MgSiO/Si-Coated Disproportionated SiO Composite Anodes with High Initial Coulombic Efficiency for Lithium Ion Batteries.

Silicon monoxide (SiO) is considered as one of the most promising anode material candidates for next-generation high-energy-density lithium ion batteries (LIBs) due to its high specific capacity and relatively lower volume expansion than that of Si. However, a large number of irreversible products are formed during the first charging and discharging process, resulting in a low initial Coulombic efficiency (ICE) of SiO. Herein, we report an economical and convenient method to increase the ICE of SiO without sacrificing its specific capacity by a solid reaction between magnesium silicide (MgSi) and micron-sized SiO.

Reactivating Li O with Nano-Sn to Achieve Ultrahigh Initial Coulombic Efficiency SiO Anodes for Li-Ion Batteries.

The application of SiO anodes in Li-ion batteries is greatly restricted by its low initial coulombic efficiency (ICE). Usually, a pre-lithiation procedure is necessary to improve the ICE, but the available technologies are associated with safety issues. Metal (M)-mixed SiO shows great promise to address these issues by reactivating Li O through the reaction M+Li O→MO +Li , which is the inverse reaction to that occurring at MO anodes.

Confining Al-Li alloys between pre-constructed conductive buffers for advanced aluminum anodes.

An aluminum anode with pre-constructed two-layer conductive buffers was prepared to restrict the expanding Al-Li alloy inside, and provide continuous electron pathways for promising electrical contact. The full cell demonstrates superior cycling stability (0.0352% capacity decay per cycle for 400 cycles at 0.

New perspective to understand the effect of electrochemical prelithiation behaviors on silicon monoxide.

Electrochemical prelithiation is a facile, effective and extensively used method to improve the initial coulombic efficiency of SiO. However, much less research attention has been devoted to prelithiation effect on initial several cycles. Here, we introduce a new perspective to evaluate the prelithiation behaviors, which could understand in depth the electrochemical prelithiation behaviors and their effects on the following two cycles.