Dual Immobilization of SnO_x Nanoparticles by N-Doped Carbon and TiO₂ for High-Performance Lithium-Ion Battery Anodes

Abstract

The grain aggregation engendered kinetics failure is regarded as the main reason for the electrochemical decay of nanosized anode materials. Herein, we proposed a dual immobilization strategy to suppress the migration and aggregation of SnO x nanoparticles and corresponding lithiation products through constructing SnO x /TiO2@PC composites. The N-doped carbon could anchor the tin oxide particles and inhibit their aggregation during the preparation process, leading to a uniform distribution of ultrafine SnO x nanoparticles in the matrix. Meanwhile, the incorporated TiO2 component works as parclose to suppress the migration and coarsening of SnO x and corresponding lithiation products. In addition, the N-doped carbon and TiO2/Li x TiO2 can significantly improve the electrical and ionic conductivities of the composites, enabling a good diffusion and charge-transfer dynamics. Owing to the dual immobilization from the “synergistic effect” of N-doped carbon and the “parclose effect” of TiO2, the conversion reaction of SnO x remains fully reversible throughout the cycling. Thereby, the composites exhibit excellent cycling performance in half cells and can be fully utilized in full cells. This work may provide an inspiration for the rational design of tin-based anodes for high-performance lithium-ion batteries.

Nitrogen‐Doped Carbon‐Encapsulated Ordered Mesoporous SiOx as Anode for High‐Performance Lithium‐Ion Batteries

“…In the O 1s region, the typical peak at 532.1 eV is observed, which attributed to the Si−O, revealing the presence of Si−O bonds in the composite (Figure S3) [15] . The C 1s spectrum (Figure 4c) indicates the existence of C−C/C=C (284.6 eV), C−N (285.4 eV), C−O (286.4 eV) and C=O (289.4 eV) bonds in the SiO x @NC composite [6d,16] . The identification of C−N bonds confirms the N‐doping in the carbon matrix.…”

ZIF-8-Derived Carbon In Situ Modification of High-Content Manganese Oxide for a High-Capacity Lithium-Ion Battery

“…The cathode peak at 0.27 V shifted to ∼1.0 V (peak 4) in the 300th cycle as a result of the improvement of reaction kinetics. In addition, the CV curves of the 301st, 302nd, and 303rd cycles completely overlap, and the polarization of the CV curve decreases at the 300th cycle, which indicates excellent structural and dynamic stability …”

“…In addition, the CV curves of the 301st, 302nd, and 303rd cycles completely overlap, and the polarization of the CV curve decreases at the 300th cycle, which indicates excellent structural and dynamic stability. 42 Figure 5b exhibits the charge−discharge curves of MnO x @C for the 1st, 2nd, 3rd, 100th, 200th, and 300th cycles at 0.2 A g −1 . The initial discharge and charge specific capacities of MnO x @C are 1098 and 844 mAh g −1 with a high ICE of 77%.…”

Freestanding and Flexible Interfacial Layer Enables Bottom-Up Zn Deposition Toward Dendrite-Free Aqueous Zn-Ion Batteries

“…As for N 1s spectra, three component peaks can be matched corresponding to pyridinic N (398.1 eV), pyrrolic N (399.4 eV), and graphitic N (400.1 eV), respectively (Figs. 4e and S24b) [61][62][63].…”