Two-dimensional transition metal dichalcogenides (2D TMDs) have gained great interest due to their unique tunable bandgap as a function of the number layers. Especially, single-layer tungsten disulfides (WS2) is direct band gap semiconductor with 2.1 eV featuring strong photoluminescence and large exciton binding energy. Although synthesis MoS2 layer dependent properties been studied rigorously, little attention has paid formation WS2 its properties. Here we report scalable uniform film by...

Rapidly increasing markets for electric vehicles (EVs), energy storage backup support systems and high-power portable electronics demand batteries with higher densities longer cycle lives. Among the various electrochemical systems, lithium-sulfur (Li-S) have potential to become next generation rechargeable because of their high specific at low cost. However, development practical Li-S commercial products has been challenged by several obstacles, including unstable life sulfur utilization....

Carbon nanomaterials-based electric double-layer capacitors (EDLCs) are reliable and appealing energy-storage systems offering high power density long cycling stability. However, these energy storage devices plagued with critical shortcomings, such as low specific capacitance, inefficient physical/chemical activation process, self-discharge of electrode materials, hindering their future application. In this work, we use a self-activation an environmentally benign low-cost to produce...

Flexible lithium-ion batteries (LIBs) have received considerable attention as energy sources for wearable electronics. In recent years, much effort has been devoted to study light-weight, robust, and flexible electrodes. However, high areal volumetric capacities need be achieved practical power densities. this paper, we report the use of three-dimensional (3D) free-standing carbon nanotubes (CNTs) a current collector-free anode demonstrate LIBs with enhanced capacities. High density CNTs...

The advent of advanced electrode materials has led to performance enhancement traditional lithium ion batteries (LIBs). We present novel binder-free MoS2 coated three-dimensional carbon nanotubes (3D CNTs) as an anode in LIBs. Scanning transmission electron microscopy analysis shows that vertically oriented nanoflakes are strongly bonded CNTs, which provide a high surface area and active electrochemical sites, enhanced conductivity at the interface. very areal capacity ~1.65 mAh cm-2 with...

Often touted as the most promising next-generation energy storage systems, lithium (Li) metal batteries have drawn extensive interest due to their densities beyond those of Li-ion batteries. The use Li metal, however, presents a major hurdle since it is susceptible dendrite growths, corrosive interfacial reactions, and uncontrolled volume changes. Li-metal protection an important issue in overcoming challenges. In particular, studies shown that molybdenum disulfide (MoS 2 ) can significantly...

Abstract Although lithium‐metal‐based batteries (LMBs) offer one of the highest energy densities, issues with Li dendrite growths and chemical reactivity between electrolytes limit their applications. To enable a stable LMB under practical conditions lean electrolyte, thin metal high mass loading, we introduce an efficient protective coating MoS 2 onto Li‐metal anode analyzed its electrochemical performance condition. The successfully stabilizes activity surface by preventing growth...

The high theoretical specific capacity of nickel oxide (NiO) makes it attractive as a high-efficiency electrode material for electrochemical energy storage. However, its application is limited due to inferior performance and complicated fabrication process. Here, we developed an in situ graphene-coated, three-dimensional (3D) NiO-Ni structure by simple chemical vapor deposition (CVD). We synthesized NiO layers on Ni foam through thermal oxidation process; subsequently, grew graphene directly...

Carbon nanostructural materials have gained the spotlight as promising anode for energy storage; they exhibit unique physico-chemical properties such large surface area, short Li+ ion diffusion length, and high electrical conductivity, in addition to their long-term stability. However, carbon-nanostructured issues with low areal volumetric densities practical applications electric vehicles, portable electronics, power grid systems, which demand higher densities. One approach overcoming these...

Sulfur as a cathode material is well-known candidate for next generation Li metal-based batteries. However, the intrinsic limitations associated with low conductivity of sulfur and instability metal anode prevents commercialization lithium Many researches have studied design to improve electrochemical performance. not many emphasized on high minimal electrolyte loadings compete against currently available Li-ion Here, we use binder-free three-dimensional carbon nanotubes (3D CNTs)/sulfur (S)...

Lithium–sulfur (Li–S) batteries are considered the promising energy-storage devices to replace aging lithium-ion batteries. Indeed, they have gained much attention in both academia and industry due their high theoretical energy density. Although significant progress has been achieved field of academia, same thing cannot be stated for commercial production Li–S This is evidenced by fact that only a few studies demonstrated pouch-cell approach. Thus, it important realize gap between academic...

Rechargeable Li-S batteries represent advanced battery system offering high energy density with low cost cathode material compared to currently available Li-ion batteries. The critical limitations are mainly associated the insulating nature of sulfur (5 x 10-30 S/m), and shuttle effect involving polysulfides (Li2Sx; 2<x<8) during charge/discharge process resulting in capacity fading cycling stability. Most previous strategies suggest entrapment these considering areal be less than 2mg/cm2....

삼성분 칼코게나이드 화합물인 황화 주석 저마늄 (<TEX>$Sn_xGe_{1-x}S$</TEX>) 합금 나노입자를 메틸 <TEX>$(Sn(CH_3)_4$</TEX>, tetramethyl tin, TMT) <TEX>$(Ge(CH_3)_4$</TEX>, germanium, TMG), 황화수소 (<TEX>$H_2S$</TEX>, hydrogen sulfide) 혼합 가스의 레이저 광분해 반응법으로 합성할 수 있으며, 이때 반응기 안의 가스 혼합비율에 따라 나노입자의 주석과 저마늄의 조성비를 조절할 있었다. 가변시킨 나노입자는 모두 결정성을 갖게 만들 있었으며, 리튬 이온 전지의 음극소재로서 우수한 특성을 보여주었다. 조성비에 조사결과, 황화저마늄은 70 사이클 후 최대 1200 mAh/g의 가장 높은 방전용량을 갖는 것과, 성분 함량이 클수록 충방전률에서 용량 유지가 더 잘 됨을 확인하였다. 이와 같은 효율의 황화물 새로운 대량 합성법은 고성능 에너지 변환 소재 실용화에 기여할...

The increasing demand for high efficiency large-scale energy storage applications (e.g. electric vehicles) has led to an expansion in new developmental efforts energy-density lithium-ion batteries. However, commercial graphite anodes based on conventional intercalation reaction (involving insertion or extraction of Li ions into from a layer-type crystal structure) have been faced with low theoretical specific capacity which prevents them being applied advanced storages. Transition metal...

Lithium (Li) metal electrodes are widely regarded as the promising anodes since their energy densities far exceed those of lithium-intercalated carbon anode materials. However, Li plagued with dendrite formation and electrolyte incompatibility that limits lifespan stability within any battery systems employ them. A way to resolve limitations involves use passivating layers protect surface metal. This study will explore mechanism behind passivation surface; it also discover how coating...