Nitrogen‐Doped Carbon‐Encapsulated Ordered Mesoporous SiO_x as Anode for High‐Performance Lithium‐Ion Batteries

Abstract

SiO x (0 < x < 2) has been broadly investigated as a promising anode in lithium-ion batteries (LIBs) due to its high theoretical capacity, low cost, and proper working voltage. Nevertheless, its practical application is hindered by volume expansion during the lithiation process and low electrical conductivity, resulting in rapid capacity decay. Herein, we designed a core-shell structured nitrogen-doped carbonencapsulated ordered mesoporous SiO x composite (SiO x @NC) using 3-aminophenol-formaldehyde (3-AF) as carbon and nitrogen precursor, tetraethyl orthosilicate (TEOS) as the silica precursor, and cationic surfactant cetyltrimethylammonium bromide (C 16 TAB) as the mesoporous template. The obtained composite electrode not only can effectively reduce the volume expansion, but also can effectively improve electronic conductivity and further enhance the charge and ion transfer kinetics. Benefiting from the unique structural merits, the obtained SiO x @NC-2 delivers a high reversible capacity of 602.4 mAh g À 1 at 0.1 A g À 1 after 100 cycles and long-term cyclability (maintain 426.1 mAh g À 1 over 1000 cycles at 1 A g À 1 ).

Rapid Printing of High-Temperature Polymer-Derived Ceramic Composite Thin-Film Thermistor with Laser Pyrolysis

“…It indicates that the B powder and TiB 2 on the sample’s surface were entirely oxidized, and abundant B 2 O 3 was generated. Meanwhile, the analysis of the Si 2p spectrum (Figure f) shows a 104.3 eV peak after high-temperature oxidation, indicating the formation of silica. − With an enormous amount of free Si, it is easy for PDC to form SiO 2 in a high-temperature environment. , …”

Influence of carbon sources on silicon oxides for lithium-ion batteries: a review

“…6b). 97 This composite anode exhibited improved charge and ion transfer kinetics, significantly improved electronic conductivity and reduced volume expansion. As a consequence, the resulting SiO x @NC anode demonstrated long-term cyclability, maintaining a capacity of 426.1 mA h g −1 over 1000 cycles at 1 A g −1 .…”

“…In addition to resorcinol, 3-aminophenol serves as another frequently used resin carbon source for SiO x /C composites. 97–99 Compared with resorcinol, 3-aminophenol allows for in situ N doping, which may further reduce the charge transfer impedance, improving the energy storage performance. For example, Mai and co-workers successfully prepared ultrafine SiO x /C composite nanospheres with a consistent diameter of approximately 40 nm using a resin derived from the polymerization of 3-aminophenol as a carbon source.…”