High Initial Coulombic Efficiency News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Hard carbon (HC) anodes have shown extraordinary promise for sodium-ion batteries, but are limited to their poor initial coulombic efficiency (ICE) and low practical specific capacity due to the large amount of defects. These defects with oxygen containing groups cause irreversible sites for Na+ ions. Highly graphited carbon decreases defects, while potentially blocking diffusion paths of Na+ ions. Therefore, molecular-level control of graphitization of hard carbon with open accessible channels for Na+ ions is key to achieve high-performance hard carbon. Moreover, it is challenging to design a...

Prussian blue analogues (PBAs) have attracted extensive attention as cathode materials in sodium-ion batteries (SIBs) due to their low cost, high theoretical capacity, and facile synthesis process. However, it is of great challenge to control the crystal vacancies and interstitial water formed during the aqueous co-precipitation method, which are also the key factors in determining the electrochemical performance. Herein, an antioxidant and chelating agent co-assisted non-aqueous ball-milling method to generate highly-crystallized Na2-xFe[Fe(CN)6]y with hollow structure is proposed by suppress...