Tetraethyl orthosilicate (TEOS) is an ester of orthosilicic acid, which exists in small amounts in nature wherever silica is in contact with water. The ester is also known by several other names, ...

To remove the silica content, they treated it with sodium hydroxide, activated the hard carbon at high temperatures, and mixed it with ethyl orthosilicate, the South China Morning Post reported.

Once their anode was complete, the team put it in a standard sodium-ion battery to see how well it worked. They found it had a reversible capacity of 281.5 mAh/g at 1°C and held onto 91.9% of its ...