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武汉大学「国家高层次人才」曹余良/方永进Angew | 低成本、高稳定性NaNO₃基磷酸盐电解质!

  • 2026-02-05 05:16:57
武汉大学「国家高层次人才」曹余良/方永进Angew | 低成本、高稳定性NaNO₃基磷酸盐电解质!
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为实现低成本、可持续的钠离子电池,需设计创新的电解质体系以克服传统钠盐(如NaPF₆、NaFSI)合成复杂、空气稳定性差、成本高等缺点。无机钠盐如NaNO₃因其成本低、空气稳定、热稳定性好而成为有前景的替代品,但其在非水溶剂中溶解度低、还原稳定性差,限制了实际应用。

在此,武汉大学曹余良,方永进等人提出了一种新型电解质体系,以NaNO₃为唯一钠盐,溶解于磷酸三甲酯(TMP)与三(2,2,2-三氟乙基)磷酸酯(TFEP)的双溶剂体系中。TMP凭借其高古特曼供体数和介电常数实现了NaNO₃的高溶解度,而TFEP则调节离子-溶剂配位结构,增强还原稳定性,并在硬碳负极表面促进形成富NaF/NaN₂O₇的分层无机SEI膜。

得益于溶剂化结构还原稳定性的提升和坚固的SEI膜,硬碳负极实现了78.6%的初始库仑效率和99.4%的200次循环后容量保持率,而Na₄Fe₃(PO₄)₂(P₂O₇)(NFPP)正极在400次循环后仍保持87.5%的容量。此外,硬碳//NFPP软包电池验证了该体系的可行性,即使在点燃条件下仍能正常放电。本研究为设计低成本、高安全的钠离子电池电解质提供了战略性蓝图,突显了NaNO₃在实现可持续储能解决方案中的潜力。

图1. 电解液配置

总之,该工作开发了一种用于钠离子电池的新型电解质设计,以无机NaNO₃为唯一钠盐,搭配磷酸三甲酯(TMP)和三(2,2,2-三氟乙基)磷酸酯(TFEP)的双溶剂体系。

TMP凭借其强供电子能力实现了NaNO₃的高溶解度,而TFEP则发挥双重作用:通过增强Na⁺–NO₃⁻相互作用,形成阴离子诱导的溶剂化结构(AI-ISC),提升LUMO能级以改善还原稳定性;同时在硬碳负极表面构筑富NaN₂O₇表层和整体富NaF的分层无机SEI膜,有效抑制持续电解质分解。

该设计的协同效应使硬碳负极实现了78.6%的高初始库仑效率和99.4%的200次循环后容量保持率。此外,该电解质还展现出广泛的兼容性,提升了Na₄Fe₃(PO₄)₂(P₂O₇)和Na₃V₂(PO₄)₃等正极的循环稳定性和倍率性能。全电池测试进一步验证了该电解质的实用性,展示了其在极端条件下的稳定运行和本征不易燃性。本工作开创了一种使用低成本无机钠盐的经济且安全的电解质策略,推动了钠离子电池朝着可规模化、可持续储能方向发展。

图2. 电池性能

Low-Cost NaNO3-Based Phosphate Electrolytes with Exceptional Stability Toward Sustainable and High-Safety Sodium-Ion Batteries, Angewandte Chemie International Edition 2025 DOI: 10.1002/anie.202519208

曹余良 武汉大学化学与分子科学学院教授,博士生导师;近年来在Nature子刊Nat. Energy, Nat. Nanotech.、Energy Environ. Sci.、Chem, Adv. Mater.、Nano. Lett.等国际学术期刊上发表SCI论文300余篇,他引20000余次,h指数为80,ESI高被引论文23篇,其中5篇进入ESI热点论文,连续五年入选科睿唯安(Clarivate Analytics)年度“高被引科学家”。

方永进,武汉大学化学与分子科学学院 教授,博士生导师,入选国家级青年人才项目、湖北省楚天学者计划。主要研究方向为锂/钠离子电池电极材料和电解液等。近年来在Sci. Adv.、J. Am. Chem. Soc.、Angew. Chem. Int. Ed.、Chem、Adv. Mater.、Adv. Energy. Mater.、Energy Environ. Sci.、ACS Energy Lett.、Matter、CCS Chem.、Nano Lett.、Adv. Sci.、Carbon Energy等国际学术期刊上发表SCI论文90余篇,引用12000余次,h指数为52。

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  1. CONNECT:[ UseTime:0.000925s ] mysql:host=127.0.0.1;port=3306;dbname=g_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000888s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000632s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000605s ]
  8. SELECT * FROM `article` WHERE `id` = 463003 LIMIT 1 [ RunTime:0.001407s ]
  9. UPDATE `article` SET `lasttime` = 1770467869 WHERE `id` = 463003 [ RunTime:0.016087s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000997s ]
  11. SELECT * FROM `article` WHERE `id` < 463003 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001096s ]
  12. SELECT * FROM `article` WHERE `id` > 463003 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001997s ]
  13. SELECT * FROM `article` WHERE `id` < 463003 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016206s ]
  14. SELECT * FROM `article` WHERE `id` < 463003 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012463s ]
  15. SELECT * FROM `article` WHERE `id` < 463003 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004190s ]
0.221752s