12 research outputs found
Morphology control and fabrication of multi-shelled NiO spheres by tuning the pH value via a hydrothermal process
No full textInternational audienc
Three-dimensional alloy interface between Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> and Li metal to achieve excellent cycling stability of all-solid-state battery
No full textThe interfacial issues between garnet electrolyte and Li metal hinder the application of garnet electrolyte in solid-state Li metal batteries. Herein, a three-dimensional (3D) porous Zn layer (PZL) is magnetron sputtered on the surface of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) to construct a 3D Li–Zn alloy layer at the LLZTO/Li interface by melting Li metal into PZL. The 3D Li–Zn alloy effectively reduces the LLZTO/Li interfacial impedance from 319.8 Ω cm2 to an extremely low value of 1.9 Ω cm2. Meanwhile, the 3D alloy skeleton can enhance the transport kinetics and promote uniform distribution of Li ion at interface to inhibit the growth of Li dendrites. More importantly, the volume expansion of interface between LLZO and Li metal anode is effectively suppressed due to the host role of 3D Li–Zn alloy interface. The Li/LLZTO@PZL/Li symmetrical battery achieves a high critical current density of 2 mA cm−2 for one cycle. The all-solid-state LiNi0.5Co0.2Mn0.3O2 (NCM523)/LLZTO@PZL/Li battery with a high cathode loading of 4.9 mg cm−2 delivers a high specific capacity of 143.8 mAh g−1 after 170 cycles. The 3D alloy interface is significant for enhancing the interfacial stability of high capacity all-solid-state lithium metal batteries.</p
Nanowire Upgrading Polyethylene Oxide (PEO) Composite Electrolyte and PEO Cathode Binder (Adv. Funct. Mater. 1/2019)
No full textOptimising lithium lanthanum cerate garnet ceramic electrolytes for fast lithium-ion conduction
No full textFunding: China Sponsorship Council (202008060056); Engineering and Physical Sciences Research Council (EP/T019298/1, EP/R023751/1); Science & Technology Facilities Council Central Laser Facility (XB2190187); The Faraday Institution (FIRG 031).The garnet-type electrolytes are promising for solid-state lithium-metal batteries, while it is still challenging to realize fast lithium-ion conduction with moderate sintering process. To solve the problem, we proposed a novel cerium (Ce)-based cubic garnet electrolyte – Li6.25La3Ce1.25Ta0.75O12 (LLCTO-0.75). The Ta5+ doping of the tetragonal Li7La3Ce2O12 (LLCO) results in a stable cubic phase at room temperature, whilst the presence of Ce4+ is associated with enlarging lattice parameters to facilitate lithium-ion migration and promoting sintering. As a result, the LLCTO-0.75 achieves a dense ceramic microstructure with only 30 min sintering at 1150 °C, and an outstanding lithium-ion conductivity of 1.09 mS cm−1 at 30 °C. Benefiting from a small Li/LLCTO-0.75 interfacial resistance of 52.8 Ω cm2 at 30 °C, the Li-Li symmetric cell cycles for over 700 h without short circuit, and the quasi-solid state LiFePO4/LLCTO 0.75/Li battery delivers a satisfying specific capacity of 127.0 mAh g−1 after 300 cycles. This work provides new insights into the development of practical solid-state oxide electrolytes for safe high-energy batteries.Peer reviewe
Valence state and defect modulation in reduced Sr-site deficient Pt/Sr<sub>0.95</sub>Ti<sub>0.9</sub>Cr<sub>0.1</sub>O<sub>3-δ</sub> perovskite for enhanced photocatalytic hydrogen production
No full textAs the global energy landscape shifts to a green hydrogen economy, efficient and stable visible-light photocatalysts are increasingly central to optimizing solar-to-hydrogen conversion. Here, a Sr-site-deficient perovskite photocatalyst (R-Pt/Sr0.95Ti0.9Cr0.1O3-δ) was synthesised by a solid-state method, followed by Pt impregnation and hydrogen reduction post treatment. The introduction of A-site deficiency effectively tunes the band structure and facilitates hydrogen evolution, doubling activity compared to stoichiometric analogs. Besides, A-site deficiency reduces overall cation charge and promotes Cr4+ formation. Through spectroscopy and thermal analysis, Cr4+ was identified in the Sr0.95Ti0.9Cr0.1O3-δ perovskite, revealing unexplored oxidation state dynamics. Upon reduction, Cr4+ converts to Cr3+, creating oxygen vacancies and eliminating hole-trap sites. The resulting synergistic active sites greatly boost photocatalytic hydrogen evolution. Specifically, the R-Pt/Sr0.95Ti0.9Cr0.1O3-δ achieved 120.46 μmol/gcat/h under full spectrum and 68.66 μmol/gcat/h under visible light (λ ≥ 420 nm), representing twice and 5 times enhancements relative to stoichiometric R-Pt/SrTi0.9Cr0.1O3-δ and unreduced Pt/Sr0.95Ti0.9Cr0.1O3-δ in visible light separately. This work demonstrates that combining A-site engineering and valence-state modulation provide a helpful strategy for designing high-performance visible-light photocatalysts
Nanowire Upgrading Polyethylene Oxide (PEO) Composite Electrolyte and PEO Cathode Binder
No full text
In Situ Construction of an Ultra‐Stable Conductive Composite Interface for High‐Voltage All‐Solid‐State Lithium Metal Batteries
No full textIn Situ Construction of an Ultra‐Stable Conductive Composite Interface for High‐Voltage All‐Solid‐State Lithium Metal Batteries
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