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Ah级海水锌碘电池!南京工业大学王琳,最新EES!

  • 2026-05-09 14:12:23
Ah级海水锌碘电池!南京工业大学王琳,最新EES!

随着海洋能源开发和分布式储能需求的快速增长,安全、低成本且环境友好的储能技术成为关键支撑。以海水为电解质的水系锌离子电池因其资源丰富、成本低廉及天然安全性而受到广泛关注。然而,复杂的海水环境会引发锌负极腐蚀和枝晶生长,同时碘正极存在反应动力学缓慢及多碘离子穿梭效应,严重制约其实际应用性能。

2026年4月23日,南京工业大学王琳、Linghai Zhang、Chenyang Zha在《Energy & Environmental Science》上发表了题为“Activating sp Hybridization of Zinc Iodide via π sp-p Bonding Donation Enables Ah-Level Seawater-based Wearable Zinc-Iodine Pouch Cells”的研究论文,提出一种基于1,3-二氧六环调控的多功能催化策略,通过π sp-p轨道耦合作用,实现电极界面稳定与碘氧化还原动力学的协同提升。

该研究首先从分子层面出发,利用1,3-二氧六环分子中的p轨道与ZnI₂中sp杂化轨道形成π sp-p相互作用,从而调控Zn-I键电子结构。这一过程能够有效降低碘氧化还原反应的能垒,提升ZnI₂转化速率,同时抑制多碘离子的生成与迁移。实验结果表明,在优化浓度(1,3-DX6)条件下,电解液中强氢键比例由30.8%提升至32.8%,弱氢键显著减少,说明体系结构更加稳定。

在负极界面方面,1,3-二氧六环显著提升电解液疏水性,使接触角由76.0°增加至104.8°,有效减少水和溶解氧对锌表面的侵蚀,从而抑制副反应与腐蚀行为。同时,通过原位光学显微观测发现,改性后锌沉积过程始终保持平整致密,而未改性体系则在1000 s内出现明显枝晶结构,表明其对均匀沉积具有显著调控作用。

电化学测试进一步验证了该策略的有效性。Zn//Cu半电池中,改性体系在1 mA cm⁻²条件下可实现99.8%的库伦效率并稳定循环1000次,而未改性体系仅50次即发生短路。在对称电池中,其稳定运行时间可达1800 h以上,远高于未改性体系的150 h。

在正极方面,π sp-p轨道耦合作用显著增强ZnI₂及多碘离子中间体的界面吸附能力,吸附能由-0.58 eV增强至-1.12 eV,同时调控电子态密度,使轨道耦合中心接近费米能级,从而提升反应活性。原位拉曼及UV-Vis测试表明,多碘离子信号显著减弱,穿梭效应得到有效抑制。

在器件层面,Zn-I₂电池表现出优异性能。在10 mA cm⁻²条件下,电池可稳定运行25000次,容量保持约77%,平均库伦效率接近100%。同时,在高负载(40 mg cm⁻²)条件下,软包电池实现1.01 Ah容量,并在100次循环后仍保持约90%的容量。即使在15 mg cm⁻²负载下运行2700次后,容量保持率仍高达95%。

此外,该体系展现出良好的环境适应性与机械稳定性。在0–25℃范围内均能稳定运行,在弯折、压缩等复杂机械形变条件下仍保持约90%以上容量,显示出在可穿戴设备与海洋装备中的应用潜力。

1、提出π sp-p轨道耦合调控机制,实现ZnI₂电子结构优化与反应动力学提升,突破传统催化策略局限。

2、构建界面疏水与电子调控协同体系,同时抑制锌腐蚀、枝晶生长及多碘离子穿梭效应。

3、实现Ah级海水锌碘电池与25000次超长循环性能,兼具高负载能力与优异机械稳定性。

图1 海水锌碘电池应用场景及成本优势与体系挑战

图2 1,3-DX调控氢键结构并提升电解液疏水性与沉积均匀性

图3 界面极化行为优化及锌沉积动力

图4 电化学性能

图5 πsp-p轨道耦合增强Zn-I体系电子结构与反应活性

图6 多碘离子生成与穿梭效应显著抑制

图7 电池在机械变形与温度变化下保持稳定性能

本研究通过引入1,3-二氧六环分子,实现了对海水锌碘电池界面与电子结构的协同调控。π sp-p轨道耦合作用显著提升ZnI₂反应动力学,同时抑制多碘离子穿梭与副反应;疏水界面进一步增强锌负极稳定性。最终实现高负载Ah级电池、25000次超长循环及优异机械稳定性。该工作为海水储能体系提供了新的电子结构调控思路,对海洋能源利用及可穿戴储能器件具有重要应用价值。

文献链接:https://doi.org/10.1039/D6EE00836D

注:本文仅供科研人员学术交流使用,未涉及任何商业用途。由于小编水平有限,文中如有不当或不准确之处,敬请批评指正。如有疑问,欢迎随时联系小编交流探讨。

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  1. CONNECT:[ UseTime:0.000620s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000951s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000389s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000573s ]
  6. SELECT * FROM `set` [ RunTime:0.000220s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000588s ]
  8. SELECT * FROM `article` WHERE `id` = 542933 LIMIT 1 [ RunTime:0.000466s ]
  9. UPDATE `article` SET `lasttime` = 1779243347 WHERE `id` = 542933 [ RunTime:0.000666s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000218s ]
  11. SELECT * FROM `article` WHERE `id` < 542933 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000395s ]
  12. SELECT * FROM `article` WHERE `id` > 542933 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000333s ]
  13. SELECT * FROM `article` WHERE `id` < 542933 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001067s ]
  14. SELECT * FROM `article` WHERE `id` < 542933 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001078s ]
  15. SELECT * FROM `article` WHERE `id` < 542933 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000974s ]
0.077528s