通过先进粘合剂释放锂离子电池的潜力

Lithium-ion batteries are widely used in various applications but need improved binders to enhance their performance to meet evolving demands. This is because silicon oxide (SiO), a promising anode material due to its high capacity and low cost, faces several challenges. These include poor conductivity, which leads to slower charging rates, and significant expansion during charging. Effective binders are thus essential to address these issues and ensure enhanced performance and prolonged durability for lithium-ion battery systems.
锂离子电池广泛应用于各种场景，但需要改进粘合剂以提升性能，从而满足不断变化的需求。这是因为作为负极材料的氧化硅（SiO）虽然因其高容量和低成本颇具潜力，但仍面临多项挑战，包括导电性差导致充电速率较慢，以及充电过程中显著的体积膨胀。因此，有效的粘合剂对解决这些问题至关重要，可确保锂离子电池系统实现更强的性能与更持久的耐用性。

In a recent study published in the journal ACS Applied Energy Materials on February 8, 2024, Professor Noriyoshi Matsumi from the Japan Advanced Institute of Science and Technology (JAIST), along with doctoral student Noriyuki Takamori, former Senior Lecturer Rajashekar Badam, Dr. Tejkiran Pindi Jayakumar (former student), and researchers from Maruzen Petrochemical Company Ltd., have utilized poly(vinylphosphonic acid) (PVPA) as a binder for a micro-SiO electrodes, achieving superior performance compared to conventional cells.
日本科学技术高等研究院（JAIST）的松见纪良教授与博士生高森纪之、前高级讲师Rajashekar Badam、前学生Tejkiran Pindi Jayakumar博士及Maruzen Petrochemical Company Ltd.的研究人员合作，在2024年2月8日发表于《ACS Applied Energy Materials》的研究中，采用聚（乙烯基膦酸）（PVPA）作为微米SiO电极的黏结剂，其性能表现优于传统电池。

According to Prof. Matsumi, "The PVPA binder should prove to be very useful in extending the life of high-performing lithium-ion secondary batteries. Particularly in the application of electric vehicles, there has been intense interest in enabling long life for lithium-ion secondary batteries. The use of PVPA will offer improved alternatives to commercially available binders, such as poly(acrylic acid) (PAA) and poly(vinylidene fluoride) (PVDF), etc."
据Matsumi教授所述，“PVPA粘合剂应能有效延长高性能锂离子二次电池的寿命。尤其在电动汽车应用领域，业界对实现锂离子二次电池长寿命一直抱有浓厚兴趣。PVPA的应用将为聚丙烯酸（PAA）、聚偏氟乙烯（PVDF）等商用粘合剂提供更优替代方案。”

The study involved fabricating electrodes containing PVPA, PAA, and PVDF as binders, and their performance was assessed through electrochemical experiments and density functional theory. PVPA demonstrated notably stronger adhesion (3.44 N/m) to a copper support compared to conventional PAA (2.03 N/m), leading to significantly enhanced durability in lithium-ion batteries.
该研究涉及制造含有PVPA、PAA和PVDF作为粘合剂的电极，并通过电化学实验和密度泛函理论评估其性能。与传统PAA（2.03 N/m）相比，PVPA对铜基底的粘附力（3.44 N/m）显著更强，从而显著提升了锂离子电池的耐久性。

The PVPA-based cell also delivered almost twice the discharging capacity compared to the PAA-based cell after 200 cycles, with the PVPA-based half-cell achieving 1300 mAhg^-1SiO after the same cycle count. Even after 200 cycles of charge-discharge, exfoliation from the current collector was not observed in scanning electron microscopy, unlike with PVDF or PAA binders. Furthermore, the stronger adhesion of PVPA helps stabilize the SiO-based anode, preventing its exfoliation even with significant volume expansion.
基于PVPA的电池在200次循环后还提供了几乎两倍于基于PAA电池的放电容量，PVPA半电池在相同循环次数后实现了1300 mAhg SiO的容量。即使在200次充放电循环后，扫描电子显微镜也未观察到从集流体上剥离的现象，这与PVDF或PAA粘合剂不同。此外，PVPA更强的粘附力有助于稳定SiO基阳极，即使在大幅体积扩展包的情况下也能防止其剥离。

Additionally, Maruzen Petrochemical Company Ltd., whose researchers were part of the study, has established an industrial production process for PVPA. Continuous collaboration between JAIST and Maruzen Petrochemical Company Ltd., along with the inclusion of additional battery production expertise from the company, may further accelerate the process toward real-life applications. Patents for this technology have been submitted both domestically (Japan) and internationally as a joint application by JAIST and Maruzen Petrochemical Company Ltd.
此外，参与该研究的丸善石化株式会社（Maruzen Petrochemical Company Ltd.）已建立了PVPA的工业化生产工艺。北陆先端科学技术大学院大学（JAIST）与丸善石化株式会社的持续合作，加上该公司引入的额外电池生产专业知识，可能会进一步加速该技术的实际应用进程。该技术的专利已由JAIST与丸善石化株式会社联合提交，涵盖日本国内及国际申请。

"An industrially feasible, high-performing binder like this will aid in the development of technology for highly durable and high-energy-density batteries. This will result in the wider adoption of EVs worldwide without concerns about performance degradation over a longer period. These materials can also be applicable to a variety of electric vehicles such as trains, ships, aircraft, etc., in the future," envisions Prof. Matsumi.
松见教授展望道："这样一种工业上可行的高性能配对材料将有助于开发高度耐用和高能量密度电池的技术。这将使电动汽车在全球范围内更广泛地采用，而无需担心长期性能退化。未来这些材料还可应用于火车、配对、飞机等多种电动交通工具。"

In summary, scientists have developed a functional binder using poly(vinylphosphonic acid) for SiO-based anodes in lithium-ion batteries. This low-cost binder enhances performance compared to conventional options and represents a novel advancement for micro-SiO-based applications in electric vehicles and beyond!
总之，科学家们利用poly(vinylphosphonic acid)为锂离子电池的SiO基负极开发了一种功能性配对剂。与传统选项相比，这种低成本配对剂能提升性能，并代表了微SiO基应用在电动汽车等领域的新颖进步！