Hollow selenium encapsulated into 3D graphene hydrogels for lithium–selenium batteries with high rate performance and cycling stability

Fan, Shanhui; Zhang, Yong; Li, Shuhua; Lan, Tianyu; Jian-li, XU

doi:10.1039/c6ra28463a

Cited by 18 publications

(11 citation statements)

References 30 publications

(33 reference statements)

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“…This finding was further supported by the thermogravimetric analysis of the dried Cu 2 Se inks, in which a significant weight loss was observed at 600–700 K, agreeing with the temperature of Se evaporation (Supplementary Fig. 9 ) 63 . In addition, despite the sintering shrinkage of 60–70%, the sintered materials well maintained their primary architectures without substantial distortion (inset of Fig.…”

Section: Resultssupporting

confidence: 73%

Cu2Se-based thermoelectric cellular architectures for efficient and durable power generation

Choo

Ejaz

et al. 2021

Nat Commun

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Thermoelectric power generation offers a promising way to recover waste heat. The geometrical design of thermoelectric legs in modules is important to ensure sustainable power generation but cannot be easily achieved by traditional fabrication processes. Herein, we propose the design of cellular thermoelectric architectures for efficient and durable power generation, realized by the extrusion-based 3D printing process of Cu2Se thermoelectric materials. We design the optimum aspect ratio of a cuboid thermoelectric leg to maximize the power output and extend this design to the mechanically stiff cellular architectures of hollow hexagonal column- and honeycomb-based thermoelectric legs. Moreover, we develop organic binder-free Cu2Se-based 3D-printing inks with desirable viscoelasticity, tailored with an additive of inorganic Se82− polyanion, fabricating the designed topologies. The computational simulation and experimental measurement demonstrate the superior power output and mechanical stiffness of the proposed cellular thermoelectric architectures to other designs, unveiling the importance of topological designs of thermoelectric legs toward higher power and longer durability.

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Section: Resultssupporting

confidence: 73%

Cu2Se-based thermoelectric cellular architectures for efficient and durable power generation

Choo

Ejaz

et al. 2021

Nat Commun

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“…An in situ formed C/Se hybrid retained a reversible capacity of 430 mA h g Se −1 after 250 cycles upon cycling at a current density of 100 mA g −1 . Hollow nanospheres of Se@RGO revealed an initial capacity of 543 mA h g Se −1 , and the capacity stabilized at 343 mA h g Se −1 after 50 cycles at 0.2 C rate. A nitrogen‐doped carbon scaffold with Se (Se/NCS) exhibited an initial capacity of 960 mA h g Se −1 .…”

Section: Resultsmentioning

confidence: 99%

“…AS e/CNT [8] hybrid showed ac apacityo f4 00 mA hg Se À1 , which declined to 315 mA hg Se À1 after 100 cycles. In another study, [31] aL i-Se cell with ac arbon interlayer gave an initial capacity of 656 mA hg Se À1 ,b ut it faded to 520 mA hg Se À1 in the 20th cycle.A ni nsitu formed C/Se hybrid [32] retained ar eversible capacity of 430 mA hg Se À1 after 250 cycles upon cycling at ac urrent density of 100 mA g À1 .H ollow nanospheres of Se@RGO [33] revealed an initial capacity of 543 mA hg Se À1 ,a nd the capacity stabilized at 343 mA hg Se À1 after 50 cycles at 0.2 C rate. An itrogen-doped carbon scaffold with Se (Se/NCS) [11] exhibited an initial capacity of 960 mA hg Se…”

Section: Effecto Fw O 3 Interlayer On Durability and Rate Performancementioning

confidence: 96%

Metal Oxide Interlayer for Long‐Lived Lithium–Selenium Batteries

Mukkabla

Kuldeep

Krushnamurty

et al. 2018

Chemistry A European J

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A lithium–selenium (Li‐Se)‐alkali activated carbon hybrid cell with a tungsten oxide interlayer is implemented for the first time. The Se hybrid at a Se loading of 70 % in the full Li–Se cell delivers a large reversible capacity of 625 mA h gSe−1, in comparison with 505.8 mA h gSe−1 achieved for the pristine Se cell. This clearly shows the advantage of the carbon in improving the capacity of the Li‐Se cell. A tungsten oxide interlayer is drop‐cast over the battery separator to further circumvent the issues of polyselenide dissolution and shuttle, which cause severe capacity fading. The oxide layer conducts Li ions, as evidenced from the Li‐ion diffusion coefficient of 4.2×10−9 cm2 s−1, and simultaneously blocks the polyselenide crossover, as it is impermeable to polyselenides, thereby reducing the capacity fading with cycling. The outcome of this unique approach is reflected in the reversible capacities of 808 and 510 mA h gSe−1 achieved for the Li‐oxide@separator/Se‐alkali activated carbon cell before and after 100 cycles, respectively, thus demonstrating that carbon and oxide can efficiently restrict the capacity fading and improve the performances of Li‐Se cells.

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“…9). 52 In addition, despite the sintering shrinkage of 60%-70%, the sintered materials well maintained their primary architectures without substantial distortion (inset of Fig. 3d), allowing us to design the dimensions and shapes of TE materials with the pre-computer-aided design.…”

Section: D Printing Of Cu 2 Se Te Materialsmentioning

confidence: 99%

Cu2Se-based thermoelectric cellular architectures for efficient and durable power generation

Choo

Ejaz

et al. 2021

Preprint

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Thermoelectric (TE) power generation offers a promising way to recover waste heat. The geometrical design of TE legs in modules is important to ensure sustainable power generation but cannot be easily achieved by traditional fabrication processes. Herein, we propose the design of cellular TE architectures for efficient and durable power generation, realized by the extrusion-based 3D printing process of Cu2Se TE materials. We designed the optimum aspect ratio of a cuboid TE leg to maximize the power output and extended this design to the mechanically stiff cellular architectures of hollow hexagonal column- and honeycomb-based TE legs. Moreover, we developed organic binder-free Cu2Se-based 3D-printing inks with desirable viscoelasticity, tailored with an additive of inorganic Se82- polyanion, fabricating the designed topologies. The computational simulation and experimental measurement demonstrated the superior power output and mechanical stiffness of the proposed cellular TE architectures to other designs, unveiling the importance of topological designs of TE legs toward higher power and longer durability.

show abstract

Hollow selenium encapsulated into 3D graphene hydrogels for lithium–selenium batteries with high rate performance and cycling stability

Abstract: Hollow selenium nanospheres encapsulated within 3D graphene hydrogels were prepared and researched as Li–Se battery cathode materials. It was shown that the hollow Se structure and 3D graphene were beneficial to the application Li–Se batteries.

Cited by 18 publications

References 30 publications

Cu2Se-based thermoelectric cellular architectures for efficient and durable power generation

Cu2Se-based thermoelectric cellular architectures for efficient and durable power generation

Metal Oxide Interlayer for Long‐Lived Lithium–Selenium Batteries

Cu2Se-based thermoelectric cellular architectures for efficient and durable power generation

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