炭层间距对动力锂离子电池石墨负极电化学性能的影响研究

In this paper, the graphite with carbon layer distance d002 between 0.3354-0.3404 nm was prepared by graphite intercalation in the H2SO4-H2O2 system, and carbon coating. The influence on electrochemical properties by carbon layer distance was investigated. The results show that with the increase of d002, charge and discharge capacity increases, the coulombic efficiency increased first and then decreased. When d002 is 0.3396 nm, the discharge capacity and coulombic efficiency reached their maximum, respectively, 348 mAh/g and 94.6%. The capacity retention is 88.6% after 200 cycles. The discharge capacity in 10C of graphite with 0.3396 nm carbon layer distance could still maintain 80% of discharge capacity in 0.5C, exhibiting excellent high-rate discharge performance