A novel cathode that provides high energy capacity and long cyclic stability simultaneously for lithium-sulfur (Li-S) battery.
Li-S batteries are mainly projected to be used in aviation, automotive, electronic device, and the power & energy sector due to the growing demand for lightweight and higher energy density battery types. However, current Li-S batteries have problems with sulfur loading and polysulfide dissolution & shuttling. Here we present a promising cathode developed by a group of researchers led by Prof. Yabing Qi. The cathode is a carbon nanotube (CNT) sponge whose surface is optimally deposited with TiN and TiO2 layers. As a result of this cathode structure, the Li-S battery overcomes the above problems and has improved areal capacity (energy density) and long cyclic stability simultaneously.
The technology is based on a novel method for depositing, by atomic layer deposition (ALD), precise cathode TiN-TiO2 heterostructure layers on a three-dimensional (3D) conductive carbon nanotube (CNT) sponge scaffold. The TiN-TiO2 heterostructure by ALD can be optimized in a nanometer scale. As a result, long cyclic stability (85% capacity retention after 500 cycles at a 1.0 charge rate) and high areal capacity (20.5 mAh cm-2 at a 0.2 charge rate) is achieved for a Li-S battery.
- Lithium-sulfur battery
- High areal capacity
- Long cyclic stability
- High sulfur loading