Solution-Based Preparation of Graphene-Li2s Composite Cathodes for Lithium/Sulfur and Lithium-Ion Batteries
Abstract
Fully-lithiated lithium sulfide (Li2S, theoretical capacity 1166 mAhg-1) could be a more promising cathode material than sulfur (S), because it is compatible with safer and more stable Li-free anodes (such as graphite or silicon-based ones, to name a few). Unfortunately, Li2S suffers from low electrical and low ionic conductivities as well as the dissolution and shuttling of lithium polysulfides during cycling, as S cathodes do [1]. Due to the high melting point of commercial Li2S (950°C), the preparation of carbon-Li2S composites by melt infiltration is difficult. The large particle size (30-50 µm) makes it challenging to achieve high capacity utilization of this cathode material. The ball milling has been the most common procedure utilized to reduce the size of commercial Li2S powders to improve their rate performance and capacity utilization. Unfortunately, the ball milling procedure does not allow formation of uniform particles with controlled morphology, uniform carbon coating and good electrochemical performance [2, 3].
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 01, 2014
- Source ID
- 10.1149/ma2014-01/2/181
Entities
People
- Alexandre Magasinski
- Feixiang Wu
- Gleb Yushin
- Hyea Kim
- Jung Tae Lee