Details

Autor(en) / Beteiligte

• Huang, Xiao-lei
• Wang, Ru-zhi
• Xu, Dan
• Wang, Zhong-li
• Wang, Heng-guo
• Xu, Ji-jing
• Wu, Zhong
• Liu, Qing-chao
• Zhang, Yu
• Zhang, Xin-bo

Titel

Homogeneous CoO on Graphene for Binder-Free and Ultralong-Life Lithium Ion Batteries

Ist Teil von

• Advanced functional materials, 2013-09, Vol.23 (35), p.4345-4353

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ultralong cycle life, high energy, and power density rechargeable lithium‐ion batteries are crucial to the ever‐increasing large‐scale electric energy storage for renewable energy and sustainable road transport. However, the commercial graphite anode cannot perform this challenging task due to its low theoretical capacity and poor rate‐capability performance. Metal oxides hold much higher capacity but still are plagued by low rate capability and serious capacity degradation. Here, a novel strategy is developed to prepare binder‐free and mechanically robust CoO/graphene electrodes, wherein homogenous and full coating of β‐Co(OH)2 nanosheets on graphene, through a novel electrostatic induced spread growth method, plays a key role. The combined advantages of large 2D surface and moderate inflexibility of the as‐obtained β‐Co(OH)2/graphene hybrid enables its easy coating on Cu foil by a simple layer‐by‐layer stacking process. Devices made with these electrodes exhibit high rate capability over a temperature range from 0 to 55 °C and, most importantly, maintain excellent cycle stability up to 5000 cycles even at a high current density. Homogeneous β‐Co(OH)2 on graphene is synthesized using a simple and effective electrostatic induced spread growth method, which ensures the facile fabrication of a binder‐free and mechanically robust CoO/graphene electrode by means of a layer‐by‐layer stacking process. When employed as an anode in Li‐ion batteries, a high rate capability and excellent cycle stability up to 5000 cycles are successfully obtained.