A N-CoSe/CoSe_(2)-C@Cu hierarchical architecture as a current collector-integrated anode for potassium-ion batteries  

作　　者：Zi-Jie Mu Yan-Jun Gao Wen-Shuai Dong Zong-You Li Qing-Yi Song Han-Jiao Huang Li-Dong Xing Jian-Guo Zhang Wei Wang Qi-Yao Yu 

机构地区：[1]State Key Laboratory of Explosion Science and Technology,School of Mechatronical Engineering,Beijing Institute of Technology,Beijing 100081,China [2]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Rare Metals》2024年第8期3702-3712,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.52371131);Beijing Nova Program (No.Z211100002121082);the Interdisciplinary Research Project for Young Teachers of University of Science and Technology Beijing (No.FRF-IDRY-21-013);the Project of State Key Laboratory of Explosion Science and Technology (No.QNKT23-05);Xiaomi Young Scholar Program。

摘　　要：The highly reversible insertion/extraction of large-radius K^+into electrode materials remains a tough goal,especially for con version-type materials.Herein,we design a current collector-integrated electrode(N-CoSe/CoSe_(2)-C@Cu) as an advanced anode for potassium-ion battery(PIBs).The conductive CoSe/CoSe_(2) heterojunction with rich Se vacancy defects,conductive sp^2 N-doped carbon layer,and the elastic copper foil matrix can greatly accelerate the electron transfer and enhance the structural stability.Consequently,the well-designed N-CoSe/CoSe_(2)-C@Cu current collector-integrated electrode displays enhanced potassium storage performance with regard to a high capacity(325.1 mAh·g^(-1) at 0.1 A·g^(-1) after 200cycles),an exceptional rate capability(223.5 mAh·g^(-1) at2000 mA·g^(-1)),and an extraordinary long-term cycle stability(a capacity fading of only 0.019% per cycle over1200 cycles at 2000 mA·g^(-1)).Impressively,ex situ scanning electron microscopy(SEM) characterizations prove that the elastic structure of copper foil is merged into the cleverly designed N-CoSe/CoSe_(2)-C@Cu heterostructure,which buffers the deformation of structure and volume and greatly promotes the cycle life during the potassium/depotassium process.

关 键 词：Potassium-ion battery Integrated collector electrode CoSe CoSe_2 HETEROJUNCTION Copper foil matrix N-doped carbon 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]