摘要:
In order to enhance charge and discharge efficiency and to improve cycle characteristics by increasing a facing area between a positive electrode active material and a negative electrode active material, in a negative electrode for lithium secondary battery having a current collector and an active material layer carried on the current collector, the active material layer includes a plurality of columnar particles. The columnar particles include an element of silicon, and are tilted toward the normal direction of the current collector. Angle θ formed between the columnar particles and the normal direction of the current collector is preferably 10°≦θ
摘要:
An electrode plate for a battery includes a current collector having a substrate and a plurality of protrusions that are carried on the substrate; and an active material layer that is carried on the current collector. The protrusions include a conductive material that undergoes plastic deformation more easily than the substrate. A lithium secondary battery includes the above electrode plate.
摘要:
Disclosed is a non-aqueous electrolyte secondary battery including: a cylindrical wound electrode group including a belt-like negative electrode, a belt-like positive electrode, and a belt-like separator interposed therebetween, the electrodes and separator being laminated and wound together; and a non-aqueous electrolyte. The cross section perpendicular to the winding axis of the electrode group has a radius of 3 mm or more. The negative electrode includes a current collector, an active material layer including a silicon-based active material and adhering to the surface of the current collector, and a strip-like lead connected to the current collector via an alloy layer comprising a copper-silicon alloy. The lead is connected at the round of winding radially 3 mm or more away from the winding axis of the electrode group, and includes a copper foil or copper alloy foil having a tensile strength per unit length of the short side width thereof of 3 N/mm to 50 N/mm.
摘要翻译:公开了一种非水电解质二次电池,包括:包括带状负极,带状正电极和插入其间的带状隔板的圆柱形卷绕电极组,电极和隔板层压并卷绕在一起; 和非水电解质。 与电极组的卷绕轴垂直的截面的半径为3mm以上。 负极包括集电体,包含硅系活性物质的活性物质层,并附着在集电体的表面,以及通过合金层与集电体连接的条状引线,该合金层包含铜 - 硅合金 。 引线在距离电极组的卷绕轴线径向3mm以上的绕组的一圈上连接,并且包括其短边宽度的单位长度的拉伸强度为3N / cm 2的铜箔或铜合金箔, mm至50 N / mm。
摘要:
An electrode for a lithium secondary battery including a sheet-like current collector and an active material layer carried on the current collector. The active material layer is capable of absorbing and desorbing lithium, and the active material layer includes a plurality of columnar particles having at least one bend. An angle θ1 formed by a growth direction of the columnar particles from a bottom to a first bend of the columnar particles, and a direction normal to the current collector is preferably 10° or more and less than 90°. When θn+1 is an angle formed by a growth direction of the columnar particles from an n-th bend counted from a bottom of the columnar particles to an (n+1)-th bend, and the direction normal to the current collector, and n is an integer of 1 or more, θn+1 is preferably 0° or more and less than 90°.
摘要:
A negative electrode for a lithium ion secondary battery includes a current collector and a negative electrode active material layer supported on a surface of the current collector. The negative electrode active material layer includes a plurality of granular particles that include an alloyable active material. The granular particles are supported on a region of the current collector excluding a peripheral region that has a width of 20 μm to 500 μm from the edge thereof.
摘要:
A method for producing a negative electrode for a lithium ion battery includes the steps of: (1) preparing a negative electrode plate and a negative electrode lead, the negative electrode plate comprising a current collector and a thin-film negative electrode active material layer including an alloyable active material; (2) clamping the negative electrode plate and the negative electrode lead between a pair of welding jigs comprising a first plate and a second plate, in such a manner that a surface of the thin-film negative electrode active material layer and a surface of the negative electrode lead overlap and that a welding region including a welding end face is exposed; and (3) generating an arc discharge toward the welding region to melt the welding region. The welding jigs have, along the welding region, a shape which restricts expansion of the volume of the welding region due to the arc discharge.
摘要:
A current collector including a substrate, a plurality of projections, and a chipped portion is provided. The substrate is a metal sheet. The projections are formed on the surface of the substrate. The chipped portion is an aggregate of two or more, preferably 2 to 100 of minute projections. The minute projections are formed on the substrate surface, and are the protrusions having the height of below 35% of the average height of the projections. By forming an electrode active material layer on the face of the current collector where the projections are formed to make an electrode, the detachment of the electrode active material layer, and the spread of the detachment are significantly curbed. By using this electrode, a non-aqueous electrolyte secondary battery which have high battery capacity and energy density, excellent charge and discharge cycle characteristics, and which is capable of keeping a high-output stably for a long period of time can be obtained.