Due to the sufficient ion diffusion channels provided by the large interlayer spacing, layered silicates are widely considered as potential anode materials for lithium ion and sodium ion batteries. However, due to the...Due to the sufficient ion diffusion channels provided by the large interlayer spacing, layered silicates are widely considered as potential anode materials for lithium ion and sodium ion batteries. However, due to the poor electronic conductivity, the application of layered silicates for electrochemical energy storage has been greatly limited. Carbon nanotube(CNT) film has excellent electrical conductivity and a unique interconnected network, making it an ideal matrix for composite electrochemical material. We herein report a CNT@nickel silicate composite film(CNT@NiSiO) fabricated by a SiO2-mediated hydrothermal conversion process, for sodium storage with excellent electrochemical properties. The obtained composite possesses a cladding structure with homogeneous nanosheets as the outermost and CNT film as the inner network matrix, providing abundant ion diffusion channels, high electronic conductivity, and good mechanical flexibility. Due to these merits, this material possesses an excellent electrochemical performance for sodium storage, including a high specific capacity up to 390 mAh g-1 at 50 mA g-1, good rate performance up to 205 mAh g-1 at 500 mA g-1, and excellent cycling stability. On this basis, this work would bring a promising material for various energy storage devices and other emerging applications.展开更多
The rapid development of portable and wearable electronics has called for novel flexible electrodes with superior performance.The development of flexible electrode materials with excellent mechanical and electrochemic...The rapid development of portable and wearable electronics has called for novel flexible electrodes with superior performance.The development of flexible electrode materials with excellent mechanical and electrochemical properties has become one of the key factors for this goal.Here,a Ni_(x)Co_(y)-silicate@CNTs film is developed as a flexible anode for lithium ion batteries(LIBs).On this film,Ni_(x)Co_(y)-silicate nanosheets are firmly and intimately anchored on the surface of CNTs,which have a 3D network structure and link the adjacent nanosheets together.Benefitted from this,the composite film is not only sufficient to withstand various deformations due to its excellent flexibility but also has excellent electrochemical properties,in terms of high reversible capacity of 1047 mAh g^(-1) at 0.1 A g^(-1) as well as a high rate and cycling performance(capacity retention up to 78.13% after 140 cycles).The pouch-type full flexible LIB using this material can stably operate under various bending conditions,showing the great potential of this 3 D Ni_(x)Co_(y)-silicate@CNTs film for flexible energy storage devices with high durability.展开更多
基金supported by the National Natural Science Foundation of China (No.51072130 and 51502045)the Australian Research Council (ARC) through Discovery Early Career Researcher Award (DECRA, No.DE170100871) program。
文摘Due to the sufficient ion diffusion channels provided by the large interlayer spacing, layered silicates are widely considered as potential anode materials for lithium ion and sodium ion batteries. However, due to the poor electronic conductivity, the application of layered silicates for electrochemical energy storage has been greatly limited. Carbon nanotube(CNT) film has excellent electrical conductivity and a unique interconnected network, making it an ideal matrix for composite electrochemical material. We herein report a CNT@nickel silicate composite film(CNT@NiSiO) fabricated by a SiO2-mediated hydrothermal conversion process, for sodium storage with excellent electrochemical properties. The obtained composite possesses a cladding structure with homogeneous nanosheets as the outermost and CNT film as the inner network matrix, providing abundant ion diffusion channels, high electronic conductivity, and good mechanical flexibility. Due to these merits, this material possesses an excellent electrochemical performance for sodium storage, including a high specific capacity up to 390 mAh g-1 at 50 mA g-1, good rate performance up to 205 mAh g-1 at 500 mA g-1, and excellent cycling stability. On this basis, this work would bring a promising material for various energy storage devices and other emerging applications.
基金supported by the National Natural Science Foundation of China(No.51072130,51502045,and 21905202)the Australian Research Council(ARC)through Discovery Early Career Researcher Award(DECRA,No.DE170100871)program。
文摘The rapid development of portable and wearable electronics has called for novel flexible electrodes with superior performance.The development of flexible electrode materials with excellent mechanical and electrochemical properties has become one of the key factors for this goal.Here,a Ni_(x)Co_(y)-silicate@CNTs film is developed as a flexible anode for lithium ion batteries(LIBs).On this film,Ni_(x)Co_(y)-silicate nanosheets are firmly and intimately anchored on the surface of CNTs,which have a 3D network structure and link the adjacent nanosheets together.Benefitted from this,the composite film is not only sufficient to withstand various deformations due to its excellent flexibility but also has excellent electrochemical properties,in terms of high reversible capacity of 1047 mAh g^(-1) at 0.1 A g^(-1) as well as a high rate and cycling performance(capacity retention up to 78.13% after 140 cycles).The pouch-type full flexible LIB using this material can stably operate under various bending conditions,showing the great potential of this 3 D Ni_(x)Co_(y)-silicate@CNTs film for flexible energy storage devices with high durability.
