Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Other

Mitsubishi Chemical Corporation

Takafumi Oura

Kazuya Iwamoto

Atsushi Ueda

Hizuru Koshina

Shinji Nakanishi

Hiroshi Yoshizawa

Takaharu Morikawa

Masaki Kitagawa

Kaoru Inoue

Kensuke Nakura

Shinichi Kinoshita

Yusuke Fukumoto

Minoru Kotato

Hajime Nishino

Fumio Kato

Shozo Fujiwara

Masaki Deguchi

Kazuhiro Okamura

Masao Fukunaga

Shuji Tsutsumi

Hitoshi Matsumoto

Mitsuhiro Takeno

Kumiko Sonoda

Toshihiro Inoue

Norihiro Yamamoto

Hideharu Satou

Makino Hatazaki

A non-aqueous electrolyte secondary battery wherein the non-aqueous electrolyte contains a non-aqueous solvent, a solute dissolved in the non-aqueous solvent, and hydrogenated terphenyl, the solute includes a boron-containing alkali salt and a boron-free alkali salt, the negative electrode includes a negative electrode active material comprising a randomly oriented carbon composite (A), and the carbon composite (A) contains a graphitic carbon substance (B) and a carbon substance (C) that is different from the graphitic carbon substance (B).

Non-aqueous electrolyte secondary battery

One aspect of the present invention pertains to a method for producing a negative electrode for a non-aqueous electrolyte secondary battery, which comprises a paste preparing step of kneading a mixture containing a negative electrode active material, a binder resin having a glass transition temperature within a range from 20 to 40&#xb0; C. and a dispersion solvent to prepare a negative electrode material mixture paste, a paste applying step of applying the negative electrode material mixture paste controlled to a temperature which is at least 10&#xb0; C. higher than the glass transition temperature of the binder resin on a current collector to form a coating film, a coating film drying step of drying the coating film to form a negative electrode precursor, and a rolling step of rolling the negative electrode precursor to prepare a negative electrode having a negative electrode material mixture layer.

Method for producing negative electrode for non-aqueous electrolyte secondary battery, and negative electrode for non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery comprises a negative electrode including a negative electrode active material, a positive electrode including a positive electrode active material, and a non-aqueous electrolyte; the positive electrode active material is LiNiMnCoO, wherein y and z satisfy 0&#x3c;y&#x2266;0.5, 0&#x2266;z&#x2266;0.5, and 0&#x3c;y+z&#x2266;0.75; and an upper limit voltage for charging the non-aqueous electrolyte secondary battery is 4.25 to 4.70 V. It is possible to obtain a non-aqueous electrolyte secondary with high capacity, high reliability, and long life by properly setting the composition of a composite oxide of lithium which is a positive electrode active material and the charging conditions of the battery using this composite oxide of lithium as a positive electrode active material as described above.

Non-aqueous electrolyte secondary battery and method for charging the same

The present invention provides a lithium rechargeable battery including a negative electrode comprising a copper core material, to which is fixed an active material made by mixing artificial graphite particles A obtained by kneading and granulating a base material of pulverized bulk mesophase pitch with pitch in a softened state and/or thermosetting resin, carbonizing the resulting granules at 700 to 1,500&#xb0; C. and graphitizing the carbonized granules at 2,500 to 3,000&#xb0; C. with spherical graphite particles B having a high mean circularity, with a view to inhibiting the deterioration in battery capacity through the repeated charge/discharge cycles, which occurs remarkably in a high energy density lithium rechargeable battery, and providing excellent discharge characteristic and safety.

Lithium rechargeable battery

In an electrolyte of a non-aqueous electrolyte secondary battery using a cyclic carboxylic-acid ester exerting high conductivity under a low temperature condition, for suppressing reductive decomposition of the cyclic carboxylic acid ester, a cyclic carbonic acid ester having at least one carbon-carbon unsaturated bond is contained, and for suppressing excessive polymerization reaction of the cyclic carbonic acid ester having at least one carbon-carbon unsaturated bond, a cyclic carbonic acid ester having no carbon-carbon unsaturated bond is further contained.

The invention relates to a non-aqueous electrochemical apparatus in which the difference (&#x3b3;l&#x2212;&#x3b3;se) between the surface tension &#x3b3;l of non-aqueous electrolyte and the surface free energy &#x3b3;se of electrode is not more than 10 dynes/cm.

Non-aqueous electrochemical apparatus

A polymeric solid electrolyte capable of conducting lithium ions which contains silylamide bonds in its polymer skeleton structure, for example, which is obtained by a method comprising subjecting a mixture of lithium silylamide and an organic compound having at least one carbon&mdash;carbon double bond to a polymerization in a dry atmosphere; and a lithium secondary cell using the polymeric solid electrolyte. The polymeric solid electrolyte is a &ldquo;dry&rdquo; polymeric solid electrolyte which contains counter ions forming lithium salts with lithium ions in its polymer skeleton structure and thus has a single ion electron conducting system wherein lithium ions alone are mobile ions, and hence has excellent conductivity, and further is easy to produce. The polymeric solid electrolyte can therefore be used for producing a novel lithium secondary cell which is an alternative for conventional lithium cells using an organic solvent and is safe and excellent in the capability of corresponding to a variety of shapes and has a high cell voltage.

Polymeric solid electrolyte and lithium secondary cell using the same

In a non-aqueous electrolyte secondary battery, a cyclic carboxylic acid ester having a high conductivity in a low-temperature environment is used as an electrolyte, and, furthermore, a cyclic carbonic acid ester having at least one carbon-carbon unsaturated bond is added thereto for the inhibition of reductive decomposition of the cyclic carboxylic acid ester.

Nonaqueous electrolyte secondary cell

Nonaqueous electrolyte secondary battery with a polyolefin microporous membrane separator

A lithium secondary cell comprising a safe aqueous-solution electrolyte free from danger of firing and explosion and capable of supplying a high voltage of more than 3 V. The cell includes a positive plate having an active material absorbing/desorbing lithium ions and exhibiting a high voltage, a negative plate having an active material exhibiting a low voltage, a polymer solid electrolyte having a lithium-ionic conductivity, and an aqueous-solution electrolyte. The positive and negative plates are coated with a polymer solid electrolyte having an ionic conductivity and therefore isolated from the aqueous-solution electrolyte by the plate coating layers.

Lithium secondary cell

The present invention relates to an electrolyte for non-aqueous electrochemical device containing at least one of 6-substituted-1,3,5-triazine-2,4-dithiol and derivatives thereof as an additive and a non-aqueous electrochemical device, particularly a lithium secondary battery by the use thereof. The additive of the present invention forms a stable and low resistance film on the positive electrode, inhibiting characteristics of the electrochemical device from deteriorating on account of gas generated due to the decomposition of electrolyte.

Non-aqueous electrochemical device

For providing a non-aqueous electrolyte secondary battery having excellent storage characteristics when stored in the charged state under a high temperature condition, the non-aqueous electrolyte or the negative electrode is made to contain divinylethylene carbonate, thereby to form a film derived from divinylethylene carbonate on the surface of the negative electrode material.

Growing community of inventors

Osaka, Japan

Takafumi Oura