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『钠电』南京大学 JACS:有序 - 无序离子共晶固态电解质,实现超快 Na⁺迁移与长循环稳定

  • 2026-05-26 16:40:07
『钠电』南京大学 JACS:有序 - 无序离子共晶固态电解质,实现超快 Na⁺迁移与长循环稳定
【背景挑战】
固态钠金属电池兼具钠资源丰富与高安全优势,但固态电解质发展面临三大固有瓶颈:1)无机固态电解质晶界阻抗高、刚性大,需外压才能维持界面接触,加工性差;2)聚合物电解质室温 Na⁺电导率极低(<10⁻⁴ S cm⁻¹),Na⁺迁移数低、浓差极化严重;3)复合电解质高填料易脆化、界面接触差,难以兼顾高电导、高稳定与优异界面相容性。同步实现室温高 Na⁺电导、高迁移数、宽电化学窗口、自修复界面、无枝晶,是固态钠金属电池实用化核心难题。
【文献导入】
本研究首次构建有序 - 无序杂化离子共晶固态电解质NaClO₄(SN)₃:有序部分:NaClO 2/3 SN 形成 Na⁺配位骨架,ClO₄⁻被固定,实现单离子传导;无序部分:间隙中 SN 分子取向无序,构筑辅助离子快速迁移通道;熔点 36.2℃,可原位熔融浸润电极,固化后形成无缝低阻抗界面;构建 3D 连续 Na⁺快速跃迁网络,活化能低至 0.26 eV,室温电导率达 0.94 mS cm⁻¹Na||Na 对称电池 1 mA cm⁻²/2 mAh cm⁻² 稳定循环 1300 h,过电位仅 35 mVNa₂Fe₂(SO₄)₃||Na 全电池 0.5 C 循环 1500 圈容量保持 84.9%
【创新点】
结构原创:首次提出有序 - 无序杂化离子共晶设计,有序骨架 + 无序通道双重协同;
机制突破:揭示固定阴离子单离子传导 + 无序区辅助跃迁一体化超快 Na⁺传输新机制;
性能突破:室温 0.94 mS cm⁻¹ 高电导、0.94  Na⁺迁移数、4.6 V 宽窗口、1300 h 超长对称电池;
工艺突破:低温熔融原位浸润,无需高压,适配大规模工业化组装。
【图文详解】
 1 有序 - 无序共晶电解质结构设计与表征
 1 NaClO₄(SN)₃共晶结构与组成。(a) 不同比例共晶实物图;(b) XRD 精修;(c) 单晶 ORTEP 图;(d–f) NaClO₄(SN)₁/₂/₃晶体结构;(g) 静电势分布;(h) HOMO-LUMO 能级。
1Na⁺为八面体配位, O 来自ClO₄⁻ N 来自 SN,形成刚性有序骨架;
2)多余 SN 分子处于间隙,呈取向无序,构成柔性离子通路;
3HOMO 能级显著降低,氧化稳定性提升,电化学窗口>4.6 V
 2 超快 Na⁺传输机制与理论计算
 2 离子传输路径与能垒。(a,b) MD 模拟结构演化;(c) RDF 与配位数;(d) AIMD Na⁺扩散等值面;(e) 四条传输路径;(f) 对应扩散能垒;(g) Na⁺脱配位能垒。
1)有序骨架提供顶点 - 顶点低能垒主通道2.55 eV);
2无序区提供辅助旁路,降低整体跃迁能垒;
3)纯有序环境传输成本高,无序引入显著提升传导效率。
 3 共晶物化性质与电化学基础性能
 3 结构与基础性能表征。(a)²³Na NMR(b) FTIR(c) DSC 熔点与Tg(d) LSV 稳定窗口;(e) Arrhenius 活化能;(f) 室温电导率与迁移数;(g) 原位熔融浸润示意图。
1)熔点 36.2℃,玻璃化转变−37.9℃,室温为固态、低温可熔融加工;
2)活化能 0.26 eV,室温电导率 0.94 mS cm⁻¹Na⁺迁移数 0.94
3)原位熔融浸润形成共形界面,大幅降低界面阻抗。
 4 钠负极稳定性与 SEI 结构剖析
 4 对称电池与负极界面。(a) 临界电流密度;(b) 1300 h 长循环;(c) 阻抗对比;(d–g) Cl 2p/O 1s/C 1s/N 1s XPS(h) SEI 元素比例。
1)临界电流密度高达 10.0 mA cm⁻²,无枝刺穿;
21300 h 循环过电位平稳仅 35 mV,界面阻抗低至 220.78 Ωcm²
3SEI 富含 C/O/Na 有机 - 无机复合组分,离子导电、电子绝缘,稳定均匀。
 5 高电压全电池超长循环性能
 5 Na₂Fe₂(SO₄)₃||Na 全电池性能。(a) 阻抗对比;(b) 倍率性能;(c) 充放电曲线;(d) 0.2 C 循环 300 圈;(e) 曲线叠加;(f) 中值电压演化;(g) 0.5 C 循环 1500 圈;(h) 曲线对比。
10.1–1.0 C 宽倍率稳定,容量保持优异、极化极低;
20.2 C 循环 300 圈保持 89.6%,中值电压>3.53 V
30.5 C 超大电流 1500 圈保持 84.9%,每圈衰减仅 0.0101%
【结论总结】
本研究开创有序 - 无序杂化离子共晶固态电解质全新范式,一次性破解固态钠电池三大痛点:1)有序骨架固定阴离子:实现高迁移数单离子传导,抑制浓差极化;2无序区构筑超快通道:协同降低 Na⁺跃迁能垒,实现室温高电导;3)低温熔融原位浸润:形成无缝界面,无需外压、抑制枝晶、提升稳定性;4)综合性能极致:高电导、高迁移数、宽窗口、长循环、易加工,全面领先传统体系。该工作建立有序骨架无序通道单离子快速传输一体化固态电解质设计新准则,为高安全、长寿命、易加工固态钠金属电池提供革命性解决方案。
【文献速递】
Ordered−Disordered Ionic Cocrystalline Solid-State Electrolytes for Rapid Ion Migration in Sodium Metal Batteries.Journal of the American Chemical Society, 2026; https://doi.org/10.1021/jacs.6c01095
本文内容来源于学术研究论文,版权归原作者所有。转载旨在分享学术成果,仅供参考,不构成任何应用建议。如涉及作品内容、版权或其他问题,请及时联系处理。

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  1. CONNECT:[ UseTime:0.000699s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001014s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004301s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000409s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000817s ]
  6. SELECT * FROM `set` [ RunTime:0.000357s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000927s ]
  8. SELECT * FROM `article` WHERE `id` = 570969 LIMIT 1 [ RunTime:0.001737s ]
  9. UPDATE `article` SET `lasttime` = 1780284015 WHERE `id` = 570969 [ RunTime:0.000884s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000368s ]
  11. SELECT * FROM `article` WHERE `id` < 570969 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000605s ]
  12. SELECT * FROM `article` WHERE `id` > 570969 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000934s ]
  13. SELECT * FROM `article` WHERE `id` < 570969 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001944s ]
  14. SELECT * FROM `article` WHERE `id` < 570969 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001578s ]
  15. SELECT * FROM `article` WHERE `id` < 570969 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004706s ]
0.125890s