All‐solid‐state Li‐ion battery: A study on the charge/discharge mechanism of an LMO‐BCD‐MgC system

Abstract This study presents the fabrication of an all‐solid‐state lithium‐ion battery using lithium manganese oxide (LiMn 2 O 4 ; LMO) as the cathode, graphite (C), and carbon‐coated magnesium (MgC) as the anode, along with a silicate‐based solid electrolyte. To assess the charge/discharge mechanism, three polymeric membranes with varying weight percentages (5%, 30%, and 50%) of magnesium silicate are produced through battery‐cloth deposition (BCD) for use as the solid electrolyte. The findings reveal that enhancing the magnesium silicate content in the solid electrolyte (particularly at 50%) results in an increased specific capacity of the battery. The MgC anode exhibits a peak capacity of approximately 780 mAh/g during the third cycle, maintaining capacity retention of 100% over 26 cycles, addressing the issues of low specific capacity and self‐discharge in the solid‐state Li‐ion battery. Nevertheless, prolonged charge/discharge testing leads to an escalation in the surface roughness and porosity of the carbon coating on the MgC anode, resulting in a decline in capacity. These results demonstrate that the LMO‐BCD‐MgC battery system proposed in this study is a secure, eco‐friendly, and cost‐effective option with potential applications in energy storage.