Sanyo Electric Co., Ltd.

Shiori Nakamizo

Satoshi Narukawa

Hiroshi Watanabe

Shin Fujitani

Masahisa Fujimoto

Maruo Kamino

Ryuji Ohshita

Daizo Jito

Noriyuki Tamura

Naoki Imachi

An electrode having a current collector and, formed thereon, a thin film comprising an active material, characterized in that a thin alloy film (such as Sn&#x2014;Co) comprising a metal which can form an alloy with lithium (such as Sn) and a metal which can not form an alloy with lithium (such as Co) is formed on a current collector such as a copper foil. It is preferred that the above metal which can form an alloy with lithium and the above metal which can not form an alloy with lithium can not form an intermetallic compound with each other.

Electrode for rechargeable lithium battery and rechargeable lithium battery

A lithium secondary battery-use electrode and a lithium secondary battery, which are high in discharge capacity and excellent in cycle characteristics, characterized in that a layer consisting of a metal alloying with Li is provided on a substrate consisting of a metal not alloying with Li, and a layer having these metals mixed therein is formed between the above layer and the substrate.

A lithium secondary battery comprises a negative electrode capable of intercalating/deintercalating lithium ion, a positive electrode made of a lithium-containing metal oxide as an active positive material, and a nonaqueous electrolyte, and a polyvinylidene fluoride resin is disposed between said negative electrode and positive electrode so that the battery voltage doesn't rise beyond a predetermined value even when said battery is overcharged.

Lithium secondary battery and battery device comprising same

The nonaqueous secondary battery according to the invention uses a separator which is a composite resin film with a reinforcing material layer integrally filled with polyvinylidene fluoride resin or a separator which is a composite resin film with a polyvinylidene fluoride resin layer and a reinforcing material layer stacked thereon. In this way, when the reinforcing material layer is integrally filled with the polyvinylidene fluoride (PVdF) resin , or the reinforcing material layer is stacked on the polyvinylidene fluoride (PVdF) resin layer , even if the polyvinylidene fluoride resin swells, its swelling is limited by the reinforcing material layer in the directions of width and length so that the separator or does not wrinkle.

Nonaqueous secondary battery

A nonaqueous secondary battery of the present invention comprises a polyvinylidene fluoride resin layer formed on either or both of the surface of the positive electrode and the negative electrode. This polyvinylidene fluoride resin layer exhibits excellent liquid retaining properties and thus can be formed on the surface of the electrodes to reduce the capacity drop during high temperature storage and hence improve the high temperature storage properties of the battery.

A positive electrode for a non-aqueous electrolyte cell containing spinel-type lithium manganese oxide as a main active material, wherein the positive electrode is comprised of a mixture of spinel-type lithium manganese oxide represented by a formula Li Mn O (provided that the atomic ratio of lithium and manganese is determined to be 0.56&lE;Li/Mn &lsqb;&equals;(1&plus;X)/(2&minus;Y)&rsqb;&lE;0.62, X is determined to be&minus;0.2&lE;X&lE;0.2, and Y is determined to be Y&lE;1.0) and at least either one of lithium cobalt oxide represented by a formula Li CoO (provided that Z is determined to be&minus;0.5&lE;Z&lE;0.5) or lithium nickel oxide represented by a formula Li NiO (provided that Z is determined to be&minus;0.5&lE;Z &lE;0.5), and wherein in the case that the weight of spinel-type manganese oxide is defined as A and that the weight of the lithium cobalt oxide or lithium nickel oxide is defined as B, the amount of lithium cobalt oxide or lithium nickel oxide is determined to be 0.5&lE;B/(A&plus;B)<0.2.

Growing community of inventors

Amagasaki, Japan

Shiori Nakamizo