Improving Electrochemical Performance of Thick Silicon Film Anodes with Implanted Solid Lithium Source Electrolyte

Abstract

Silicon is a potential next-generation anode material for a lithium-ion battery. However, the large-scale application of silicon is restricted by poor electrical conductivity, large volume change, and high irreversible capacity during the charge/discharge process. Here, we proposed a simple strategy by preimplanting a solid lithium source electrolyte (Li2CO3 and Li2O) into Si thick film to improve the electrochemical properties of Si materials. The implanted solid lithium source electrolyte participates in and induces the formation of SEI not only on the top surface of Si film but also in the interface of Si particles. The thick Si film with the implanted solid lithium electrolyte (a thickness of ∼10 μm) delivers above 2000 mAh g–1 specific capacity, >92% initial Coulombic efficiency, and ∼87% capacity retention over 150 cycles at 400 mA g–1. The present work sheds light on the design of high capacity and long cycle life electrode materials for other batteries.

Enabling 4.6 V LiNi0.6Co0.2Mn0.2O2 cathodes with excellent structural stability: combining surface LiLaO2 self-assembly and subsurface La-pillar engineering

“…Both the oxidation and reduction peak currents of the three samples gradually increase with the scanning rate and shift toward low and high potentials, respectively. The fitting result indicates that the diffusion-controlled electrochemical process dominates the charge/discharge reaction in electrodes [58][59][60] . The b values of the cathode peaks of NCM622, NCM622-La and NCM622-La@LLO are 0.76, 0.80 and 0.83, respectively, indicating that the NCM622-La@LLO has more significant surface capacitive effects [Figure 3G].…”

Binder-Free Intertwined Si and MnO2 Composite Electrode for High-Performance Li-Ion Battery Anode

“…Regardless of its advantages, it is still challenging for the pure Si film to achieve long-term stable cycling. Applying hybridization with metal, − metallic oxides, − conductive carbon materials, − or lithium oxides , is a productive strategy relieving the Si volume expansion. For example, Boles and coworkers made Si–Ti composite films by magnetron sputtering.…”