Tailoring interfacial stability and ion kinetics via weakly-solvated fluorinated solvents for high-performance lithium metal batteries.

High-voltage lithium metal batteries (LMBs) have emerged as ideal candidates for achieving high-energy-density energy storage devices. Notably, high-reactive lithium metal and high-voltage transition metal oxide cathodes require electrolytes with superior electrochemical stability and interfacial compatibility. Herein, a solvent chemistry electrolyte design strategy is proposed that a weakly-solvated fluorinated bis(2,2,2-trifluoroethyl) carbonate (TFEC) was introduced into carbonate electrolyte for enhanced high voltage performance.

Uncovering the inherent link between pseudo-graphite structure and closed-pore formation in hard carbon.

Elucidating the formation mechanism of closed pores is critical for interpreting the sodium storage mechanism and developing high-performance hard carbon anodes for sodium-ion batteries. Although numerous strategies for fabricating closed pores have been developed, the underlying evolutionary principles remain poorly understood. This work identified the inherent relationship between pseudo-graphite structures and closed pores through regulating pseudo-graphite structures in the precursor and analyzing their structural evolution during high-temperature carbonization.