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| 1 | Ag Nanoparticles Anchored on Nanoporous Ge Skeleton as High-Performance Anode for Lithium-ion Batteries显示文摘Main observation and conclusion Nanoporous(NP)Ge/Ag composite is controllably fabricated via one simple dealloying method under mild conditions.After corroding the well-designed Ge9Ag1Al90 source alloy,the resulting Ge/Ag consists of the three dimensional(3D)interconnected Ge network skeleton with Ag nanoparticles uniformly dispersed onto the surface.Benefitting from unique 3D porous nanostructure and introduction of high-conductive Ag,the NP Ge/Ag composite exhibits much enhanced lithium storage performances by comparison with pure Ge material,including higher reversible capacitance,optimized rate capability as well as superior cycling performances.Besides,the NP Ge/Ag holds high cycling stability with large reversible capacity of 500 mA·h·g^(–1)remained under high current rate of 3200 mA·g^(-1)for an extended period of 300 loops.The Ge/Ag composite presents great potential in applications as an advanced anode candidate for lithium ion batteries in virtue of its excellent performances and green fabrication. | Ji Zhou Peng Huang Qin Hao Lina Zhang Hong Liu Caixia Xu Jinghua Yu | 2021 | Chinese Journal of Chemistry2021，39，10： | 1 |
| 2 | An aqueous 2.1 V pseudocapacitor with MXene and V-MnO_(2) electrodes显示文摘MXenes have shown record-breaking redox capacitance in aqueous electrolytes,but in a limited voltage window due to oxidation under anodic potential and hydrogen evolution under high cathodic potential.Coupling Ti3C2Tx Xene negative electrode with RuO_(2) or carbon-based positive electrodes expanded the voltage window in sulfuric acid electrolyte to about 1.5 V.Here,we present an asymmetric pseudocapacitor using abundant and eco-friendly vanadium doped MnO_(2) as the positive and Ti_(3)C_(2)Tx MXene as the negative electrode in a neutral 1M Li2SO4 electrolyte.This all-pseudocapacitive asymmetric device not only uses a safer electrolyte and is a much less expensive counter-electrode than RuO_(2),but also can operate within a 2.1 V voltage window,leading to a maximum energy density of 46 Wh/kg.This study also demonstrates the possibility of using MXene electrodes to expand the working voltage window of traditional redox-capable materials. | Jiabin Wu Qun Li Christopher E.Shuck Kathleen Maleski Husam N.Alshareef Jun Zhou Yury Gogotsi Liang Huang | 2022 | Nano Research2022，15，1： | 0 |
| 3 | Covalent interfacial coupling of vanadium nitride with nitrogen-rich carbon textile boosting its lithium storage performance as binder-free anode显示文摘Eliminating the usage of metal current collectors and binders in traditional battery electrode configuration is an effective strategy to significantly improve the capacities of lithium ion batteries (LIBs). Herein, we demonstrate the construction of porous vanadium nitride (VN) nanosheet network in situ grown on nitrogen-rich (N-rich) carbon textile (N-C@P-VN) as lightweight and binder-free anode for LIBs. The N-rich carbon textile is used both as the current collector and host to store Li^(+), thus improving the specific capacities of binder-free VN anode and meanwhile reducing the inert mass of the whole cell. Moreover, the open spaces in carbon textile and vertically aligned pores in VN nanosheet network can not only provide an expressway for Li+ and e− transport, but also afford more active sites. As a result, the binder-free N-C@P-VN anode maintains a specific capacity of 1,040 mAh·g^(−1) (or an areal capacity of 2.6 mAh·cm^(−2)) after 100 cycles at 0.1 mA·cm^(−2) in half cell. Moreover, in an assembled N-C@P-VN//LiFePO4 full cell, it exhibits an areal capacity of 1.7 mAh·cm^(−2) after 300 cycles at 0.1 C. The synergistic strategy of N-C substrate and porous VN network could be applied to guide rational design of similar N-C@nitride or sulfide hybrid systems with corresponding sulfur-doped carbon textile as the substrate. | Di Zhao Jinwen Qin Lirong Zheng Donglei Guo Jie Wang Minhua Cao | 2021 | Nano Research2021，14，11： | 0 |
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