An Amorphous/Crystalline Incorporated Si/SiOx Anode Material Derived from Biomass Corn Leaves for Lithium-Ion Batteries
An Amorphous/Crystalline Incorporated Si/SiOx Anode Material Derived from Biomass Corn Leaves for Lithium-Ion Batteries
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用于锂离子电池的源自生物质玉米叶的非晶/晶体掺入 Si/SiOx 负极材料
DOI：
10.1002/smll.202001714
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发表时间：
2020
期刊：
影响因子：
13.3
通讯作者：
Wei Yingjin
中科院分区：
文献类型：
--
作者：
Su Anyu;Li Jian;Dong Jiajun;Yang Di;Chen Gang;Wei Yingjin
从含硅量高的植物中生产硅（Si）阳极材料，可以有效利用农副产品。然而，合成的Si材料的电化学性能仍然需要改进，因此需要进一步的结构设计和形貌修饰，这不可避免地增加了制备时间和经济成本。在这里，玉米叶转化为硅阳极材料的报道，通过一个简单的铝热还原反应，没有其他修改。所获得的Si材料继承了天然玉米叶模板的结构特征，并具有许多固有的优点，如高孔隙率、无定形/结晶混合结构和高价态SiO2残留，显著增强了材料的结构稳定性和电极附着强度，从而获得上级电化学性能。倍率性能测试表明，该材料在8 A g− 1电流密度下可提供1200 mA h g− 1的高容量。在0.5 A g−1下循环300次后，该材料保持2100 mA h g−1的高比容量，在长期循环过程中保持近100%的容量。本研究为锂离子电池硅负极材料的工业化生产提供了一条经济的途径。
The fabrication of silicon (Si) anode materials derived from high silica‐containing plants enables effective utilization of subsidiary agricultural products. However, the electrochemical performances of synthesized Si materials still require improvement and thus need further structural design and morphology modifications, which inevitably increase preparation time and economic cost. Here, the conversion of corn leaves into Si anode materials is reported via a simple aluminothermic reduction reaction without other modifications. The obtained Si material inherits the structural characteristics of the natural corn leaf template and has many inherent advantages, such as high porosity, amorphous/crystalline mixture structure, and high‐valence SiOxresiduals, which significantly enhance the material's structural stability and electrode adhesive strength, resulting in superior electrochemical performances. Rate capability tests show that the material delivers a high capacity of 1200 mA h g−1at 8 A g−1current density. After 300 cycles at 0.5 A g−1, the material maintains a high specific capacity of 2100 mA h g−1, with nearly 100% capacity retention during long‐term cycling. This study provides an economical route for the industrial production of Si anode materials for Lithium‐Ion batteries.