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1. (WO2018181555) COMPOSITE METAL OXIDE, POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE, SODIUM SECONDARY BATTERY, AND METHOD FOR PRODUCING COMPOSITE METAL OXIDE

Pub. No.:    WO/2018/181555    International Application No.:    PCT/JP2018/012937
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Thu Mar 29 01:59:59 CEST 2018
IPC: C01G 53/00
H01M 4/505
H01M 4/525
H01M 10/054
Applicants: SUMITOMO CHEMICAL COMPANY, LIMITED
住友化学株式会社
Inventors: TONOSAKI Kiwamu
外崎 究
Title: COMPOSITE METAL OXIDE, POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE, SODIUM SECONDARY BATTERY, AND METHOD FOR PRODUCING COMPOSITE METAL OXIDE
Abstract:
Provided is a composite metal oxide which is represented by formula (1) and has an α-NaFeO2 type crystal structure, the composite metal oxide being characterized in that the peak width at half maximum of the (104) plane is 0.250° or less (2θ) as measured by powder X-ray diffraction. NaxM1r(FeyNizMnwM1-y-z-w)O2±δ (1) (In formula (1), M is B, Si, V, Ti, Co, Mo, Pd, Re, Pb, or Bi, M1 is Mg or Ca, 0≤r≤0.1, x is 0.5-1, y is 0.1-0.5, z is greater than 0 and less than 0.4, w is greater than 0 and less than 0.4, δ is 0-0.05, and y+z+w≤1)