Hitachi Chemical Company, Ltd.

Shin-kobe Electric Machinery Co., Ltd.

Manabu Ochida

Kenji Nakai

Shingo Itoh

Tadashi Yoshiura

Takanori Kajimoto

Youhei Itoh

A lithium-ion battery with high safety is provided. A lithium-ion batteryincludes an electrode group, an electrolyte, and a battery containerthat contains the electrode groupand the electrolyte. The electrode groupis formed by stacking a positive electrode and a negative electrode via a separator. The positive electrode contains a composite oxide of lithium, nickel, manganese, and cobalt as a main positive active material. The negative electrode contains amorphous carbon as a main negative active material. The lithium-ion batteryhas a discharge capacity of 20 Ah or more. The ratio (the value of Y/X) of a volume Y occupied by the electrolyte to a volume X of a void space in the battery containeris 0.65 or more.

Lithium-ion battery

A non-aqueous liquid electrolyte secondary cell capable of preventing bursting or explosion thereof even when a current breaking device or a relief valve for pressure release fails in operation thereof due to any trouble or failure thereof. The cell includes a wound-up body formed by laminatedly spirally winding up a positive electrode and a negative electrode together while interposing a separator therebetween. The wound-up body thus formed is received in a cell can. The negative electrode is constructed by forming a negative active material layer containing amorphous carbon on each of both surfaces of a negative collector. The positive electrode is constructed by forming a positive active material layer containing LixCoO.sub.2 on each of both surfaces of a positive collector. The negative electrode is electrically connected to the cell can through a negative electrode lead. The positive electrode is electrically connected to the cell lid through a positive electrode lead joined to a connection plate of the cell lid by welding.

Non-aqueous liquid electrolyte secondary cell

Growing community of inventors

Tokyo, Japan

Manabu Ochida