NaClO4 as an effective electrolyte additive for high-energy Li-ion batteries

NaClO4 is utilized as a salt-type electrolyte additive to improve the electrochemical performance in both Li-rich/graphite full cells and Li-rich/Li half cells. The corresponding characterizations such as scanning electron microscopy and X-ray photoelectron spectroscopy reveal that the NaClO4-added electrolyte can suppress the transition metal dissolution from Li-rich cathode and form a stable conductive cathode electrolyte interface layer to protect Li-rich cathode and promote Li+ ions transfer. A small amount (0.1 wt%) of NaClO4 additive enables Li-rich/graphite full cells to maintain 86% capacity after 50 cycles and Li-rich/Li half cells to maintain 95% capacity after 100 cycles, showing a great application potential.