Reference no: EM132950604
The analysis of electrical and lifetime performance of Lithium-Sulfur battery.
Objective 1. To study various compositions of cathodes, anodes and electrolytes of Lithium-Sulfur battery on electrical and lifetime performance from previous studies.
Objective 2. To investigate the electrical and lifetime performance of Lithium-Sulfur Battery.
Objective 3. To improve the "shuttle" effect of the sulfide discharge products and the conductivity of the sulfide at cathode of Lithium-Sulfur battery by adding additives with different compositions.
Lithium (Li)-ion batteries are currently the primary energy storage devices in the communications, transportation and renewable-energy sectors. However, scaling up the Li-ion battery technology to meet current increasing demands is still problematic and issues such as safety, costs, and electrode materials with higher performance are under intense investigation. The Lithium (Li)- sulfur (S) battery is a promising electrochemical system as a high-energy rechargeable battery due to its low cost, large specific capacity, high specific energy, and its ecofriendly footprint. The Li-S battery exhibits excellent potential and has attracted the attention of battery developers in large scale production in recent years.
Although the Li-S battery has considerable advantages, it still suffers from a series of problems that have hindered its practical application. The discharge products from the sulfide cathode precipitate and cover the positive electrode surface which causes poor electrode rechargeability and capacity limitation. This is the so-called internal "shuttle" effect, which leads to the corrosion of the lithium anode and consequently causes poor efficiency and a short life cycle in rechargeable Li-S batteries. Another problem is the very poor electronic conductivity of sulfur, which causes poor electrochemical contact of the sulfur and leads to low utilization of active materials in the cathode. From previous studies, carbon nanofiber, mesoporous carbon, multi-wall carbon nanotube and graphene are added to the cathode to serve as confinement material for the sulfur discharge products as well as to improve electrical conductivity of sulfides. While gel electrolytes and solid electrolytes have been reported as a means of slowing down the sulphide discharge products shuttle by reducing the ionic mobility of the electrolytes.
The aim of this project is to research on the additives at the sulfide cathode and electrolytes to improve the "shuttle" effect of the discharge products and the conductivity of the sulfide.
1. Experimental works such as fabrication of the Lithium-Sulfur battery would be performed in CPCE labs.
2. Characterizations and electrical measurement would be performed in PolyU UMF and labs.
Attachment:- Project Proposals.rar