Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Partially Carbonized Poly (Acrylic Acid) Grafted to Carboxymethyl Cellulose as an Advanced Binder for Si Anode in Li-ion Batteries

  • Cho, Hyunwoo (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Kim, Kyungsu (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Park, Cheol-Min (School of Materials Science and Engineering, Kumoh National Institute of Technology) ;
  • Jeong, Goojin (Advanced Batteries Research Center, Korea Electronics Technology Institute)
  • Received : 2018.10.18
  • Accepted : 2018.10.25
  • Published : 2019.06.30
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Abstract

To improve the performance of Si anodes in advanced Li-ion batteries, the design of the electrode plays a critical role, especially due to the large volumetric expansion in the Si anode during Li insertion. In our study, we used a simple fabrication method to prepare Si-based electrodes by grafting polyacrylic acid (PAA) to a carboxymethyl cellulose (CMC) binder (CMC-g-PAA). The procedure consists of first mixing nano-sized Si and the binders (CMC and PAA), and then coating the slurry on a Cu foil. The carbon network was formed via carbonization of the binders i.e., by a simple heat treatment of the electrode. The carbon network in the electrode is mechanically and electrically robust, which leads to higher electrical conductivity and better mechanical property. This explains its long cycle performance without the addition of a conducting agent (for example, carbon). Therefore, the partially carbonized CMC-g-PAA binder presented in this study represents a new feasible approach to produce Si anodes for use in advanced Li-ion batteries.

Keywords

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Fig. 1. a) TGA analysis of the P10 electrode before heat treatment, Schematic diagram of b) grafting of PAA to CMC and c) electrode preparation.

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Fig. 2. a) FT-IR spectra of electrodes, b) Raman analysis of electrodes, c) electrode image after adhesion test and d) SBRCMC binder electrode image after adhesion test.

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Fig. 3. a) Considered models of CMC-g-PAA and b) FT-IR spectroscopy data derived from DFT calculations for each model

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Fig. 4. a) Cycle data, b) rate profile of the P10 electrode, c) rate profile of the R3 electrode and d) Nyquist plot of P10 and R3.

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Fig. 5. a), b) Cross-sectional image and c) carbon mapping of the P10 electrode before cycle test; d) cross-sectional image, e) surface image, and f) carbon mapping of the P10 electrode after 1000 cycles at 3000 mA g-1.

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Fig. 6. a) Cross-sectional image and element mapping for C; element mapping for b) F, c) P, d) Si of the P10 electrode after 1000 cycles at 3000 mA g-1 and e) cycle data.

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Fig. 7. a) Cycle data and b) voltage profiles for different binder ratios in the P10 electrode.

Table 1. Calculated thermodynamic data for model 1 and model 2.

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Table 2. Electrical conductivity for different binder ratios measured by a four-point probe.

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