A Novel Anode with Superior Cycling Stability Based on Silicon Encapsulated in Shell‐Like rGO/CNT Architecture for Lithium‐Ion Batteries

Abstract

Although silicon is intensively pursued as the most promising anode material for lithium‐ion batteries (LIBs), the extensive utilization of silicon is still impeded by severe capacity fading and limited cycle life. A robust layer‐by‐layer architecture of the silicon‐based anode, which shields silicon nanoparticles (SiNPs) with shell‐like reduced graphene oxide (rGO) layers supported by the intertwined framework of carbon nanotubes (CNTs), is developed. Such structure guarantees high reversible capacity and cyclic stability by enclosing SiNPs in the stable shells, which supplies sufficient void space for the expansion of SiNPs and prevents electrolyte‐consuming capacity. In addition, the electrode kinetics in the plane direction are enhanced due to the intimate contact between SiNPs and highly conductive rGO layers, while the highly conductive framework of CNTs has a similar impact on that in the direction of the vertical plane. As a result, the nanocomposite anode demonstrates an improved cycling stability with 1438.31 mAh g−1 after 100 cycles and a superior rate performance of 1112.64 mAh g−1 at 5 C rate in a half‐cell electrochemical test.

Robust Core–Shell Carbon-Coated Silicon-Based Composite Anode with Electrically Interconnected Spherical Framework for Lithium-Ion Battery

“…The C-Si/CNT/ GO composite anode exhibited improved rate capability and cycle stability than the C-Si/CNT and C-Si/CNT/(S) composite anodes. For Li-ion extraction up to 6 C, the C-Si/ CNT/GO composite anode exhibited an excellent rate capability of 1506 mAh g −1 , which was compared with the rate capability of previously reported Si/CNT/graphene composite anodes (Figure 5(e)) [39][40][41][42][43][44][45][46][47][48]. The C-Si/CNT/GO composite anode fabricated in this study exhibited a rate capability superior to that of other Si/CNT/graphene composite anodes, even at high current densities.…”

Wrapping silicon microparticles by using well-dispersed single-walled carbon nanotubes for the preparation of high-performance lithium-ion battery anode

“…Due to the oxidation of silicon at high temperatures in the air atmosphere, TGA curves of SiMP, SiMP/CNT wrapping 9 : 1, and SiMP/CNT wrapping 8 : 2 show gradual weight increases . 11,37,38 In Fig. 4c , the TGA curves indicate that the amount of SWCNTs in the SiMP/CNT wrapping 8 : 2 and SiMP/CNT wrapping 9 : 1 composites is 16.9% and 8.7%, respectively.…”

“…3,6,8,9 Among the various carbon materials, carbon nanotubes (CNTs) have received extensive consideration in the targeting of efficient composite design. [10][11][12][13] From a structural viewpoint, the superb mechanical stabilities and excellent electrical conductivities of CNTs have been reported to overcome the aforementioned intrinsic issues of Si electrodes. [14][15][16] Despite the impressive advances, Si/CNT composite design typically requires complicated procedures.…”

Advances in micro lithium-ion batteries for on-chip and wearable applications

“…Wang et al fabricated SiNPs enclosed in rGO spheres composite using lyophilization to achieve capacity retention close to 1000 mAh g −1 after 500 cycles. In addition, they also designed the 'shell-like' rGO/CNT/SiNPs structure, lithography-based one-step Si/void/C composite, and other structures that demonstrate the high initial capacity with enhanced cycling stability and outstanding rate-capability [33].…”

“…Besides, there are more versatile methods such as lithography, self-assembly, vacuum filtration [33,73,74], and high-throughput preparation methods along with convenience, such as spray coating, dip coating, electrostatic spinning, etc [75][76][77], which provide new ideas for the manufacturing of µLIBs.…”