Bifunctional Conducting Polymer Coated CoP Core–Shell Nanowires on Carbon Paper as a Free‐Standing Anode for Sodium Ion Batteries,Advanced Energy Materials

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Bifunctional Conducting Polymer Coated CoP Core–Shell Nanowires on Carbon Paper as a Free‐Standing Anode for Sodium Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-04-06 , DOI: 10.1002/aenm.201800283
Jing Zhang ₁ , Kai Zhang ₁ , Junghoon Yang ₁ , Gi-Hyeok Lee ₁ , Jeongyim Shin ₁ , Vincent Wing-hei Lau ₁ , Yong-Mook Kang ₁

Affiliation

This study proposes a conformal surface coating of conducting polymer for protecting 1D nanostructured electrode material, thereby enabling a free‐standing electrode without binder for sodium ion batteries. Here, polypyrrole (PPy), which is one of the representative conducting polymers, encapsulated cobalt phosphide (CoP) nanowires (NWs) grown on carbon paper (CP), finally realizes 1D core–shell CoP@PPy NWs/CP. The CoP core is connected to the PPy shell via strong chemical bonding, which can maintain a Co–PPy framework during charge/discharge. It also possesses bifunctional features that enhances the charge transfer and buffers the volume expansion. Consequently, 1D core–shell CoP@PPy NWs/CP demonstrates superb electrochemical performance, delivering a high areal capacity of 0.521 mA h cm⁻² at 0.15 mA cm⁻² after 100 cycles, and 0.443 mA h cm⁻² at 1.5 mA cm⁻² even after 1000 cycles. Even at a high current density of 3 mA cm⁻², a significant areal discharge capacity reaching 0.285 mA h cm⁻² is still maintained. The outstanding performance of the CoP@PPy NWs/CP free‐standing anode provides not only a novel insight into the modulated volume expansion of anode materials but also one of the most effective strategies for binder‐free and free‐standing electrodes with decent mechanical endurance for future secondary batteries.

中文翻译：

碳纸上的双功能导电聚合物涂层CoP核壳纳米线作为钠离子电池的独立阳极

这项研究提出了一种导电聚合物的保形表面涂层，用于保护一维纳米结构电极材料，从而使钠离子电池的无电极粘合剂成为自立式电极。在这里，作为典型导电聚合物之一的聚吡咯（PPy），是在复写纸（CP）上生长的封装的磷化钴（CoP）纳米线（NWs），最终实现了一维核壳CoP @ PPy NWs / CP。CoP内核通过牢固的化学键连接到PPy外壳，可以在充电/放电过程中保持Co-PPy框架。它还具有双功能特性，可增强电荷转移并缓冲体积膨胀。因此，一维核-壳型CoP @ PPy NWs / CP具有出色的电化学性能，在0.15 mA cm时可提供0.521 mA h cm ^-2的高面积容量^-2 100次循环，和0.443毫安高厘米后^-2在1.5毫安厘米^-2即使经1000次循环。即使在3mA cm ^-2的高电流密度下，仍然保持达到0.285mA h cm ^-2的显着的面放电容量。CoP @ PPy NWs / CP独立式阳极的出色性能不仅为阳极材料的调节体积膨胀提供了新颖的见解，而且还是具有良好机械耐久性的无粘合剂和独立式电极的最有效策略之一用于将来的二次电池。

更新日期：2018-04-06

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