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Ultrasensitive Field‐Effect Biosensors Enabled by the Unique Electronic Properties of Graphene
摘要： Using Li metal-free anodes for lithium-ion oxygen and lithium-ion sulfur batteries is considered as a promising solution to resolve the hazard of Li metal anode. Although Si anode exhibits high capacity and low electrochemical potential, it cannot match with oxygen (or sulfur) cathode, because both lack cycleable lithium ions. In this work, a free-standing and fibrous Si/C anode is prepared by electrospinning and its simple but effective lithiation is proposed. When assembling the cells, the free-standing Si/C anode was put between mass-controlled lithium metal foil and separator, and then the Si/C anode could be lithiated after adding electrolytes. By optimizing a LiFSI based ether electrolyte, the Si/C anode could achieve good cycleablity comparable to that in carbonate electrolytes. The lithiated SieO2 cells exhibit better cycling stability than the lithium oxygen cells with gel polymer electrolye. Moreover, because both Si anode and S@pPAN cathode are compatible with carbonate electrolytes, exceptional cycling performance has been achieved for the lithiated SieS cells. This simple method could pave the way to commercial applications of lithium-ion oxygen and lithium-ion sulfur batteries.
关键词： Lithium-sulfur battery,Lithium-oxygen battery,LieSi alloy anode,In-situ lithiation,Fibrous Si/C anode
更新于2025-09-19 17:13:59
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A Hierarchical Three-Dimensional Porous Laser-Scribed Graphene Film for Suppressing Polysulfide Shuttling in Lithiuma??Sulfur Batteries
摘要： Lithium-sulfur (Li-S) battery is a promising next-generation rechargeable battery with high energy density. Given the outstanding capacities of sulfur (1675 mAh g?1) and lithium metal (3861 mAh g?1), Li-S battery theoretically delivers an ultra-high energy density of 2567 Wh kg?1. However, this energy density cannot be realized due to several factors, particularly the shuttling of polysulfide intermediates between the cathode and anode, which causes serious degradation of capacity and cycling stability of a Li-S battery. In this work, a simple and scalable route was employed to construct a free-standing laser scribed graphene (LSG) interlayer which effectively suppresses the polysulfide shuttling in Li-S batteries. Thus, a high specific capacity (1160 mAh g-1) with excellent cycling stability (80.4% capacity retention after 100 cycles) has been achieved due to the unique structure of hierarchical three-dimensional pores in the free-standing LSG.
关键词： High-capacity,Lithium-sulfur battery,Graphene,Polysulfide shuttling,Interlayer,Laser Scribed Graphene
更新于2025-09-19 17:13:59
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Understanding Interactions between Lead Iodide Perovskite Surfaces and Lithium Polysulfide toward New-Generation Integrated Solar-Powered Lithium Battery: an ab-Initio Investigation
摘要： Energy conversion devices such as perovskite solar cells and energy storage devices such as lithium sulfur battery flourish in these decades owing to their capabilities to deliver large power conversion efficiency and store superior specific energy, with potentials to solve the global energy crisis and environmental issues. Compared with conventional energy conversion devices and energy storage devices that have limited performances, integrating the energy conversion devices and energy storage devices into a single unit is advantageous to present enhanced performance in multiple applications and satisfy the commercial needs. However, further development of the integration relies on a deeper understanding of the interactions between the functional materials in the energy conversion devices and energy storage devices. In this study, we try to bridge the gap by investigating the interactions between the light absorbing halide perovskite material CH3NH3PbI3 and the lithium polysulfide intermediates (S8, Li2S8, Li2S6, Li2S4, Li2S2 and Li2S) formed during the charging/discharging processes in lithium sulfur batteries via ab-initio calculations. We find that the CH3NH3PbI3 and lithium polysulfide species have decent interactions, with the lithium polysulfide species residing stably on the halide perovskite surfaces and such interactions are strengthened by the charge transfer characters between the adsorbates and the adsorbents. We propose that the light absorbing halide perovskite materials represented by the CH3NH3PbI3 absorber exhibit potentials to be integrated into the lithium sulfur battery cathode to serve as an anchoring material to harness the solar power and mitigate the battery degradation problem, since the dissolution of intermediate lithium polysulfide (Li2Sn) is a severe problem in lithium sulfur batteries. The resulting integrated device is superior in capturing the solar energy due to the presence of the halide perovskite moiety and exhibits a large specific energy, low cost and low toxicity due to the sulfur materials. The comprehensive understanding of the light absorbing halide perovskite material and the lithium polysulfide species in this theoretical work forms a foundation for the further development and commercialization of integrated device that captures solar energy and can be charged/discharged efficiently.
关键词： perovskite solar cells,energy storage,energy conversion,integrated device,lithium polysulfide,lithium sulfur battery,ab-initio calculations,CH3NH3PbI3
更新于2025-09-04 15:30:14