Abstract: This negative electrode for a lithium ion secondary battery is characterized by comprising a negative electrode mixture layer containing a carbon-based negative electrode active material, a Si-based negative electrode active material, and carbon nanotubes, wherein when 100 is the ratio at which the carbon nanotubes coat the surface of the Si-based negative electrode active material, the ratio at which the carbon nanotubes coat the surface of the carbon-based negative electrode active material is at least 20 but no higher than 50.

Abstract: Provided is a carbon nanotube dispersion liquid for an electrode slurry such that it is possible to inhibit a decrease in a charge-discharge cycle characteristic. A carbon nanotube dispersion liquid for an electrode slurry according to one aspect of the present disclosure includes carbon nanotubes having a diameter of 0.4 to 2 nm, a dispersant, and a dispersion medium. In a Raman spectroscopy spectrum, the carbon nanotubes have a G/D ratio, which is the ratio of the peak intensities of the G-band (1560 to 1600 cm?1) and the D-band (1310 to 1350 cm?1), within the range of 50 to 200, and in a volume-based particle size distribution via a laser diffraction method, the carbon nanotubes have 3 to 5 peaks, and if the peaks are, from the small particle diameter side, P1, P2, . . . , Pn, the greatest frequency peak is in the range pf P2 to Pn-1.

Abstract: An injection piston can be driven along an axial direction of a heating barrel. The injection piston is connected to a screw and drives the screw along the axial direction. An injection hydraulic cylinder drives the injection piston in the axial direction by pressure of hydraulic oil. Inside of the injection hydraulic cylinder being partitioned into a first chamber and a second chamber. An oil discharge port is provided in the injection hydraulic cylinder and discharges the hydraulic oil from the second chamber. A first valve is inserted in a path for discharging the hydraulic oil discharged from the second chamber. A second valve opens when the pressure of the provided oil is higher than a first threshold value. The first valve closes when the pressure of the hydraulic oil supplied through the second valve is applied to the first valve.

Abstract: An injection piston can be driven along an axial direction of a heating barrel. The injection piston is connected to a screw and drives the screw along the axial direction. An injection hydraulic cylinder drives the injection piston in the axial direction by pressure of hydraulic oil. Inside of the injection hydraulic cylinder being partitioned into a first chamber and a second chamber. An oil discharge port is provided in the injection hydraulic cylinder and discharges the hydraulic oil from the second chamber. A first valve is inserted in a path for discharging the hydraulic oil discharged from the second chamber. A second valve opens when the pressure of the provided oil is higher than a first threshold value. The first valve closes when the pressure of the hydraulic oil supplied through the second valve is applied to the first valve.