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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Role of transition metal nanoparticles in the extra lithium storage capacity of transition metal oxides: a case study of hierarchical core-shell Fe3O4@C and Fe@C microspheres
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Role of transition metal nanoparticles in the extra lithium storage capacity of transition metal oxides: a case study of hierarchical core-shell Fe3O4@C and Fe@C microspheres

机译：过渡金属纳米粒子在过渡金属氧化物的额外锂存储容量中的作用：以分层的核壳型Fe3O4 @ C和Fe @ C微球为例

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摘要

The conversion reaction mechanism has widely been accepted in Interpreting and evaluating the lithium storage capability of transition metal oxides (MOs). However, this mechanism cannot well explain the phenomenon of the extra capacity which exists in almost all MO materials and attracts much attention. Up to now, the extra capacity phenomenon has generally been ascribed to the reversible conversion of polymeric gel-like films. However, the essential role of metal nanoparticles in this process has not been systematically investigated. To further illustrate the role of metal nanoparticles for the extra capacity, Fe3O4@C and Fe@C monodispersed hierarchical core-shell microspheres were designed and adopted as the case study. Naturally Fe3O4@C composites exhibited a large Li storage capacity beyond its theoretical value. However, Fe@C microspheres, which are usually regarded to be inert for lithium storage, still presented a certain electrochemical capacity. Fe nanoparticles might serve as electrocatalysts for the reversible conversion of some components of solid electrolyte interface films, and bring extra capacity to Fe3O4 and electrochemical capacity to Fe. This study can enlighten us for the exploiting of advanced active materials and electrolytes for Li ion batteries, and new energy storage devices.
机译：在解释和评估过渡金属氧化物（MOs）的锂储存能力中，转化反应机理已被广泛接受。但是，这种机理不能很好地解释几乎所有MO材料中都存在的多余容量现象，因此引起了广泛关注。迄今为止，通常将多余的容量现象归因于聚合物凝胶状薄膜的可逆转化。但是，尚未系统研究金属纳米粒子在此过程中的重要作用。为了进一步说明金属纳米粒子对额外容量的作用，设计了Fe3O4 @ C和Fe @ C单分散分层核-壳微球，并作为案例研究。自然地，Fe3O4 @ C复合材料的锂存储容量超出其理论值。但是，通常被认为对锂存储呈惰性的Fe @ C微球仍然具有一定的电化学容量。 Fe纳米粒子可以用作固体电解质界面膜某些组分可逆转化的电催化剂，并给Fe3O4和Fe带来额外的容量。这项研究可以为我们开发用于锂离子电池和新能源存储设备的先进活性材料和电解质提供启发。

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