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Physically Cross-linked Polymer Binder Induced by Reversible Acid-Base Interaction for High-Performance Silicon
Sanghyun Lim, Hodong Chu, Kukjoo Lee
1Advanced Batteries Research Center, Korea Electronics Technology Institute , Bundang-gu, Seongnam, Gyeonggi-do 463-816, Korea.
ACS Applied Materials & Interfaces
|October 8, 2015
Summary
Researchers developed a novel polymer binder for silicon anodes in lithium-ion batteries. This binder uses reversible acid-base interactions to prevent electrode disintegration, enabling high capacity and long-lasting battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Silicon anodes offer high capacity for lithium-ion batteries (LIBs).
- Severe volume expansion of silicon during cycling causes electrode degradation.
- Existing chemical binders often fail due to irreversible network fracturing.
Purpose of the Study:
- To develop a novel binder system for high-performance silicon anodes.
- To address the challenge of volume changes in silicon electrodes.
- To improve the cyclability and stability of silicon-based LIBs.
Main Methods:
- Physically cross-linked polymer binder using reversible acid-base interactions.
- Utilized poly(acrylic acid) (PAA) and poly(benzimidazole) (PBI) components.
- Tested PAA-PBI binder performance in silicon anodes for LIBs.
Main Results:
- The PAA-PBI binder demonstrated reversible reconstruction of ionic bonds.
- Achieved a high capacity of 1376.7 mAh g⁻¹.
- Exhibited excellent cyclability with 751.0 mAh g⁻¹ after 100 cycles and 99.1% Coulombic efficiency.
Conclusions:
- Physically cross-linked binders offer a solution to silicon electrode pulverization.
- Reversible ionic bonds in the binder accommodate volume changes effectively.
- This approach advances the development of high-capacity lithium-ion batteries.
Keywords:
high capacity anodephysically cross-linked binderpoly(acrylic acid)poly(benzimidazole)reversible bindersiliconMore Related Videos
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