Insights into the Li+ storage mechanism of TiC@C-TiO2 core-shell nanostructures as high performance anodes

Nanoscopically and uniformly distributed SnO2@TiO2/C composite with highly mesoporous structure and bichemical bonds for enhanced lithium ion storage performances

“…Titanium dioxide (TiO 2 ) has been regarded as a promising anode material in rechargeable lithium ion batteries (LIBs) due to its low cost, non-toxicity, and ultralow volume change (o4%) during lithium ion intercalation/deintercalation. 1,2 TiO 2 possesses a series of allotropes, such as anatase, 3,4 rutile, 5,6 and TiO 2 -B. 7,8 Among them, anatase TiO 2 has been widely investigated due to its inherent crystal structure for lithium ion storage.…”

“…3 In order to enhance the capacity of TiO 2 , a large number of efforts have been made: (i) preparing nanostructures like nanoparticles, 3 nanotubes, 4 nanosheets, 11 and nanomembranes; 12 (ii) fabricating mesoporous composites; 13,14 (iii) forming phase boundaries; 11 and (iv) constructing interfacial chemical bonds. 1,15 Specifically, the design of nanostructures and mesoporous structure is intended to increase the contact area of active material with the electrolyte and shorten the transport distance of lithium ions, thus ensuring sufficient reaction between lithium ions and the active material to increase the reversible capacity. Additionally, the capacity can be enhanced by diminishing the particle size to the nanoscale, which can increase the number of interfaces between materials to accommodate more lithium ions.…”

Zn(Cu)Si2+xP3 Solid Solution Anodes for High‐Performance Li‐Ion Batteries with Tunable Working Potentials

“…[25,26] In addition to the XRD analysis, we further performed Raman spectroscopy analysis. More specifically, the cubic ZnS crystal structure can also be confirmed by the observation of the exposed (220) and (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) crystal planes along the zone axis of [001], as indicated by d-spacings of lattice fringes in Figure 1f. The morphology of the ZnSi 2 P 3 powder was further examined using field-emission scanning electron microscopy (FESEM; Figure S1, Supporting Information) and low-magnitude transmission electron microscopy (TEM, Figure 1e).…”

“…As shown in Figure S7 in the Supporting Information, the as-synthesized ZnSi 2 P 3 delivers a first-cycle discharge capacity of 2300 mAh g −1 , corresponding to 18.5 Li + , and the charge capacity of 2110 mAh g −1 , corresponding to 17 Li + , thus contributing to the initial Coulombic efficiency up to 92%. As shown in Figure S7 in the Supporting Information, the as-synthesized ZnSi 2 P 3 delivers a first-cycle discharge capacity of 2300 mAh g −1 , corresponding to 18.5 Li + , and the charge capacity of 2110 mAh g −1 , corresponding to 17 Li + , thus contributing to the initial Coulombic efficiency up to 92%.…”

“…To address these issues, various strategies have been developed, including nanostructure engineering, porous structure tuning, and surface modification with coatings. [13][14][15][16][17][18] For example, ternary composites Fe-Cu-Si, Sn-Ni-C, and P-Sn 4 P 3 -graphene delivered much better cyclability and higher initial Coulombic efficiency than the relevant binary composite electrodes. Considering the large specific capacity, phosphorus has been introduced into Si to develop binary compounds of SiP 2 and SiP.…”