Panasonic Intellectual Property Management Co., Ltd.

Panasonic Holdings Corporation

Panasonic Energy Co., Ltd.

Yuto Horiuchi

Takashi Yamamoto

Takahiro Fukuoka

Masaki Hasegawa

Taisuke Yamamoto

Masahiro Soga

Shimpei Yamagami

Shunsuke Nambuya

A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode material mixture including a negative electrode active material capable of electrochemically absorbing and desorbing lithium ions, a carbon nanotube; and an acrylic resin. The negative electrode active material includes a composite material including a silicate phase, and silicon particles dispersed in the silicate phase, and the silicate phase includes at least one selected from the group consisting of alkali metal elements and Group 2 elements.

Nonaqueous electrolyte secondary battery negative electrode and nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and an electrolyte liquid. The negative electrode includes a negative electrode mixture layer containing a first negative electrode active material and a negative electrode collector to which the negative electrode mixture layer is adhered. The first negative electrode active material contains a first lithium silicate phase containing lithium, silicon, and oxygen and first silicon particles dispersed in the first lithium silicate phase. An atomic ratio A:O/Si of the oxygen to the silicon in the first lithium silicate phase satisfies a relationship of 2<A≤3. At a surface side of the negative electrode, an existence ratio of the first negative electrode active material in the negative electrode mixture layer is high as compared to that at a negative electrode collector side of the negative electrode.

Non-aqueous electrolyte secondary battery

A method for charging a nonaqueous electrolyte secondary battery includes a first charging step of charging a first capacity Qat a first constant current value I, the first capacity Qincluding a capacity range in which dQ/dQ is more than or equal to a predetermined threshold value, a second charging step of charging a second capacity at a second constant current value more than the first constant current value, a detection step of acquiring at least one of dV/dQ and dQ/dQ, and a changing step of changing at least one of the timing of switching between the first charging step and the second charging step and the first constant current value Ion the basis of a change in time of dV/dQ or dQ/dQ.

Charging method for nonaqueous electrolyte secondary cell and charging system for nonaqueous electrolyte secondary cell

Growing community of inventors

Osaka, Japan

Yuto Horiuchi