This indicates that introducing high stacking pressure does not have much advantageous effect on the first discharging capacity. This would imply that the electrode composites prepared by the ball-milling route are functional in the sense that they form a good percolation network with only a minor fraction of active particles being isolated from others. During the first 30 cycles the discharge capacity of the cell fades down to around 110 mAh/g. From cycle 30 until the cell was stopped at 94 cycles due to a problem with the inert atmosphere in the glovebox, the cell behaved stable, and the approached discharge capacity decreased from 110 mAh/g to 90 mAh/g slowly. The coulombic efficiency (see Figure )) increased continuously and stabilized at around 99 % beyond the 30 th cycle. Moreover, it is observed that with high pressure, a higher energy efficiency can be delivered from the first cycle, and it is stabilized at around 58 % after 30 cycles. The higher energy density in comparison to the nonpressurized cell has two origins: a reduced difference between the charging and discharging plateau of ~ 0.15 V as compared to 0.09 V, and a minor influence from the increased coulombic efficiency. We also acknowledge that though it cannot be quantified precisely, it must be kept in mind that the pressure distribution in the cell is not homogenous (see discussion in 3.2.2), and we estimate that only about 75 % of the area of the pellet benefits from the applied pressure. This can partly influence the capacity retention, and one can assume that higher pressure homogenization might lead to an even higher capacity retention. From the comparison to the non-pressurized cell, we conclude that the pressure has mainly two impacts on conversion-based cathode materials. (1) Pressure helps to stabilize the percolation pathways for ions and electrons, which avoids the contact loss of active material particles and reduces the capacity fading. (2) The increase of the energy efficiency comes mainly from the plateaus of the charging and discharging process becoming more similar. This indicates that overpotentials which would be induced for the charge transfer between the active particles and the additives are decreased under pressure application. Overall, even though introducing pressure has no significant improvement on the first discharging, the cyclability and reversibility of the cell has been remarkably improved which is out-performed all the reported ASSFIBs with Bi/BiF3 as cathode.