Facile preparation of core-shell Si@Li4Ti5O12 nanocomposite as large-capacity lithium-ion battery anode

Liu, Mengjing; Gao, Hanyang; Hu, Guoxin; Zhu, Kunxu; Huang, Hao

doi:10.1016/j.jechem.2019.02.011

Cited by 41 publications

(14 citation statements)

References 47 publications

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“…These capacities can be matched well to the removal of 2.7 mole of Li per mole of Si. Also, it is worth mentioning that the capacity of Si-LTO-cPAN composite anode was higher than that the previously reported cases with modified SNPs [ 24 , 25 ].…”

Section: Resultsmentioning

confidence: 54%

“…The peaks corresponding to LTO in the Si-LTO and Si-LTO-c-PAN composite anodes indicate the formation of the cubic spinel structure after annealing in accordance with the JCPDS-49–0207. The characteristic peaks of anatase (TiO 2 ) and rutile (TiO) at 25.26° and 27.39° can also be noticed, which can form impurities in small amounts [ 24 ]. Thus, all peaks of the composites can be indexed as characteristic peaks of pure components, which indicates that SiNPs retained their original crystalline structure in the composite after heat treatment and the spinel structure of LTO was formed upon annealing.…”

Section: Resultsmentioning

confidence: 99%

“…To break through the limitations concerning SiNPs, Liu et al proposed a core-shell structured Si-LTO [ 24 ] while Lee and co-workers reported on a novel Si-based multicomponent design, which consist of the Si core and multifunctional shell layers [ 25 ]. The composite materials delivered high capacity suggesting that the coating helped to improve the performance providing stable structural integrity.…”

Section: Introductionmentioning

confidence: 99%

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Onion-Structured Si Anode Constructed with Coating by Li4Ti5O12 and Cyclized-Polyacrylonitrile for Lithium-Ion Batteries

et al. 2020

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Low dimensional Si-based materials are very promising anode candidates for the next-generation lithium-ion batteries. However, to satisfy the ever-increasing demand in more powerful energy storage devices, electrodes based on Si materials should display high-power accompanied with low volume change upon operation. Thus far, there were no reports on the Si-based materials which satisfy the stated requirements. Hence, here, we report on modified onion-structured Si nanoparticles (SiNPs) co-coated with Li4Ti5O12 (LTO) and cyclized polyacrylonitrile (cPAN) to bring the synergistic effect enhancing the conductivity, tolerance to volume change and stable performance. Obtained results suggest that the nanoparticles were conformally coated with both materials simultaneously and the thicknesses of the films were in a range of a few nanometers. Electrochemical tests show that the modified SiNPs deliver a high initial capacity of 2443 mAh g−1 and stable capacity retention over 50 cycles with 95% Coulombic efficiency.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Onion-Structured Si Anode Constructed with Coating by Li4Ti5O12 and Cyclized-Polyacrylonitrile for Lithium-Ion Batteries

et al. 2020

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“…Amorphous silicon nanoparticles (NPs) can remain crack-resistant when their diameter is below 870 nm [ 19 , 20 ]. The most promising papers describing the electrode development by the silicon nanostructure formation present the nano Si/C stack multilayer prepared by the chemical vapor deposition (CVD) method [ 21 ], carbon hollow spheres with silicon NPs [ 22 ], silicon hollow spheres with carbon coating made through sacrificial core dissolution [ 23 ], silicon NPs embedded into graphite 3D matrix [ 24 ], silicon nano-pillars, nano-wires or self-sustainable porous silicon structures [ 25 , 26 , 27 ], composites with graphite [ 28 ] or lithium titanium oxide [ 29 ] and graphene layers [ 30 ]. Nanostructures containing empty space (e.g., pillars, wires) are beneficial for the silicon cycle life, because they provide the space for an unrestricted volume change without electrode macro-structure degradation.…”

Section: Introductionmentioning

confidence: 99%

“…Composites of silicon with other active materials prepared by a standard slurry method commonly result in a lower SEI formation charge, but also in a lower initial capacity (due to their much lower Si content) and a poor cycle life. A typical composite capacity retention is about 65–75% after 100 cycles [ 29 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Surface Oxidation of Nano-Silicon as a Method for Cycle Life Enhancement of Li-ion Active Materials

et al. 2020

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Among the many studied Li-ion active materials, silicon presents the highest specific capacity, however it suffers from a great volume change during lithiation. In this work, we present two methods for the chemical modification of silicon nanoparticles. Both methods change the materials’ electrochemical characteristics. The combined XPS and SEM results show that the properties of the generated silicon oxide layer depend on the modification procedure employed. Electrochemical characterization reveals that the formed oxide layers show different susceptibility to electro-reduction during the first lithiation. The single step oxidation procedure resulted in a thin and very stable oxide that acts as an artificial SEI layer during electrode operation. The removal of the native oxide prior to further reactions resulted in a very thick oxide layer formation. The created oxide layers (both thin and thick) greatly suppress the effect of silicon volume changes, which significantly reduces electrode degradation during cycling. Both modification techniques are relatively straightforward and scalable to an industrial level. The proposed modified materials reveal great applicability prospects in next generation Li-ion batteries due to their high specific capacity and remarkable cycling stability.

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Silicon‐Based Lithium Ion Battery Systems: State‐of‐the‐Art from Half and Full Cell Viewpoint

Guo

Dong

Wang

et al. 2021

Adv Funct Materials

107

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Lithium‐ion batteries (LIBs) have been occupying the dominant position in energy storage devices. Over the past 30 years, silicon (Si)‐based materials are the most promising alternatives for graphite as LIB anodes due to their high theoretical capacities and low operating voltages. Nevertheless, their extensive volume changes in battery operation causes the structural collapse of Si‐based electrodes, as well as severe side reactions. In this review, the preparation methods and structure optimizations of Si‐based materials are highlighted, as well as their applications in half and full cells. Meanwhile, the developments of promising electrolytes, binders and separators that match Si‐based electrodes in half and full cells have made great progress. Pre‐lithiation technology has been introduced to compensate for irreversible Li+ consumption during battery operation, thereby improving the energy densities and lifetime of Si‐based full cells. More importantly, almost all related mechanisms of Si‐based electrodes in half and full cells are summarized in detail. It is expected to provide a comprehensive insight on how to develop high‐performance Si‐based full cells. The work can help us understand what happens during the lithiation process, the primary causes of Si‐based half and full cells failure, and strategies to overcome these challenges.

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Facile preparation of core-shell Si@Li4Ti5O12 nanocomposite as large-capacity lithium-ion battery anode

Cited by 41 publications

References 47 publications

Onion-Structured Si Anode Constructed with Coating by Li4Ti5O12 and Cyclized-Polyacrylonitrile for Lithium-Ion Batteries

Onion-Structured Si Anode Constructed with Coating by Li4Ti5O12 and Cyclized-Polyacrylonitrile for Lithium-Ion Batteries

Surface Oxidation of Nano-Silicon as a Method for Cycle Life Enhancement of Li-ion Active Materials

Silicon‐Based Lithium Ion Battery Systems: State‐of‐the‐Art from Half and Full Cell Viewpoint

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