Rational construction of heterostructured core-shell Bi2S3@Co9S8 complex hollow particles toward high-performance Li- and Na-ion storage

Bi2S3 spheres coated with MOF-derived Co9S8 and N-doped carbon composite layer for half/full sodium-ion batteries with superior performance

“…1(a). Firstly, uniform BiOBr spheres are prepared via a facile solvothermal method according to the previous report [17,41]. Next, the ZIF-67 layer is grown onto the BiOBr spheres at room temperature, thus forming well-defined BiOBr@ZIF-67 core-shell structures.…”

“…However, its low electrical conductivity and the dramatic volumetric change during sodiation and desodiation inevitably bring in poor rate capability and rapid capacity degradation, which significantly restrict the practical applications of Bi 2 S 3 as an anode material for SIBs. In recent years, tremendous efforts have been devoted to improving the sodium storage performance of Bi 2 S 3 , such as structure design, composition optimization and building hybrid materials [10,[14][15][16][17][18][19][20]. On the other hand, it has been demonstrated that surface coating of anode materials with conductive materials could effectively resolve the aforementioned issues [21][22][23][24][25].…”

“…In this unique core-shell configuration, the MOF-derived surface coating layer is consisting of Co 9 S 8 nanoparticles uniformly embedded in the NC matrix, while the inner Bi 2 S 3 spherical core is converted from the BiOBr spheres. The advantages for such unique structure can be expressed as follows: (1) The robust Co 9 S 8 /NC composite layer can accommodate the volumetric changes of Bi 2 S 3 core and maintain the structural integrity [20,21,26]; (2) the conductive NC not only improves the electrical conductivity of Bi 2 S 3 and Co 9 S 8 but also enhances the surface hydrophilicity [22,34]; (3) the high porosity of the Co 9 S 8 / NC composite layer can facilitate the ion diffusion and enlarge the interfacial contact area between electrolyte and electrode material, resulting in fast reaction kinetics [38,39]; (4) the MOF-derived Co 9 S 8 /NC composite layer itself is an advanced sodium storage material that also contribute to the total capacity [7,17];…”

Fabrication of a Sandwich‐like VS4‐Graphene Composite via Self‐assembly for Highly Stable Lithium‐ion Batteries

“…[4,5] Therefore, extensive efforts are being devoted to discovering and synthesizing novel anode materials that possess considerable capacities. [6][7][8][9][10] Several transitional metal sulfides (such as Co 9 S 8 , [11,12] MoS 2 , [13][14][15] and FeS 2 [16][17][18][19] ) have been recently investigated as attractive electrode materials in LIBs, because of their large lithium-ion diffusion coefficient, high theoretical capacity, and good redox reversibility behavior. [20][21][22][23][24][25][26][27][28] Vanadium sulfide also shows tremendous potential for application in LIBs as an important affiliate of the transitional metal sulfide family.…”

“…But, the low theoretical capacity of graphite (372 mA h g −1 ) makes it unsuitable for using in commercial LIBs, because it cannot meet the steadily increasing requirements of high levels of power density and energy density [4,5] . Therefore, extensive efforts are being devoted to discovering and synthesizing novel anode materials that possess considerable capacities [6–10] …”