700 F hybrid capacitors cells composed of activated carbon and Li₄Ti₅O₁₂ microspheres with ultra-long cycle life

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>To address the large-scale application demands of high energy density, high power density, and long cycle lifetime, 700-F hybrid capacitor pouch cells have been prepared, comprising ∼240-μm-thick activated carbon cathodes, and ∼60-μm-thick Li<SUB>4</SUB>Ti<SUB>5</SUB>O<SUB>12</SUB> anodes. Microspherical Li<SUB>4</SUB>Ti<SUB>5</SUB>O<SUB>12</SUB> (M-LTO) synthesized by spray-drying features 200–400 nm primary particles and interconnected nanopore structures. M-LTO half-cells exhibits high specific capacities (175 mAhh g<SUP>−1</SUP>), good rate capabilities (148 mAhh g<SUP>−1</SUP> at 20 C), and ultra-long cycling stabilities (90% specific capacity retention after 10,000 cycles). In addition, the obtained hybrid capacitors comprising activated carbon (AC) and M-LTO shows excellent cell performances, achieving a maximum energy density of 51.65 Wh kg<SUP>−1</SUP>, a maximum power density of 2466 W kg<SUP>−1</SUP>, and ∼92% capacitance retention after 10,000 cycles, thus meeting the demands for large-scale applications such as trolleybuses.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Assembly of 700 F AC/M-LTO hybrid capacitor pouch cells. </LI> <LI> AC and LTO electrodes with high density and high mass loading. </LI> <LI> Hybrid capacitor with high energy density, high power density, and long cyclability. </LI> </UL> </P>