A N-CoSe/CoSe2-C@Cu hierarchical architecture as a current collector-integrated anode for potassium-ion batteries

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外文摘要：The highly reversible insertion/extraction of large-radius K+into electrode materials remains a tough goal,especially for conversion-type materials.Herein,we design a current collector-integrated electrode(N-CoSe/CoSe2-C@Cu)as an advanced anode for potassium-ion battery(PIBs).The conductive CoSe/CoSe2 heterojunction with rich Se vacancy defects,conductive sp2 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/CoSe2-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 200 cycles),an exceptional rate capability(223.5 mAh·g-1 at 2000 mA·g-1),and an extraordinary long-term cycle sta-bility(a capacity fading of only 0.019％per cycle over 1200 cycles at 2000 mA·g-1).Impressively,ex situ scan-ning electron microscopy(SEM)characterizations prove that the elastic structure of copper foil is merged into the cleverly designed N-CoSe/CoSe2-C@Cu heterostructure,which buffers the deformation of structure and volume and greatly promotes the cycle life during the potassium/de-potassium process.

外文关键词：

Potassium-ion batteryIntegrated collector electrodeCoSeCoSe2HeterojunctionCopper foil matrixN-doped carbon

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

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作者单位：

State Key Laboratory of Explosion Science and Technology,School of Mechatronical Engineering,Beijing Institute of Technology,Beijing 100081,China

School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China

基金：

National Natural Science Foundation of ChinaBeijing Nova ProgramInterdisciplinary Research Project for Young Teachers of University of Science and Technology BeijingProject of State Key Laboratory of Explosion Science and TechnologyXiaomi Young Scholar Program

项目编号：

52371131Z211100002121082FRF-IDRY-21-013QNKT23-05

出版年：

2024

DOI：

10.1007/s12598-024-02788-5

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDEI

影响因子：0.801

ISSN：1001-0521

年,卷(期)：2024.43(8)