Porous Metal–Organic Frameworks for Enhanced Performance Silicon Anodes in Lithium-Ion Batteries

Malik, Romeo; Loveridge, Melanie; Williams, Luke J.; Huang, Qianye; West, Geoff; Shearing, Paul R.; Bhagat, Rohit; Walton, Richard I.

doi:10.1021/acs.chemmater.9b00933

Cited by 38 publications

(56 citation statements)

References 42 publications

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“…In Si-dominant electrodes (Formulation B), merging among the particles in the cycled electrodes can also be seen. This is most likely to result from the huge volume expansion and electrochemical fusion of particles -similar to observations made in previous studies [32,44,87]. Despite the coalescence of SiNPs after cycling, cycled Si-FLGWJM electrodes were found to retain their porous 3D morphology (Figure 4c).…”

Section: Morphology Evolutionsupporting

confidence: 85%

“…In this sense, these pores also help to maintain sufficient void structure around the active particles proving "ion-conducting channels" to the electrode architecture [44]. Reduced porosity or increased tortuosity may adversely affect the lithium permeability and diffusion into the active material, resulting in capacity loss [44]. The observation of cracks on the electrode surface is consistent with previously reportedstudies [32,44,88,89].…”

Section: Morphology Evolutionsupporting

confidence: 81%

“…This interconnected porous framework is suggested to stably accommodate the volume expansion strains from SiNPs to facilitate and maintain transportation of electron and ions, in a mechanically robust microstructure. The evidence for this is based on studies of electrochemical impedance spectroscopy (EIS) combined with physical characterisation techniques able to image and quantify, over multiplescales, the evolution of internal morphology and the build-up of resistance [44].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries

et al. 2020

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While silicon-based negative electrode materials have been extensively studied, to develop high capacity lithium-ion batteries, implementing a large-scale production method that can be easily transferred to industy, has been a crucial challenge. Here, a scalable wet-jet milling method was developed to prepare a silicon-graphene hybrid material to be used as negative electrode in lithium-ion batteries. This synthesized composite, when used as an anode in lithium cells, demonstrated high Li ion storage capacity, long cycling stability and high-rate capability. In particular, the electrode exhibited a reversible discharge capacity exceeding 1763 mAh g-1 after 450 cycles with a capacity retention of 98% and a coulombic efficiency of 99.85% (with a current density of 358 mA g-1). This significantly supersedes the performance of a Si-dominant electrode structures. The capacity fade rate after 450 cycles was only 0.005% per cycle in the 0.05-1 V range. This superior electrochemical performance is ascribed to the highly layered, silicon-graphene porous structure, as investigated via focused ion beam in conjunction with scanning electron microscopy (FIB-SEM) tomography. The hybrid electrode could retain 89% of its porosity (under a current density of 358 mA g-1) after 200 cycles compared with only 35% in a Si-dominant electrode. Moreover, this morphology can not only accommodate the large volume strains from active silicon particles, but also maintains robust electrical connectivity. This confers faster transportation of electrons and ions with significant permeation of electrolyte within the electrode. Physicochemical characterisations were performed to further correlate the electrochemical performance with the microstructural dynamics. The excellent performance of the hybrid material along with the scalability of the synthesizing process is a step forward to realize high capacity/energy density lithium-ion batteries for multiple device applications.

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Section: Morphology Evolutionsupporting

confidence: 85%

Section: Morphology Evolutionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries

et al. 2020

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“…Other composites containing a small amount of Si, such as MnO/Mn 2 SiO 4 @C, Si y Sn 1‐y O x @C, also exhibit higher specific capacity and cycle stability . When silicon particles are inserted into the metal‐organic framework conductive network, the porous structure facilitates the transport of lithium ions and improves the conductive properties of the material . Overall, silicon@metal@carbon composites, as well as silicon and other materials, have achieved excellent theoretical capacity.…”

Section: Silicon‐based Composite Materialsmentioning

confidence: 99%

Silicon Anodes for High‐Performance Storage Devices: Structural Design, Material Compounding, Advances in Electrolytes and Binders

Hou

Yang

2020

ChemNanoMat

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Silicon has an extremely high theoretical capacity, a low voltage platform, and abundant natural reserves. It is considered to be one of the most promising anode materials for lithium-ion batteries. However, there are still many problems with silicon as an anode material for lithium-ion batteries. During the lithiation/delithiation of silicon, a huge volume expansion occurs, causing the silicon particles to pulverize and the capacity to drop sharply. Furthermore, the continuous increase in the silicon surface solid electrolyte interphase (SEI) films and the poor conductivity of silicon affect the specific capacity of the battery. Means to improve silicon-based anodes with regard to electrode cycling performance and electrode capacity include structural design, composite preparation, or improvements in electrolytes and binders (for example, designing silicon nanomaterials of different dimensions from 0D to 3D, including silicon nanoparticles, nanowires, nanorods, thin films, porous silicon, and core-shell structures). Silicon has been combined with different materials to buffer its own volume expansion, resulting in excellent performance. In addition, the design of a reasonable electrolyte solution, as well as the development of a selfhealing binder is one of the main methods to improve Sibased anodes. In recent years, sodium/potassium ion batteries have been increasingly studied, and silicon and sodium/potassium can be alloyed. The corresponding theoretical capacity can reach 954 mAh g À 1 and 955 mAh g À 1 , respectively. Advances in silicon-based anodes for sodium/ potassium ion storage are summarized herein.ductility. [25] It can increase the conductivity of silicon and adapt to the large volume expansion of silicon. In addition, some are compounded with silicon or metal or metal oxides. Such as copper, silver, tin oxide and titanium oxide. [39][40][41][42][43][44] In addition to changing the silicon's own morphological structure and preparing composite materials, the design and selection of electrolytes and binders is to improve the performance of silicon-based electrodes from the outside. By selecting the appropriate electrolytes, the electrode materials can be effectively reduced deterioration. At present, various additive-modified organic solvent electrolytes, ionic liquid electrolytes, and all-solid electrolytes are widely used in silicon-based anodes. [45][46][47][48] In addition, it is widely applicable to the binder polyvinylidene fluoride(PVDF) of lithium ion battery electrode materials, but

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“…[9][10][11] UiO-67 can maintain the physical integrity of electrode microstructures and mitigate the rate of anode degradation that presently limits the lifetime of anodes. 12 Furthermore, some strategies for applying UiO-67 in photocatalysis are usually to load photoactive species comprising multicomponent molecular Re, Ru or Ir complexes into its structure, resulting in higher quantum efficiency or turnover number. [13][14][15][16][17][18] However, MOFs with good light absorption performance are limited because of their inherent broad energy band.…”

Section: Introductionmentioning

confidence: 99%

UiO-67 metal–organic gel material deposited on photonic crystal matrix for photoelectrocatalytic hydrogen production

et al. 2020

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Porous Metal–Organic Frameworks for Enhanced Performance Silicon Anodes in Lithium-Ion Batteries

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 38 publications

References 42 publications

Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries

Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries

Silicon Anodes for High‐Performance Storage Devices: Structural Design, Material Compounding, Advances in Electrolytes and Binders

UiO-67 metal–organic gel material deposited on photonic crystal matrix for photoelectrocatalytic hydrogen production

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