A high capacity lithium secondary battery with excellent safety is provided by suppressing expansion of a negative electrode active material during charge and increasing the content of a heat-resistant resin in a separator relative to conventional one. The lithium secondary battery includes: a negative electrode active material that comprises compound particles containing at least one metal element selected from the group consisting of Si, Sn, Al, and Zn; and a separator that has a first porous layer comprising polyolefin and a second porous layer comprising a heat-resistant resin. The separator contains 10 to 60 parts by weight of the second porous layer per 100 parts by weight of the first porous layer.

Lithium Secondary Battery

A subject for the invention is to improve the cycle characteristics of a high-capacity secondary battery containing an active material packed at a high density, by using a particulate active material having a low aspect ratio. The invention relates to a nonaqueous-electrolyte secondary battery comprising a negative electrode and a positive electrode each capable of occluding/releasing lithium, a separator, and a nonaqueous electrolyte solution comprising a nonaqueous solvent and a lithium salt, characterized in that the separator comprises a porous film made of a thermoplastic resin containing an inorganic filler, and at least either of the following is satisfied: the active material contained in the negative electrode is a particulate active material having an aspect ratio of from 1.02 to 3; and the active material contained in the positive electrode is a particulate active material having an aspect ratio of from 1.02 to 2.2.

Nonaqueous electrolyte secondary battery

The present invention relates to a nonaqueous electrolyte solution comprising a lithium salt and a nonaqueous organic solvent, wherein the nonaqueous electrolyte solution comprises a specific sulfonic acid ester

Nonaqueous electrolyte solution and nonaqueous electrolyte battery using same

Disclosed is an electrolyte for a rechargeable lithium battery that includes a lithium salt, a phosphine compound having at least one trialkylsilyl group and organic solvent, and a rechargeable lithium battery including the electrolyte. The phosphine compound may be tris(trialkylsilyl)phosphine wherein the alkyl groups are the same or different and are each independently selected from C1 to C6 alkyl.

Electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

Disclosed are a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, which contains a sulfonate compound having a specific structure in an amount of from 0.01 to 10% by mass of the nonaqueous electrolytic solution, and an electrochemical device containing the nonaqueous electrolytic solution. The nonaqueous electrolytic solution is excellent in the effect of improving the storage property of primary batteries and improving the cycle property of secondary batteries in use thereof at high temperatures and the low-temperature property thereof after high-temperature cycles.

Nonaqueous electrolyte solution and electrochemical element using same

There are provided a nonaqueous-type electrolyte solution having high flame retardancy and a good capacity retention rate, and a device comprising the nonaqueous-type electrolyte solution The nonaqueous-type electrolyte solution is used in a device comprising a positive electrode, a negative electrode and the nonaqueous-type electrolyte solution, and contains a lithium salt and a compound having a Phosphazene structure, and further contains 005% by mass or more and 120% by mass or less of at least one disulfonate ester selected from a cyclic disulfonate ester and a chain disulfonate ester based on the total of the nonaqueous-type electrolyte solution

Nonaqueous electrolyte solution and device comprising same

A non-aqueous electrolyte can suppress decomposition of a solvent, improve the cycle life of a secondary battery, suppress the rise of resistance of a secondary battery and improve the capacity maintenance ratio of a secondary battery. A non-aqueous electrolyte secondary battery formed by using such a non-aqueous electrolyte includes a non-aqueous electrolyte containing an aprotic solvent and a disulfonic acid ester as expressed by chemical formula 1 shown below, a positive electrode and a negative electrode:

Non-aqueous electrolyte and non-aqueous electrolyte secondary battery using the same

There is provided a lithium ion battery which maintains the flame retardancy of an electrolyte over a long period of time, has high energy density, and has improved charge/discharge cycle characteristics, high temperature storage characteristics, and rate characteristics. The lithium ion battery according to the present exemplary embodiment is a lithium ion battery comprising an electrolyte containing at least an ionic liquid and a lithium salt, a positive electrode, and a negative electrode, wherein the negative electrode includes a negative electrode active material which is a carbon material treated with a surface treatment agent.

Lithium ion cell

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte for improving the cycle service life of the nonaqueous electrolyte secondary battery, suppressing the rise in resistance and improving the maintenance ratio for capacity; and to provide a nonaqueous electrolyte secondary battery. SOLUTION: The nonaqueous electrolyte and the nonaqueous electrolyte secondary battery using the same are characterized by containing aprotic solvent and sulfonate indicated by general formulas (1): X 1 -R 1 -X 2 or (2): X 3 -R 2 -X 4 -R 3 -X 5 . X 1 to X 5 are each independently an disulfonic acid compound indicated by a general formula (3) in the general formulas (1), (2). A 1 and A 2 are each independently a 1-5C alkylene group substituted or not-substituted in the general formula (3). Connecting portions between R 1 to R 3 are A 1 or A 2 . Q 1 are each independently oxygen atom, methylene group or single bonds. COPYRIGHT: (C)2010,JPO&INPIT

Nonaqueous electrolyte and nonaqueous electrolyte secondary battery using the same

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolytic solution which suppresses degradation of a solvent of an electrolytic solution, improves cycle life of the nonaqueous electrolyte secondary battery, suppresses heightening of resistor, and improves maintenance rate of capacity, and to provide a nonaqueous electrolytic solution secondary battery using the nonaqueous electrolytic solution. SOLUTION: An aprotic solvent is provided, and also the nonaqueous electrolytic solution containing a disulfonic acid ester is provided which is shown by general formulas (1) (where Z 1 and Z 2 are silylene groups independently expressed with -SiR 1 R 2 -, or alkylene groups of 1-5C) or (2) (the alkylene group of 1-5C wherein Z 1 and Z 2 may independently have a silyl group expressed with -SiR 3 R 4 R 5 as a substituent in the general formula (1)). COPYRIGHT: (C)2010,JPO&INPIT

Nonaqueous electrolytic solution, and nonaqueous electrolytic solution secondary battery using the same

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