基于CoFe2O4@C锂空气电池正极催化剂的研究

doi:10.11962/1006-4990.2020-0347

摘要/Abstract

摘要：

锂空气电池因其具有超高的能量密度从而引起了研究者们的广泛关注,但其研究处于初级阶段。其中找到合适的锂空气电池正极催化剂是目前研究的主要方向之一。通过溶胶-凝胶联合原位水热合成法成功实现了适用于锂空气电池正极的催化剂铁酸钴@科琴黑（CFO@KB）复合材料的制备。通过调整铁酸钴与科琴黑的质量比（1∶1、3∶1、5∶1、7∶1）,得到不同性能的CFO@KB复合物,并利用XRD表征其结构,发现本研究合成的铁酸钴为尖晶石型,且CFO@KB复合物仍然呈现其特征峰。当容量限制在180 mA·h/g（以电极材料计）、铁酸钴与科琴黑质量比为1∶1时,其复合物在锂空气电池中呈现出最好的限容循环稳定性和较高的放电截止电压。其充电电压和放电电压之间的电压差为0.2 V,小于现有相关文献中报道的值。

关键词: 正极催化剂, 锂空气电池, 限容循环, 截止电压

Abstract:

Li-air battery has attracted extensive attention due to its ultra-high energy density,but its research is in the pri-mary stage.One of the main aspects of current research is to find a suitable cathode catalyst for Li-air battery.The CoFe₂O₄@Ketjenblack（CFO@KB） materials as cathode catalyst for Li-air battery were successfully synthesized by sol-gel combined with in-situ hydrothermal synthesis method.By adjusting the mass ratio of CoFe₂O₄ to Ketjenblack（1∶1,3∶1,5∶1 and 7∶1）,CFO@KBcomposites with different properties were obtained.Structure of the composites was characterized by XRD.It was found that the synthesized CoFe₂O₄ in the study was spinel type,and CFO@KB composites still presented its characteristic peak.When the capacity was limited to 180 mA·h/g（based on electrode materials） and the mass ratio of CoFe₂O₄ to Ketjenblack was1∶1,the composites exhibited the best capacity limiting cycle stability and high cut-off voltage.The voltage difference between charging voltage and discharging voltage was 0.2 V,which was less than the reported value in the existing literature.

Key words: cathode catalyst, lithium-air battery, limited-capacity cycling, cut-off voltage

中图分类号:

TQ138.12

王相君,高利,许蕾,池永庆. 基于CoFe₂O₄@C锂空气电池正极催化剂的研究[J]. 无机盐工业, 2021, 53(5): 96-99.

Wang Xiangjun,Gao Li,Xu Lei,Chi Yongqing. Study on CoFe₂O₄@C as cathode catalyst of Li-air battery[J]. Inorganic Chemicals Industry, 2021, 53(5): 96-99.

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基于CoFe₂O₄@C锂空气电池正极催化剂的研究

Study on CoFe₂O₄@C as cathode catalyst of Li-air battery

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