The influence of added nano carbon black on the electrical properties of the cathode of a lithium-ion secondary battery

The cathode of a lithium-ion secondary battery was fabricated using lithium iron phosphate blended with nano carbon black. The effects of four kinds of carbon black on lithium iron phosphate were evaluated by irreversible capacity loss and cycling performance. Analyses results show that the specimen 1B had the lowest irreversible capacity loss at charge-discharge cycling rate 1C among all of the specimens to which 1 wt.% carbon black was added. All of the specimens had a lower chargedischarge capacity at cycling rate 1C and a higher charge-discharge capacity at cycling rate C/2. Cycling performance test results indicated that the specimen 1B had the highest discharge-capacity and the lowest fade rate.