Bifunctional NaCl template for the synthesis of Si@graphitic carbon nanosheets as advanced anode materials for lithium ion batteries

Abstract

A 2D Si@GC nanosheet composite is synthesized through a facile ball-milling method using NaCl as a bifunctional template, which can achieve a high reversible capacity and long-term cycling performance when evaluated as an anode material for LIBs.

Construction of a core–double-shell structured Si@graphene@Al2O3 composite for a high-performance lithium-ion battery anode

“…41 As can be observed in Fig. 6a, different from those in previous reports where the oxidic peak current density increases with scan loops, 42–44 the oxidic peak current of the p-Si@G@g-Al 2 O 3 electrode in the 3rd cycle is almost equal to that at the 2nd cycle, suggesting the full delithiation of the LixSi alloy in the p-Si@G@g-Al 2 O 3 composite at the initial three cycles, which is possibly related to the presence of the in situ electro-generated LiAlO 2 phase during the 1st lithiation process. In fact, the in situ electro-generated LiAlO 2 not only can reduce the lithium ion trapping in p-Si@G@g-Al 2 O 3 and boost the electrochemical activation of the electrode at the initial cycles, 41 but also has a significant effect on the whole electrochemical performance of the p-Si@G@g-Al 2 O 3 electrode, and will be verified in the subsequent section.…”

Tuning the electrochemical capacitance of carbon nanosheets by optimizing its thickness through controlling the carbon precursor in salt‐template

“…Two peaks around 1347 and 1597 cm −1 observed in the Raman spectra correspond to the D‐ and G‐band of respective carbon samples. The relative intensity ratio ( I D / I G ) of the as‐prepared carbon nanosheets is 0.84, which indicates the significant contribution from the sp 3 hybridized or short‐range ordered carbon. 25,26 Interestingly, all the TCS samples show a similar I D / I G ratio, hence, the variation in the amount of starch did not influence graphitic or disordered carbon in the derived nanosheets. It suggests that the NaCl template did not affect the material properties and is providing the ideal template medium for nanosheet formation.…”

A Hierarchical Si/C Nanocomposite of Stable Conductive Network Formed Through Thermal Phase Separation of Asphaltenes for High‐Performance Li‐Ion Batteries

“…[10][11][12] Due to its high mechanical strength and conductivity, carbon-based materials have been widely used to enhance the conductivity of silicon and as a protective layer to alleviate the detrimental effect of silicon expansion. [10,13] Hierarchical structures combining carbon coatings with other carbon-based conductive materials, such as carbon nanotubes, [8][9]14] carbon nanosheets [15][16][17][18] and graphene [19][20][21] have been proposed to construct a robust protection layer to accommodate the volume change and a conductive network to maintain the integrity of electrode structures. However, the silicon particles and these carbon materials are often mixed by physical methods.…”