Flower-like Mn/Co Glycerolate-Derived α-MnS/Co₉S₈/Carbon Heterostructures for High-Performance Lithium-Ion Batteries

Abstract

Transition-metal oxides/sulfides have been widely applied for energy storage because of their high-theoretical capacity and natural abundance with low prices, but they suffer from the volume change-induced pulverization problem during cycling. Herein, we present the successful fabrication of heterostructured α-MnS/Co 9 S 8 with simultaneous carbon hybridization through the chemical vapor deposition method, using the pre-synthesized flower-like Mn/Co-glycerate by the solvothermal method as a Mn/Co source and the thiophene as a C/S source. When applied as a lithium storage anode, the α-MnS/Co 9 S 8 /C electrode displays satisfactory electrochemical performances, exhibiting a high reversible capacity of 608 mA h g −1 at 500 mA g −1 upon 300 cycles with 73% capacity retention and a high rate capacity of 422 mA h g −1 at 1000 mA g −1 , which is much better than that for the Mn/Co-glycerate-derived MnCo 2 O x counterpart. Benefiting from the stepwise lithium storage behaviors of α-MnS and Co 9 S 8 and the carbon wrapping, the α-MnS/Co 9 S 8 /C heterostructures effectively suppress the electrode pulverization, which finally contributes to the enhanced lithium storage performance.

Preparation of Flower-like CuFe2O4 by a Self-Templating Method for High-Efficient Activation of Peroxymonosulfate To Degrade Carbamazepine

“…Thus, excessive glycerol addition could decrease the CuFe Fe-glycerate compounds. 40 There are two drive forces during the thermal treatment process of Cu/Fe-glycerate compounds. One is the contraction force induced by the oxidative degradation of the organic molecules in Cu/Fe-glycerate compounds, while the other is the adhesion force derived from the formation of CuFe 2 O 4 crystallites and the release of CO 2 gas from the decomposition of organic species.…”

“…When the calcination temperature reached 450 °C, the flower-like structure surface became smooth, and the flower-like CuFe 2 O 4 transformed to ball-like CuFe 2 O 4 (Figure c,f). The formation process of flower-like CuFe 2 O 4 can be described as follows: Fe­(NO) 3 ·9H 2 O and Cu­(NO 3 ) 2 ·4H 2 O were initially dissolved in isopropyl alcohol, and then the Fe 3+ and Cu 2+ ions coordinated with hydroxyl groups of glycerol during the solvothermal process, which formed the evenly distributed Cu/Fe-glycerate compounds . There are two drive forces during the thermal treatment process of Cu/Fe-glycerate compounds.…”

Nanocapsule of MnS Nanopolyhedron Core@CoS Nanoparticle/Carbon Shell@Pure Carbon Shell as Anode Material for High-Performance Lithium Storage

“…Many strategies have been proposed to overcome the above shortcomings of MnS. One of the most effective strategies is to combine a wide variety of MnS nanostructures with conductive materials, such as various carbonous materials [ 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. On the one hand, the well-designed nanostructures can not only alleviate the volumetric change of MnS, but also shorten diffusion paths of Li + in MnS.…”

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] …”