Stabilized cycling performance of silicon oxide anode in ionic liquid electrolyte for rechargeable lithium batteries

Song, Jinwoo; Nguyen, Cao Cuong; Song, Seung‐Wan

doi:10.1039/c2ra01183b

Cited by 47 publications

(35 citation statements)

References 36 publications

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“…The simple fabrication, scalability, low volume expansion and structural robustness of our previously reported nSi-cPAN architecture 19 make it an ideal candidate to merge with a suitable electrolyte system. In pursuit of a stable Si-electrolyte interface, the nSi-cPAN composite was cycled under galvanostatic conditions in RTILs comprising cation-anion combinations known for their cathodic stabilities against various negative electrode materials [29][30][31]36,[40][41][42] . The cycling performances of the Si-based electrode in RTIL solutions, including PYR 13 FSI (1.2 M LiFSI), PYR 13 TFSI (0.6 M LiTFSI) and EMIMFSI (1.2 M LiFSI), were directly compared with the electrode performance in the commercial EC/DEC (1 M LiPF 6 ) electrolyte.…”

Section: Resultsmentioning

confidence: 99%

“…Alternative electrolyte compositions [28][29][30][31] and active material surface treatments 32 have been studied in the effort to enhance SEI formation on high-capacity anode materials and improve half-cell CEs. In spite of these efforts, the CEs achieved throughout cycling are still insufficient for a long-lasting Si-based full-cell 31,[33][34][35] or the methods employed to manufacture the full-cells introduce large excesses of Li þ (4200%) into the system that serve to counterbalance the cell efficiency losses over long-term cycling [36][37][38] .…”

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confidence: 99%

“…While the compatibility of ILs with such materials has been proven, a clear understanding of their electrochemical properties and interfacial chemistries has not yet been developed. Moreover, relatively little work has been dedicated to the study of the compatibility between RTIL electrolytes and Si-based nanocomposite electrodes, with all published work in this field, to date, investigating Si-RTIL systems in thin film type electrodes [29][30][31] .…”

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Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

et al. 2015

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We are currently in the midst of a race to discover and develop new battery materials capable of providing high energy-density at low cost. By combining a high-performance Si electrode architecture with a room temperature ionic liquid electrolyte, here we demonstrate a highly energy-dense lithium-ion cell with an impressively long cycling life, maintaining over 75% capacity after 500 cycles. Such high performance is enabled by a stable half-cell coulombic efficiency of 99.97%, averaged over the first 200 cycles. Equally as significant, our detailed characterization elucidates the previously convoluted mechanisms of the solid-electrolyte interphase on Si electrodes. We provide a theoretical simulation to model the interface and microstructural-compositional analyses that confirm our theoretical predictions and allow us to visualize the precise location and constitution of various interfacial components. This work provides new science related to the interfacial stability of Si-based materials while granting positive exposure to ionic liquid electrochemistry.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

et al. 2015

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“…This nanohybrid shows a specific capacity in excess of 900 mA h g À1 after 50 discharge-charge cycles and a high Coulombic efficiency of 99.7 % at a rate of 1 C. Although plum-pudding nanohybrids have been found to be an effective structure for improving the electrochemical properties of the M IVA elements, their fabrication is not easy. In this context, many oxides, sulfides, or oxysulfides, including SiO x , [63][64][65][66] SnO 2 , [30,31,34,35,67,68] SnS, [69][70][71] SnS 2 , [72][73][74][75] and SnS 2 /SnO 2 , [76] have been studied as high-capacity anodes with improved cycling performance compared with their pristine elements. During the initial lithium-uptake process, the M IVA X a Y b compound can lithiate electrochemically, thus leading to the in situ formation of inactive components, which can also serve as the expected matrices to buffer the volume variation upon subsequent cycles.…”

Section: Plum-pudding Nanohybridsmentioning

confidence: 99%

Rational Design of Anode Materials Based on Group IVA Elements (Si, Ge, and Sn) for Lithium‐Ion Batteries

Guo

2013

Chemistry An Asian Journal

188

114

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Lithium-ion batteries (LIBs) represent the state-of-the-art technology in rechargeable energy-storage devices and they currently occupy the prime position in the marketplace for powering an increasingly diverse range of applications. However, the fast development of these applications has led to increasing demands being placed on advanced LIBs in terms of higher energy/power densities and longer life cycles. For LIBs to meet these requirements, researchers have focused on active electrode materials, owing to their crucial roles in the electrochemical performance of batteries. For anode materials, compounds based on Group IVA (Si, Ge, and Sn) elements represent one of the directions in the development of high-capacity anodes. Although these compounds have many significant advantages when used as anode materials for LIBs, there are still some critical problems to be solved before they can meet the high requirements for practical applications. In this Focus Review, we summarize a series of rational designs for Group IVA-based anode materials, in terms of their chemical compositions and structures, that could address these problems, that is, huge volume variations during cycling, unstable surfaces/interfaces, and invalidation of transport pathways for electrons upon cycling. These designs should at least include one of the following structural benefits: 1) Contain a sufficient number of voids to accommodate the volume variations during cycling; 2) adopt a "plum-pudding"-like structure to limit the volume variations during cycling; 3) facilitate an efficient and permanent transport pathway for electrons and lithium ions; or 4) show stable surfaces/interfaces to stabilize the in situ formed SEI layers.

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“…It was reported that surface layer derived from TFSA-based ionic liquids is composed of lithium fluoride (LiF), lithium carbonate (Li 2 CO 3 ), lithium sulfate (Li 2 SO 4 ), and lithium sulfite (Li 2 SO 3 ). 23 The Si electrodes in PP1MEM-TSFA and PP16-TFSA gave better cyclability: the capacities of over 1000 mA h g −1 were maintained even after 100th cycle. We were able to confirm the excellent reproducibility of anode performances in each case, and an advantage of utilization of ionic liquid electrolyte are obvious throughout the 100 cycles test (Figure 7).…”

Section: Resultsmentioning

confidence: 98%

Effect of Cation Structure of Ionic Liquids on Anode Properties of Si Electrodes for LIB

Shimizu

Usui

Matsumoto

et al. 2014

J. Electrochem. Soc.

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Ionic liquids consisted of 1-((2-methoxyethoxy)methyl)-1-methylpiperidinium (PP1MEM) or 1-hexyl-1-methylpiperidinium (PP16) and bis(trifluoromethanesulfonyl)amide (TFSA) were applied to an electrolyte for Li-ion battery. The effect of their cation structure on anode properties of Si electrodes were investigated through the use of thick film prepared by gas-deposition without any binder and conductive additive. The Si electrode in PP1MEM-TFSA exhibited an initial reversible capacity of 2670 mA h g −1 , which is larger than that in PP16-TFSA by ca. 900 mA h g −1 . Moreover, a comparatively high capacity of 1150 mA h g −1 at a high current density of 4200 mA g −1 is achieved in PP1MEM-TFSA whereas the Si electrode in PP16-TFSA showed the capacity of only 210 mA h g −1 . Raman analysis and electrochemical impedance measurements revealed that PP1MEM cation played a role reducing the interaction between Li ion and TFSA anions, and that Li-ion transfer at the electrode−electrolyte interface in PP1MEM-TFSA was remarkably improved compared with PP16-TFSA. These results indicate that the excellent performances obtained in PP1MEM-TFSA originate from a smooth Li-insertion into Si electrode. It was suggested that introduction of ether functional group into cation is valid to enhance the electrode performance.Li-ion battery (LIB) has been utilized in large-scale battery systems such as power supply of electric vehicles in recent years. Unfortunately, the conventional LIB using graphite anode has insufficient energy density to satisfy the growing demand. Silicon is one of promising candidates of anode materials for next-generation LIB due to its huge theoretical capacity compared with that of graphite practically used. Si and Li form several Li-rich binary alloy phases such as Li 15 Si 4 at room temperature and Li 22 Si 5 at a high temperature of 415 • C, which offers extremely high theoretical capacities of 3580 and 4200 mA h g −1 , respectively. 1-3 The volume of Si is, however, significantly changed during alloying/dealloying reactions. The volumetric change ratios per Si atom from Si to Li 15 Si 4 and Li 22 Si 5 correspond to 380% and 410%, which results in a generation of high stress and large strain in the active material. The strain accumulated by repeating charge−discharge cycle causes a disintegration of Si electrodes, leading to a rapid capacity fading and a poor cycle stability. In addition, Si has disadvantages of a low electrical conductivity and a low diffusion coefficient of Li + in it (D Li+ , 10 −14 to 10 −12 cm 2 s −1 ). 4-6 For these reasons, a practical application of Si electrodes has been hindered. To overcome these problems, considerable attempts have been carried out. Many researchers have studied composite materials consisted of carbon, with mechanically soft property and good electrical conductivity, and pure Si. 7-10 We have recently demonstrated that composite electrodes prepared by using LaSi 2 /Si and Ni−P/Si exhibit a high anode performance because LaSi 2 and Ni−P effectively compensate for silico...

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Stabilized cycling performance of silicon oxide anode in ionic liquid electrolyte for rechargeable lithium batteries

Cited by 47 publications

References 36 publications

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

Rational Design of Anode Materials Based on Group IVA Elements (Si, Ge, and Sn) for Lithium‐Ion Batteries

Effect of Cation Structure of Ionic Liquids on Anode Properties of Si Electrodes for LIB

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