Chemical doping is a powerful method to intrinsically tailor the electrochemical properties of electrode materials.Here,an interstitial boron-doped tunnel-type VO_(2)(B)is constructed via a facile hydrothermal method....Chemical doping is a powerful method to intrinsically tailor the electrochemical properties of electrode materials.Here,an interstitial boron-doped tunnel-type VO_(2)(B)is constructed via a facile hydrothermal method.Various analysis techniques demonstrate that boron resides in the interstitial site of VO_(2)(B)and such interstitial doping can boost the zinc storage kinetics and structural stability of VO_(2)(B)cathode during cycling.Interestingly,we found that the boron doping level has a saturation limit peculiarity as proved by the quantitative analysis.Notably,the 2 at.%boron-doped VO_(2)(B)shows enhanced zinc ion storage performance with a high storage capacity of 281.7 mAh g^(-1) at 0.1 A g^(-1),excellent rate performance of 142.2 mAh g^(-1) at 20 A g^(-1),and long cycle stability up to 1000 cycles with the capacity retention of 133.3 mAh g^(-1) at 5 A g^(-1).Additionally,the successful preparation of the boron-doped tunneltype α-MnO_(2) further indicates that the interstitial boron doping approach is a general strategy,which supplies a new chance to design other types of functional electrode materials for multivalence batteries.展开更多
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Key R&D projects of Henan Province,Grant/Award Number:221111240600National Natural Science Foundation of China,Grant/Award Numbers:U1704256,52272243,52202316+2 种基金Natural Science Foundation of Henan Province,Grant/Award Numbers:212300410300,212300410416PhD Research Fund Project,Grant/Award Number:13501050089School Key Project,Zhengzhou University of Light Industry,Grant/Award Number:2021ZDPY0203。
文摘Chemical doping is a powerful method to intrinsically tailor the electrochemical properties of electrode materials.Here,an interstitial boron-doped tunnel-type VO_(2)(B)is constructed via a facile hydrothermal method.Various analysis techniques demonstrate that boron resides in the interstitial site of VO_(2)(B)and such interstitial doping can boost the zinc storage kinetics and structural stability of VO_(2)(B)cathode during cycling.Interestingly,we found that the boron doping level has a saturation limit peculiarity as proved by the quantitative analysis.Notably,the 2 at.%boron-doped VO_(2)(B)shows enhanced zinc ion storage performance with a high storage capacity of 281.7 mAh g^(-1) at 0.1 A g^(-1),excellent rate performance of 142.2 mAh g^(-1) at 20 A g^(-1),and long cycle stability up to 1000 cycles with the capacity retention of 133.3 mAh g^(-1) at 5 A g^(-1).Additionally,the successful preparation of the boron-doped tunneltype α-MnO_(2) further indicates that the interstitial boron doping approach is a general strategy,which supplies a new chance to design other types of functional electrode materials for multivalence batteries.
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.
