▎ 摘　　要

NOVELTY - A phosphorus-doped nanocarbon cage material comprises nanoporous and mesoporous structure. The nanocarbon cage material has a total specific surface area of 300-600 m2/g, with a specific surface area within the micropores of 50-130 m2/g, accounting for 10-25% of the total specific surface area. The average pore size is 10-20 nm. Surface analysis by X-ray photoelectron spectroscopy reveals that the nanocarbon cage material has a carbon atomic percentage content of 90-97.5% and a phosphorus atomic percentage content of 0.01-1%. USE - The phosphorus-doped nano-carbon cage material is useful in an electrode material of a lithium ion capacitor which is used in electrochemical energy storage. ADVANTAGE - The phosphorus-doped nanocarbon cage material possesses a combination of microporous and mesoporous structures, with a total specific surface area of 300-600 m2/g, a specific surface area within the micropores of 50-130 m2/g, accounting for 10-25% of the total specific surface area. The average pore size is 10-20 nm. Surface analysis by X-ray photoelectron spectroscopy reveals that the nanocarbon cage material has a carbon atomic percentage content of 90-97.5% and a phosphorus atomic percentage content of 0.01-1%. Lithium-ion capacitor negative electrodes fabricated using this material exhibit excellent specific capacity, cycling performance, and rate capability, with a single electrode specific capacity exceeding 400mAh/g and a capacity retention rate exceeding 95% after 500 cycles. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the phosphorus-doped nanocarbon cage material; electrode material of lithium; and (3) an cathode lithium of the electrode material