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『钠电』南京大学周豪慎、中南大学常智团队 Nature Communications:MOF 玻璃包覆策略构筑筛分型硬碳负极实现超长稳定钠离子存储

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『钠电』南京大学周豪慎、中南大学常智团队 Nature Communications:MOF 玻璃包覆策略构筑筛分型硬碳负极实现超长稳定钠离子存储
【背景挑战】
硬碳材料原料来源广泛、嵌钠电位低,是钠离子电池最具产业化潜力的负极材料。但传统纯硬碳存在两大核心界面与动力学短板,严重制约长循环与高倍率实用化:脱溶剂动力学迟缓:硬碳孔径分布杂乱,大孔道允许溶剂与钠离子共嵌入,超微孔完全阻隔离子传输,溶剂化离子脱溶剂势垒极高,电荷转移动力学极差;面膜无序劣化:碳表面大量缺陷位点持续诱发电解液分解,生成厚、组分杂乱的富有机固态电解质界面(SEI),不可逆容量损失大、初始库伦效率偏低,循环过程界面持续破损再生,造成容量快速衰减。现有硬碳改性手段仅聚焦孔结构刻蚀、碳层包覆,无法同步实现精准离子筛分与均质稳定 SEI 原位生长,难以兼顾快速脱溶剂与长效界面保护双重需求。
【文献导入】
本工作提出低温熔融包覆工艺,将咪唑磷酸锌 MOFZnPIm)熔融后在硬碳颗粒表面原位构筑连续 MOF 玻璃薄层(简写 g-ZnPIm),得到HC@g-ZnPIm复合负极。熔融 MOF 冷却形成亚纳米限域孔道,具备尺寸筛分效应:仅允许脱溶剂钠离子穿过,阻隔有机溶剂分子接触碳基底;充放电过程表层卤素、磷基位点诱导生成内层富氟化钠、外层薄有机梯度 SEI 膜。该 MOF 玻璃包覆层同时实现三大功能:降低钠离子脱溶剂活化能、加速界面离子输运、抑制溶剂共嵌入与过渡副反应。配套同步辐射 XRDCO₂吸附、SAXS、原位拉XPS 深度刻蚀、TEMNMR、电化学阻抗 DRTGITT、长循环半电池 / 全电池完成全维度机理验证。优化后的HC@g-ZnPIm可逆容量达 462.2 毫安时每克,安每克循环 4000 圈容量保持 89.1%安每克循环 8000 圈容量保留 95.3%,兼具超高倍率与超长效循环稳定性,为硬碳负极界面精准调控提供全新熔融 MOF 玻璃改性范式。
【创新点】
制备工艺创新:开发 158 摄氏度低温熔融包覆法,无需有机溶剂浸润,直接在硬碳表面生成无裂纹连续 MOF 玻璃薄膜,不破坏碳本征孔结构,工艺简单易放大;
筛分机理创新:首次证实 g-ZnPIm亚纳米孔道(约 0.35 纳米)具备精准离子筛分能力,从源头杜绝溶剂共嵌入,大幅降低脱溶剂与电荷转移双重活化能;
界面调控创新:MOF 玻璃表层位点诱导梯度型富NaF SEI,外层薄有机层适配碳体积形变,内层无机层高速传导钠离子,解决传统厚有机 SEI 阻抗高、易破碎问题;
应用创新:实现万级超长循环寿命,醚 / 碳酸两类电解液体系均适配,具备优异全电池匹配性能,兼顾高容量、高初始库伦效率、超宽倍率区间三大优势。
【图文详解】
 1 MOF 玻璃包覆硬碳的结构设计与多尺度表征
纯硬碳HC@g-ZnPIm界面行为对比示意图;ZnPIm熔融包覆制备流程示意图;原始硬碳 TEM 图;HC@g-ZnPIm透射电镜图;复合电极元素面扫分布图;纯硬碳 CO₂吸附等温线;纯硬碳孔径分布;HC@g-ZnPIm CO₂吸附等温线;iHC@g-ZnPIm孔径分布
1纯硬碳无界面筛分层,电解液溶剂自由渗透,生成厚且不均匀有机 SE,大量溶剂共嵌入破坏碳骨架;HC@g-ZnPIm表面连续 MOF 玻璃薄层可筛分溶剂化离子,诱导超薄富无机 SE 稳定生长。
2ZnPIm粉末 158 摄氏度熔融浸润碳颗粒表面,快速冷却发生配位重排,形成厚度约 3 纳米无裂纹均质玻璃包覆层,XRDDSC 验证晶态 MOF 完全转变为无定形玻璃相。
3TEM 与元素 mapping 证明 ZnPN元素均匀全覆盖硬碳,无局部裸露缺陷;CO₂吸附与 SAXS 结果显示包覆后比表面积由 18.3 平方米每克降至 12.7 平方米每克,表层大孔被修饰,内部储钠密闭孔完整保留,平均孔径由 1.28 纳米收缩至 1.02 纳米。
 2 原位拉与动力学测试解析筛分诱导脱溶剂效应
纯硬碳放电过程原位拉等高图;HC@g-ZnPIm放电原位拉等高图;脱溶剂过程阿伦尼乌斯拟合曲线;电荷转移活化能拟合曲线;放电态固态 ²³Na 核磁谱;f MOF 玻璃筛分脱溶剂机理示意图
1纯硬碳体系六氟磷酸根拉曼峰持续红移,二乙二醇溶剂特征峰强度大幅衰减,证实阴离子无序吸附、溶剂共嵌入严重;HC@g-ZnPIm电解液特征峰全程稳定,溶剂渗透被完全阻断。
2)动力学计算:纯硬碳 SE 活化能 8.01 千焦每摩尔、电荷转移活化能 8.09 千焦每摩尔;改性样品分别降至 6.136.57 千焦,筛分孔道大幅降低离子脱溶剂阻力。
3²³Na 固态核磁显示改性电极在 0 ppm 附近钠信号显著增强,证明筛分作用促进脱溶剂钠离子进入碳密闭孔,生成类金属钠团簇,提升可逆储钠容量
4)机理图说明 0.35 纳米亚纳米通道介于溶剂化离子与裸钠离子尺寸之间,依靠空间位阻剥离溶剂壳,实现预脱溶剂,同步优化界面离子传导环境。
 3 循环过程阻抗演化与钠离子扩散动力学
首圈充放电纯硬碳奈奎斯特图;纯硬碳放电 DRT 分布图;纯硬碳充电 DRT 分布图;HC@g-ZnPIm首圈奈奎斯特图;HC@g-ZnPIm充电 DRTHC@g-ZnPIm放电 DRTg SE 阻抗随循环变化曲线;电荷转移阻抗演化曲线;i纯硬碳 GITT 曲线;HC@g-ZnPIm GITT 曲线;筛分孔道调控离子输运模型
1DRT 图谱证明纯硬碳弛豫峰宽而分散,离子传输动力学不均HC@g-ZnPIm弛豫峰尖锐集中,界面离子通路高度均质。
2)长循环阻抗监测:改性样品 SE 膜阻抗、电荷转移阻抗全程维持低水平且波动极小;裸碳阻抗持续飙升,界面不断破损重构。
3GITT 测试改性材料钠离子扩散系数提升一个数量级,充放电平台更平直,碳内部离子嵌入脱出可逆性显著提升,源于 MOF 玻璃持续稳定的筛分界面。
 4 半电池倍率与长循环电化学性能
前三圈充放电曲线对比;梯度倍率性能曲线;不同倍率平台 / 斜坡容量占比;d 0.2 安每克循环曲线;e 0.5 安每克长循环;f 1 安每克四千圈循环;g 2 安每克八千圈超长循环;近年硬碳文献性能雷达对比
10.02 安每克低电流下HC@g-ZnPIm首圈库伦效率 86.1%裸碳仅 79.5%,界面副反应被大幅抑制。
20.02  2 安全区间倍率容量均高于纯硬碳,电流恢复至低容量可完全回弹,动力学可逆性优异;平台储钠容量比显著提升,类金属钠团簇储钠机制被充分激活。
3安每克循环 4000 圈容量保有 89.1%安每克循环 8000 圈容量保留 95.3%,远优于未改性硬碳,在醚、碳酸两类电解液中循环稳定性均大幅提升。
 5 循环后界面微观结构与储钠机理表征
a 50 后裸碳 TEM裸碳 XPS 氟深度刻蚀谱;c 50 HC@g-ZnPIm透射图;改性电极氟元素深度 XPS循环碳 1s 谱(裸碳);循环碳 1s 谱(改性);裸碳钠 1s 谱;HC@g-ZnPIm 1s 谱;i裸碳原位充放电等高图;HC@g-ZnPIm原位拉低频钠团簇拉信号;l MOF 玻璃调控储钠完整机理图
1)循环后裸碳表面 SE 厚度 7.5 纳米,组分杂乱富有机;HC@g-ZnPIm 2.8 纳米超薄梯度界面,内层富集NaF无机相,XPS 刻蚀随深度氟化物信号持续增强。
2)原位拉证明改性碳 D峰充放电可逆偏移,碳层无不可逆堆叠坍塌;低频拉可检测大量类金属 Na8 团簇,裸碳团簇信号微弱。
3)完整机理:MOF 玻璃亚纳米通道筛分脱溶剂钠离子,在碳密闭孔内可逆生成钠团簇;梯度富NaF SE 隔绝电解液副反应,实现动力学与结构双重稳定。
【结论总结】
针对硬碳负极溶剂共嵌入、无序厚 SE 两大核心缺陷,本工作提出低温熔融 MOF 玻璃包覆改性策略,利用ZnP熔融冷却构筑连续含 0.35 纳米亚纳米筛分通道的复合界面。该薄层依靠尺寸筛分效应实现钠离子预脱溶剂,大幅降低脱溶剂与电荷转移活化能;充放电过程原位生成外层薄有机、内层富氟化钠梯度 SE 膜,抑制电解液持续分解与碳结构不可逆破坏。HC@g-ZnPIm复合负极可逆容量可达 462.2 毫安时每克,兼顾优异倍率性能与超长循环寿命,安每克四千圈、安每克八千圈容量保持率分别为 89.1%95.3%,醚系、碳酸电解液及匹配硬碳全电池均表现突出。该熔融 MOF 玻璃界面筛分策略为高性能、长寿命钠离子硬碳负极提供普适性表面修饰新思路,推动低成本钠储能负极材料实用化发展。
【文献速递】
Metal–organic framework glass enables durable sodium-ion storage for hard carbon negative electrodes, Nature Communications, 2026; https://doi.org/10.1038/s41467-026-75060-2
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  1. CONNECT:[ UseTime:0.000544s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000903s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005520s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000319s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000493s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000645s ]
  8. SELECT * FROM `article` WHERE `id` = 598325 LIMIT 1 [ RunTime:0.009418s ]
  9. UPDATE `article` SET `lasttime` = 1784196364 WHERE `id` = 598325 [ RunTime:0.011326s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000250s ]
  11. SELECT * FROM `article` WHERE `id` < 598325 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000574s ]
  12. SELECT * FROM `article` WHERE `id` > 598325 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000356s ]
  13. SELECT * FROM `article` WHERE `id` < 598325 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018052s ]
  14. SELECT * FROM `article` WHERE `id` < 598325 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013464s ]
  15. SELECT * FROM `article` WHERE `id` < 598325 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015151s ]
0.176639s