当前位置:首页>深圳>深圳大学崔焕卿/姚磊联合新加坡国立大学杨慧颖团队Nano Energy:弱溶剂化局域水盐电解液协同水合离子筛分碳孔,助力超低温锌离子混合电容

深圳大学崔焕卿/姚磊联合新加坡国立大学杨慧颖团队Nano Energy:弱溶剂化局域水盐电解液协同水合离子筛分碳孔,助力超低温锌离子混合电容

  • 2026-05-23 12:00:45
深圳大学崔焕卿/姚磊联合新加坡国立大学杨慧颖团队Nano Energy:弱溶剂化局域水盐电解液协同水合离子筛分碳孔,助力超低温锌离子混合电容

第一作者:Yingmeng Zhang

通讯作者:Huanqing Cui,Hui Ying Yang,Lei Yao

通讯单位:Shenzhen University;National University of Singapore

论文 DOI:https://doi.org/10.1016/j.nanoen.2026.111720

研究背景
水系锌离子混合电容器(AZHCs)兼具电池型能量密度与超级电容器型功率特征,是极具潜力的低成本安全储能体系。但当工作温度降至 -40 ℃以下时,电解液易发生冻结,Zn2+ 在体相中的扩散以及电极界面的去溶剂化过程都会显著变慢,进而拖累倍率性能、能量密度和循环稳定性。近年来,water-in-salt(WIS)与 localized water-in-salt(LWIS)策略虽能一定程度降低冰点并拓宽电化学窗口,但高盐体系仍普遍存在黏度偏高、Zn2+ 去溶剂化困难、副反应增强及枝晶生长等问题。也就是说,如何同时降低自由水活性、优化 Zn2+ 溶剂化结构并稳定电极/电解液界面,仍是超低温 AZHCs 设计的关键挑战。
内容简介
针对这一难题,作者提出弱溶剂化局域水盐(ws-LWIS)电解液策略:在 Zn(ClO4)2 水系高盐体系中引入乙腈(AN),使电解液同时具备 LWIS 的局域高浓度特征和弱溶剂化特征。分子动力学与 DFT 计算表明,Zn2+ 的溶剂化结构由传统的 Zn[H2O]6^2+ 转变为 Zn[H2O]5[ClO]+,从而显著削弱 Zn2+-H2O 相互作用并降低界面去溶剂化难度。
进一步地,团队构筑了分级多孔碳纳米笼(HPC-NC)正极,以匹配优化后的水合离子尺寸与传输行为。最终,Zn||HPC-NC 全电池在 -50 ℃、1.0 A g^-1 下可实现 165.1 mAh g^-1 的比容量,在 10 A g^-1 下循环 3000 次后仍保持 88.2% 初始容量;同时器件在 -50 ℃下实现 143.3 Wh kg^-1 的能量密度和 2.5 kW kg^-1 的功率密度,即使功率提升 10 倍,能量密度仍可保持 66.5 Wh kg^-1。
亮点数据:电解液冰点降至 -91 ℃;Zn2+ 去溶剂化总能由 6.01 eV 降至 5.53 eV;-50 ℃下比容量 165.1 mAh g^-1;10 A g^-1 循环 3000 次容量保持 88.2%。
图文导读
这项工作的核心并不只是“往高盐体系中加入有机溶剂”,而是借助乙腈同步重塑 Zn2+ 的溶剂化壳层和水的氢键网络。图 1 直观展示了这一点:在传统 WIS 中,Zn2+ 主要以 Zn[H2O]6^2+ 形式存在;而在 ws-LWIS 中,ClO4^- 进入第一溶剂化壳层,形成 Zn[H2O]5[ClO]+,从源头上削弱了 Zn2+ 与水分子的束缚。

进一步的理论计算表明,这种新型溶剂化结构不仅改变了配位环境,也实质性降低了界面去溶剂化难度。与 Zn[H2O]6^2+ 相比,Zn[H2O]5[ClO]+ 的总去溶剂化能更低,而且去溶剂化过程中不会像前者那样大量把活性水带到电极界面,因此更有利于低温下的快速电荷转移以及副反应抑制。

电解液微观结构的变化进一步反映在水状态调控上。作者通过 MD、低场 NMR、Raman 和 DSC 证明:引入 AN 后,自由水比例由约 62% 降至约 44%,强氢键比例由 34% 降至 25%,弱氢键占比由 36% 升至 44%,电解液冰点则由 -43 ℃显著下移至 -91 ℃。这说明 ws-LWIS 不仅“更难结冰”,也在更深层次上打乱了有序氢键网络,为超低温离子传输保留了液态环境。

在锌负极界面,ws-LWIS 对沉积行为的改善同样十分明显。Zn||Zn 对称电池在 -50 ℃、1 mA cm^-2 条件下可稳定运行约 1150 h,而对照 WIS 体系约 20 h 即出现短路;原位光学观察也显示,ws-LWIS 中锌沉积更均匀、枝晶显著减少。作者将这一现象归因于弱溶剂化壳层更易去溶剂化,并降低了界面活性水诱发 HER 与枝晶累积的概率。
除电解液外,作者还设计了分级多孔碳纳米笼(HPC-NC)正极,通过纳米笼-微孔-大孔协同结构提升水合 Zn2+ 的入孔可达性与吸附/脱附面积。固态 NMR 结果显示,5 M ws-LWIS 能更有效进入 HPC-NC 孔道内部,说明“弱溶剂化电解液 + 水合离子筛分碳孔”的协同设计,是器件性能提升的另一关键。

在全电池层面,这一协同策略最终转化为突出的超低温综合性能。器件在 -50 ℃下不仅保持较高容量与优异倍率特性,还相较已报道低温 AZHCs 展现出更高的能量-功率组合表现。更重要的是,Zn||HPC-NC 软包电池在 4×6 cm 尺寸下也表现出稳定循环,说明该体系并非停留在材料半电池层面,而已具备向实际低温储能场景放大的潜力。
总结与展望
总体来看,这项工作通过“弱溶剂化局域水盐电解液 + 水合离子筛分碳孔”的双重设计,同时解决了低温水系锌离子混合电容器最棘手的两个问题:一是电解液易冻结、氢键网络过强,二是 Zn2+ 去溶剂化缓慢及界面沉积不稳定。相较于仅靠提高盐浓度或简单加入防冻助剂的思路,该工作更强调从溶剂化化学、界面反应动力学和孔道匹配三个层面进行协同优化。
从应用角度看,这一研究为极寒环境下高功率、高能量水系储能器件的开发提供了新的电解液-电极协同范式,也为寒区便携储能、低温电网调峰和特殊环境电源系统设计提供了参考。未来若能进一步结合更高面容量电极、长寿命软包验证及系统级集成优化,ws-LWIS 体系有望在超低温储能领域展现更大价值。
文献链接:
https://doi.org/10.1016/j.nanoen.2026.111720

声明:

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  1. CONNECT:[ UseTime:0.000487s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000762s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000377s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000497s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000512s ]
  8. SELECT * FROM `article` WHERE `id` = 595498 LIMIT 1 [ RunTime:0.000476s ]
  9. UPDATE `article` SET `lasttime` = 1779523091 WHERE `id` = 595498 [ RunTime:0.004035s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000245s ]
  11. SELECT * FROM `article` WHERE `id` < 595498 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000448s ]
  12. SELECT * FROM `article` WHERE `id` > 595498 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000360s ]
  13. SELECT * FROM `article` WHERE `id` < 595498 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001459s ]
  14. SELECT * FROM `article` WHERE `id` < 595498 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001851s ]
  15. SELECT * FROM `article` WHERE `id` < 595498 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003973s ]
0.131804s