A nanostructured SnO₂/Ni/CNT composite as an anode for Li ion batteries

Abstract

SnO2/Ni/CNT nanocomposite approach has been demonstrated which confers shielding against volume expansion due to the use of optimum % of Ni & CNT exhibiting superior cycling stability and rate capabilities of the stable electrode structure.

Ni-Doped SnO2 Nanoparticles Anchored on Carbon Nanotubes as Anode Materials for Lithium-Ion Batteries

“…The peaks at around 1.31 and 1.92 V are caused by the oxidation of Sn to SnO and SnO 2 . , It can be found that there is no obvious peak about Ni in the CV curve of SNC, which is due to the low content of Ni in SNC, thus leading to the inconspicuous oxidation and reduction peaks and the overlap with SnO 2 . The CV curves of SNC can be found to be significantly different from the CV curves of SC (Figure C) and SnO 2 (Figure E), including the position of the redox peaks and the areas enclosed by the CV curves; this is also the reason for the difference in the electrochemical performance of the three. , In addition, the CV curves of the second and third cycles of SNC almost overlap, while the CV curves of SC and SnO 2 overlap lesser, indicating that Ni doping and CNT wrapping can enhance the material reversibility and greatly improve the electrochemical performance. , …”

“…The CV curves of SNC can be found to be significantly different from the CV curves of SC (Figure 5C) and SnO 2 (Figure 5E), including the position of the redox peaks and the areas enclosed by the CV curves; this is also the reason for the difference in the electrochemical performance of the three. 26,41 In addition, the CV curves of the second and third cycles of SNC almost overlap, while the CV curves of SC and SnO 2 overlap lesser, indicating that Ni doping and CNT wrapping can enhance the material reversibility and greatly improve the electrochemical performance. 39,42 The charge and discharge curves can also be used to describe the electrochemical reaction process of SNC.…”

“…In addition, a more pronounced peak is also observed at 44.5°in the XRD spectra of SNC, which corresponds to the (1 1 1) lattice plane of Ni (JCPDS card no. 70-1849), 26 indicating that the composite material contains metallic Ni and SnO 2 .…”

“…Comparing these results, it is demonstrated that the SNC anode material has excellent cycling performance, which is attributed to the Ni doping that increases the electrical conductivity, prevents the expansion of the SnO 2 lattice volume, enhances the alloying and dealloying reactions, and also prevents the coarsening of Sn that accompanies constant charging and discharging. In addition, the nano-Ni can also act as a catalyst for the decomposition of Li 2 O, as shown in the following eqs and , normalN normali + normalL normali 2 normalO → normalN normali normalO + 2 normalL normali + + 2 e − normalN normali normalO + 2 normalL normali + + 2 e − → normalN normali + normalL normali 2 normalO …”

Synthesis and Electrochemical Properties of SnO2/C Nanocomposites

“…However, the safety concern and the low capacity (372 mAh g −1 ) of commercial graphite material impeded its application in high-energy LIBs. Therefore, researchers are facing to develop the low cost, efficient, eco-friendly, small size and light weight electrical energy storage devices as one of the major challenges they confronted [2]. Transition metal oxides (TMOs, usually 400-900 mAh g -1 ) have got a lot of attention, because of easy preparation, low cost, large energy density, and good safety [3].…”