Face‐to‐Face Contact and Open‐Void Coinvolved Si/C Nanohybrids Lithium‐Ion Battery Anodes with Extremely Long Cycle Life

Abstract

To develop high-performance anode materials of lithium-ion batteries (LIBs) instead of commercial graphite for practical applications, herein, a layer of silicon has been well-anchored onto a 3D graphene/carbon nanotube (CNT) aerogels (CAs) framework with face-to-face contact and balanced open void by a simple chemical vapor deposition strategy. The engineered contact interface between CAs and Si creates high-effi ciency channels for the rapid electrons and lithium ions transport, and meanwhile, the balanced open-void allows the free expansion of Si during cycling while maintaining high structural integrity due to the robust mechanical strength of 3D CAs framework. As a consequence, the as-synthesized Si/CAs nanohybrids are highly stable anode materials for LIBs with a high reversible discharge capacity (1498 mAh g −1 at 200 mA g −1 ) and excellent rate capability (462 mAh g −1 at 10 000 mA g −1 ), which is much better than Si/graphene-CNTs-mixture (51 mAh g −1 at 10 000 mA g −1 ). More signifi cantly, it is found that the Si/CAs nanohybrids display no obvious capacity decline even after 2000 cycles at a high current density of 10 000 mA g −1 . The present Si/CAs nanohybrids are one of the most stable Si-based anode materials ever reported for LIBs to date.

In Situ Synthesis of Multilayer Carbon Matrix Decorated with Copper Particles: Enhancing the Performance of Si as Anode for Li-Ion Batteries

“…Figure (c) illustrates the Raman spectra of Si@C@Cu. The weak peak at 290 cm –1 can be ascribed to the second acoustic phonon mode of Si, , while the strong peak at 516 cm –1 is characteristic of crystalline Si, which is blue-shifted by 21 cm –1 due to the carbon shell . The two broad peaks at 1364 and 1592 cm –1 are from the D and G peaks of carbon.…”

“…The weak peak at 290 cm −1 can be ascribed to the second acoustic phonon mode of Si, 7,37 while the strong peak at 516 cm −1 is characteristic of crystalline Si, which is blue-shifted by 21 cm −1 due to the carbon shell. 38 The two broad peaks at 1364 and 1592 cm −1 are from the D and G peaks of carbon. Overall, a 3D multilayer CNTs/C matrix decorated with conducting agents is generated by an in situ method via a controllable gelation process.…”

Two-Dimensional Silicon/Carbon from Commercial Alloy and CO2 for Lithium Storage and Flexible Ti3C2Tx MXene-Based Lithium–Metal Batteries

“…After calculation, L-Si/C-750 exhibits a higher graphitization degree than that of L-Si/C-550 and L-Si/C-650 products. Better crystallinity of carbon may provide excellent electronic conductivity and promote fast electron transport. ,, Furthermore, compared with that of Si peaks, the intensity of C peaks is weak, indicating that the carbon content in L-Si/C products is low. With the increasing of the heating temperature, the improved intensity of C peaks reveals that carbon content in the L-Si/C product is enhanced.…”

Self‐Supported Lithium Titanium Oxide Nanosheet Arrays Decorated with Molybdenum Disulfide for High‐Performance Lithium‐Ion Batteries

“…The development of safe, high‐rate, long‐lasting lithium‐ion batteries (LIBs) and a wide operating temperature range is of great technological importance for critical applications such as fast‐charging electric vehicles, locomotives, cargo ships, and power grids . Among the candidate materials, titanium‐based ones have been intensively investigated owing to their safety and good cycle stability .…”