Overlithiated cathode materials for practical lithium-ion battery

• Main Author: Seow, Sean Han Yen
• Other Authors: Chen, Xiaodong
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2021
• Subjects: Engineering::Materials::Energy materials
• Online Access: https://hdl.handle.net/10356/148131
• Institution: Nanyang Technological University

There is a growing need for Lithium-ion batteries to effectively store energy for consumer electronics as well as the emerging electrical and hybrid vehicles, due to the increasing awareness in the finite supply of fossil fuels and global warming due to CO2 emissions. Current commercial Lithium-ion batteries have an issue of high-capacity loss during the initial cycles, causing the batteries to reduce its energy density and this results in shorter battery life cycles. Hence, this project aims to tackle the issue by improving the capacity retention and reducing the initial capacity loss using easily obtainable and abundant materials to reduce cost of production. This project reviews the development of overlithiated cathode materials in Lithium-ion batteries using LiMn2O4 synthesized with different concentrations of Glucose or Ascorbic acid. By comparing the effects and results of both potential samples, this will determine which gives better cycling behaviour and capacity retention. The samples are analysed and determined by the percentage capacity retention, initial capacity retention, morphology, and optimal concentration of each composition. By comparing the effects and results of both potential samples, this will determine which gives better cycling behaviour and capacity retention. The results showed that a higher concentration of Glucose will produce a battery with larger capacity with higher capacity retention, while a lower concentration of Ascorbic acid will result in larger capacity with higher capacity retention. This shows that readily available and cost-effective materials, along with the easy and quick manufacturing procedures, can be used to synthesize batteries that are more efficient than current commercial Lithium-ion batteries.