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A new study suggests that coal resources can be utilised as carbon sources for energy storage devices, specifically supercapacitors for electric vehicles (EVs). The experiment involved a hybridised battery management system (HBMS) using coal-based pouch cell supercapacitors and Li-ion batteries, resulting in an increased maximum speed for e-rickshaws and additional power gain. The study, titled "Fabrication of pouch cell supercapacitors using abundant coal feedstock and their hybridisation with Li-ion battery for e-rickshaw application," was conducted by scientists associated with the Council of Scientific and Industrial Research (CSIR)-North East Institute of Science and Technology in Assam, India.
The researchers synthesised highly porous activated carbon with good electrochemical performance from low-grade sub-bituminous coal feedstock found in Assam. The test-bed evaluation using the HBMS involved integrating a pack of coal-based pouch cell supercapacitors with a commercial Li-ion battery in an e-rickshaw. Compared to e-rickshaws with standard batteries, the combination of supercapacitors with the battery increased the speed of the experimental e-rickshaw and delivered more power.
The experiment opens up the possibility of using Indian coal as an indigenous carbon source for manufacturing energy storage devices like supercapacitors for electric vehicles. Dr Binoy Saikia, the lead author of the study, highlighted that utilising coal without combustion for batteries and supercapacitors can be an environmentally friendly alternative, especially since coal combustion in power plants is banned in many countries due to pollution or emissions.
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