Abstract: Carbon nanotubes were prepared by CVD method, and dissolved in N-methylpyrrolidone (NMP) by ultrasonic treatment with strong acid to prepare conductive paste of carbon nanotubes. The structure and surface morphology of the prepared carbon nanotube conductive agent slurry were investigated by XRD, SEM and BET, And the effect of adding it as a conductive agent on the electrochemical performance of LiNi_0.8Co_0.1Mn_0.1O₂ lithium ion battery was investigated.The results show that the carbon nanotubes have better dispersibility and more mesopores after treatment with aqua regia. the battery adding carbon nanotube conductive paste shows good capacity performance, and its first discharge capacity is 186.1 mAh/g, while the battery using the common conductive agent first discharge capacity is 181.2 mAh/g, This shows good cycling performance, capacity retention rate was 95.95% after 100 cycles, carbon nanometer was added The battery of the conductive paste has superior large-rate performance, and is significantly higher at 2C, 3C, and 5C rates than the battery added the conductive of SP (1 C=180mA/g).Moreover, the cell electrode interface impedance of the carbon nanotube conductive paste was added is small.