Micron-sized, carbon-coated Li4Ti5O12 as high power anode material for advanced lithium batteries

✍ Scribed by Hun-Gi Jung; Junghoon Kim; Bruno Scrosati; Yang-Kook Sun

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 588 KB
• Volume: 196
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2011.04.019

✦ Synopsis

Spherical, high tap density, carbon-coated Li 4 Ti 5 O 12 powders are synthesized by a spray-drying process followed by a facile pitch coating. XRD, SEM, TEM analyses show that the carbon layer uniformly coats the Li 4 Ti 5 O 12 particles without producing any crystalline changes. We demonstrate that the carbon coating significantly increases the electrical conductivity of Li 4 Ti 5 O 12 making it an efficient, high rate electrode for lithium cells. The electrochemical tests in fact confirm that the 3.25 wt% carbon-coated Li 4 Ti 5 O 12 electrode operates with ultra high rate capacity levels, i.e., 100 C and has excellent capacity retention and charge-discharge efficiency for a life extending over 100 cycles.