Sumitomo Chemical Company, Limited

Maiko Saka

Yuichiro Imanari

Taketsugu Yamamoto

Chikara Murakami

Kenji Takamori

Hiroshi Inukai

Tetsuri Nakayama

Cedric Pitteloud

Hidekazu Yoshida

Hideaki Nakajima

Shigekazu Ohmori

Daisuke Nakaji

Disclosed is a sodium secondary battery. The sodium secondary battery comprises a first electrode and a second electrode comprising a carbonaceous material. The carbonaceous material satisfies one or more requirements selected from the group consisting of requirements 1, 2, 3 and 4. Requirement 1: R value (=ID/IG) obtained by Raman spectroscopic measurement is 1.07 to 3. Requirement 2: A value and &#x3c3;value obtained by small angle X-ray scattering measurement are &#x2212;0.5 to 0 and 0 to 0.010, respectively. Requirement 3: for an electrode comprising an electrode mixture obtained by mixing 85 parts by weight of the carbonaceous material with 15 parts by weight of poly(vinylidene fluoride), the carbonaceous material in the electrode after being doped and dedoped with sodium ions is substantially free from pores having a size of not less than 10 nm. Requirement 4: Qvalue obtained by a calorimetric differential thermal analysis is not more than 800 joules/g.

Sodium secondary battery comprising carbonaceous material

The present invention provides a positive electrode active material. The positive electrode active material is represented by the following formula (I) and has a BET specific surface area of larger than 5 m/g and not larger than 15 m/g:LiMMO&#x2003;&#x2003;(I)wherein Mis at least one transition metal element selected from Group 5 elements and Group 6 elements of the Periodic Table, Mis at least one transition metal element other than Mand selected from among transition metal elements excluding Fe, x is not less than 0.9 and not more than 1.3, and y is more than 0 and less than 1.

Positive electrode active material

The present invention provides an electrode active material, an electrode and a non-aqueous electrolyte secondary battery. The electrode active material contains the following powder (A) and powder (B): (A) a powder of a lithium mixed metal oxide that is represented by the following formula (1) and has a layered rock-salt type crystal structure, the powder having a BET specific surface area of from 3 m/g to 30 m/g,Li(NiMnFe)O&#x2003;&#x2003;(1)wherein x is within a range of more than 0 to less than 1, y is within a range of more than 0 to not more than 0.1, and x+y is within a range of more than 0 to less than 1;(B) a powder of a lithium mixed metal oxide that has a spinel type crystal structure. The electrode contains the electrode active material. The non-aqueous electrolyte secondary battery includes the electrode as a positive electrode.

Electrode active material comprising a mixture of a layered crystal structure material and a spinel crystal structure material, electrode, and non-aqueous electrolyte secondary battery

The present invention provides a transition metal phosphate and a production process thereof, a positive electrode, and a sodium secondary battery. The transition metal phosphate contains sodium (Na), phosphorus (P) and a transition metal element and having a BET specific surface area of 1 m/g to 50 m/g. The process for producing a transition metal phosphate comprises steps (1) and (2): (1) a step of bringing a phosphorus (P) source, a sodium (Na) source, an M source (M is one or more transition metal elements) and water into contact with each other, and obtaining a liquid material thereby, and (2) a step of separating water from the liquid material and obtaining a transition metal phosphate thereby.

Transition metal phosphate, production process thereof, positive electrode, and sodium secondary battery

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Tsukuba, Japan

Maiko Saka