Enhancing potassium-ion storage of Bi_(2)S_(3) through external–internal dual synergism: Ti_(3)C_(2)T_(x) compositing and Cu^(2+) doping  

作　　者：Dawei Sha Yurong You Rongxiang Hu Jianxiang Ding Xin Cao Yuan Zhang Long Pan ZhengMing Sun 

机构地区：[1]Key Laboratory of Advanced Metallic Materials of Jiangsu Province,School of Materials Science and Engineering,Southeast University,Nanjing,Jiangsu,China [2]Institute of Technology for Carbon Neutralization,College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou,Jiangsu,China [3]School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan,Anhui,China

出　　处：《Carbon Energy》2024年第9期39-51,共13页碳能源（英文）

基　　金：This work received financial support from the National Natural Science Foundation of China(Grant Nos.U23A20574,52250010,and 52201242);the 261 Project MIIT,the Young Elite Scientists Sponsorship Program by CAST(Grant No.2021QNRC001);the Fundamental Research Funds for the Central Universities(Grant No.2242022R40018);the Jiangsu Funding Program for Excellent Postdoctoral Talent(Grant No.2022ZB75).

摘　　要：Potassium-ion batteries(PIBs)offer a cost-effective and resource-abundant solution for large-scale energy storage.However,the progress of PIBs is impeded by the lack of high-capacity,long-life,and fast-kinetics anode electrode materials.Here,we propose a dual synergic optimization strategy to enhance the K^(+)storage stability and reaction kinetics of Bi_(2)S_(3) through two-dimensional compositing and cation doping.Externally,Bi_(2)S_(3) nanoparticles are loaded onto the surface of three-dimensional interconnected Ti_(3)C_(2)T_(x) nanosheets to stabilize the electrode structure.Internally,Cu^(2+)doping acts as active sites to accelerate K^(+)storage kinetics.Various theoretical simulations and ex situ techniques are used to elucidate the external–internal dual synergism.During discharge,Ti_(3)C_(2)T_(x) and Cu^(2+)collaboratively facilitate K+intercalation.Subsequently,Cu^(2+)doping primarily promotes the fracture of Bi2S3 bonds,facilitating a conversion reaction.Throughout cycling,the Ti_(3)C_(2)T_(x) composite structure and Cu^(2+)doping sustain functionality.The resulting Cu^(2+)-doped Bi2S3 anchored on Ti_(3)C_(2)T_(x)(C-BT)shows excellent rate capability(600 mAh g^(-1) at 0.1 A g^(–1);105 mAh g^(-1) at 5.0 A g^(-1))and cycling performance(91 mAh g^(-1) at 5.0 A g^(-1) after 1000 cycles)in half cells and a high energy density(179 Wh kg–1)in full cells.

关 键 词：Bi_(2)S_(3) cation doping potassium-ion batteries synergic mechanism Ti_(3)C_(2)T_(x)compositing 

分 类 号：TM912[电气工程—电力电子与电力传动]