A chemically bonded CuP2/C hybrid synthesized using a one-step mechanochemical reaction has been evaluated as an anode in sodium-ion batteries. Due to the synergistic effects of the formation of a strong P-O-C bond and the stable nanoscale conducting framework, it exhibits a high capacity with superior cyclability and rate performance.
Recently, sodium-ion batteries (SIBs) have become an appealing choice for the next-generation sustainable energy storage due to a significant resource advantage of Na over Li. [1] In realizing keyenabling materials for SIBs, great efforts have been made onto the Na-intercalation cathode materials, among which the layered transitional-metal (TM) oxides with a general formula of Na x MO 2 (M = Ni, Co, Mn, Fe, Cu, etc.) have attracted the most attention since the early 1980s. [2] According to Delmas et al, [3] these layered metal oxides can be classified into P2 and O3 types based Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))
Micro-sized carbon-coated Si-based composite synthesized by a low-cost and scalable synthetic process exhibits enhanced electrochemical performance with a high tap density of ~ 1.34 g cm -3 .
AbstractMicro-sized carbon-coated Si-based composites have been developed by a simple mechanochemical reaction between SiO, Ni, and Al, followed by an additional milling process with graphite. The resultant carbon-coated Si-based composite exhibits a reversible capacity of over 580 mA h g -1 after 200 cycles with a much higher tap density of ~ 1.34 g cm -3 compared to nanosized Si (~ 0.16 g cm -3 ). The improvement in the electrochemical performance is achieved due to both a highly conductive NiSi 2 nanoinclusions and amorphous Al 2 O 3 buffer matrix in the composite. Upon cycling, the multifunctional NiSi 2 phase not only provides enhanced electronic conductivity but also suppresses the formation of crystalline Li 15 Si 4 that causes an inhomogeneous volume change. Simultaneously, amorphous Al 2 O 3 plays a crucial role in maintaining particle connectivity by impeding the agglomeration of active Si nanocrystallites.The combination of these advantages with a low-cost, scalable, and environmentally benign synthetic process make the Si-based composite a promising alternative anode for high performance Li-ion batteries.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.