High-rate Li4Ti5O12/N-doped reduced graphene oxide composite using cyanamide both as nanospacer and a nitrogen doping source

Jun Hui Jeong, Myeong Seong Kim, Young Hwan Kim, Kwang Chul Roh, Kwang Bum Kim

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A Li4Ti5O12(LTO)/N-doped reduced graphene oxide (RGO) composite is proposed using dual functional nitrogen doping source to prevent RGO restacking and achieve uniform nitrogen doping on RGO sheets to increase the rate performance of high-rate lithium ion batteries. The pore structure (both meso- and macro pores) is developed when RGO restacking is prevented, facilitating electrolyte ion diffusion to active sites with lower resistance. Uniform nitrogen doping on RGO sheets with high nitrogen contents provides additional free electrons to the sheets, resulting in increased electronic conductivity. Cyanamide is used as the nitrogen doping source for the N-doped RGO as well as a nanospacer between the RGO sheets. In the composite, the nitrogen content of the RGO sheets is 2.3 wt%, which increases the electronic conductivity of the composite to 1.60 S cm−1. The specific surface area of the composite is increased to 35.8 m2 g−1. Thus, the composite structure with the N-doped RGO sheets and porous secondary particles has high electrical conductivity and high ion accessibility. The LTO/N-doped RGO composite demonstrates excellent electrochemical performance with a low resistance of 48.4 Ω, a high specific capacity of 117.8 mAh g−1 at 30 C, and good cycle stability.

Original languageEnglish
Pages (from-to)376-384
Number of pages9
JournalJournal of Power Sources
Volume336
DOIs
Publication statusPublished - 2016 Dec 30

Fingerprint

Cyanamide
cyanamides
Graphite
Oxides
Graphene
graphene
Nitrogen
Doping (additives)
nitrogen
composite materials
oxides
Composite materials
low resistance
Ions
porosity
conductivity
ions
composite structures
Pore structure
Composite structures

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Jeong, Jun Hui ; Kim, Myeong Seong ; Kim, Young Hwan ; Roh, Kwang Chul ; Kim, Kwang Bum. / High-rate Li4Ti5O12/N-doped reduced graphene oxide composite using cyanamide both as nanospacer and a nitrogen doping source. In: Journal of Power Sources. 2016 ; Vol. 336. pp. 376-384.
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abstract = "A Li4Ti5O12(LTO)/N-doped reduced graphene oxide (RGO) composite is proposed using dual functional nitrogen doping source to prevent RGO restacking and achieve uniform nitrogen doping on RGO sheets to increase the rate performance of high-rate lithium ion batteries. The pore structure (both meso- and macro pores) is developed when RGO restacking is prevented, facilitating electrolyte ion diffusion to active sites with lower resistance. Uniform nitrogen doping on RGO sheets with high nitrogen contents provides additional free electrons to the sheets, resulting in increased electronic conductivity. Cyanamide is used as the nitrogen doping source for the N-doped RGO as well as a nanospacer between the RGO sheets. In the composite, the nitrogen content of the RGO sheets is 2.3 wt{\%}, which increases the electronic conductivity of the composite to 1.60 S cm−1. The specific surface area of the composite is increased to 35.8 m2 g−1. Thus, the composite structure with the N-doped RGO sheets and porous secondary particles has high electrical conductivity and high ion accessibility. The LTO/N-doped RGO composite demonstrates excellent electrochemical performance with a low resistance of 48.4 Ω, a high specific capacity of 117.8 mAh g−1 at 30 C, and good cycle stability.",
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High-rate Li4Ti5O12/N-doped reduced graphene oxide composite using cyanamide both as nanospacer and a nitrogen doping source. / Jeong, Jun Hui; Kim, Myeong Seong; Kim, Young Hwan; Roh, Kwang Chul; Kim, Kwang Bum.

In: Journal of Power Sources, Vol. 336, 30.12.2016, p. 376-384.

Research output: Contribution to journalArticle

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AB - A Li4Ti5O12(LTO)/N-doped reduced graphene oxide (RGO) composite is proposed using dual functional nitrogen doping source to prevent RGO restacking and achieve uniform nitrogen doping on RGO sheets to increase the rate performance of high-rate lithium ion batteries. The pore structure (both meso- and macro pores) is developed when RGO restacking is prevented, facilitating electrolyte ion diffusion to active sites with lower resistance. Uniform nitrogen doping on RGO sheets with high nitrogen contents provides additional free electrons to the sheets, resulting in increased electronic conductivity. Cyanamide is used as the nitrogen doping source for the N-doped RGO as well as a nanospacer between the RGO sheets. In the composite, the nitrogen content of the RGO sheets is 2.3 wt%, which increases the electronic conductivity of the composite to 1.60 S cm−1. The specific surface area of the composite is increased to 35.8 m2 g−1. Thus, the composite structure with the N-doped RGO sheets and porous secondary particles has high electrical conductivity and high ion accessibility. The LTO/N-doped RGO composite demonstrates excellent electrochemical performance with a low resistance of 48.4 Ω, a high specific capacity of 117.8 mAh g−1 at 30 C, and good cycle stability.

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