Hierarchical MoS₂/Carbon Composite Microspheres as Advanced Anodes for Lithium/Sodium‐Ion Batteries

Abstract

It is crucial to design advanced electrodes with large Li/Na-ion storage capacities for the development of next-generation battery systems. Herein, hierarchical MoS /C composite microspheres were constructed by facile template-free self-assembly sulfurization plus post-carbonization. Cross-linked MoS nanosheets and outer carbon layer are organically combined together to form composite microspheres with diameters of 400-500 nm. Due to enhanced electrical conductivity and good structural stability, the MoS /C composite microspheres exhibit substantially improved Li/Na-ion storage performance. Compared to unmodified MoS , MoS /C composite microspheres deliver higher Li/Na-ion storage capacity (Li : 1017 mA h g at 100 mA g and Na : 531 mA h g at 100 mA g ), as well as better rate capability (Li : 434 mA h g at 1 Ag and Na : 102 mA h g at 1 Ag ) and capacity retention (Li : 902 mA h g after 200 cycles and Na : 342 mA h g over 100 cycles). The superior Li/Na-ion storage performance is mainly attributed to the unique porous microsphere architecture with increased electrode/electrolyte interfaces and more diffusion paths for Li/Na ion insertion. Additionally, the carbon coating can not only improve the electronic conductivity, but also suppress the shuttle effect of polysulfides.

Few‐Layer MoS2 Nanosheets Encapsulated in N‐Doped Carbon Hollow Spheres as Long‐Life Anode Materials for Lithium‐Ion Batteries

“…To overcome these challenges, several methods have been proposed to enhance the lithium storage performance. One effective strategy is to tailor nanoscale MoS 2 with high surface‐to‐volume ratio, which could shorten the diffusion length of lithium ions and increase the active surface area . Unfortunately, considerable capacity fading caused by its intrinsic low electronic conductivity, aggregation, and pulverization on extended cycling cannot be avoided by mere nanostructure engineering.…”

“…One effectives trategyi st ot ailor nanoscale MoS 2 with high surfaceto-volumer atio, which could shorten the diffusion length of lithiumi ons and increaset he active surfacea rea. [13][14][15][16][17] Unfortunately,c onsiderable capacity fading caused by its intrinsic low electronic conductivity,a ggregation,a nd pulverization on extended cyclingcannotbeavoided by mere nanostructure engineering. Thus,a nother strategy of integrating nanostructured MoS 2 with highly conductive materials, such as graphene, [18][19][20] amorphous carbon, [21,22] carbon nanotubes (CNT), [23,24] and conductingp olymers, [25][26][27][28] has been proposed to solve the abovementioned problems.…”

Facile Synthesis of N‐Doped Hollow Carbon Spheres @MoS2 via Polymer Microspheres Template Method and One‐Step Calcination for Enhanced Hydrogen Evolution Reaction

“…The broad peak at 22.5° suggests that the PPY is amorphous structure. Pure MoS 2 in 13.9° and 33.3° and 58.9° has three salient diffraction peaks corresponding to the (002), (100) and (110) crystal plane of the hexagonal close packing of MoS 2 (2H‐MoS 2 , JCPDS 37‐1492) . Significantly, 13.9° diffraction peak of pure MoS 2 is more noticeable, indicating that the (002) crystal plane of pure MoS 2 stacks seriously.…”

Nanostructured metal chalcogenides confined in hollow structures for promoting energy storage

“…Reproduced from ref. 24, with permission from Wiley, 2018. theme of this review is conned hollow structures, details of these additives are not discussed herein. Sodium-ion batteries.…”