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<p>In the field of lithium-ion battery anode binders, commercially available styrene–butadiene rubber (SBR) latex binders suffer from issues such as electrolyte swelling, poor interfacial compatibility, and insufficient mechanical properties. This study prepared a composite lithium battery binder (SBR-PA) with a solid content of 48% ± 2% by blending SBR and acrylic emulsion in an 8:2 mass ratio. FT-IR analysis confirmed successful introduction of carboxyl groups while preserving SBR’s original benzene rings and alkane structures. Thermal and mechanical tests demonstrated that SBR-PA exhibits excellent thermal stability and flexibility. Its elongation at break reached 440.90%, the elastic modulus was 5.00&#xa0;MPa, and the tensile strength was 5.93&#xa0;MPa, which were 486, 26, and 386% higher than those of commercial SBR, respectively, thereby effectively suppressing electrode swelling. Graphite electrodes using SBR-PA exhibit a peel strength of 16.8 N/m, exceeding commercially available SBR electrode sheets by over 30%. The electrolyte contact angle is 26°, demonstrating excellent interfacial wettability. Electrochemical testing revealed that SBR-PA-based electrodes maintained 81.5% capacity retention after 500 cycles, with a polarization potential difference of only 0.42&#xa0;V and stable interfacial impedance, significantly outperforming commercially available SBR binders. This blending strategy provides a viable pathway for industrial application of high-performance aqueous binders.</p>

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Preparation of styrene–butadiene rubber composite binder and its performance in graphite anodes for lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Na Luo,
  • PeiLan Wang,
  • ShanBing Zhou,
  • XueBu Hu,
  • YongWei Cai,
  • Lei Qiu

摘要

In the field of lithium-ion battery anode binders, commercially available styrene–butadiene rubber (SBR) latex binders suffer from issues such as electrolyte swelling, poor interfacial compatibility, and insufficient mechanical properties. This study prepared a composite lithium battery binder (SBR-PA) with a solid content of 48% ± 2% by blending SBR and acrylic emulsion in an 8:2 mass ratio. FT-IR analysis confirmed successful introduction of carboxyl groups while preserving SBR’s original benzene rings and alkane structures. Thermal and mechanical tests demonstrated that SBR-PA exhibits excellent thermal stability and flexibility. Its elongation at break reached 440.90%, the elastic modulus was 5.00 MPa, and the tensile strength was 5.93 MPa, which were 486, 26, and 386% higher than those of commercial SBR, respectively, thereby effectively suppressing electrode swelling. Graphite electrodes using SBR-PA exhibit a peel strength of 16.8 N/m, exceeding commercially available SBR electrode sheets by over 30%. The electrolyte contact angle is 26°, demonstrating excellent interfacial wettability. Electrochemical testing revealed that SBR-PA-based electrodes maintained 81.5% capacity retention after 500 cycles, with a polarization potential difference of only 0.42 V and stable interfacial impedance, significantly outperforming commercially available SBR binders. This blending strategy provides a viable pathway for industrial application of high-performance aqueous binders.