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『水系锌电』南京大学等团队 Angew:高熵水系电解液诱导贫水溶剂化结构与梯度界面,实现长寿命锌金属负极

  • 2026-02-07 08:18:42
『水系锌电』南京大学等团队 Angew:高熵水系电解液诱导贫水溶剂化结构与梯度界面,实现长寿命锌金属负极
【背景挑战】
水系离子电池(AZIBs因锌金属阳极高理论容量(820 mAh g⁻¹)、低氧化还原电位(-0.76 V vs. 标准氢电极)、安全性高、环境友好及成本低廉等优势,成为大规模储能的理想候选。然而,锌金属阳极面临枝晶生长、析氢反应及界面副反应等问题,导致电池容量快速衰减,严重制约其实际应用。电解液工程是稳定金属阳极的有效策略,但单一溶质或溶剂添加剂难以满足循环稳定性需求,现有高熵电解液室温下循环寿命普遍不超过 3500 h,无法实现长周期服役。开发兼具低水活性、优界面稳定性及高离子传输效率的多功能电解液体系,成为突破金属阳极性能瓶颈的关键。
【文献导入】
现有研究通过高熵理念调控电解液理化性质,在抗冻性等方面取得进展,但在抑制析氢腐蚀、构筑稳定固液界面及延长室温循环寿命方面仍有不足。本研究创新性地设计了一种多组分高熵水系电解液,以等摩尔量的三氟甲磺酸锌(Zn (OTf)₂)和三氟甲磺酸锂(LiOTf)为溶质,去离子水(H₂O)、三乙基磷酸酯(TEP)和二甲基亚砜(DMSO)为等体积混合溶剂。该电解液通过提升溶剂化熵,重构 Zn²⁺溶剂化结构与氢键网络,在锌阳极表面原位形成梯度固体电解质界面相(SEI)与阳离子静电屏蔽层,协同抑制枝晶生长与析氢反应,使锌对称电池循环寿命突破 8000 h,为长寿命金属阳极提供了新的电解液设计思路。
【创新点】
体系设计创新:首次构建 “双溶质 - 三溶剂” 高熵电解液体系,通过多组分协同作用提升溶剂化熵,突破单一添加剂功能局限,实现水活性调控、界面优化与离子传输强化的一体化;
作用机制创新:高给电子数的 TEP  DMSO 替代 Zn²⁺溶剂化壳层中的水分子,形成贫水溶剂化结构;Li⁺构建动态静电屏蔽层均匀电场分布;电解液组分原位分解形成无机富集体梯度 SEI 层,三重机制协同抑制枝晶与副反应;
性能指标跃升:锌 // 锌对称电池在 1 mA cm⁻²0.5 mAh cm⁻² 条件下稳定循环超 8000 h,锌 // 五氧化二氮水合物(V₂O₅H₂O)软包电池 1 A g⁻¹  420 次循环容量保持率达 83.1%,库仑效率稳定在 99.4%,显著优于现有电解液体系。
【图文详解】
 1:高熵电解液的作用机制与结构表征示意图
1. (a) 高熵电解质的溶剂化结构。(b) 高熵电解质的原理及作用机制。(c) SEI的主要组分。(d) 氢气析出反应与腐蚀的抑制。(e) Li+的静电屏蔽机制。
系统阐明高熵电解液的多功能协同机制:
溶剂化结构重构:TEP  DMSO 凭借高给电子数(DN)取代 Zn²⁺溶剂化壳层中的水分子,使溶剂化结构从 [Zn (H₂O)₅(OTf)]⁺转变为 [Zn (H₂O)₂(OTf)₂(TEP)(DMSO)],贫水特性显著降低水诱导腐蚀;
氢键网络调控:多组分相互作用削弱水分子间强氢键比例(从 35.53% 降至 9.66%),增强水分子与添加剂的结合,抑制自由水活性与析氢反应;
梯度 SEI 层形成:OTfTEP  DMSO 原位分解,形成外层为ZnCO₃/ZnO/ZnP₂O、内层为 ZnS/ZnF₂/ZnP₂O的致密 SEI 层,厚度约 48 nm,阻隔水与阳极接触;
静电屏蔽效应:Li⁺优先吸附于阳极凸起尖端,形成正电荷屏蔽层,排斥 Zn²⁺远离尖端,促进均匀沉积,抑制枝晶生长
 2:电解液理化性能与溶剂化结构表征
2(a)常见溶剂的供体数量。(b)实验数据与(c)理论计算推导的不同电解质体系熵变。(d)不同电解质中O-H伸缩振动的 FTIR (e)拉曼光谱。(f)裸露电解质、(g)TEP+DMSO电解质及(h)HE电解质的三维瞬态结构,以及通过分子动力学模拟获得的Zn²⁺溶剂化结构。基于分子动力学模拟获得的(i)裸露电解质、(j)TEP+DMSO电解质和(k)HE电解质的径向分布函数与配位数分布函数。
通过理化表征验证电解液核心优势:
熵增效应显著:高熵电解液的溶剂化熵变是裸电解液的 3 ,降低 Gibbs 自由能,促进稳定溶剂化结构形成,避免循环过程中相分离与浓度梯度;
水活性抑制:FTIR  Raman 光谱证实水分子 O-H 键增强、氢键网络重构,¹H NMR 化学位移从 4.72 ppm 降至 4.32 ppm,有效降低水的化学活性;
界面相容性优异:接触角从 72.8° 降至 45.3°,提升电解液与锌阳极的润湿性,促进 Zn²⁺均匀成核;电化学窗口拓宽,析氢速率降至 0.08 mmol cm⁻² h⁻¹仅为裸电解液 1/3
 3阳极界面行为与结构稳定性表征
3.(a)裸露电解液与(b)氢氧化铝电解液180秒后的电场分布模拟。(c)裸露电解液与(d)氢氧化铝电解液180秒后的Zn2+浓度场分布模拟。(e)裸露电解液与(f)氢氧化铝电解液30次循环后Zn阳极的SEM图像。(g)裸露电解液与(h)氢氧化铝电解液30次循环后Zn电极表面的三维共聚焦激光扫描显微镜图像及对应表面粗糙度曲线。(i)30次循环后Zn阳极的 XRD 形貌。(j)裸露电解液与氢氧化铝电解液中Zn电镀过程的原位光学显微镜图像。
通过界面与结构测试揭示电解液对锌阳极的保护作用:
电场与浓度分布均匀:Li⁺静电屏蔽效应削弱凸起尖端电场强度,避免 Zn²⁺局部富集,循环后阳极表面粗糙度从 9.646 μm降至 2.793 μm
沉积形貌优化:原位观察显示高熵电解液中锌沉积表面平整无枝晶,而裸电解液中 60 min 即形成苔藓状枝晶;XRD 未检测到腐蚀产物,证实副反应被有效抑制;
结构稳定性增强:循环后锌阳极无明显腐蚀与粉化,SEI 层致密且机械强度高,能抵御外部应力与枝晶穿透
 4:电池电化学性能测试
4. (a) 不同电解质的接触角。(b) LSV曲线,(c) 氢析出速率曲线,(d) Tafel曲线,(e) CV曲线,(f) CA曲线。 (g) 不同电解质的Zn//Cu不对称电池的CE曲线。(h) HE电解质的Zn//Cu不对称电池电压-容量曲线。不同电解质的Zn//Zn对称电池在(i) 5 mA cm-2mAh cm-2  (j) 1 mA cm-20.5 mAh cm-2 条件下的恒电流循环。(k) 雷达图
电化学性能测试验证电解液优势:
循环稳定性优异:Zn//Zn 对称电池 1 mA cm⁻² 下循环超 8000 h5 mA cm⁻² 下循环 800 h,远优于现有体系;Zn//Cu 电池 1400 次循环平均库仑效率达 99.4%
动力学性能提升:脱溶剂化活化能低至 24.9 kJ mol⁻¹,促进 Zn²⁺传输;CA 曲线显示 244 s 即进入三维扩散阶段,利于致密沉积;
腐蚀抑制显著:腐蚀电位从 - 0.963 V 提升至 - 0.936 V,有效降低阳极腐蚀速率,提升电池储存与循环稳定性。
 5SEI 层结构与成分表征及全电池性能
5. (a) 裸电解质和HE电解质中溶剂化结构的 LUMO HOMO能级。(b) HE电解质中ZnF+、硫化锌+PO3+Zn+ TOF -SIMS三维光谱。(c) HE电解质中经过30循环后锌阳极表面的F 1s(d) S 2p(e) P 2p的深度 XPS 光谱。(f) HE电解质中经过30循环后锌阳极TEM(g-k) HRTEM 图像
SEI 层表征
能级调控促进 SEI 形成:高熵电解液的 LUMO 能级(-2.06 eV)低于电解液(-1.50 eV),HOMO 能级(-6.47 eV)高于电解液(-6.95 eV),利于有机分子优先接受电子并原位分解形成 SEI
SEI 层成分梯度分布:TOF-SIMS  XPS 深度分析表明,ZnCOZnO位于 SEI 外层,ZnSZnF位于内层,ZnP₂O均匀分布,形成无机富集体梯度结构
SEI 层结构致密:TEM 图像显示 SEI 层厚度约 48 nm,无明显孔隙;HRTEM 观察到ZnF101)、ZnS200)、ZnP₂O240)等晶格条纹,证实无机相的存在,提升 SEI 层机械强度与离子传输效率;
6. (a) HE电解质在1 mV s-1扫描速率下的初始六次循环伏安曲线。(b) 未包覆与HE电解质的循环伏安曲线。(c) 未包覆与(d) HE电解质的自放电分析。(e) Zn//五氧化二钒·水全电池在未包覆与HE电解质下的速率性能。(f) 不同电流密度下HE电解质的 GCD 曲线。(g) 0.2 A g-1(h) 1 A g-1电流密度下未包覆与HE电解质的Zn//五氧化二钒·水全电池循环稳定性。(i使用HE电解质串联三个Zn//五氧化二钒·水袋电池为LED充电的演示。(j) 1 A g-1电流密度下未包覆与HE电解质的Zn//五氧化二钒·水袋电池循环稳定性。
全电池展示实际应用潜力:
 SEI 层结构明确:无机富集体梯度结构促进 Zn²⁺快速传输,机械强度高且能抑制水渗透;
全电池性能稳定:Zn//V₂O₅电池 0.2 A g⁻¹  350 次循环容量保持率 80.4%1 A g⁻¹  1200 次循环保持率 83.8%
实用化前景广阔:5 cm×5 cm 软包电池 420 次循环容量保持率 83.1%,串联可驱动 LED,为大规模储能应用提供可能。
【结论总结】
本研究设计了一种新型高熵水系电解液,通过 “双溶质 - 三溶剂” 的多组分协同设计,实现了溶剂化结构调控、氢键网络重构与界面相优化的一体化。该电解液利用 TEP  DMSO 的高给电子特性形成贫水 Zn²⁺溶剂化结构,Li⁺的静电屏蔽效应促进均匀沉积,多组分原位分解形成梯度 SEI 层抑制副反应,三者协同作用使锌金属阳极循环寿命大幅提升。对称电池循环超 8000 h,软包全电池循环稳定性优异,验证了该高熵电解液的实用价值。该设计思路为利用多组分协同效应优化锌 / 电解液界面、提升金属阳极稳定性提供了重要参考,对推动水系离子电池的大规模应用具有重要意义。
【文献速递】
High-Entropy Aqueous Electrolyte Induced Formation of Water-Poor Zn²⁺ Solvation Structures and Gradient Solid-Electrolyte Interphase for Long-Life Zn-Metal Anodes. Angewandte Chemie International Edition, 2025; https://doi.org/10.1002/anie.202425008
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  1. CONNECT:[ UseTime:0.000492s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000921s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000839s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000461s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000632s ]
  6. SELECT * FROM `set` [ RunTime:0.006995s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000707s ]
  8. SELECT * FROM `article` WHERE `id` = 479240 LIMIT 1 [ RunTime:0.002820s ]
  9. UPDATE `article` SET `lasttime` = 1770440536 WHERE `id` = 479240 [ RunTime:0.004378s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000323s ]
  11. SELECT * FROM `article` WHERE `id` < 479240 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000655s ]
  12. SELECT * FROM `article` WHERE `id` > 479240 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000721s ]
  13. SELECT * FROM `article` WHERE `id` < 479240 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005666s ]
  14. SELECT * FROM `article` WHERE `id` < 479240 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.029440s ]
  15. SELECT * FROM `article` WHERE `id` < 479240 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020728s ]
0.144714s