxygen deficiency. By having oxygen deficiency in the coating layer (10b), Li ion conductivity and electron conductivity sufficient for charge and discharge of a battery can be stably secured in the coating layer (10b).

The present disclosure relates to a lithium secondary battery. More specifically, the lithium secondary battery of the present disclosure includes a cathode, an anode, a separator interposed between the cathode and the anode, and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution includes an ionizable lithium salt and an organic solution, and includes, based on 100 parts by weight of the non-aqueous electrolyte solution, (a) 1 part by weight to 10 parts by weight of a compound containing a vinylene group or vinyl group, and (b) 0.1 parts by weight to 10 parts by weight of a dinitrile-based ether compound of a particular structure, and the cathode includes a cathode active material including a mixture of a first cathode active material Li x CoO 2 (0.5<x<1.3) and a second cathode active material Li x M y O 2 (M is Ni 1-a-b Mn a Co b (0.05‰¤a‰¤0.4, 0.1‰¤b‰¤0.4, 0.4‰¤1-a-b‰¤0.7) in which x+y=2 and 0.95‰¤x‰¤1.05. The lithium secondary battery of the present disclosure has a high capacity, and remarkably suppresses a swelling phenomenon at high temperature of the battery.

The present invention provides: a Nb3Sn superconducting wire rod that is produced by the internal tin process and that has a number of useful functions in such aspects as promotion of Nb3Sn layer generation, mechanical strength (and increase in interfacial resistance) of superconducting filaments, critical temperature (magnetic field), miniaturization of crystal grains, etc.; and a production method therefor. The Nb3Sn superconducting wire rod production method according to one embodiment of the present invention comprises: a step for providing a rod material 10 which has an alloy compositionrepresented by Cu-xZn-yM (where, x is 0.1-40 mass%; M=Ge, Ga, Mg or Al, provided that x is 0-40 mass% for Mg), and a central part of which is provided with a Sn insertion hole 12, and which has a plurality of Nb insertion holes 14 that are discretely disposed along the outer peripheral surface of the Sn insertion hole 12; a step for installing an alloy bar having an alloy composition of Sn-zQ (Q=Ti, Zr, Hf) in the Sn insertion hole 12, and inserting a Nb core in the Nb insertion holes 14; a step for reducing the diameter of the rod material 10 so as to prepare a Cu-xZn-yM / Nb / Sn-zQ composite multicore wire having a prescribed outer diameter; and a step for subjecting the composite multicore wire to a heat treatment for generating a Nb3Sn phase.

The present invention relates to a separator for a lithium secondary battery and a lithium secondary battery comprising the same, the separator comprising: a porous polymer substrate; and a porous coating layer positioned on at least one surface of the porous polymer substrate and including inorganic particles and a binder polymer, in which the binder polymer includes a PVdF-based binder polymer, and in X-ray diffraction (XRD) analysis, the inorganic particles have a specific surface area, and the specific surface area is at least one surface area. The PVdF-based binder polymer has a first peak at a 2 [theta] of 18.2 + / -0.2 DEG, a second peak at a 2 [theta] of 19.8 + / -0.2 DEG, and a ratio of a second peak area to a first peak area (second peak area / first peak area) is between 1.25 (inclusive) and 2.75 (exclusive). The separator for a lithium secondary battery according to the present invention has fine and uniform pores formed on the surface thereof to increase the adhesion surface area of a counter electrode, and as a result, the adhesion strength of the counter electrode is enhanced.

The present invention relates to a coating composition, comprising a solvent, inorganic particles, a dispersant, and a binder, for coating at least one surface of a porous substrate having a plurality of pores. The binder comprises binder B and binder A, wherein the binder B and the binder A both contain a vinylidene fluoride (VDF)-derived unit and a hexafluoropropylene (HFP)-derived unit. The HFP-derived unit accounts for 8% to 50% by weight of the binder B, and in the binder A, the HFP-derived unit is not more than 80% of the proportion thereof in the binder B and is not less than 5% by weight of the binder A. The total number average molecular weight of the binder B is 200,000 to 2,000,000, and the total number average molecular weight of the binder A is 70% or less of that of the binder B. The weight ratio of binder A: binder B in the total coating composition is 0.1 to 10: 1. The present invention has resolved the problem that when a binder is thinned from 4 to 3 , the binder is dried before being sufficiently phase-separated and thus a sufficient electrode adhesive force cannot be obtained, and also in terms of a manufacturing method, the present invention has provided a coating composition in which sufficient phase separation occurs even in a low-humidity condition.