Nitrogen Doped Multi-channel Graphite for High Rate and High Capacity Li Ion Battery

更新时间:2023-05-28

【摘要】Nitrogen doped multi-channel graphite was successfully prepared by using nitrogen doping and KOH etching technologies. The three-electrode and EIS tests indicates that the etched graphite possesses lower electrochemical resistance than the pristine graphite. The coin cell tests demonstrate that N doped multichannel graphite possesses a specific capacity of 361 m Ah/g and coulombic efficiencies of 91.4%. No dramatic irreversible capacity loss results from the increased specific surface area(from 1.60 to 2.08 m~2/g), removing the need for a trade-off between irreversible capacity loss and surface area. Full polymer cells were fabricated and electrochemical capabilities were measured. In 3 C fast charge protocol, the charging capacity can reach 51% within 10 min charge, and 100% within 30 min, demonstrating excellent fast charging characteristic. The fast charge cycle performance with 3 C-rate charge and 1 C-rate discharge from 4.35-3.0 V was conducted at RT temperature. The capacity retention is 94% after 600 cycles, which shows good cycle performance.

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