Electrochemical Performance of GeO2/C Core Shell based Electrodes for Li-ion Batteries

Duc Tung Ngo; Ramchandra S. Kalubarme; M. G. Chourashiya; Choong Nyeon Park; Chan Jin Park

doi:10.1016/j.electacta.2013.11.031

Electrochemical Performance of GeO₂/C Core Shell based Electrodes for Li-ion Batteries

Duc Tung Ngo, Ramchandra S. Kalubarme, M. G. Chourashiya, Choong Nyeon Park, Chan Jin Park^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

In the present study, a nanocrystalline GeO₂/C core shell was synthesized by a cost-effective and simple citric-gel method for various parameters, and the effects of these parameters on the microstructural and electrochemical properties of the GeO₂/C core shell were investigated. Thermo-gravimetric-analysis showed that the combustion of gel-complexes occurred in the temperature range from 178 to 247 C. Among the samples pre-heated at 150 C, the sample pre-heated for 4 h had the highest surface area (11.12 m² g^-1; particle size ∼ 30 nm). TEM analysis revealed that the citric-gel synthesized GeO₂ was encapsulated with carbon. This carbon encapsulation acted as a critical buffer layer against capacity degradation in the fabricated electrodes. The optimized sample showed a specific capacity of 738 mA h g^-1 and maintained its reversibility after 50 cycles at a capacity of 697 mA h g^-1. The electrode containing the optimized sample showed a reversible capacity of 530 mA h g^-1 at 1 C rate

Original language	English
Pages (from-to)	203-209
Number of pages	7
Journal	Electrochimica Acta
Volume	116
DOIs	https://doi.org/10.1016/j.electacta.2013.11.031
State	Published - 10 Jan 2014
Externally published	Yes

Keywords

Citric-gel method
Core-shell
Cyclability
Germanium dioxide
Lithium-ion batteries

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.electacta.2013.11.031

Cite this

@article{33583376c9a343eaa9ea41323285bbf7,

title = "Electrochemical Performance of GeO2/C Core Shell based Electrodes for Li-ion Batteries",

abstract = "In the present study, a nanocrystalline GeO2/C core shell was synthesized by a cost-effective and simple citric-gel method for various parameters, and the effects of these parameters on the microstructural and electrochemical properties of the GeO2/C core shell were investigated. Thermo-gravimetric-analysis showed that the combustion of gel-complexes occurred in the temperature range from 178 to 247 C. Among the samples pre-heated at 150 C, the sample pre-heated for 4 h had the highest surface area (11.12 m2 g-1; particle size ∼ 30 nm). TEM analysis revealed that the citric-gel synthesized GeO2 was encapsulated with carbon. This carbon encapsulation acted as a critical buffer layer against capacity degradation in the fabricated electrodes. The optimized sample showed a specific capacity of 738 mA h g-1 and maintained its reversibility after 50 cycles at a capacity of 697 mA h g-1. The electrode containing the optimized sample showed a reversible capacity of 530 mA h g-1 at 1 C rate",

keywords = "Citric-gel method, Core-shell, Cyclability, Germanium dioxide, Lithium-ion batteries",

author = "Ngo, {Duc Tung} and Kalubarme, {Ramchandra S.} and Chourashiya, {M. G.} and Park, {Choong Nyeon} and Park, {Chan Jin}",

note = "Funding Information: This research was supported by Basic Science Research Programs through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2012R1A2005977) and the Ministry of Science, ICT and Future Planning (No. 2009-0085441).",

year = "2014",

month = jan,

day = "10",

doi = "10.1016/j.electacta.2013.11.031",

language = "英语",

volume = "116",

pages = "203--209",

journal = "Electrochimica Acta",

issn = "0013-4686",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Electrochemical Performance of GeO2/C Core Shell based Electrodes for Li-ion Batteries

AU - Ngo, Duc Tung

AU - Kalubarme, Ramchandra S.

AU - Chourashiya, M. G.

AU - Park, Choong Nyeon

AU - Park, Chan Jin

N1 - Funding Information: This research was supported by Basic Science Research Programs through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2012R1A2005977) and the Ministry of Science, ICT and Future Planning (No. 2009-0085441).

PY - 2014/1/10

Y1 - 2014/1/10

N2 - In the present study, a nanocrystalline GeO2/C core shell was synthesized by a cost-effective and simple citric-gel method for various parameters, and the effects of these parameters on the microstructural and electrochemical properties of the GeO2/C core shell were investigated. Thermo-gravimetric-analysis showed that the combustion of gel-complexes occurred in the temperature range from 178 to 247 C. Among the samples pre-heated at 150 C, the sample pre-heated for 4 h had the highest surface area (11.12 m2 g-1; particle size ∼ 30 nm). TEM analysis revealed that the citric-gel synthesized GeO2 was encapsulated with carbon. This carbon encapsulation acted as a critical buffer layer against capacity degradation in the fabricated electrodes. The optimized sample showed a specific capacity of 738 mA h g-1 and maintained its reversibility after 50 cycles at a capacity of 697 mA h g-1. The electrode containing the optimized sample showed a reversible capacity of 530 mA h g-1 at 1 C rate

AB - In the present study, a nanocrystalline GeO2/C core shell was synthesized by a cost-effective and simple citric-gel method for various parameters, and the effects of these parameters on the microstructural and electrochemical properties of the GeO2/C core shell were investigated. Thermo-gravimetric-analysis showed that the combustion of gel-complexes occurred in the temperature range from 178 to 247 C. Among the samples pre-heated at 150 C, the sample pre-heated for 4 h had the highest surface area (11.12 m2 g-1; particle size ∼ 30 nm). TEM analysis revealed that the citric-gel synthesized GeO2 was encapsulated with carbon. This carbon encapsulation acted as a critical buffer layer against capacity degradation in the fabricated electrodes. The optimized sample showed a specific capacity of 738 mA h g-1 and maintained its reversibility after 50 cycles at a capacity of 697 mA h g-1. The electrode containing the optimized sample showed a reversible capacity of 530 mA h g-1 at 1 C rate

KW - Citric-gel method

KW - Core-shell

KW - Cyclability

KW - Germanium dioxide

KW - Lithium-ion batteries

UR - http://www.scopus.com/inward/record.url?scp=84889001486&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2013.11.031

DO - 10.1016/j.electacta.2013.11.031

M3 - 文章

AN - SCOPUS:84889001486

SN - 0013-4686

VL - 116

SP - 203

EP - 209

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -