High-performance silicon diphosphide/nanocarbon composite anode for Li-ion batteries: Role of chemical bonding and interfaces in the establishment of cycling stability

Byung Hoon Park, Safa Haghighat-Shishavan, Masoud Nazarian-Samani, Kwang Bum Kim

Research output: Contribution to journalArticle

Abstract

Silicon diphosphide (SiP2), a next-generation anode material for lithium ion batteries, exhibits a high theoretical specific capacity (2900 mAh g−1), however, its capacity is rapidly faded due to its large volume change. An effective way to improve the electrochemical performances of SiP2 is to composite with carbon buffer. In the composite, chemical bonds of SiP2 and carbon are expected to maintain SiP2 to carbon connections during cycling, thereby, provide electron conduction pathways even under the volume change of SiP2. However, effect of the chemical bonds is not clearly understood. Thus, it is very important to distinguish contributions of the carbon buffer and chemical bonds to the electrochemical properties of SiP2. Herein, SiP2 composites with nanocarbon are prepared with and without chemical bonds between SiP2 and carbon by controlling ball milling parameter with an aim to investigate respective contribution of the carbon buffer and chemical bonds to the electrochemical properties of SiP2. The SiP2/nanocarbon composite with P–O–C and Si–O–C chemical bonds shows great improvement of electrode performances over the composite without the chemical bonds. Furthermore, the SiP2–nanocarbon interface is found to facilitate fast ion conduction, overcoming the issues associated with the ionically insulative LiP.

Original languageEnglish
Article number226759
JournalJournal of Power Sources
Volume434
DOIs
Publication statusPublished - 2019 Sep 15

Fingerprint

Chemical bonds
Silicon
chemical bonds
electric batteries
Anodes
anodes
Carbon
cycles
composite materials
Composite materials
silicon
carbon
ions
Buffers
buffers
Electrochemical properties
Ball milling
Lithium-ion batteries
conduction electrons
balls

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

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title = "High-performance silicon diphosphide/nanocarbon composite anode for Li-ion batteries: Role of chemical bonding and interfaces in the establishment of cycling stability",
abstract = "Silicon diphosphide (SiP2), a next-generation anode material for lithium ion batteries, exhibits a high theoretical specific capacity (2900 mAh g−1), however, its capacity is rapidly faded due to its large volume change. An effective way to improve the electrochemical performances of SiP2 is to composite with carbon buffer. In the composite, chemical bonds of SiP2 and carbon are expected to maintain SiP2 to carbon connections during cycling, thereby, provide electron conduction pathways even under the volume change of SiP2. However, effect of the chemical bonds is not clearly understood. Thus, it is very important to distinguish contributions of the carbon buffer and chemical bonds to the electrochemical properties of SiP2. Herein, SiP2 composites with nanocarbon are prepared with and without chemical bonds between SiP2 and carbon by controlling ball milling parameter with an aim to investigate respective contribution of the carbon buffer and chemical bonds to the electrochemical properties of SiP2. The SiP2/nanocarbon composite with P–O–C and Si–O–C chemical bonds shows great improvement of electrode performances over the composite without the chemical bonds. Furthermore, the SiP2–nanocarbon interface is found to facilitate fast ion conduction, overcoming the issues associated with the ionically insulative LiP.",
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High-performance silicon diphosphide/nanocarbon composite anode for Li-ion batteries : Role of chemical bonding and interfaces in the establishment of cycling stability. / Park, Byung Hoon; Haghighat-Shishavan, Safa; Nazarian-Samani, Masoud; Kim, Kwang Bum.

In: Journal of Power Sources, Vol. 434, 226759, 15.09.2019.

Research output: Contribution to journalArticle

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AU - Nazarian-Samani, Masoud

AU - Kim, Kwang Bum

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