首页|Modulating Co-Co bonds average length in Cc0.85Se1-xSx to enhance conversion reaction for potassium storage

Modulating Co-Co bonds average length in Cc0.85Se1-xSx to enhance conversion reaction for potassium storage

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While alloying transition metal chalcogenides(TMCs)with other chalcogen elements can effectively improve their conductivity and electrochemical properties,the optimal alloying content is still uncertain.In this study,we study the influence of dopant concentration on the chemical bonds in TMC and reveal the associated stepwise conversion reaction mechanism for potassium ion storage.According to density function theory calculations,appropriate S-doping in Co0.85Se(Co0.85Se1-xSx)can reduce the average length of Co-Co bonds because of the electronegativity variation,which is thermodynamically favour-able to the phase transition reactions.The optimal Se/S ratio(x=0.12)for the conductivity has been obtained from experimental results.When assembled as an anode in potassium-ion batteries(PIBs),the sample with optimized Se/S ratio exhibits extraordinary electrochemical performance.The rate per-formance(229.2 mA h g-1 at 10 A g-1)is superior to the state-of-the-art results.When assembled with Prussian blue(PB)as a cathode,the pouch cell exhibits excellent performance,demonstrating its great potential for applications.Moreover,the stepwise K+storage mechanism caused by the coexistence of S and Se is revealed by in-situ X-ray diffraction and ex-situ transmission electron microscopy techniques.Hence,this work not only provides an effective strategy to enhance the electrochemical performance of transition metal chalcogenides but also reveals the underlying mechanism for the construction of advanced electrode materials.

Co0.85Se1-xSxCo-Co bondsPhase transition reactionsOptimal Se/SPotassium ion batteries

Daming Chen、Yuchun Liu、Pan Feng、Xiao Tao、Zhiquan Huang、Xiyu Zhang、Min Zhou、Jian Chen

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Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,Jiangsu,China

Hefei National Laboratory for Physical Sciences at the Microscale,School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,Anhui,China

江苏省自然科学基金Jiangsu Provincial Department of Science and Technology Innovation Support ProgramJiangsu Provincial Department of Science and Technology Innovation Support Program国家自然科学基金国家自然科学基金中央高校基本科研业务费专项

BK20211172BK20222004BZ20220365200236622075263WK2060000039

2024

10.1016/j.jechem.2023.12.013

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.91(4)
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