In Situ Construction of Heterostructured Co3O4/CoP Nanoflake Arrays on Carbon Cloth as Binder-Free Anode for High-Performance Lithium-Ion Batteries
In Situ Construction of Heterostructured Co3O4/CoP Nanoflake Arrays on Carbon Cloth as Binder-Free Anode for High-Performance Lithium-Ion Batteries
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DOI：
10.1021/acsami.3c02455
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发表时间：
2023-05-05
影响因子：
9.5
通讯作者：
Li，Qiulong
中科院分区：
文献类型：
--
作者：
Zhao，Chunyan;Zhang，Lingsheng;Li，Qiulong
钴氧化物(Co3O4)因其对环境友好和优异的理论容量被认为是锂离子电池(LIB)的负极材料，具有很大的研究价值。然而，锂离子电池的本征电导率较低，电化学动力学较差，循环性能较差，严重限制了其在锂离子电池中的实际应用。引入高导电性的钴基化合物构建具有异质结构的自立式电极是解决上述问题的有效策略。本论文采用原位磷化法制备了Co3O4/CoP异质结构纳米片阵列(NFA)。密度泛函理论模拟结果表明，异质结构的构建大大提高了电子电导率和锂离子的吸附能。Co3O4/CoPNFAs/CC具有优异的容量(1490.7 mA h g-lat 0.1Ag-L)、高电流密度性能(769.1 mA h g-lat 2.0A g-L)和显著的循环稳定性(300次循环451.3 mA h g-llt，容量保持率为58.7%)。合理的异质结构结构可以促进界面离子的传输，显著提高锂离子的吸附能，改善Co3O4电极材料的导电性，促进充放电循环中的局部电荷转移，提高材料的整体电化学性能。
Cobalt oxide (Co3O4) is regarded as the anode material for lithium-ion batteries (LIBs) with great research value owing to its environmental friendliness and exceptional theoretical capacity. However, the low intrinsic conductivity, poor electrochemical kinetics, and unsatisfactory cycling performance severely limit its practical applications in LIBs. The construction of a self-standing electrode with heterostructure by introducing a highly conductive cobalt-based compound is an effective strategy to solve the above issues. Herein, Co3O4/CoP nanoflake arrays (NFAs) with heterostructure are constructed skillfully directly grown on carbon cloth (CC) by in situ phosphorization as an anode for LIBs. Density functional theory simulation results demonstrate that the construction of heterostructure greatly increases the electronic conductivity and Li ion adsorption energy. The Co3O4/CoP NFAs/CC exhibited an extraordinary capacity (1490.7 mA h g-lat 0.1 A g-l) and excellent performance at high current density (769.1 mA h g-lat 2.0 A g-l), as well as remarkable cyclic stability (451.3 mA h g-lafter 300 cycles with a 58.7% capacity retention rate). The reasonable construction of heterostructure can promote the interfacial ion transport, significantly enhance the adsorption energy of lithium ions, improve the conductivity of Co3O4electrode material, promote the partial charge transfer throughout the charge and discharge cycles, and enhance the overall electrochemical performance of the material.