Amorphous TiO2 nanofilm interface coating on mesoporous carbon as efficient sulfur host for Lithium–Sulfur batteries
TL;DR: In this article, a novel sulfur host composed of amorphous TiO2 nanofilm interfaces coating on mesoporous carbon by controlling the hydrolytic process of tetrabutyl titanate on the surface of 3D interconnect conductive carbon matrix is presented.
About: This article is published in Electrochimica Acta.The article was published on 2020-02-01. It has received 26 citations till now. The article focuses on the topics: Lithium & Sulfur.
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TL;DR: In this article, a 3D hierarchical Ni(OH)2 nanosheet-based composite structure for Li-S battery has been proposed to improve the performance of LiS battery.
39 citations
TL;DR: In this paper , a type of V2O5-x/TiO2 active interface structure with high polysulfide adsorption energy was designed as a high-performance sulfur-wrapped matrix.
29 citations
TL;DR: The present Fe2O3/Fe@N-GC composite with an easy fabrication method and high sensitivity, selectivity, stabitliy towards NO2 at RT would inspire various designs based on the 3D honeycomb structure for more real applications in gas sensors.
28 citations
TL;DR: In this article , a hierarchical N, P codoped porous 3D-carbon framework@TiO2 nanoparticle hybrid anode was synthesized by using pollen as biomass precursor through a facile template assisted sol-gel methode and exhibits hierarchical porous hollow structure with plenty of redox active sites and enhanced specific surface area.
27 citations
TL;DR: In this paper, a hierarchical N, P codoped porous 3D-carbon framework@TiO2 nanoparticle hybrid anode was synthesized by using pollen as biomass precursor through a facile template assisted sol-gel methode and exhibits hierarchical porous hollow structure with plenty of redox active sites and enhanced specific surface area.
27 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: 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: Li-S batteries have received everincreasing attention recently due to their high theoretical specific energy density, which is 3 to 5 times higher than that of Li ion batteries based on intercalation reactions as discussed by the authors.
Abstract: Rechargeable Li–S batteries have received ever-increasing attention recently due to their high theoretical specific energy density, which is 3 to 5 times higher than that of Li ion batteries based on intercalation reactions. Li–S batteries may represent a next-generation energy storage system, particularly for large scale applications. The obstacles to realize this high energy density mainly include high internal resistance, self-discharge and rapid capacity fading on cycling. These challenges can be met to a large degree by designing novel sulfur electrodes with “smart” nanostructures. This highlight provides an overview of major developments of positive electrodes based on this concept.
1,731 citations
TL;DR: It is shown that the problem of sulfur loss can be effectively diminished by controlling the sulfur as smaller allotropes in the confined space of a conductive microporous carbon matrix.
Abstract: The lithium–sulfur battery holds a high theoretical energy density, 4–5 times that of today’s lithium-ion batteries, yet its applications have been hindered by poor electronic conductivity of the sulfur cathode and, most importantly, the rapid fading of its capacity due to the formation of soluble polysulfide intermediates (Li2Sn, n = 4–8). Despite numerous efforts concerning this issue, combatting sulfur loss remains one of the greatest challenges. Here we show that this problem can be effectively diminished by controlling the sulfur as smaller allotropes. Metastable small sulfur molecules of S2–4 were synthesized in the confined space of a conductive microporous carbon matrix. The confined S2–4 as a new cathode material can totally avoid the unfavorable transition between the commonly used large S8 and S42–. Li–S batteries based on this concept exhibit unprecedented electrochemical behavior with high specific capacity, good cycling stability, and superior rate capability, which promise a practicable bat...
1,443 citations
TL;DR: This work reports a different strategy based on an inherently polar, high surface area metallic oxide cathode host and shows that it mitigates polysulphide dissolution by forming an excellent interface with Li2S and provides experimental evidence for surface-mediated redox chemistry.
Abstract: In lithium-sulfur batteries, many porous conductive carbon materials are proposed to confine soluble polysulfides, but the efficiency is generally low. Here, the authors use a Magneli phase of titanium oxide as the cathode host and electron conduit, which binds the lithium (poly)sulfides well, leading to excellent battery performance.
1,090 citations