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Amorphous TiO2 Shells: A Vital Elastic Buffering Layer on Silicon Nanoparticles for High‐Performance and Safe Lithium Storage

Smart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium‐ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessmen... Full description

Journal Title: Advanced Materials December 2017, Vol.29(48), pp.n/a-n/a
Main Author: Yang, Jianping
Other Authors: Wang, Yunxiao , Li, Wei , Wang, Lianjun , Fan, Yuchi , Jiang, Wan , Luo, Wei , Wang, Yang , Kong, Biao , Selomulya, Cordelia , Liu, Hua Kun , Dou, Shi Xue , Zhao, Dongyuan
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ID: ISSN: 0935-9648 ; E-ISSN: 1521-4095 ; DOI: 10.1002/adma.201700523
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recordid: wj10.1002/adma.201700523
title: Amorphous TiO2 Shells: A Vital Elastic Buffering Layer on Silicon Nanoparticles for High‐Performance and Safe Lithium Storage
format: Article
creator:
  • Yang, Jianping
  • Wang, Yunxiao
  • Li, Wei
  • Wang, Lianjun
  • Fan, Yuchi
  • Jiang, Wan
  • Luo, Wei
  • Wang, Yang
  • Kong, Biao
  • Selomulya, Cordelia
  • Liu, Hua Kun
  • Dou, Shi Xue
  • Zhao, Dongyuan
subjects:
  • Core–Shell Structures
  • Lithium‐Ion Batteries
  • Silicon Nanoparticles
  • Sol–Gel Coatings
  • Titanium Oxide
ispartof: Advanced Materials, December 2017, Vol.29(48), pp.n/a-n/a
description: Smart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium‐ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessment. In this study, a facile sol–gel strategy is demonstrated to synthesize commercial Si nanoparticles encapsulated by amorphous titanium oxide (TiO), with core–shell structures, which show greatly superior electrochemical performance and high‐safety lithium storage. The amorphous TiO shell (≈3 nm) shows elastic behavior during lithium discharging and charging processes, maintaining high structural integrity. Interestingly, it is found that the amorphous TiO shells offer superior buffering properties compared to crystalline TiO layers for unprecedented cycling stability. Moreover, accelerating rate calorimetry testing reveals that the TiO‐encapsulated Si nanoparticles are safer than conventional carbon‐coated Si‐based anodes. , with a core–shell structure, deliver superior electrochemical performance and high‐safety lithium storage. The amorphous TiO shells can offer superior buffering properties and achieve excellent lithium‐storage properties with high initial Coulombic efficiency, long‐term cycling stability, and greater safety.
language:
source:
identifier: ISSN: 0935-9648 ; E-ISSN: 1521-4095 ; DOI: 10.1002/adma.201700523
fulltext: fulltext
issn:
  • 0935-9648
  • 09359648
  • 1521-4095
  • 15214095
url: Link


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titleAmorphous TiO2 Shells: A Vital Elastic Buffering Layer on Silicon Nanoparticles for High‐Performance and Safe Lithium Storage
creatorYang, Jianping ; Wang, Yunxiao ; Li, Wei ; Wang, Lianjun ; Fan, Yuchi ; Jiang, Wan ; Luo, Wei ; Wang, Yang ; Kong, Biao ; Selomulya, Cordelia ; Liu, Hua Kun ; Dou, Shi Xue ; Zhao, Dongyuan
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subjectCore–Shell Structures ; Lithium‐Ion Batteries ; Silicon Nanoparticles ; Sol–Gel Coatings ; Titanium Oxide
descriptionSmart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium‐ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessment. In this study, a facile sol–gel strategy is demonstrated to synthesize commercial Si nanoparticles encapsulated by amorphous titanium oxide (TiO), with core–shell structures, which show greatly superior electrochemical performance and high‐safety lithium storage. The amorphous TiO shell (≈3 nm) shows elastic behavior during lithium discharging and charging processes, maintaining high structural integrity. Interestingly, it is found that the amorphous TiO shells offer superior buffering properties compared to crystalline TiO layers for unprecedented cycling stability. Moreover, accelerating rate calorimetry testing reveals that the TiO‐encapsulated Si nanoparticles are safer than conventional carbon‐coated Si‐based anodes. , with a core–shell structure, deliver superior electrochemical performance and high‐safety lithium storage. The amorphous TiO shells can offer superior buffering properties and achieve excellent lithium‐storage properties with high initial Coulombic efficiency, long‐term cycling stability, and greater safety.
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titleAmorphous TiO2 Shells: A Vital Elastic Buffering Layer on Silicon Nanoparticles for High‐Performance and Safe Lithium Storage
descriptionSmart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium‐ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessment. In this study, a facile sol–gel strategy is demonstrated to synthesize commercial Si nanoparticles encapsulated by amorphous titanium oxide (TiO), with core–shell structures, which show greatly superior electrochemical performance and high‐safety lithium storage. The amorphous TiO shell (≈3 nm) shows elastic behavior during lithium discharging and charging processes, maintaining high structural integrity. Interestingly, it is found that the amorphous TiO shells offer superior buffering properties compared to crystalline TiO layers for unprecedented cycling stability. Moreover, accelerating rate calorimetry testing reveals that the TiO‐encapsulated Si nanoparticles are safer than conventional carbon‐coated Si‐based anodes. , with a core–shell structure, deliver superior electrochemical performance and high‐safety lithium storage. The amorphous TiO shells can offer superior buffering properties and achieve excellent lithium‐storage properties with high initial Coulombic efficiency, long‐term cycling stability, and greater safety.
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abstractSmart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium‐ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessment. In this study, a facile sol–gel strategy is demonstrated to synthesize commercial Si nanoparticles encapsulated by amorphous titanium oxide (TiO), with core–shell structures, which show greatly superior electrochemical performance and high‐safety lithium storage. The amorphous TiO shell (≈3 nm) shows elastic behavior during lithium discharging and charging processes, maintaining high structural integrity. Interestingly, it is found that the amorphous TiO shells offer superior buffering properties compared to crystalline TiO layers for unprecedented cycling stability. Moreover, accelerating rate calorimetry testing reveals that the TiO‐encapsulated Si nanoparticles are safer than conventional carbon‐coated Si‐based anodes. , with a core–shell structure, deliver superior electrochemical performance and high‐safety lithium storage. The amorphous TiO shells can offer superior buffering properties and achieve excellent lithium‐storage properties with high initial Coulombic efficiency, long‐term cycling stability, and greater safety.
doi10.1002/adma.201700523
pages1-7
date2017-12