A 3D Lithium/Carbon Fiber Anode with Sustained Electrolyte Contact for Solid‐State Batteries,Advanced Energy Materials

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A 3D Lithium/Carbon Fiber Anode with Sustained Electrolyte Contact for Solid‐State Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-12-04 , DOI: 10.1002/aenm.201903325
Ying Zhang ₁ , Yang Shi ₁ , Xin‐Cheng Hu ₁ , Wen‐Peng Wang ₁ , Rui Wen _{1,

2} , Sen Xin _{1,

2} , Yu‐Guo Guo _{1,

2}

Affiliation

To reconcile the energy storage ability and operational safety of lithium metal batteries (LMBs), a transformation from a liquid to a solid‐state system is required. However, Li volume variation, poor interfacial contact, and high operation temperatures hinder its practical applications. To address the above issues, here, an integral structure design for solid‐state LMBs is shown, in which a Li‐preinfused 3D carbon fiber (Li/CF) anode is ionically connected to a cathode via an autopolymerized gel electrolyte. The gel electrolyte helps to encapsulate the liquid electrolyte within the Li/CF anode and the cathode to improve the interfacial contact. The gel also serves as a reservoir that balances the liquid electrolyte supply during repeated Li stripping/plating process. As a result, the symmetrical cells and full cells with Li/CF electrodes exhibit improved cycling stability and effective suppression of dendrites at ambient temperature. This work facilitates the realization of solid‐state LMBs with high energy and high safety.

中文翻译：

带有可持续电解质触点的3D锂/碳纤维阳极，用于固态电池

为了兼顾锂金属电池（LMB）的能量存储能力和操作安全性，需要从液态系统转变为固态系统。然而，锂的体积变化，不良的界面接触以及较高的操作温度阻碍了其实际应用。为了解决上述问题，此处显示了固态LMB的整体结构设计，其中，预浸Li的3D碳纤维（Li / CF）阳极通过自聚合凝胶电解质与阴极离子连接。凝胶电解质有助于将液体电解质封装在Li / CF阳极和阴极内，以改善界面接触。所述凝胶还充当储液器，其在重复的Li汽提/镀覆过程中平衡液体电解质的供应。因此，具有Li / CF电极的对称电池和充满电的电池在环境温度下显示出改善的循环稳定性并有效抑制树枝状晶体。这项工作有助于实现具有高能量和高安全性的固态LMB。

更新日期：2020-01-22

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