Science, Engineering and Technology for Better Future

The current need to reduce dependence on non-renewable fuels has contributed a lot to the rapid growth of renewable energy systems and electric vehicles. One of the exciting sources of energy storage is the battery. The development of lithium-based batteries is an exciting trend and is continuously being developed for long life and high-level battery quality. Batteries are considered a primary energy storage source. They are essential materials for many applications such as vehicles and electronic devices, including laptops, mobile phones, watches, etc. With the increasing demand and use of batteries globally for many applications, much research on advanced batteries has been interested in improving their performance, significantly to extend their safety and prolong their service life. The type of batteries and some external parameters, including voltage, current, and temperature, are essential to further exploration. Research on how to minimize the pollution from after-used batteries is also needed since electronic waste cannot be disposed into nature without prior treatment. This is important in preventing environmental destruction and supporting environmental sustainability, in addition to the economic impact of reusing certain technologies. Furthermore, with the advancement of civilization and technology, everything related to engineering and sciences can be developed according to its functions and humans' need. To address the above issues, the 5th International Tropical Renewable Energy Conference (i-TREC) was held on October 29-30, 2020, via online conference. The i-TREC is an annual event organized by the Tropical Research Energy Center, Faculty of Engineering Universitas Indonesia (TREC FTUI). The theme of this conference is the role of renewableand clean energy in supporting sustainable development goals. From the papers presented there, 18 paper have been selected for publication in IJTech. These 18 papers are summarized below.