Nec Corporation

Yuki Kusachi

Koji Utsugi

Tsuyoshi Katou

Shigeyuki Iwasa

Masahiro Suguro

Daisuke Kawasaki

Kentaro Nakahara

Jiro Iriyama

Yukiko Morioka

Tatsuji Numata

Sadahiko Miura

Ikiko Yamazaki

There is provided a lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability. An electrolyte solution for secondary battery comprising at least an aprotic solvent having an electrolyte dissolved therein and a compound represented by the general formula (1).

Electrolyte solution for a secondary battery

Disclosed is a polyradical compound which can be used as an electrode active material for at least one of a positive electrode and a negative electrode. The polyradical compound has a repeating unit represented by general formula (1) and is crosslinked using a bifunctional crosslinking agent having two polymerizing groups in the molecule represented by general formula (2), wherein Rto Reach independently represent hydrogen or methyl group; Rto Reach independently represent C1 to C3 alkyl group; X represents single bond, linear, branched or cyclic C1 to C15 alkylenedioxy group, alkylene group, phenylenedioxy group, phenylene group or structure represented by general formula (3); and Rto Reach independently represent hydrogen or methyl group, and k represents an integer of 2 to 5. 

Process for producing polyradical compound and battery cell

An exemplary embodiment provides: a composite of an electrode active material and an electric conductivity-imparting agent, which has a high capacity density and can produce a large current; a method for producing it; and a battery which has a high energy density and can produce a large output. Specifically, a polyradical compound as the electrode active material and a conductive material are heated and mixed at a temperature of not less than the softening temperature of the polyradical compound and less than the decomposition temperature thereof to form a composite of the polyradical compound and the conductive material. Fabricating an electrode using the composite can provide a novel battery having a high energy density and a large output.

Polyradical compound-conductive material composite, method for producing the same, and battery using the same

Additive for an electrolyte solution for an electrochemical device

Secondary battery using an electrolyte solution

A lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability is provided. The secondary battery comprises a positive electrode, a negative electrode, and an electrolyte solution comprising an aprotic solvent having at least an electrolyte dissolved therein, wherein the positive electrode comprises a lithium-manganese composite oxide having a spinel structure as a positive electrode active material, and the electrolyte solution comprises a compound represented by the general formula (1).

Secondary battery

The present invention provides a non-aqueous electrolyte secondary battery having excellent properties such as energy density and electromotive force and being excellent in cycle life, storage property and safety. In the present invention, the non-aqueous electrolyte secondary battery comprises a substance having a peak from 162.9 to 164.0 eV by XPS analysis on the anode surface.

Non-aqueous electrolyte secondary battery

The present invention provides a technology of inhibiting the decomposition of the solvent of the electrolyte solution for the secondary battery. Further, the present invention provides a technology of prohibiting the resistance increase of the secondary battery and improving the storage properties such as improving the capacity retention ratio. The electrolyte solutioncomprising non-proton solvent and cyclic sulfonic ester including at least two sulfonyl groups may be used.

Growing community of inventors

Tokyo, Japan

Yuki Kusachi