Silicon Nanowire Array Weaved by Carbon Chains for Stretchable Lithium‐Ion Battery Anode

Abstract

To manufacture flexible batteries, it can be a challenge for silicon base anode materials to maintain structural integrity and electrical connectivity under bending and torsion conditions. In this work, 1D silicon nanowire array structures combined with flexible carbon chains consisting of short carbon nanofibers (CNFs) and long carbon nanotubes (CNTs) are proposed. The CNFs and CNTs serve as chain joints and separate chain units, respectively, weaving the well‐ordered Si nanowire array into a robust and integrated configuration. The prepared flexible and stretchable silicon array anode exhibits excellent electrochemical performance during dynamic operation. A high initial specific capacity of 2856 mAh g−1 is achieved. After 1000 cycles, a capacity retention of 60% (1602 mAh g−1) is maintained. Additionally, the capacity attenuation is less than 1% after 100 bending cycles. This excellent cycling stability is obtained with a high Si loading of 6.92 mg cm−2. This novel approach offers great promise for the development of high‐loading flexible energy‐storage devices.

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

“…Most existing efforts to address this problem focus on structure tuning, active/inactive composite design, and scale-down. Typically, engineering Si into various nanostructures, such as nanowires, − nanotubes, − core–shell, − hollow, , and yolk–shell structures, − alleviates the volume expansion and pulverization of Si upon cycling. However, the complex synthesis procedures and high costs pose scale-up concerns.…”