Reinforcing effect of single-wall carbon nanotubes on the LiNi_0.6CO_0.2Mn_0.2O₂ composite cathode for high-energy-density all-solid-state Li-ion batteries

Enhancing the effective electronic transportation pathways and high loading mass of cathode are the challenges for high energy density solid-state batteries. We successfully enhanced significantly the electrochemical characteristics of all-solid-state Li-ion battery (ASSLIB) composed of graphite/SiOx anode, PVDF-HFP/Al2O3 based composite solid polymer electrolyte (CSPE), and LiNi0.6CO0.2Mn0.2O2 cathode with high proportion of 96.94 wt% in cathode by employing only small amount (0.06 wt%) of SWCNT in electrodes. The Li/CSPE/NCM@CNT cell maintained a capacity of 2.31 mAh cm(-2) at rate of 0.5C with a capacity retention of similar to 93% over 50 cycles. Moreover, The Li/CSPE/G-SiOx@CNT cell delivered an areal charge capacity of 3.7 mAh cm(-2) at a rate of 0.5C. Furthermore, the ASSLIBs with a high cathode mass loading of 36.4 mg cm(-2) delivered a high areal capacity of 4.04 mAh cm(-2) and successfully operated for longer than 300 cycles at rate of 0.5C. The ASSLIBs show excellent cyclability with capacity retention of similar to 80% and coulombic efficiency of approximately 100%, even at a considerably high cathode mass loading of 36.4 mg cm(-2) at a rate of 0.5C. The SWCNT form a conductive network throughout the electrodes by providing prolonged electron transport pathways and enhance the overall electrochemical properties of ASSLIBs.