Rational design of self-supporting graphene - Polypyrrole/sulfur - Graphene sandwich as structural paper electrode for lithium sulfur batteries
TL;DR: In this article, a free-standing paper electrode was used as cathode material for Li-S batteries, which is a binder-free graphene-polypyrrole (PPy)/S-graphene (G-PPy/S-G) structural electrode was prepared by using the vacuum filtration method.
About: This article is published in Journal of Alloys and Compounds.The article was published on 2017-12-25. It has received 26 citations till now. The article focuses on the topics: Polysulfide & Electrochemical cell.
Citations
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TL;DR: In this paper, the authors summarize the recent progress on the binders for Li-S batteries and discuss the various routes, including the binder combination use, functionalization, in-situ polymerization and ion cross-linking, etc., to enhance their performance in stabilizing the cathode, building the high sulfur loading electrode and improving the cyclic stability.
65 citations
58 citations
TL;DR: In this article, the authors present the fundamental studies and current development trends of common electronically conducting polymers in various components of Li-S/Se batteries, which involves polyaniline (PANI) polypyrrole (PPy), and polythiophene (PTh) with its derivatives, e.g. polyethoxythiophene(PEDOT) and poly(3,4-ethylenedioxyntiophene)-poly(styrenesulfonate) (PSS).
52 citations
TL;DR: In this article, a CoSe@NC nanofiber membrane was prepared by electrospinning method and used as independent functional interlayer for Li-S batteries to accelerate the conversion of polysulfides.
39 citations
TL;DR: Li et al. as mentioned in this paper summarized the recent application of graphene-based materials, including simple graphene and graphenebased nanocomposites, as modifying interlayers in Li S batteries and discussed the strategies to enhance their electrochemical performance.
37 citations
References
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TL;DR: The energy that can be stored in Li-air and Li-S cells is compared with Li-ion; the operation of the cells is discussed, as are the significant hurdles that will have to be overcome if such batteries are to succeed.
Abstract: Li-ion batteries have transformed portable electronics and will play a key role in the electrification of transport. However, the highest energy storage possible for Li-ion batteries is insufficient for the long-term needs of society, for example, extended-range electric vehicles. To go beyond the horizon of Li-ion batteries is a formidable challenge; there are few options. Here we consider two: Li-air (O(2)) and Li-S. The energy that can be stored in Li-air (based on aqueous or non-aqueous electrolytes) and Li-S cells is compared with Li-ion; the operation of the cells is discussed, as are the significant hurdles that will have to be overcome if such batteries are to succeed. Fundamental scientific advances in understanding the reactions occurring in the cells as well as new materials are key to overcoming these obstacles. The potential benefits of Li-air and Li-S justify the continued research effort that will be needed.
7,895 citations
TL;DR: In this paper, the authors report the feasibility to approach such capacities by creating highly ordered interwoven composites, where conductive mesoporous carbon framework precisely constrains sulphur nanofiller growth within its channels and generates essential electrical contact to the insulating sulphur.
Abstract: The Li-S battery has been under intense scrutiny for over two decades, as it offers the possibility of high gravimetric capacities and theoretical energy densities ranging up to a factor of five beyond conventional Li-ion systems. Herein, we report the feasibility to approach such capacities by creating highly ordered interwoven composites. The conductive mesoporous carbon framework precisely constrains sulphur nanofiller growth within its channels and generates essential electrical contact to the insulating sulphur. The structure provides access to Li+ ingress/egress for reactivity with the sulphur, and we speculate that the kinetic inhibition to diffusion within the framework and the sorption properties of the carbon aid in trapping the polysulphides formed during redox. Polymer modification of the carbon surface further provides a chemical gradient that retards diffusion of these large anions out of the electrode, thus facilitating more complete reaction. Reversible capacities up to 1,320 mA h g(-1) are attained. The assembly process is simple and broadly applicable, conceptually providing new opportunities for materials scientists for tailored design that can be extended to many different electrode materials.
5,151 citations
TL;DR: In this article, the synthesis of a graphene-sulfur composite material by wrapping poly(ethylene glycol) (PEG) coated submicrometer sulfur particles with mildly oxidized graphene oxide sheets decorated by carbon black nanoparticles was reported.
Abstract: We report the synthesis of a graphene–sulfur composite material by wrapping poly(ethylene glycol) (PEG) coated submicrometer sulfur particles with mildly oxidized graphene oxide sheets decorated by carbon black nanoparticles. The PEG and graphene coating layers are important to accommodating volume expansion of the coated sulfur particles during discharge, trapping soluble polysulfide intermediates, and rendering the sulfur particles electrically conducting. The resulting graphene–sulfur composite showed high and stable specific capacities up to ∼600 mAh/g over more than 100 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density.
2,013 citations
TL;DR: This work demonstrates the design of a sulphur-TiO(2) yolk-shell nanoarchitecture with internal void space to accommodate the volume expansion of sulphur, resulting in an intact TiO( 2) shell to minimize polysulphide dissolution.
Abstract: The practical performance of lithium–sulphur batteries is lower than expected because of polysulphide dissolution into the electrolyte over time. Seh et al. show that a yolk–shell nanoarchitecture is able to encapsulate sulphur cathode materials efficiently and thus allows over 1,000 charge/discharge cycles.
1,904 citations
TL;DR: A coulombic efficiency nearing 100% and long cycling stability are achieved, and the advantage of this electrolyte is further demonstrated that lithium polysulphide dissolution is inhibited, thus overcoming one of today's most challenging technological hurdles.
Abstract: Commercial lithium-ion batteries normally use a liquid electrolyte. Suo et al. show that a glassy-like electrolyte containing a high concentration of lithium salt leads to a substantially enhanced battery performance because of suppressed formation of lithium dendrites on the lithium metal anodes.
1,892 citations