Conductive Polypyrrole Coated Hollow NiCo2O4 Microspheres as Anode Material with Improved Pseudocapacitive Contribution and Enhanced Conductivity for Lithium‐Ion Batteries,ChemElectroChem

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Conductive Polypyrrole Coated Hollow NiCo2O4 Microspheres as Anode Material with Improved Pseudocapacitive Contribution and Enhanced Conductivity for Lithium‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-12-05 , DOI: 10.1002/celc.201801513
Yani Luo ₁ , Ruisong Guo ₁ , Tingting Li ₁ , Fuyun Li ₁ , Leichao Meng ₁ , Zhiwei Yang ₂ , Yizao Wan _{1,

2} , Honglin Luo _{1,

2}

Affiliation

Conductive polypyrrole (PPy) coated urchin‐like hollow NiCo₂O₄ (NCO) porous microspheres (NCO@PPy) were synthesized by an easy and cost‐effective method. The NCO@PPy shows improved cycling stability and rate capability in comparison with the pure NiCo₂O₄ when used as anode material for lithium‐ion batteries. In order to undersatnd the improvement of electrochemical performance of NCO@PPy, kinetic parameters and the lithium storage mechanism are investigated by EIS spectra and sweep voltammetry measurements. The sweep‐rate‐dependent CV (cyclic voltammetry) curves demonstrate an ever‐increasing redox capacitive‐controlled lithium storage originating from both, the hierarchical hollow structure and the effect of the PPy coating layer. The apparent Li⁺ ion diffusion coefficient of NCO@PPy and NCO derived from EIS and CV curves indicates that PPy coating layer reduces the charge‐transfer resistances and improves the lithium‐ion diffusion coefficient.

中文翻译：

导电聚吡咯涂层空心NiCo2O4微球作为阳极材料，具有改善的伪电容贡献和增强的锂离子电池电导率

导电聚吡咯（PPy）涂覆的顽童状空心NiCo ₂ O ₄（NCO）多孔微球（NCO @ PPy）是通过一种简单且经济高效的方法合成的。与纯NiCo ₂ O ₄相比，NCO @ PPy表现出改善的循环稳定性和倍率性能当用作锂离子电池的负极材料时。为了更好地了解NCO @ PPy的电化学性能，通过EIS谱和扫描伏安法研究了动力学参数和锂的储存机理。取决于扫描速率的CV（循环伏安法）曲线表明，由于分层空心结构和PPy涂层的影响，氧化还原电容控制的锂存储量不断增加。由EIS和CV曲线得出的NCO @ PPy和NCO的表观Li ⁺离子扩散系数表明PPy涂层降低了电荷转移电阻并改善了锂离子扩散系数。

更新日期：2018-12-05

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