Porous TiO2 urchins for high performance Li-ion battery electrode: Facile synthesis, characterization and structural evolution

Yi Cai, Hong En Wang, Shao Zhuan Huang, Muk Fung Yuen, Heng Hui Cai, Chao Wang, Yong Yu, Yu Li, Wen Jun Zhang, Bao Lian Su

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Porous TiO2 urchins have been synthesized by a hydrothermal route using TiO2/oleylamine as precursors with subsequent ion-exchange and calcination. The resultant material consists of porous spherical cores and nanochains-constructed shells with straight channels. Electrochemical measurements indicate the TiO2 urchins deliver superior lithium storage capability in terms of high capacity (206.2 mA h g-1 at 0.5 C), superior rate performance (94.4 mA h g-1 at 20 C) and stable cycling stability (94.3% capacity retention over 1000 cycles at 10 C versus the third cycle). Such performance enhancement is mainly due to the increased electrode/electrolyte contact interface, reduced Li+ diffusion pathways and improved mass transfer of electrolyte in the unique 3D interconnected hierarchical network. In addition, ex-situ XRD, SEM and TEM analyses further reveal high structure integrity of the porous TiO2 urchins during the electrochemical lithiation, leading to enhanced lithium storage stability. Moreover, we detected that some anatase nanocrystals evolved into electrochemically inactive Li1TiO2 dots (∼10 nm in size) during long-term electrochemical cycling. Our findings provide more insights for better understanding of the structure evolution and capacity decay mechanism in porous TiO2 nanostructures.

langue originaleAnglais
Pages (de - à)206-214
Nombre de pages9
journalElectrochimica Acta
Volume210
Les DOIs
étatPublié - 20 août 2016

Empreinte digitale

Lithium
Electrolytes
Electrodes
Calcination
Titanium dioxide
Nanocrystals
Nanostructures
Ion exchange
Mass transfer
Transmission electron microscopy
Scanning electron microscopy
Lithium-ion batteries
titanium dioxide
oleylamine

Citer ceci

Cai, Yi ; Wang, Hong En ; Huang, Shao Zhuan ; Yuen, Muk Fung ; Cai, Heng Hui ; Wang, Chao ; Yu, Yong ; Li, Yu ; Zhang, Wen Jun ; Su, Bao Lian. / Porous TiO2 urchins for high performance Li-ion battery electrode : Facile synthesis, characterization and structural evolution. Dans: Electrochimica Acta. 2016 ; Vol 210. p. 206-214.
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abstract = "Porous TiO2 urchins have been synthesized by a hydrothermal route using TiO2/oleylamine as precursors with subsequent ion-exchange and calcination. The resultant material consists of porous spherical cores and nanochains-constructed shells with straight channels. Electrochemical measurements indicate the TiO2 urchins deliver superior lithium storage capability in terms of high capacity (206.2 mA h g-1 at 0.5 C), superior rate performance (94.4 mA h g-1 at 20 C) and stable cycling stability (94.3{\%} capacity retention over 1000 cycles at 10 C versus the third cycle). Such performance enhancement is mainly due to the increased electrode/electrolyte contact interface, reduced Li+ diffusion pathways and improved mass transfer of electrolyte in the unique 3D interconnected hierarchical network. In addition, ex-situ XRD, SEM and TEM analyses further reveal high structure integrity of the porous TiO2 urchins during the electrochemical lithiation, leading to enhanced lithium storage stability. Moreover, we detected that some anatase nanocrystals evolved into electrochemically inactive Li1TiO2 dots (∼10 nm in size) during long-term electrochemical cycling. Our findings provide more insights for better understanding of the structure evolution and capacity decay mechanism in porous TiO2 nanostructures.",
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author = "Yi Cai and Wang, {Hong En} and Huang, {Shao Zhuan} and Yuen, {Muk Fung} and Cai, {Heng Hui} and Chao Wang and Yong Yu and Yu Li and Zhang, {Wen Jun} and Su, {Bao Lian}",
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Porous TiO2 urchins for high performance Li-ion battery electrode : Facile synthesis, characterization and structural evolution. / Cai, Yi; Wang, Hong En; Huang, Shao Zhuan; Yuen, Muk Fung; Cai, Heng Hui; Wang, Chao; Yu, Yong; Li, Yu; Zhang, Wen Jun; Su, Bao Lian.

Dans: Electrochimica Acta, Vol 210, 20.08.2016, p. 206-214.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Porous TiO2 urchins for high performance Li-ion battery electrode

T2 - Facile synthesis, characterization and structural evolution

AU - Cai, Yi

AU - Wang, Hong En

AU - Huang, Shao Zhuan

AU - Yuen, Muk Fung

AU - Cai, Heng Hui

AU - Wang, Chao

AU - Yu, Yong

AU - Li, Yu

AU - Zhang, Wen Jun

AU - Su, Bao Lian

PY - 2016/8/20

Y1 - 2016/8/20

N2 - Porous TiO2 urchins have been synthesized by a hydrothermal route using TiO2/oleylamine as precursors with subsequent ion-exchange and calcination. The resultant material consists of porous spherical cores and nanochains-constructed shells with straight channels. Electrochemical measurements indicate the TiO2 urchins deliver superior lithium storage capability in terms of high capacity (206.2 mA h g-1 at 0.5 C), superior rate performance (94.4 mA h g-1 at 20 C) and stable cycling stability (94.3% capacity retention over 1000 cycles at 10 C versus the third cycle). Such performance enhancement is mainly due to the increased electrode/electrolyte contact interface, reduced Li+ diffusion pathways and improved mass transfer of electrolyte in the unique 3D interconnected hierarchical network. In addition, ex-situ XRD, SEM and TEM analyses further reveal high structure integrity of the porous TiO2 urchins during the electrochemical lithiation, leading to enhanced lithium storage stability. Moreover, we detected that some anatase nanocrystals evolved into electrochemically inactive Li1TiO2 dots (∼10 nm in size) during long-term electrochemical cycling. Our findings provide more insights for better understanding of the structure evolution and capacity decay mechanism in porous TiO2 nanostructures.

AB - Porous TiO2 urchins have been synthesized by a hydrothermal route using TiO2/oleylamine as precursors with subsequent ion-exchange and calcination. The resultant material consists of porous spherical cores and nanochains-constructed shells with straight channels. Electrochemical measurements indicate the TiO2 urchins deliver superior lithium storage capability in terms of high capacity (206.2 mA h g-1 at 0.5 C), superior rate performance (94.4 mA h g-1 at 20 C) and stable cycling stability (94.3% capacity retention over 1000 cycles at 10 C versus the third cycle). Such performance enhancement is mainly due to the increased electrode/electrolyte contact interface, reduced Li+ diffusion pathways and improved mass transfer of electrolyte in the unique 3D interconnected hierarchical network. In addition, ex-situ XRD, SEM and TEM analyses further reveal high structure integrity of the porous TiO2 urchins during the electrochemical lithiation, leading to enhanced lithium storage stability. Moreover, we detected that some anatase nanocrystals evolved into electrochemically inactive Li1TiO2 dots (∼10 nm in size) during long-term electrochemical cycling. Our findings provide more insights for better understanding of the structure evolution and capacity decay mechanism in porous TiO2 nanostructures.

KW - anode materials

KW - electrochemistry

KW - Li ion battery

KW - porous structure

KW - TiO

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