A Novel Mechanically Robust Leaf‐Shaped Tin Dioxide Li‐Ion Battery Anode and Its Dynamic Structural Transformation and Electron‐Transfer Simulation,Energy Technology

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A Novel Mechanically Robust Leaf‐Shaped Tin Dioxide Li‐Ion Battery Anode and Its Dynamic Structural Transformation and Electron‐Transfer Simulation
Energy Technology ( IF 3.6 ) Pub Date : 2020-01-20 , DOI: 10.1002/ente.201901149
Jinyun Liu ₁ , Mengying Cheng ₁ , Tianli Han ₁ , Qianqian Lu ₂ , Haikuo Zhang ₂ , Ping Zhou ₃ , Yonghong Ni ₁ , Jinjin Li ₂

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Current high‐energy‐density secondary battery electrodes have several issues, in major part due to mechanical instabilities. Herein, a novel, mechanically robust anode is presented, which consists of a leaf‐shaped architecture with high lithium‐storage performance. As a demonstrative example, a leaf‐shaped tin dioxide (SnO₂) anode is prepared through a templated layer‐by‐layer approach. The robust mechanical properties of the SnO₂ anode are demonstrated through density functional theory (DFT) in which principle stress caused by lithiation is calculated. Real‐time lithiation is observed using in situ transmission electron microscopy (TEM) technology. The presented anode shows a stable capacity of 760 mAh g⁻¹ after 200 cycles at 0.2 C, and a high capacity retention of 99% is achieved after three rounds of measurements.

中文翻译：

新型机械稳健的叶形二氧化锡锂离子电池阳极及其动态结构转化和电子转移模拟

当前的高能量密度二次电池电极有几个问题，主要是由于机械不稳定。本文介绍了一种新颖的，具有机械强度的阳极，该阳极由具有高锂存储性能的叶形结构组成。作为示例，通过模板化的逐层方法制备了叶形二氧化锡（SnO ₂）阳极。通过密度泛函理论（DFT）证明了SnO ₂阳极的强大机械性能，该理论计算了锂化引起的主应力。使用原位透射电子显微镜（TEM）技术可以观察到实时锂化。所示阳极显示出760 mAh g ^-1的稳定容量在0.2 C下进行200次循环后，经过三轮测量，可实现99％的高容量保持率。

更新日期：2020-01-20

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