Subsequently, the nanometer 4BS as additive is added to positive paste of lead-acid battery. When the
batteries are tested galvanostatically between 1.75 V and 2.42 V at 0.25 C charge and 0.5 C discharge rates
at room temperature. The ratio of adding nanometer 4BS is 0%, 1% and 4% and the initial discharge
speci
fi
c capacities are 60 mAh g
1
, 65 mAh g
1
and 68 mAh g
1
. After 80 cycles, the initial discharge
capacity of positive active material with 1% nanometer 4BS decreased less than 10%, while adding 4%
nanometer 4BS, the initial discharge capacity doesn't decrease obviously.