Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

Jin, Dun; Yang, Xianfeng; Ou, Yuqing; Rao, Mumin; Zhong, Yisen; Zhou, Guangmin; Ye, Daiqi; Qiu, Yongcai; Wu, Yuping; Li, Weishan

doi:10.1016/j.scib.2019.12.005

Cited by 55 publications

(31 citation statements)

References 44 publications

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“…The initial discharge capacities of CoSe 2 @NC/HMCS and CoSe 2 /HMCS composites are 675 and 689 mAh g −1 , the initial charging capacities are 448 and 472 mAh g −1 , and the initial coulombic efficiencies (CEs) are 66% and 68%, respectively. The low values of initial capacity and CE are mainly related to the formation of the SEI layers by electrolyte decomposition, which is proportional to the electrode surface area [ 49 , 50 ]. Figure 8 b shows the cycle performances of CoSe 2 @NC/HMCS and CoSe 2 /HMCS electrodes at a current density 0.1 A g −1 for 120 cycles.…”

Section: Resultsmentioning

confidence: 99%

MOF-Derived CoSe2@N-Doped Carbon Matrix Confined in Hollow Mesoporous Carbon Nanospheres as High-Performance Anodes for Potassium-Ion Batteries

2020

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In this work, a novel vacuum-assisted strategy is proposed to homogenously form Metal–organic frameworks within hollow mesoporous carbon nanospheres (HMCSs) via a solid-state reaction. The method is applied to synthesize an ultrafine CoSe2 nanocrystal@N-doped carbon matrix confined within HMCSs (denoted as CoSe2@NC/HMCS) for use as advanced anodes in high-performance potassium-ion batteries (KIBs). The approach involves a solvent-free thermal treatment to form a Co-based zeolitic imidazolate framework (ZIF-67) within the HMCS templates under vacuum conditions and the subsequent selenization. Thermal treatment under vacuum facilitates the infiltration of the cobalt precursor and organic linker into the HMCS and simultaneously transforms them into stable ZIF-67 particles without any solvents. During the subsequent selenization process, the “dual confinement system”, composed of both the N-doped carbon matrix derived from the organic linker and the small-sized pores of HMCS, can effectively suppress the overgrowth of CoSe2 nanocrystals. Thus, the resulting uniquely structured composite exhibits a stable cycling performance (442 mAh g−1 at 0.1 A g−1 after 120 cycles) and excellent rate capability (263 mAh g−1 at 2.0 A g−1) as the anode material for KIBs.

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Section: Resultsmentioning

confidence: 99%

MOF-Derived CoSe2@N-Doped Carbon Matrix Confined in Hollow Mesoporous Carbon Nanospheres as High-Performance Anodes for Potassium-Ion Batteries

2020

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“…The spikes at 505 and 936 cm −1 correspond to Si−Si bonds in crystalline Si [33−34]. The peak at 667 cm −1 corresponds to Co and its derivatives [29]. The enlarged peaks located at 1341 and 1584 cm −1 are assignable to the D and G bands of graphitized carbon materials, respectively, with the intensity ratio of D to G of 1.1 indicating the formation of short-range-ordered carbon [35].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the conductivity of MOF-derived carbon material must be improved when used as a coating material. Moreover, based on previous reports and our preliminary study, it is difficult to encapsulate nano-Si into the crystal of a MOF completely using conventional methods; as a result, more effective and feasible methods are required [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

A chain-like compound of Si@CNT nanostructures and MOF-derived porous carbon as an anode for Li-ion batteries

Qiao

Zhang

et al. 2021

Int J Miner Metall Mater

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Silicon anodes are considered to have great prospects for use in batteries; however, many of their defects still need to be improved. The preparation of hybrid materials based on porous carbon is one of the effective ways to alleviate the adverse impact resulting from the volume change and the inferior electronic conductivity of a silicon electrode. Herein, a chain-like carbon cluster structure is prepared, in which MOF-derived porous carbon acts as a shell structure to integrally encapsulate Si nanoparticles, and CNTs play a role in connecting carbon shells. Based on the exclusive structure, the carbon shell can accommodate the volume expansion more effectively, and CNTs can improve the overall stability and conductivity. The resulting composite reveals excellent rate capacity and enhanced cycling stability; in particular, a capacity of 732 mA•h•g −1 at 2 A•g −1 is achieved with a reservation rate of 72.3% after cycling 100 times at 1 A•g −1 .

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“…Li et al [52] employed a similar strategy and prepared N-and Co-doped hollow-structured Si/C composite (Si@Co-NC) with Si@ZIF-67 precursor, which delivered a reversible capacity of 191 mAh g −1 at 1 A g −1 after 3000 cycles. Jin et al [53] pyrolyzed Si@ZIF-67 under a hydrogen atmosphere, which led to the formation of metallic Co that catalyzed the conversion of organic residual units of the collapsed ZIF-67 network into carbon nanotubes (CNTs). The obtained Si@N-doped CNTs delivered 1144 mAh g −1 capacity at 1 A g −1 over 750 cycles.…”

Section: Metal-organic Frameworkmentioning

confidence: 99%

Recent Applications of Molecular Structures at Silicon Anode Interfaces

Chen¹,

Liu²

2021

Electrochem

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Silicon (Si) is a promising anode material to realize many-fold higher anode capacity in next-generation lithium-ion batteries (LIBs). Si electrochemistry has strong dependence on the property of the Si interface, and therefore, Si surface engineering has attracted considerable research interest to address the challenges of Si electrodes such as dramatic volume changes and the high reactivity of Si surface. Molecular nanostructures, including metal–organic frameworks (MOFs), covalent–organic frameworks (COFs) and monolayers, have been employed in recent years to decorate or functionalize Si anode surfaces to improve their electrochemical performance. These materials have the advantages of facile preparation, nanoscale controllability and structural diversity, and thus could be utilized as versatile platforms for Si surface modification. This review aims to summarize the recent applications of MOFs, COFs and monolayers for Si anode development. The functionalities and common design strategies of these molecular structures are demonstrated.

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Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

Cited by 55 publications

References 44 publications

MOF-Derived CoSe2@N-Doped Carbon Matrix Confined in Hollow Mesoporous Carbon Nanospheres as High-Performance Anodes for Potassium-Ion Batteries

MOF-Derived CoSe2@N-Doped Carbon Matrix Confined in Hollow Mesoporous Carbon Nanospheres as High-Performance Anodes for Potassium-Ion Batteries

A chain-like compound of Si@CNT nanostructures and MOF-derived porous carbon as an anode for Li-ion batteries

Recent Applications of Molecular Structures at Silicon Anode Interfaces

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