In fluoride shuttle batteries (FSBs), the addition of an anion acceptor (AA) is required to dissolve the supporting electrolyte salt in an organic solvent. Based on theoretical calculations and practical experiments, the effectiveness of triphenylboroxine (TPhBX) as an AA for FSB was verified. Using an electrolyte with TPhBX as an AA, the specific capacities of the following two types of lead fluoride (PbF2) electrodes were evaluated: (i) PbF2 pulverized using a ball mill, (ii) pulverized PbF2 mixed with carbon using a ball mill. The experimental results indicate that mixing PbF2 with carbon using a ball mill increases the specific capacity of PbF2 electrode.