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南京大学周豪慎、何平JACS!!全固态钠氧电池实现化学集成与超长循环

  • 2026-04-29 01:54:25
南京大学周豪慎、何平JACS!!全固态钠氧电池实现化学集成与超长循环

材料研究前沿——聚焦材料科学研究前沿进展。100多万材料领域硕博教师们订阅的微信大号。点击标题下蓝字“材料研究前沿”关注,我们将为您提供有价值、最前沿的材料研究资讯。

钠氧电池因其高理论能量密度和钠资源丰富、成本低廉的特点,被视为下一代储能技术的有力候选者。然而,传统液态钠氧电池面临电解液被超氧自由基分解、漏液及钠枝晶生长导致的安全隐患。全固态架构采用陶瓷电解质可规避这些问题,但固固界面接触差、阻抗高及力学失配等挑战严重限制了其发展。针对这些瓶颈,南京大学周豪慎和何平课题组在Journal of the American Chemical Society上发表研究,提出了一种基于整体式双层β-氧化铝陶瓷骨架的界面工程策略。该工作通过构建一体化多孔-致密结构,消除了电解质与阴极间的宏观物理边界,建立了无缝离子传导通道。同时,采用等离子体增强化学气相沉积技术在骨架上沉积保形石墨碳层,构建三维电子网络,并引入Bi2O3纳米片介导的反应润湿机制,在阳极侧形成梯度混合导电界面。这一设计从根源上改善了界面电荷转移效率,为全固态钠氧电池的性能提升提供了新思路。

研究团队通过精密制备工艺,成功构建了整体式多孔-致密β-氧化铝陶瓷骨架,其多孔部分作为阴极支撑框架,致密部分则充当固态电解质,实现了离子传导的连续性。在阴极侧,利用等离子体增强化学气相沉积方法沉积了约30纳米厚的保形石墨碳层,该碳层均匀覆盖于多孔骨架内部,形成了高保真电子传导网络,显著扩展了三相边界区域,促进了氧气的有效扩散与放电产物的可逆形成与分解。阳极界面处理方面,通过在β-氧化铝表面烧结Bi2O3纳米片涂层,诱导了与金属钠的原位化学反应,生成Na-Bi-O混合导电界面相,有效改善了钠的润湿性,降低了界面阻抗。表征结果显示,碳层分布均匀且无孔隙阻塞,而Bi2O3转化后的界面相具备良好导电性与力学稳定性,从而确保了离子与电子的高效协同传输。

电化学测试表明,基于该界面工程的全固态钠氧电池在室温下实现了4012 mAh g⁻¹的高放电比容量,且在1000 mA g⁻¹高电流密度下仍保持优异性能。对称电池测试显示,改性后的电池在0.25 mA cm⁻²电流密度下稳定循环超过14000小时,远优于未改性体系。机理分析通过原位拉曼光谱和微分电化学质谱证实,固态环境下亚稳态NaO₂得以稳定存在,抑制了歧化副反应,保证了高度可逆的单电子氧化还原过程。此外,软包电池原型在实际应用中展现出596 Wh kg⁻¹的能量密度,验证了该设计的实用潜力。该研究不仅解决了全固态电池中的界面难题,还为高性能储能器件的开发提供了可推广的界面集成策略。

评审过300+份本子后,我揭秘锂电正极立项依据的“必杀技”:拒绝罗列,死磕机制!

工材口国自然基金面上项目青年项目申报书参考范文

基于高熵金属氧化物的析氢析氧反应电催化剂 设计及多元活性位点协同效应研究

基于缺陷工程的多元杂原子掺杂硬碳微观结构优化及储钠性能研究 

基于共轭与杂化策略调控共价有机框架电子离域结构提升锂离子迁移动力学机制研究

基于新型功能单体的凝胶聚合物电解质设计及其钠离子电池界面优化研究 

面向快充锂金属电池的梯度结构石榴石电解质 设计及其界面应力自适应机制研究

非晶氧化物无序局域环境对钌单原子电子结构 的精准调控及其析氧反应路径重构研究

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  1. CONNECT:[ UseTime:0.000480s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000835s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.009833s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000711s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001608s ]
  6. SELECT * FROM `set` [ RunTime:0.000649s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001709s ]
  8. SELECT * FROM `article` WHERE `id` = 518053 LIMIT 1 [ RunTime:0.000996s ]
  9. UPDATE `article` SET `lasttime` = 1777403849 WHERE `id` = 518053 [ RunTime:0.016858s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.002587s ]
  11. SELECT * FROM `article` WHERE `id` < 518053 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001222s ]
  12. SELECT * FROM `article` WHERE `id` > 518053 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001599s ]
  13. SELECT * FROM `article` WHERE `id` < 518053 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008818s ]
  14. SELECT * FROM `article` WHERE `id` < 518053 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005679s ]
  15. SELECT * FROM `article` WHERE `id` < 518053 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008580s ]
0.148915s