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Issue 30, 2018, Issue in Progress
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Performance optimization of freestanding MWCNT-LiFePO4 sheets as cathodes for improved specific capacity of lithium-ion batteries

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Abstract

The typical lithium-ion-battery positive electrode of “lithium-iron phosphate (LiFePO4) on aluminum foil” contains a relatively large amount of inactive materials of 29 wt% (22 wt% aluminum foil + 7 wt% polymeric binder and graphitic conductor) which limits its maximum specific capacity to 120.7 mA h g−1 (71 wt% LiFePO4) instead of 170 mA h g−1 (100 wt% LiFePO4). We replaced the aluminum current-collector with a multi-walled carbon nanotube (MWCNT) network. We optimized the specific capacity of the “freestanding MWCNT-LiFePO4” positive electrode. Through the optimization of our unique surface-engineered tape-cast fabrication method, we demonstrated the amount of LiFePO4 active materials can be as high as 90 wt% with a small amount of inactive material of 10 wt% MWCNTs. This translated to a maximum specific capacity of 153 mA h g−1 instead of 120.7 mA h g−1, which is a significant 26.7% gain in specific capacity compared to conventional cathode design. Experimental data of the freestanding MWCNT-LiFePO4 at a low discharge rate of 17 mA g−1 show an excellent specific capacity of 144.9 mA h g−1 which is close to its maximum specific capacity of 153 mA h g−1. Furthermore, the freestanding MWCNT-LiFePO4 has an excellent specific capacity of 126.7 mA h g−1 after 100 cycles at a relatively high discharge rate of 170 mA g−1 rate.

Graphical abstract: Performance optimization of freestanding MWCNT-LiFePO4 sheets as cathodes for improved specific capacity of lithium-ion batteries

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Publication details

The article was received on 15 Feb 2018, accepted on 26 Apr 2018 and first published on 04 May 2018


Article type: Paper
DOI: 10.1039/C8RA01461B
Citation: RSC Adv., 2018,8, 16566-16573
  • Open access: Creative Commons BY-NC license
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    Performance optimization of freestanding MWCNT-LiFePO4 sheets as cathodes for improved specific capacity of lithium-ion batteries

    R. A. Susantyoko, T. S. Alkindi, A. B. Kanagaraj, B. An, H. Alshibli, D. Choi, S. AlDahmani, H. Fadaq and S. Almheiri, RSC Adv., 2018, 8, 16566
    DOI: 10.1039/C8RA01461B

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