Organic materials are emerging candidates for lithium-ion batteries.Unfortunately,limited electrical conductivity and high solubility in organic electrolytes usually cause low capacity and short cycle life,which hinde...Organic materials are emerging candidates for lithium-ion batteries.Unfortunately,limited electrical conductivity and high solubility in organic electrolytes usually cause low capacity and short cycle life,which hinder the utilization of organic materials.Herein,a novel multi-carbonyl naphthalene diimide non-conjugated polymer(NDI-BU)has been readily synthesized through one-step reaction.The designed polymer structure of NDI-BU shows a long and flat discharge platform.The abundant carbonyls provide multiple reaction sites for lithium ions,and resulting in a high specific capacity of 308 mAh·g-1 at 0.2C.An incredibly long cycle life of 20,000 cycles at 5C with 82%capacity retention is achieved.This work may inspire the effective design strategy for high energy density organic cathode materials.展开更多
基金support from the National Natural Science Foundation of China(Nos.22075255,22375080,and 22175081)Co-working Space Incubation Project of Zhengzhou University of Light Industry(No.2021ZCKJ209)+3 种基金Science and Technology Project of Henan Province(No.242102240007)Key Scientific Research Project of Henan Province(No.25A530007)the Education Department of Henan Province(No.242300420206)the Science and Technology Major Program of Gansu Province of China(Nos.22ZD6FA006,23ZDFA015,and 24ZD13FA017).
文摘Organic materials are emerging candidates for lithium-ion batteries.Unfortunately,limited electrical conductivity and high solubility in organic electrolytes usually cause low capacity and short cycle life,which hinder the utilization of organic materials.Herein,a novel multi-carbonyl naphthalene diimide non-conjugated polymer(NDI-BU)has been readily synthesized through one-step reaction.The designed polymer structure of NDI-BU shows a long and flat discharge platform.The abundant carbonyls provide multiple reaction sites for lithium ions,and resulting in a high specific capacity of 308 mAh·g-1 at 0.2C.An incredibly long cycle life of 20,000 cycles at 5C with 82%capacity retention is achieved.This work may inspire the effective design strategy for high energy density organic cathode materials.
