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深圳大学张培新/马定涛团队最新Angew. :解锁全各向异性组分集成范式,面向实用化准固态锌金属软包电池

  • 2026-06-16 21:16:41
深圳大学张培新/马定涛团队最新Angew. :解锁全各向异性组分集成范式,面向实用化准固态锌金属软包电池
水系锌金属电池(ZMBs)因高安全性、低成本和环境友好备受关注,但器件级能量密度偏低(通常仅30–80 Wh kg⁻¹)始终是产业化瓶颈。传统研究聚焦电极材料改性,忽视了对电池组件结构特征与跨组分界面兼容性的系统考量——厚电极中Zn²⁺迁延曲折的离子通路(tortuous pathway)与严重的浓差极化,导致高载量下活性物质利用率骤降。
近日,深圳大学化学与环境工程学院张培新课题组(通讯作者:马定涛、张培新)联合香港城市大学、广东工业大学在《Angewandte Chemie International Edition》发表研究:提出全各向异性组分高通量集成模型(All-Anisotropic-Component Integrated Model),以天然可再生木材为基材构建各向异性碳化木(ACW)双向集流体/骨架,并设计磷酸改性纤维素各向异性水凝胶(P-CMC Aniso-gel)作为准固态电解质,使正极、负极、电解质三者垂直对齐孔道形成连续低迂曲度Zn²⁺传输通道。
该Zn||Ca-MnO₂软包电池在MnO₂载量高达50.13 mg cm⁻²时仍可稳定循环,最大能量密度达173.2 Wh kg⁻¹(0.1 A g⁻¹),超越绝大多数已报道水系锌电池,并在−30°C至60°C宽温域下正常运行。此工作为突破锌电池能量密度天花板提供了"跨组分结构匹配"的全新器件工程范式。
图1|全各向异性集成策略的设计理念与器件能量密度制约因素分析

一、各向异性碳化木(ACW)——轻质双功能集流体与三维宿主

天然藤黄檀(Manau rattan)木材经定向碳化保留垂直排列开放微管胞通道,电导率沿通道方向达110±8.6 S cm⁻¹,可同时充当正极和负极的轻质导电骨架,替代传统铜/铝集流体与泡沫镍,显著降低非活性质量(m_total)。
ACW-MnO₂正极:Ca-MnO₂纳米片沿ACW内壁通道conformal 生长,垂直贯通孔道允许电解液深层渗透,Zn²⁺迁移平行于电场方向,确保整个厚度方向均相氧化还原反应。即使MnO₂载量提至~50.4 mg cm⁻²,通道残留空隙仍保障液相浸润,表层接触角仅23.1°,EDS证实Mn元素贯穿截面均匀分布。
ACW-Zn负极:Zn电沉积限域于ACW有序微通道内(实测沉积量对应~25.3 mAh cm⁻²,远低于ACW宿主理论容纳容量~73 mAh cm⁻²),受限几何空间重新分配局部电场,引导Zn²⁺通量平行通道生长,抑制枝晶与局部场增强;可通过控制沉积量精确匹配高载量正极容量,使N/P比运行于理论最佳窗口(本工作取N/P≈1.7)而非靠盲目减薄锌箔。ACW-Zn表面经调控呈适度疏水(接触角78.5°),兼顾离子通透与抑制析氢腐蚀。
图2|仿生高通量电极与水凝胶电解质的设计原理。

二、磷酸改性纤维素各向异性水凝胶(P-CMC Aniso-gel)

采用定向冷冻法诱导羧甲基纤维素(CMC)前驱体沿温度梯度定向结晶,酸诱导交联同时引入磷酸根基团(–PO₄²⁻)制得P-CMC Aniso-gel:
结构各向异性:横截面SEM显示完美平行层状纳米通道贯穿膜厚方向,与ACW垂直孔道取向匹配,构建器件级连续Zn²⁺高速公路,大幅降低迂曲度。垂直方向杨氏模量与抗拉强度(3.46 MPa)为横向3倍以上,具抗穿刺能力与良好柔韧性(>500次弯折不裂)。
磷酸基调控配位化学:FT-IR/XPS证实P=O与P–O–C键成功引入。磷酸氧提供丰富Zn²⁺配位位点,分子动力学模拟显示Zn–O平均配位数由CMC中4.89升至P-CMC中6.47,Zn²⁺迁移能垒由~1.3 eV降至0.8 eV,促进可逆Zn²⁺跳跃传输。致密氢键网络(H-键数~90 vs CMC ~65)维持结构稳定性。
原位ZPO衍生SEI:循环中磷酸物种促使负极表面生成Zn₃(PO₄)₂·4H₂O(ZPO)富集固态电解质界面,离子导通但电子绝缘,抑制析氢与腐蚀,诱导Zn (002)晶面择优取向沉积。
图3|高通量电极与水凝胶电解质的结构特征。

三、全各向异性集成器件的电化学行为与界面演化

3.1 锌沉积/剥离界面稳定性

同步辐射X-ray CT与原位光学观测对比:各向同性凝胶(Iso-gel)中Zn呈苔藓状枝晶穿透凝胶基质;Aniso-gel体系中Zn沉积平整致密,截面呈连续金属层紧贴ACW骨架。有限元模拟(FEM)显示Aniso-gel内部电场与电流密度均匀分布,消除尖端放大效应。DRT分析表明Aniso-gel体系电荷转移与扩散电阻峰窄且稳定,无副产物累积导致阻抗增长。
图4|全高电流锌金属袋式电池的电化学性能测试。

ACW-Zn||Cu半电池库伦效率>99%(400周);ACW-Zn||ACW-Zn对称软包在30 mA cm⁻²、10 mAh cm⁻²下稳定循环>1200 h,临界电流密度达50 mA cm⁻²,2 MPa外压下仍保持稳行——验证各向异性框架耐受机械形变。

3.2 全电池性能——高能量密度与宽温域

组装ACW-MnO₂ | P-CMC Aniso-gel | ACW-Zn准固态软包电池:
能量密度:0.1 A g⁻¹下面容量296.9 mAh g⁻¹,平均放电平台~1.35 V,按全电池总质量(含外壳外接线除外活性组件总和9.28 g)计算能量密度达173.2 Wh kg⁻¹,超越已报道准固态锌电池水平。
宽温运行:−30°C容量119.6 mAh g⁻¹(25°C为155.9 mAh g⁻¹),60°C为210.1 mAh g⁻¹,2000周容量保持率高;−30°C下器件级能量密度仍达100.9 Wh kg⁻¹。低温下对齐纳米通道保障离子导通,高温下磷酸配位锁定自由水抑制副反应。
普适性验证:同架构匹配钒基正极(ACW-AVO)同样获高比能与宽温性能(25°C能量密度149.3 Wh kg⁻¹),证明全各向异性集成模型可拓展至多价态反应体系。
演示应用:12层串联软包输出22 V / 22 W,可驱动小型无人机稳定飞行。
图5|关于基于ACW-Zn|P-CMC凝胶和ACW-Zn对称电池系统中锌沉积机制的研究。

四、核心机理提炼——为何"全各向异性匹配"是关键?

传统锌电池采用随机多孔电极+无规隔膜/凝胶,Zn²⁺在厚正极内需经历漫长迂曲扩散后方能到达深层,导致外部反应过度、内部"死区",高载量反而拉低利用率。本工作三重各向异性协同

组件

各向异性特征

功能贡献

ACW正极

垂直开放微管+MnO₂壁载

电解液深层渗透,Zn²⁺平行电场迁移,高载量η↑

ACW负极

垂直微通道限域Zn沉积

电场重分布,N/P可控匹配,枝晶抑制

P-CMC Aniso-gel

定向层状纳米通道+磷酸配位

低迂曲度Zn²⁺高速路,ZPO-SEI界面钝化,力学抗穿刺

三者通道取向一致(through-plane alignment)使离子流线直、平行、均匀,最大限度降低浓差极化,让"高正极载量+近优N/P比+轻量集流体"的理论增益真正兑现为器件级高能量密度。

五、研究团队与论文信息

通讯作者:马定涛、张培新
第一作者:马定涛
单位:深圳大学化学与环境工程学院;香港城市大学机械工程系;广东工业大学生物医药学院
基金:深圳市科技创新委、广东省自然科学基金、国家自然科学基金等

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  1. CONNECT:[ UseTime:0.001092s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001566s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000676s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006081s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001375s ]
  6. SELECT * FROM `set` [ RunTime:0.001866s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001536s ]
  8. SELECT * FROM `article` WHERE `id` = 616482 LIMIT 1 [ RunTime:0.000992s ]
  9. UPDATE `article` SET `lasttime` = 1781956865 WHERE `id` = 616482 [ RunTime:0.002904s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000316s ]
  11. SELECT * FROM `article` WHERE `id` < 616482 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000551s ]
  12. SELECT * FROM `article` WHERE `id` > 616482 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000355s ]
  13. SELECT * FROM `article` WHERE `id` < 616482 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000618s ]
  14. SELECT * FROM `article` WHERE `id` < 616482 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000662s ]
  15. SELECT * FROM `article` WHERE `id` < 616482 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002121s ]
0.175300s