In Situ Growth of CoP Nanosheet Arrays on Carbon Cloth as Binder-Free Electrode for High-Performance Flexible Lithium-Ion Batteries,Small

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In Situ Growth of CoP Nanosheet Arrays on Carbon Cloth as Binder-Free Electrode for High-Performance Flexible Lithium-Ion Batteries
Small ( IF 13.0 ) Pub Date : 2022-11-02 , DOI: 10.1002/smll.202204970
Yang Yang ₁ , Jun Xia ₁ , Xianggang Guan ₁ , Ziwei Wei ₁ , Jiayu Yu ₁ , Shichao Zhang ₁ , Yalan Xing ₁ , Puheng Yang _{1,

2}

Affiliation

Cobalt phosphide (CoP) is considered as one of the most promising candidates for anode in lithium-ion batteries (LIBs) owing to its low-cost, abundant availability, and high theoretical capacity. However, problems of low conductivity, heavy aggregation, and volume change of CoP, hinder its practical applicability. In this study, a binder-free electrode is successfully prepared by growing CoP nanosheets arrays directly on a carbon cloth (CC) via a facile one-step electrodeposition followed by an in situ phosphorization strategy. The CoP@CC anode exhibits good interfacial bonding between the CoP and CC, which can improve the conductivity of the integrated electrode. More importantly, the 3D network structure composed of CoP nanosheets and CC provides sufficient space to alleviate the volume expansion of CoP and shorten the electron/ion transport paths. Moreover, the support of CC effectively prevents the agglomeration of CoP. Based on these advantages, when CoP@CC is paired with the NCM523 cathode, the full cell delivers a high discharge capacity 919.6 mAh g⁻¹ (2.1 mAh cm⁻²) after 200 cycles at 0.5 A g⁻¹. The feasibility and safety of producing pouch cells are also explored, which show good flexibility and safety despite rigorous strikes (mechanical damage and severe deformations), implying a great potential for practical applications.

中文翻译：

在碳布上原位生长 CoP 纳米片阵列作为高性能柔性锂离子电池的无粘合剂电极

磷化钴 (CoP) 因其低成本、丰富的可用性和高理论容量而被认为是锂离子电池 (LIB) 中最有前途的负极候选者之一。然而，CoP的低电导率、重聚集和体积变化等问题阻碍了其实际应用。在这项研究中，通过简单的一步电沉积和原位磷化策略直接在碳布 (CC) 上生长 CoP 纳米片阵列，成功制备了无粘合剂电极。CoP@CC负极在CoP和CC之间表现出良好的界面结合，可以提高集成电极的电导率。更重要的是，CoP纳米片和CC组成的3D网络结构提供了足够的空间来缓解CoP的体积膨胀并缩短电子/离子传输路径。此外，CC 的支持有效地防止了 CoP 的聚集。基于这些优势，当CoP@CC与NCM523正极配对时，全电池可提供919.6 mAh g的高放电容量^-1 (2.1 mAh cm ^-2 ) 在 0.5 A g ^-1下 200 个循环后。还探讨了生产软包电池的可行性和安全性，尽管受到严格的打击（机械损坏和严重变形），但仍显示出良好的柔韧性和安全性，具有巨大的实际应用潜力。

更新日期：2022-11-02

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