氟代酰胺FDMA改性聚合物电解质提升钠离子电池正极界面稳定性

孙德兴; 黄小荣; 刘泽槐; 秦啸天

doi:10.19799/j.cnki.2095-4239.2026.0557

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氟代酰胺FDMA改性聚合物电解质提升钠离子电池正极界面稳定性

储能材料与器件 | 更新时间：2026-10-22

- 氟代酰胺FDMA改性聚合物电解质提升钠离子电池正极界面稳定性
- Enhancing cathode interface stability in sodium-ion batteries via fluorinated amide fdma-modified polymer electrolyte
- 储能科学与技术 2026年15卷第10期页码：3860-3870
- 作者机构：
  
  1.广东电网有限责任公司东莞供电局，广东东莞 523000
  2.广东新型储能国家研究院有限公司，广东广州 510000
- 作者简介：
  
  孙德兴（1981—），男，本科，高级工程师，研究方向为高电压技术，E-mail：sundexing@139.com；
  黄小荣，高级工程师，研究方向为储能与低压直流，E-mail：706360854@qq.com
  秦啸天，助理研究员，研究方向为电池储能系统安全防控与集成控制，E-mail： qinxiaotian@naesic.com。
- 基金信息：
  
  南方电网科技项目［031900KC24040028(GDKJXM20240438)
- DOI：10.19799/j.cnki.2095-4239.2026.0557
  中图分类号： TM 912;TB 3
- 收稿：2026-06-27，
  
  修回：2026-07-22，
  
  纸质出版：2026-10-28
- 稿件说明：
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孙德兴, 黄小荣, 刘泽槐, 等. 氟代酰胺FDMA改性聚合物电解质提升钠离子电池正极界面稳定性[J]. 储能科学与技术, 2026, 15(10): 3860-3870.

SUN Dexing, HUANG Xiaorong, LIU Zehuai, et al. Enhancing cathode interface stability in sodium-ion batteries via fluorinated amide fdma-modified polymer electrolyte[J]. Energy Storage Science and Technology, 2026, 15(10): 3860-3870.
孙德兴, 黄小荣, 刘泽槐, 等. 氟代酰胺FDMA改性聚合物电解质提升钠离子电池正极界面稳定性[J]. 储能科学与技术, 2026, 15(10): 3860-3870. DOI： 10.19799/j.cnki.2095-4239.2026.0557.

SUN Dexing, HUANG Xiaorong, LIU Zehuai, et al. Enhancing cathode interface stability in sodium-ion batteries via fluorinated amide fdma-modified polymer electrolyte[J]. Energy Storage Science and Technology, 2026, 15(10): 3860-3870. DOI： 10.19799/j.cnki.2095-4239.2026.0557.

摘要

聚合物固态电解质兼具安全性与良好机械柔性，是发展高安全钠离子电池的重要材料。然而，传统聚偏氟乙烯（PVDF）基聚合物电解质仍存在室温离子电导率偏低、与层状氧化物正极界面电化学稳定性不足等问题，限制了其在长寿命钠离子电池中的应用。针对上述问题，本工作将2

2-三氟-

-二甲基乙酰胺（FDMA）作为功能性添加剂引入PVDF-双三氟甲基磺酰亚胺钠（NaTFSI）电解质中，构建兼具较高离子传输能力和正极界面稳定性的复合聚合物电解质。结果表明，FDMA中的羰基氧可与Na

发生配位作用，削弱Na

与TFSI

之间的相互作用，促进NaTFSI解离，使电解质的室温离子电导率达到2.62 mS/cm。密度泛函理论计算表明，FDMA具有较低的最高占据分子轨道能级，有利于提高电解质的氧化稳定性。将PVDF-NaTFSI-FDMA电解质匹配O3型钠离子正极材料并组装全电池后，FDMA通过调控正极-电解质界面化学反应，促进形成富NaF的正极电解质界面（CEI）层，抑制正极与电解质的持续副反应，减缓正极结构退化。采用该电解质组装的NaCu

0.12

0.22

0.33

||Na电池在2.0～4.0 V电压和1 C倍率下循环600次后，容量保持率为85.5%。本研

究表明，FDMA可实现PVDF基聚合物电解质的离子传输行为和正极-电解质界面稳定性调控，为构建高安全性、长循环寿命的钠离子聚合物固态电池提供了实验依据。

Abstract

Polymer electrolytes are inherent safe and mechanically flexible

making them promising candidates for high-safety sodium-ion batteries. However

conventional poly(vinylidene fluoride) (PVDF)-based polymer electrolytes typically exhibit low room-temperature ionic conductivity and insufficient electrochemical stability at interfaces with layered oxide cathodes

limiting their application in long-life sodium-ion batteries. To address these issues

2-trifluoro-

-dimethylacetamide (FDMA) was introduced as a functional additive into a PVDF-NaTFSI electrolyte

yielding a composite polymer electrolyte with enhanced ionic conductivity and interfacial stability. The carbonyl oxygen in FDMA coordinates with Na

thereby weakening the interaction between Na

and TFSI and promoting NaTFSI dissociation. Consequently

the composite electrolyte achieves a room-temperature ionic conductivity of 2.62 mS/cm. Density functional theory calculations reveal that FDMA has a low highest occupied molecular orbital energy level

which contributes to the improved oxidative stability of the composite electrolyte. When coupled with O3-type sodium-ion cathode materials in full cells

the PVDF-NaTFSI-FDMA electrolyte enables FDMA-mediated regulation of cathode/electrolyte interfacial chemistry

promoting the formation of a NaF-rich CEI layer. This robust interphase effectively suppresses continuous parasitic reactions between the cathode and electrolyte

thereby mitigating structural degradation of the cathode during cycling. The NaCu

0.12

0.22

0.33

||Na cell using the FDMA-modified electrolyte retains 85.5% of its capacity after 600 cycles at 1 C within a voltage range of 2.0—4.0 V. These results demonstrate that FDMA can simultaneously improve ion transport in PVDF-based

polymer electrolytes and stabilize the cathode-electrolyte interface

providing an experimental basis for developing safe and long-life sodium-ion batteries based on solid polymer electrolytes.

关键词

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