当前位置:首页>深圳>【水系锌电】 深圳大学Angew:解锁全各向异性组件集成范式,迈向实用固态锌金属软包电池-Dingtao Ma

【水系锌电】 深圳大学Angew:解锁全各向异性组件集成范式,迈向实用固态锌金属软包电池-Dingtao Ma

  • 2026-06-25 11:40:46
【水系锌电】 深圳大学Angew:解锁全各向异性组件集成范式,迈向实用固态锌金属软包电池-Dingtao Ma

【论文链接】

https://doi.org/10.1002/anie.1641255

【作者单位】

深圳大学

【论文摘要】

高安全性、低成本的锌金属电池在储能领域具有广阔前景,但其有限的能量密度仍是制约其实用化发展的主要瓶颈。本文提出了一种具有全高通量特性的全各向异性组件集成模型,以实现高比能器件。通过利用天然可再生的木质材料,我们在经典的锌-二氧化锰单电子反应体系中验证了其可行性。其中,轻质碳化木材被用作二氧化锰正极和锌负极的通用集流体。同时,我们制备了一种具有垂直取向通道的磷酸盐改性纤维素基水凝胶,以实现电极与电解质界面之间的高电化学相容性。结果表明,该构型实现了锌||钙掺杂二氧化锰软包电池在高载量下(甚至高达50.13 mg cm⁻²)的稳定循环,并具备宽温域工作能力(−30°C至60°C)。令人印象深刻的是,在0.1 A g⁻¹的电流密度下实现了173.2 Wh kg⁻¹的最大能量密度,远超绝大多数已有报道。这项工作这种电池结构模型不仅适用于钒基和锰基正极,还有望拓展至其他多电子反应体系,推动经济型非锂储能电池的快速发

【实验方法】

P-CMC基各向异性凝胶电解质的制备各向异性水凝胶(Aniso-gel)电解质通过定向冷冻策略制备。首先,将0.4 g羧甲基纤维素钠(CMC)在持续搅拌下完全溶解于9.6 g去离子水中。向该溶液中缓慢加入1 mL 4 M磷酸(H₃PO₄),同时搅拌以确保均匀混合。随后将混合物进行短时超声处理(5 min)以消除截留的气泡。脱气后,将溶液浇铸到聚四氟乙烯(PTFE)模具中,并以单向方式冷冻,形成垂直取向的冰模板结构。然后将冷冻样品进行冷冻干燥,得到各向异性磷酸盐改性CMC(P-CMC)膜。将该膜浸泡在含有2 M ZnSO₄和0.2 M MnSO₄的混合水溶液电解质中48 h,以完成离子注入。最后,将溶胀的凝胶沿垂直(z)轴方向(垂直于膜平面)在8 MPa下压缩3 min,以增强界面接触并保持定向排列。

P-CMC基各向同性凝胶电解质的制备为进行对比,各向同性P-CMC基水凝胶电解质(Iso-gel)的制备步骤如下:将0.4 g羧甲基纤维素钠(CMC)在持续搅拌下分散于9.6 g去离子水中直至完全溶解。随后,在搅拌条件下逐渐向溶液中加入1 mL 4 M磷酸(H₃PO₄),以确保均匀性。将所得混合物超声处理5 min以去除截留的气泡。将制备好的溶液浇铸到PTFE模具中,并置于常规冷冻箱中进行随机(非定向)冷冻。完全固化后,将冷冻凝胶冷冻干燥,得到各向同性P-CMC膜。然后将该膜浸泡在含有2 M ZnSO₄和0.2 M MnSO₄的水溶液电解质中48 h,以实现离子吸收和活化。

ACW集流体的制备首先将藤条切割成薄片,并通过浸入15 wt% NaOH溶液中于45°C处理1 h进行碱预处理。用热水充分冲洗后,将预处理后的薄片转移至1.5 wt% H₂O₂溶液中,并在30 W紫外灯下辐照2 h,以进一步去除残留有机物并增强表面活化。将处理后的样品洗涤、干燥,然后在氩气气氛下于管式炉中850°C碳化4 h。所得碳化藤条(CR)使用砂纸进行机械抛光,以获得所需形状和尺寸的集流体。

Ca-MnO₂正极材料的合成具有层间Ca²⁺柱撑和锰缺陷型MnO₂骨架的Ca-MnO₂材料通过一步水热法合成。具体而言,将0.1896 g高锰酸钾(KMnO₄)、0.0338 g一水合硫酸锰(MnSO₄·H₂O)和0.044 g无水氯化钙(CaCl₂)在30 mL去离子水中剧烈搅拌1 h,形成均匀的前驱体溶液。然后将所得混合物转移至50 mL聚四氟乙烯内衬不锈钢高压釜中,于140°C水热处理10 h。自然冷却至室温后,收集产物,用去离子水充分洗涤,并在60°C真空干燥12 h,得到最终的Ca-MnO₂粉末。

H₁₁Al₂V₆O₂₃.₂(AVO)正极材料的合成AVO正极材料采用简便的水热法合成。合成开始时,准确称取2 mmol V₂O₅、4 mmol Al(NO₃)₂·9H₂O和3 mL 30 wt.% H₂O₂溶液,加入60 mL去离子水中,随后剧烈搅拌1 h以实现完全混合。接着,将所得均匀混合物转移至100 mL聚四氟乙烯内衬不锈钢高压釜中,进行水热反应,在180°C下保持16 h。最后,收集合成的Al-VO沉淀物,通过离心分别用去离子水和无水乙醇充分洗涤以确保纯度,然后在80°C烘箱中过夜干燥,得到最终产物。

ACW-MnO₂和ACW-AVO正极的制备将所得Ca-MnO₂和AVO材料与导电炭黑和羧甲基纤维素钠(CMC)粘结剂按7:2:1的质量比混合(除特定高能量密度软包电池按90:5:5的比例制备外),以去离子水作为溶剂形成均匀浆料。然后将该浆料涂覆到ACW集流体上,干燥后得到最终正极。通过控制ACW浸入正极浆料的次数以及调节浆料粘度,实现所需的正极载量。

ACW-Zn负极的合成ACW-Zn通过电沉积法制备。将35 g七水合硫酸锌(ZnSO₄·7H₂O)、35 g硫酸钠(NaSO₄)和6 g硼酸溶解于80 mL去离子水中。将ACW作为工作电极浸入上述溶液中,采用三电极体系进行电沉积,其中铂片为对电极,Ag/AgCl电极(饱和KCl)为参比电极。在−40 mA cm⁻²下电沉积60 min后,将样品用去离子水洗涤并干燥。产物命名为ACW-Zn。

【图文摘取】

【主要结论】

本文开发了一种全各向异性高通量组件集成模型,用于发展高能量密度锌金属电池。

(1)为证明其可行性,采用轻质各向异性碳化木材作为双功能集流体,实现了高效传质、电子传导以及高结构保真度,使电极能够在高载量条件下运行。与此同时,通过定向冷冻法制备了各向异性磷酸盐改性纤维素基水凝胶电解质,该电解质可提供垂直取向的离子传导通道并增强机械强度,从而确保均匀的锌沉积并抑制枝晶生长。

(2)以代表性的锌-二氧化锰体系为例,结果表明,这种全各向异性结构集成模型使ACW-MnO₂|P-CMC Aniso-gel|ACW-Zn软包电池在0.1 A g⁻¹电流密度下(25°C)实现了173.2 Wh kg⁻¹的最大能量密度,并在−30°C至60°C的宽温域范围内于实际条件下实现了长期稳定循环。此外,这种设计范式还可适用于钒基(AVO)正极体系,以实现类似的高比能要求。

本工作旨在为高比能锌金属电池塑造一种结构模型设计范式,并为下一代多价态储能器件的发展建立一个通用框架。

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  1. CONNECT:[ UseTime:0.000738s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000966s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000332s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000310s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000722s ]
  6. SELECT * FROM `set` [ RunTime:0.000219s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000729s ]
  8. SELECT * FROM `article` WHERE `id` = 618564 LIMIT 1 [ RunTime:0.000521s ]
  9. UPDATE `article` SET `lasttime` = 1782468874 WHERE `id` = 618564 [ RunTime:0.008247s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000317s ]
  11. SELECT * FROM `article` WHERE `id` < 618564 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000609s ]
  12. SELECT * FROM `article` WHERE `id` > 618564 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000473s ]
  13. SELECT * FROM `article` WHERE `id` < 618564 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001326s ]
  14. SELECT * FROM `article` WHERE `id` < 618564 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003681s ]
  15. SELECT * FROM `article` WHERE `id` < 618564 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003816s ]
0.091261s