Highly conductive carbon nanotube micro-spherical network for high-rate silicon anode

Byung Hoon Park, Jun Hui Jeong, Geon Woo Lee, Young Hwan Kim, Kwang Chul Roh, Kwang Bum Kim

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We report on a highly conductive CNT micro-spherical network for high-rate silicon anode materials prepared by one-pot spray drying for lithium-ion batteries. The anode material contains silicon nanoparticles bound to CNTs through a small amount of sucrose-derived carbon. The first charge and discharge capacities of the Si/CNT/C microsphere electrode are measured to be 3152 and 2302 mA h g−1 of the composite, respectively, at 0.1 A g−1. The Si/CNT/C microsphere electrode exhibits an initial capacity of 1989 mA h g−1 at current density of 1.0 A g−1 and retains ∼70% of the initial capacity after 100 cycles. Even at a high current density of 10 A g−1, the Si/CNT/C microsphere electrode exhibits a capacity of 784 mA h g−1 with a stable charge/discharge behavior. The superior rate capability of the Si/CNT/C microsphere composites can be attributable to the unhindered Li-ion transport through the highly conductive CNT buffer matrix, to which Si NPs are strongly bound by the sucrose-derived carbon. These salient results give further impetus to the study of CNTs for use as a buffer matrix to improve the rate capability of high-capacity electrode materials with large volume changes during charge storage.

Original languageEnglish
Pages (from-to)94-101
Number of pages8
JournalJournal of Power Sources
Volume394
DOIs
Publication statusPublished - 2018 Aug 1

Bibliographical note

Funding Information:
This research was supported by a grant from the Technology Development Program for Strategic Core Materials funded by the Ministry of Trade, Industry & Energy, Republic of Korea (Project No. 10047758 ). This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) ( NRF-2011-0030542 ). This work was supported by the Industry Technology Development Program ( 10080540 , Development of film-type flexible supercapacitors with microstructured electrodes based on nanomaterials) funded by the Ministry of Trade, Industry&Energy (MOTIE, Korea).

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

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