Details

Autor(en) / Beteiligte

• Deng, Qijiu
• Wang, Liping
• Li, Jingze

Titel

Electrochemical characterization of Co3O4/MCNTs composite anode materials for sodium-ion batteries

Ist Teil von

• Journal of materials science, 2015-06, Vol.50 (11), p.4142-4148

Ort / Verlag

Boston: Springer US

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A composite of transition metal oxide Co 3 O 4 and multiwalled carbon nanotubes (MCNTs) was applied as an anode material for sodium-ion batteries via a simply modified solid-state reaction and sonication method. The as-prepared Co 3 O 4 /MCNTs composite shows improved electrochemical performance than bare Co 3 O 4 owing to the Co 3 O 4 /MCNTs nanostructure that benefits Na ion and electronic transport together with buffering the large volume change of Co 3 O 4 during charging and discharging process. Additionally, the Na-storage behavior and the original capacity loss of Co 3 O 4 based on the conversion reaction have been investigated through cyclic voltammogram, X-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, and selected area electron diffraction. It is firstly demonstrated that in discharge state, Co 3 O 4 particles initially react with Na to produce CoO and then is further reduced to nanosized Co in an amorphous sodium oxides matrix. In the charge process, Co nanoparticles were partially oxidized to Co 3 O 4 , the other part of the CoO remain leading capacity loss. These results offer new insights into the electrochemical process of transition metal-based anode materials for Na-ion batteries.