Manipulating Oxidation of Silicon with Fresh Surface Enabling Stable Battery Anode

Abstract

Silicon (Si)-based material is a promising anode material for next-generation lithium-ion batteries (LIBs). Herein, we report the fabrication of a silicon oxide−carbon (SiO x /C) nanocomposite through the reaction between silicon particles with fresh surface and H 2 O in a mild hydrothermal condition, as well as conducting carbon coating synchronously. We found that controllable oxidation could be realized for Si particles to produce uniform SiO x after the removal of the native passivation layer. The uniform oxidation and conductive coating offered the as-fabricated SiO x /C composite good stability at both particle and electrode level over electrochemical cycling. The as-fabricated SiO x /C composite delivered a high reversible capacity of 1133 mAh g −1 at 0.5 A g −1 with 89.1% capacity retention after 200 cycles. With 15 wt % SiO x /C composite, graphite-SiO x /C hybrid electrode displayed a high reversible specific capacity of 496 mAh g −1 and stable electrochemical cycling with a capacity retention of 90.1% for 100 cycles.

One-Step, Vacuum-Assisted Construction of Micrometer-Sized Nanoporous Silicon Confined by Uniform Two-Dimensional N-Doped Carbon toward Advanced Li Ion and MXene-Based Li Metal Batteries

“…17,32,48 Moreover, the gradual improvement of the peak area is obtained during the following cycles because of the activation of more NPSi@NCNFs to alloy with Li. 27,35,49 The reversible capacity, cyclic performance, and rate capability of NPSi@NCNFs are explored by galvanostatic charge/discharge tests (Figure 3b−j). For the Nano-Si anode (Figure S7), the initial discharge/charge capacities of Nano-Si are ∼2903.1/∼1738.9 mAh g −1 with 59.9% ICE.…”

Interface engineering towardhigh‐efficiencyalloy anode for next‐generation energy storage device

“…Recently, Sun et al fabricated fresh surface of Si and synchronous carbon coating to form SiO x /C composites by a facile one‐step hydrothermal process (Figure 6A). 86 The cycling stability of the SiO x /C composite is significantly improved in comparison to the pristine Si (Figure 6B). Additionally, graphdiyne (GDY), a new generation of carbonaceous allotropes with layered 2D structure, composed of two acetylenic groups between two adjacent benzene rings in one unit have a great potential for application in energy storage devices 87 .…”

“…B, Cycling performance of the SiO x /C composite and pristine Si. Reproduced with permission 86 . Copyright 2021, American Chemical Society.…”

Sea Urchin-like Si@MnO2@rGO as Anodes for High-Performance Lithium-Ion Batteries

“…In recent years, environmental pollution caused by carbon emissions has an increasing urgency for developing high-density, long lifetime storage materials or storage devices for clean energy. As a carrier of clean energy, lithium-ion batteries play a pivotal role in the country's goal of achieving carbon neutrality [1][2][3][4]. A Silicon-based electrode is one of the most promising candidates as an anode for lithium-ion batteries and is expected to replace the use of a commercial graphite electrode (372 mAh g −1 ) due to its remarkable theoretical capacity (4200 mAh g −1 ) [5,6].…”