Gs Yuasa International Ltd.

Katsushi Nishie

Yudai Kawasoe

Tomonori Kako

Sumio Mori

Shinya Kitano

Toru Tabuchi

Hidefumi Hasegawa

Takeshi Hachida

Toshiyuki Aoki

Minoru Teshima

A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. A positive electrode charge potential is 3.7 V or less with respect to a lithium metal potential. The nonaqueous electrolyte includes a cyclic disulfone compound having a specific structure in an amount of 0.1 to 4.0% by mass based on a total mass of the nonaqueous electrolyte.

Nonaqueous electrolyte secondary battery and method for producing nonaqueous electrolyte secondary battery

An object of the present invention is to provide a nonaqueous electrolyte secondary battery including a monofluorotoluene-containing nonaqueous electrolyte with an improved overcharge-preventing effect. In a monofluorotoluene-containing nonaqueous electrolyte, when a specific fluorophosphate compound is contained, the overcharge-preventing effect of the monofluorotoluene can be improved. As a result, in the overcharged state of a nonaqueous electrolyte secondary battery including the monofluorotoluene-containing nonaqueous electrolyte, an increase in the battery surface temperature can be suppressed.

Nonaqueous electrolyte secondary battery

The present invention provides a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode having a negative active material, and a non-aqueous electrolyte, characterized in that the negative active material contains composite particle (C), which has silicon-containing particle (A) and electronic conductive additive (B), the silicon-containing particle (A) has a content of carbon, and when measured at a temperature rising rate of 10&#xb1;2&#xb0; C./min by thermogravimetry, said composite particle (C) exhibits two stages of weight loss in the range of 30 to 1000&#xb0; C.

Non-aqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery including a positive electrode having a positive active material, and an electrolyte, wherein a positive electrode potential at the time of charging is 3.7 V or less with respect to a lithium metal potential, and the electrolyte contains a cyclic sulfate compound having a specific structure.

Provided is an electric storage device including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein an inorganic filler layer is disposed between the positive electrode and the negative electrode and the nonaqueous electrolyte solution contains lithium difluorobis(oxalato)phosphate.

Electric storage device

A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode includes LiMnNiCoMO(0&#x3c;x&#x3c;1.3, 0.1&#x3c;a&#x3c;0.7, 0.1&#x3c;b&#x3c;0.6, 0.1&#x3c;c&#x3c;0.67, 0&#x2266;d&#x3c;0.1, a+b+c+d=1, and M represents a metal selected from the group consisting of Al, Ti, Mg, Cr, Zn, W, Zr and Nb) as a positive active material. The nonaqueous electrolyte includes a cyclic disulfone compound of the general formula (1) in an amount of 0.1 to 4.0% by mass based on the total mass of the nonaqueous electrolyte.

A non-aqueous electrolyte secondary battery includes a positive electrode containing a positive-electrode active material, a negative electrode containing a negative-electrode active material, and a non-aqueous electrolyte, and is characterized in that the non-aqueous electrolyte contains 1.0 wt % or less of a compound represented by formula (1) and 2.0 wt % or less of a cyclic sulfate ester represented by formula (2), based on the total weight of the non-aqueous electrolyte. By using the non-aqueous electrolyte including a specified amount of the compound represented by formula (1) and a specified amount of the cyclic sulfate ester, when the battery is used at a low temperature after being stored at a high temperature, the increase of the internal resistance is inhibited.

Non-aqueous electrolyte secondary battery, and method for fabricating non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery is described, capable of inhibiting the raise of the internal resistance at a low temperature after use in a high-temperature circumstance, and having a good power performance at a low temperature. The non-aqueous electrolyte secondary battery has a non-aqueous electrolyte, and is characterized in containing a sulfate ester with a specific structure in an amount of 4.0 wt % or less relative to the total weight of the non-aqueous electrolyte.

Non-aqueous electrolyte secondary battery, non-aqueous electrolyte, and method for fabricating non-aqueous electrolyte secondary battery

The present invention provides a non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode having a negative active material, and a non-aqueous electrolyte; characterized in that said negative active material contains composite particle (C), which has silicon-containing particle (A) and electronic conductive additive (B), and carbon material (D), wherein the weight of said electronic conductive additive (B) falls within the range of 0.5 wt. % to 60 wt. % to the weight of said composite particle (C). The negative active material contains silicon which is capable of performing high discharge capacity, so that a non-aqueous electrolyte secondary battery having a large discharge capacity can be obtained. In addition, since the negative active material contains the electronic conductive additive (B) and the carbon material (D), the contact conductivity between the silicon-containing particle (A) or between the negative active material improves and, as a result, a non-aqueous electrolyte secondary battery having satisfactory cycle performance can be attained.

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Kyoto, Japan

Katsushi Nishie