Hematite nanoflakes as anode electrode materials for rechargeable lithium-ion batteries

✍ Scribed by Li Chun; Xiaozhen Wu; Xiaoming Lou; Youxiang Zhang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 786 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2010.01.016

✦ Synopsis

Hematite (␣-Fe 2 O 3 ) nanoflakes and nanocubes were synthesized by liquid-solid-solution method and their properties as anode electrode materials for rechargeable Li + -ion batteries were measured. When changing the water to ethanol volume ratio in the synthesis system, the nanocrystals can be changed from ␣-Fe 2 O 3 to ␣-FeOOH, with shapes being tuned from nanoflakes to nanocubes, non-uniform particles and nanowires. When assembled as the anode electrode materials in rechargeable Li + -ion batteries, the hematite nanoflakes showed one more plateau in the first discharge progress of the voltage-composition curves than hematite nanocrystals with other shapes in the literature. X-ray diffraction, high-resolution transmission electron microscope and electrochemical data showed that this extra plateau came from the formation of Li 2 Fe 3 O 4 nanoclusters and amorphous Li 2 O. This experiment showed that like sizes, shapes of nanocrystals may also affect the detailed electrochemical progress.