Abstract
Hybridizing battery and capacitor materials to construct lithium ion capacitors (LICs) has been regarded as a promising avenue to bridge the gap between high-energy lithium ion batteries and high-power supercapacitors. One of the key difficulties in developing advanced LICs is the imbalance in the power capability and charge storage capacity between anode and cathode. Herein, we design a new LIC system by integrating a rationally designed Sn-C anode with a biomass-derived activated carbon cathode. The Sn-C nanocomposite obtained by a facile confined growth strategy possesses multiple structural merits including well-confined Sn nanoparticles, homogeneous distribution and interconnected carbon framework with ultra-high N doping level, synergically enabling the fabricated anode with high Li storage capacity and excellent rate capability. A new type of biomass-derived activated carbon featuring both high surface area and high carbon purity is also prepared to achieve high capacity for cathode. The assembled LIC (Sn-C//PAC) device delivers high energy densities of 195.7 Wh kg−1 and 84.6 Wh kg−1 at power densities of 731.25 W kg−1 and 24375 W kg−1, respectively. This work offers a new strategy for designing high-performance hybrid system by tailoring the nanostructures of Li insertion anode and ion adsorption cathode.
Highlights
Hybridizing battery and capacitor materials to construct lithium ion capacitors (LICs) has been regarded as a promising avenue to bridge the gap between high-energy lithium ion batteries and high-power supercapacitors
These results are remarkable compared with the state-of-the-art reports for LICs, and offers a new platform for designing high-performance hybrid supercapacitors by tailoring the nanostructures of both anode and cathode
The Sn-C nanocomposite was prepared by simple liquid impregnation of a tin salt solution on a well-designed N-rich mesoporous carbon framework, followed by thermal treatment
Summary
Hybridizing battery and capacitor materials to construct lithium ion capacitors (LICs) has been regarded as a promising avenue to bridge the gap between high-energy lithium ion batteries and high-power supercapacitors. To increase the capacity of the high-rate capacitive cathode, we demonstrate a new type of high surface area activated carbon (PAC) derived from the simple activation of pomelo peel Coupling these two electrode materials gives a high-performance hybrid LIC (Sn-C//PAC) that can be operated between 2.0~4.5 V and exhibit high energy densities of 195.7 Wh kg−1 and 84.6 Wh kg−1 at power densities of 731.25 W kg−1 and 24375 W kg−1, respectively. These results are remarkable compared with the state-of-the-art reports for LICs, and offers a new platform for designing high-performance hybrid supercapacitors by tailoring the nanostructures of both anode and cathode
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