To　achieve　stable　positive　electrode　for　promoting　the　overall　electrochemical　performance　of　Al　batteries　(ABs),　here　novel　cobalt　boride　(CoB)　nanoclusters　are　synthesized　to　construct　composite　electrodes　with　few-layer　graphene　(FLG).　Due　to　the　presence　of　amorphous　channels　in　the　employed　CoB　nanoclusters,　the　ABs　with　FLG/CoB　composite　positive　electrodes　exhibit　high　rate　capability　and　both　mechanical　and　electrochemical　stability　in　the　ABs.　With　assistance　of　in　situ　scanning　electron　microscopy　(SEM),　the　observation　results　suggest　that　the　positive　electrode　of　CoB　nanoclusters　holds　almost　ignorable　volume　variation　upon　electrochemical　processes,　which　substantially　alleviates　the　massive　electrode　expansion　induced　by　the　anion　intercalation　in　the　composite　positive　electrode.　Interestingly,　the　composite　positive　electrodes　provide　stable　reversible　energy　storage　capability　within　a　broadened　temperature　range　(-30-60　degrees　C),　promising　a　novel　strategy　to　design　advanced　ABs　positive　electrodes　with　enhanced　overall　energy　storage　performance.