Green Synthesis of Dual Carbon Conductive Network-Encapsulated Hollow SiO_x Spheres for Superior Lithium-Ion Batteries

Abstract

Designing hollow/porous structure is regarded as an effective approach to address the dramatic volumetric variation issue for Si-based anode materials in Li-ion batteries (LIBs). Pioneer studies mainly focused on acid/alkali etching to create hollow/porous structures, which are, however, highly corrosive and may lead to a complicated synthetic process. In this paper, a dual carbon conductive network-encapsulated hollow SiO x (DC-HSiO x ) is fabricated through a green route, where polyacrylic acid is adopted as an eco-friendly soft template. Low electrical resistance and integrated electrode structure can be maintained during cycles because of the dual carbon conductive networks distributed both on the surface of single particles formed by amorphous carbon and among particles constructed by reduced graphene oxide. Importantly, the hollow space is reserved within SiO x spheres to accommodate the huge volumetric variation and shorten the transport pathway of Li+ ions. As a result, the DC-HSiO x composite delivers a large reversible capacity of 1113 mA h g–1 at 0.1 A g–1, an excellent cycling performance up to 300 cycles with a capacity retention of 92.5% at 0.5 A g–1, and a good rate capability. Furthermore, the DC-HSiO x //LiNi0.8Co0.1Mn0.1O2 full cell exhibits high energy density (419 W h kg–1) and superior cycling performance. These results render an opportunity for the unique DC-HSiO x composite as a potential anode material for use in high-performance LIBs.

Microsphere‐Like SiO2/MXene Hybrid Material Enabling High Performance Anode for Lithium Ion Batteries

“…Unfortunately, the large volume variation (≈400%) during cycling of Si‐based anode induces severe capacity decay . Compared with Si‐based anode, SiO 2 ‐based anode is inclined to obtain better cycling performance owing to in situ generated Li 2 O and Li silicates during the first lithiation process that may alleviate the huge volume variation . Besides, the lower cost and easier synthesis of SiO 2 material than those of Si material promote the industrial implementation of SiO 2 ‐based anode in LIBs .…”

Engineering Molecular Polymerization for Template‐Free SiOx/C Hollow Spheres as Ultrastable Anodes in Lithium‐Ion Batteries

“…Compared with the reported SiO x hollow materials with carbon outer layers, the SiO x /C HS‐TA reveals superior cycling performance and rate capacity, which are attributed to the uniform dispersion between SiO x units and carbon capsids at nanocluster scale (Table S1, Supporting Information). [ 14,17 ]…”

Silicon Anodes for High‐Performance Storage Devices: Structural Design, Material Compounding, Advances in Electrolytes and Binders

“…Further, micrometer‐size bulk‐porous Si (MBPS) is also prepared by a Cu‐assisted chemical wet‐etching method and obtain reversible specific capacity of 2126 mAh g −1 with a high initial Coulombic efficiency of 92% . There is also porous silicon anode obtained by etching such as DC‐HSiOx which delivers a large reversible capacity of 1113 mAh g −1 at 0.1 A g −1 , an excellent cycling performance up to 300 cycles with capacity retention of 92.5% at 0.5 A g −1 and PoSi/CMTs which maintain a value of 1127 mA h g −1 after 100 cycles at a current density of 200 mA g −1 …”