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文章编号：1672-6987（2026）02-0065-07；DOI：10. 16351/j. 1672-6987. 2026. 02. 010
李 涌，高裕跃，毛常明，刘 静* （青岛科技大学 材料科学与工程学院，山东 青岛 266042）
摘 要：FeTe2由于具有相对较高的理论容量而成为二次电池负极材料的潜在候选，但其在锂 离子电池中的应用尚未见报道。考虑到过渡金属化合物普遍存在的循环过程中体积剧烈膨 胀和收缩而带来的容量大幅度衰减的问题，本研究设计合成了类胶囊结构的含缺陷 FeTe2@C 复合材料，并研究了其储锂性能。结果显示，制备的 FeTe2粒子均匀而紧密地填充于具有双锥 六角棱柱形貌的碳管中，这种类胶囊的填充结构既有利于防止 FeTe2材料体积膨胀/收缩引起 的活性物质脱落，又可有效提高 FeTe2负极的电导率。而且 FeTe2材料中存在少量的 Te 缺陷 有利于锂离子的传导，改善了材料的电极动力学。在 1. 0 A · g−1 的电流密度下，该材料的首 次可逆容量为 852 mAh · g−1 ，300 次循环后仍能保持 732 mAh · g−1 ，容量保持率高达 86%，显 示了其在锂离子电池中良好的稳定性。
关键词：FeTe2@C 复合材料； Te 缺陷；类胶囊结构；锂离子电池
中图分类号：TB 33 文献标志码：A
引用格式：李涌，高裕跃，毛常明，等 . 类胶囊结构的含缺陷 FeTe2@C 复合材料的制备及其 储锂性能［J］. 青岛科技大学学报（自然科学版），2026，47（2）：65-71.
LI Yong， GAO Yuyue， MAO Changming， et al. Design of a capsule-like FeTe2@C composite with Te defect and its application in Li-ion batteries［J］. Journal of Qingdao University of Science and Technology（Natural Science Edition），2026，47（2）：65-71.
Design of a Capsule-Like FeTe2@C Composite with Te Defect and Its Application in Li-Ion Batteries
LI Yong，GAO Yuyue，MAO Changming，LIU Jing （College of Materials Science and Engineering， Qingdao University of Science and Technology， Qingdao 266042， China）
Abstract：Due to a relatively high theoretical capacity， FeTe2 has become a potential candidate for anode materials of secondary batteries， but its application in Li-ion batteries has not been reported. Considering the general problem that the capacity of transition metal compounds greatly reduces due to the drastic expansion and shrink of the volume during cycling process， we designed a capsule-like FeTe2@C composite with Te defects， and the lithium storage property of the composite was studied. TEM images showed that FeTe2 particles were uniformly and tightly filled in carbon tubes with biconical hexagonal prism morphology. The capsule-like filling structure not only prevented the FeTe2 from falling off after repeatedly expansion/shrink， but also effectively improved the conductivity of FeTe2 anode. XPS spectra showed that there were a small amount of Te defects in the FeTe2@C composite， which would provide more active sites for the transport of Li ions， so the electrode dynamics was improved. At a current density of 1. 0 A · g−1 ， the initial reversible capacity of the FeTe2@C composite was 852 mAh · g−1 . After 300 cycles， the reversible capacity could still maintain 732 mAh · g−1 ， and the capacity retention rate was as high as 86%. So the prepared FeTe2@C composite shows an excellent cycling stability in Li-ion battery.
Key words：FeTe2@C composite； Te defects； capsule-like structure； Li-ion battery、
收稿日期：2025-06-22
基金项目：国家自然科学基金项目（51972187）.
作者简介：李 涌（1999—），男，硕士研究生 . * 通信联系人 .
