Vanadium disulfide flakes with nanolayered titanium disulfide coating as cathode materials in lithium-ion batteries

Li, Lü; Li, Zhaodong; Yoshimura, Anthony; Sun, Congli; Wang, Tianmeng; Chen, Yanwen; Chen, Zhizhong; Littlejohn, Aaron J.; Xiang, Yu; Hundekar, Prateek; Bartolucci, Stephen F.; Shi, Jian; Shi, Su‐Fei; Meunier, Vincent; Wang, G.-C.; Koratkar, Nikhil

doi:10.1038/s41467-019-09400-w

Cited by 86 publications

(60 citation statements)

References 49 publications

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“…In situ TEM has been widely applied to reveal the underlying mechanisms of rechargeable batteries, including LIBs, Li–O 2 batteries, Li–S batteries, lithium metal batteries, sodium‐ion batteries, sodium–O 2 batteries, and Li–Se batteries …”

Section: Energy Storagementioning

confidence: 99%

Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials

et al. 2019

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replacing gasoline, diesel, or other types of fuels with electricity, it is expected that our world will become more environmentally friendly by storing energy directly from sustainable sources, such as solar, wind, geothermal, bioenergy, and the ocean. Even Australia, as a country with abundant energy resources, has identified energy as one of the key scientific research priorities. It is clear that the efficiency of energy harvesting and consumption must be improved, emissions must be reduced, and the integration of various energy sources into the electricity grid and chemical storage must be implemented. A desirable outlook is one with a variety of energy sources and mechanisms that significantly reduces carbon emissions and is economical for consumers and society. Recent fast-growing research should boost the development of reliable, highly efficient, low-cost, and sustainable energy materials that are effective for new technologies and that satisfy the growing demand for energy storage and climate change solutions.The progress in energy materials is indeed significant, however, as the expectations of energy materials research are always quite high, it is not sufficient. Particularly, the material performances are always theoretically predicted but are limited by the underlying mechanisms in real applications. As a wellknown example, silicon is expected to deliver a high theoretical capacity of 4200 mAh g −1 in the form of Li 4.4 Si, and is thought to replace the currently commercial graphite with a capacity of 372 mAh g −1 . However, in real applications, it is found that Si exhibits more than 360% of volume expansion during lithiation, which leads to battery anode failure. In the last few years, TEM, especially in situ TEM, has provided exceptional advantages in investigating the lithiation process of silicon anodes: direct imaging, full crystallography information, and real-time recording have all become possible. By directly observing the charge/discharge processes of Si anodes, the dynamics of expansion have been well understood. The research has then been focused on structural designs of composites containing Si to overcome the expansion. The Si composites (for instance, carbon-wrapped Si nanoparticles with different sizes) were directly analyzed by in situ TEM to determine the best structural design. [12] From 2012, in situ TEM became an essential tool to review and evaluate structural designs for high-capacity anodes with significant volume expansions. The same scenarios apply to similar research topics. In situ transmission electron microscopy (TEM) is one of the most powerfulapproaches for revealing physical and chemical process dynamics at atomic resolutions. The most recent developments for in situ TEM techniques are summarized; in particular, how they enable visualization of various events, measure properties, and solve problems in the field of energy by revealing detailed mechanisms at the nanoscale. Related applications include rechargeable batteries such as Li-ion, Na-ion, Li-O 2 , Na-O 2 , Li...

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Section: Energy Storagementioning

confidence: 99%

Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials

et al. 2019

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“…Using the first-principles density functional theory calculations, Wang et al reported that a monolayer VS 2 can absorb three layers of Li-ion, producing a high theoretical capacity of 1397 mAh g −1 [21] , which makes VS 2 a promising electrode material for LIBs. However, VS 2 -based electrodes suffer from low reversible capacity and poor cycling stability mainly related to the volume variations generated during the charge/discharge processes [22,23] . In order to buffer the volume variations for improving the stability, VS 2 is incorporated with mechanically resilient carbon materials or transition metals to form composites [22][23][24] .…”

Section: Introductionmentioning

confidence: 99%

“…However, VS 2 -based electrodes suffer from low reversible capacity and poor cycling stability mainly related to the volume variations generated during the charge/discharge processes [22,23] . In order to buffer the volume variations for improving the stability, VS 2 is incorporated with mechanically resilient carbon materials or transition metals to form composites [22][23][24] . For instance, Fang et al reported that VS 2 @graphene nanosheets could deliver a high reversible capacity of 528 mAh g −1 after 100 cycles at 200 mA g −1 [23] .…”

Section: Introductionmentioning

confidence: 99%

“…Ding et al showed that VS 2 nanosheets coated with PEDOT-PSS displayed a capacity of 569.0 mAh g −1 at 100 mA g −1 after 100 cycles [24] . Li et al reported that titanium disulfide coated VS 2 offered a more stable electrochemical performance than pure VS 2 [22] . Cao et al developed the TiO 2 -B@VS 2 with a reversible capacity of 365.4 mAh g −1 after 500 cycles at 335 mA g −1 [25] .…”

Section: Introductionmentioning

confidence: 99%

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Porous bowl-shaped VS2 nanosheets/graphene composite for high-rate lithium-ion storage

Wang

et al. 2020

Journal of Energy Chemistry

165

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“…Modern human society cannot flourish without an efficient, affordable and safe means for energy storage. Presently, Lithium (Li) -ion batteries (LIBs) are dominating the energy storage landscape from portable electronics and grid storage to the rapidly expanding electric vehicles market 1,2,3,4,56 . As the range of applications of LIBs expand, it is becoming increasingly clear that the traditional LIB chemistry (i.e., the graphite anode and transition metal oxide cathode) is not well-suited in many situations 7,8,9,10 .…”

Section: Introductionmentioning

confidence: 99%

Alloying of Alkali Metals with Tellurene

Jain

Yuan

Singh

et al. 2020

Preprint

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Graphite is ubiquitous as the anode material in lithium-ion batteries, but offers relatively low volumetric capacity (330 to 430 mAh cm-3). By contrast, Tellurene (Te) is expected to alloy with alkali metals with high volumetric capacity (~2620 mAh cm-3), but to date there is no detailed study on its alloying behavior. In this work, we have investigated the alloying response of a range of alkali metals (A = Li, Na or K) with few-layer Te. In-situ transmission electron microscopy and density functional theory both indicate that Te alloys with alkali metals forming A2Te. However, the crystalline order of alloyed products varied significantly from single-crystal (for Li2Te) to polycrystalline (for Na2Te and K2Te). It is well established that typical alloying materials (e.g., silicon, tin, black phosphorous) lose their crystallinity when reacted with Li. The ability of Te to retain its crystallinity is therefore surprising. Nudged elastic band calculations and ab-initio molecular dynamics simulations reveal that compared to Na or K, the migration of Li is highly “isotropic” in Te, enabling its crystallinity to be preserved. Such isotropic Li transport is made possible by Te’s peculiar structure comprised of chiral chains bound by van der Waals forces. To evaluate the electrochemical performance of Te, we tested Te electrodes in half-cells vs Li/Na/K metal. While alloying with Na and K showed poor performance, with Li, the Te electrode exhibited a volumetric capacity of ~700 mAh cm-3, which is about two-times the practical capacity of commercial graphite. Such Te based batteries could play an important role in applications where high volumetric energy and power density are of paramount importance.

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Vanadium disulfide flakes with nanolayered titanium disulfide coating as cathode materials in lithium-ion batteries

Cited by 86 publications

References 49 publications

Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials

Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials

Porous bowl-shaped VS2 nanosheets/graphene composite for high-rate lithium-ion storage

Alloying of Alkali Metals with Tellurene

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