Bi₂MoO₆Microsphere with Double-Polyaniline Layers toward Ultrastable Lithium Energy Storage by Reinforced Structure

Abstract

Given its competitive theoretical capacity, Bi2MoO6 is deemed as a promising anode material for the realization of efficient Li storage. Considering the severe capacity attenuation caused by the lithiation-induced expansion, it is essential to introduce effective modification. Remarkably, in this work, Bi2MoO6 microsphere with double-layered spherical shells are successfully prepared, and the polyaniline are coated on both inner and outer surfaces of double-layered spherical shells, working as buffer layers to strain the volume expansion during electrochemical cycling. Inspiringly, when utilized as anode in LIBs, the specific capacity of Bi2MoO6@PANI is maintained at 656.3 mAh g–1 after 200 cycles at 100 mA g–1, corresponding to a high capacity of 82%. However, the counterpart of individual Bi2MoO6 is only 36%. This result confirms that the polyaniline layer can dramatically promote stable cycling performances. Supported by in situ EIS and ex situ technologies followed by detailed analysis, the enhanced pseudocapacitance-dominated contributions and electron/ion transfer rate, benefiting from the combination with polyaniline, are further proved. This work confirms the significant effect of polyaniline on the ultrastable energy storage, further providing an in-depth sight on the impacts of polyaniline coating to the electrical conductivity as well as the resistances of electron/ion transport.

Bi Dots Confined by Functional Carbon as High‐Performance Anode for Lithium Ion Batteries

“…On the contrary, b values are higher than 0.75 (marked in blue points) when potential keeps away from the center of peak, which suggests the capacitive domination in nondealloy district. [ 55,56 ] And this phenomenon is reappeared in lithiation process (Figure S9, Supporting Information). The results ulteriorly verify that alloy/dealloy mechanism for Li storage in the Bi/C composites in this work is mainly dominated by diffusion behavior accompanied with surface‐driven pseudocapacitive action in non‐peak areas.…”

Ultra-stable Sb confined into N-doped carbon fibers anodes for high-performance potassium-ion batteries

“…These results indicate the capacitancecontrolled process for the Sb@CN nanofiber electrode and the diffusion-controlled process for commercialized Sb electrode. Furthermore, the ratio of diffusion-controlled (k 1 v 1/2 ) and capacitancecontrolled (k 2 v) current can be evaluated by the following [63][64][65][66][67][68] i…”

Plate-to-Layer Bi2MoO6/MXene-Heterostructured Anode for Lithium-Ion Batteries

“…2 b, S3a, b) with a lattice spacing of 0.277 nm, corresponding to the (200) plane of orthorhombic Bi 2 MoO 6 (Fig. S3c) [ 31 ]. Its structure was further confirmed by the EDS mappings, which show a rough proportion of Bi, Mo, and O elements, coupled with the uniform distribution (Fig.…”

“…All the electrodes show irreversible peaks at around 1.65, 1.26, and 0.58 V in the first cathodic scan, which could be attributed to the insertion of Li + into layer structure of the Bi 2 MoO 6 crystal, the irreversible transformation from Bi 2 MoO 6 to Bi and Mo metal (Eq. 2), the electrolyte decomposition, and formation of solid electrolyte interface (SEI) coupled with the alloying transformation from Bi to Li 3 Bi, respectively [29][30][31]. Especially, the board peak at 0.58 V was subsequently split into several minor peaks, corresponding to the lithiation process of Bi to LiBi (Eq.…”

“…When used as anode material, the main restricts of Bi 2 MoO 6 are similar to those of other TMOs, i.e., the large volume change during lithiation/delithiation and the intrinsic low conductivity. Thus, the strategies of rational design on the structure and combination with conductive materials can also be employed for improving electrochemical performances of Bi 2 MoO 6 electrode material [27][28][29][30][31]. For example, Zhai et al [28] reported a Bi 2 MoO 6 /reduced graphene oxide (rGO) composite based on the in situ growth of Bi 2 MoO 6 on the rGO substrate, in which the rGO provides high conductivity and is beneficial for exposing the active sites and alleviating the volume change of Bi 2 MoO 6 .…”