Hathaikarn Manuspiya
Chulalongkorn University, Thailand
Title: Cellulose based separator membrane in Li-ion battery device
Biography
Biography: Hathaikarn Manuspiya
Abstract
The separator is a porous membrane placed between negative and positive electrodes which can be permeable to ionic flow while preventing electric contact of the opposite polarity electrodes. Conventionally, tit was fabricated by thermoplastic polyolefins. Among environmental concerns, the biodegradable materials were used instead of the conventional materials, known as green separator membrane. Poly(lactic acid) (PLA) is the one type of alternative biodegradable polymer derived from renewable resources which has high mechanical properties and high dimensional change. However, there are several limitations of PLA including non-stable chemical resistance and low thermal stability. Poly(butylene succinate) (PBS) is commercially available aliphatic polyester with high flexibility, good toughness, high chemical resistance, and has a good biodegradability. Therefore, PBS was blended to improve the chemical resistance of PLA. Subsequently, cellulose was filled to improve the thermal stability and wettability of PLA. To provide more specific properties, cellulose was modified to sulfonated cellulose via oxidation/sulfonation reaction and plasma surface treatment. The obtained modified cellulose provided high hydrophilicity, biocompatible and surface area given an opportunity for using in wide applications, especially improved thermal properties, wettability and air permeability. The results indicated that cellulose extracted from sugarcane bagasse can be modified the high value added of agriculture waste in Thailand. PLA/PBS blended with modified cellulose and then fabricated to be a separator membrane via phase inversion method which creating the porous membrane. The green separator membranes were used instead of traditional separator membranes in the battery cell to test the performance of Li-ion battery.