A maricite hybrid cathode of NaFePO4/C/graphene with a novel microstructure is produced by a modified ball-milling process based on a solid-state reaction. This structure is capable of delivering high sodium storage capacity with outstanding cycle stability.
With a low cost and high volumetric capacity, rechargeable magnesium batteries (RMBs) have emerged as promising candidates for post-lithium ion batteries. The kinetically sluggish Mg 2+ insertion/ extraction in the host lattice and the anode/electrolyte incompatibility render the battery irreversible in some instances and restrict the commercial applications. In this work, we replace the conventional electrolyte with a dual layer of liquid and polymer electrolyte onto the cathode and anode, respectively, and investigate the structural, electrical, and electrochemical properties. It exhibits a remarkable Mg-ion conductivity up to 4.62 × 10 −4 S cm −1 at 55 °C, a high transfer number (t Mg 2+ = 0.74), low overpotential, and relatively stable Mg stripping and plating during the initial cycles. Furthermore, this work uses an unconventional electrode, BaTiO 3 (BTO), to demonstrate the performance of Mg batteries and track the structural and electrochemical changes. The quasi-solid-state Mg batteries fabricated with premagnesiation and thermally treated BTO cathode materials show good electrochemical performance. The approaches herein may provide new directions for exploiting high-performance Mg batteries through the perovskite structure cathode and functional dual electrolyte.
Synchronously engineering the interface compatibility of the anode and the cathode in a Li–polysulfide electrolyte enables a full cell design with improved safety, durability and performance.
Zero thermal expansion (ZTE) is a rare physical property; however, if accessible, these ZTE or near ZTE materials can be widely applied in electronic devices and aerospace engineering in addition to being of significant fundamental interest. ZTE materials illustrate this property over a certain temperature range. Here, orthorhombic (Pnca space group) Sc 1.5 Al 0.5 W 3 O 12 is demonstrated to deliver ZTE over the widest temperature reported to date, from 4 to 1400 K, with a coefficient of thermal expansion of α v = −6(14) × 10 −8 K −1 . Sc 1.5 Al 0.5 W 3 O 12 maybe is one of the most thermally stable materials known based on the temperature range of stability and the consistent thermal expansion coefficients observed along the crystallographic axes and volumetrically. Furthermore, this work demonstrates the atomic perturbations that lead to ZTE and how varying the Sc:Al ratio can alter the coefficient of thermal expansion.
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