Sony Corporation

Murata Manufacturing Co., Ltd.

Akira Takamuku

Kenichi Kawase

Takakazu Hirose

Yosuke Hosoya

Shinji Tanaka

Guohua Li

Takashi Fujinaga

Masaharu Senoue

Kazuaki Endoh

A lithium ion secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode contains a lithium composite oxide. The negative electrode contains a material including at least one of silicon Si and tin Sn as a constituent element. The lithium composite oxide includes lithium Li having a composition ratio a, a first element having a composition ratio b, and a second element having a composition ratio c as a constituent element. The first element including two kinds or more selected from among manganese Mn, nickel Ni, and cobalt Co, and including at least manganese. The second element including at least one kind selected from among aluminum Al, titanium Ti, magnesium Mg, and boron B. The composition ratios a to c satisfy the relationships of 1.1&#x3c;a&#x3c;1.3, 0.7&#x3c;b+c&#x3c;1.1, 0&#x3c;c&#x3c;0.1, and a&#x3e;b+c.

Lithium ion secondary battery, electric tool, electric vehicle, and power storage system

A lithium secondary battery includes a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode contains a positive electrode active material including element M2 incorporated in a crystal structure in a surface layer area of a complex oxide, the oxide including the element M1 and being represented by the following formula (1), M2 being different from M1. The element M2 is at least one kind selected from the group consisting of magnesium Mg, calcium Ca, titanium Ti, zirconium Zr, sulfur S, fluorine F, iron Fe, copper Cu, boron B, aluminum Al, phosphorus P, carbon C, manganese Mn, nickel Ni, and cobalt Co.Li(MnCoNi)M1O&#x2003;&#x2003;(1) M1 is at least one kind of aluminum, magnesium, zirconium, titanium, barium Ba, boron, silicon Si, and iron, a satisfies 0&#x3c;a&#x3c;0.25, b satisfies 0.5&#x2266;b&#x3c;0.7, c satisfies 0&#x2266;c&#x3c;1&#x2212;b, d satisfies 0.01&#x2266;d&#x2266;0.2, and e satisfies 0&#x2266;e&#x2266;1.

Lithium secondary battery, positive electrode active material, positive electrode, electric tool, electric vehicle, and power storage system

A rechargeable battery including: a positive electrode; a negative electrode including active material; and an electrolytic solution, in which the active material is capable of occluding and releasing lithium ions and includes Si and O as constituent elements, and an atomic ratio (Si/(Si+O)) of Si with respect to Si and O is 30 atomic % to 75 atomic % in a surface of the active material.

Active material for rechargeable battery, rechargeable battery, and electronic apparatus

Growing community of inventors

Fukushima, Japan

Akira Takamuku