Phase-transition-free rivets for layered oxide potassium cathodes  

作　　者：Jie Chen Apparao M. Rao Caitian Gao Jiang Zhou Limei Cha Xiaoming Yuan Bingan Lu 

机构地区：[1]School of Physics and Electronics, Hunan University, Changsha, 410082, China [2]Department of Physics and Astronomy, Clemson Nanomaterials Institute, Clemson University, Clemson, SC, USA [3]School of Materials Science and Engineering, Central South University, Changsha, 410083, China [4]Materials Science and Engineering program, Guangdong Technion-Israel Institute of Technology, Shantou, 515063, China [5]Materials Science and Engineering program, Technion-Israel Institute of Technology, Haifa, 32000, Israel [6]MATEC Key Lab, Guangdong Technion-Israel Institute of Technology, Shantou, 515063, China [7]Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, 410078, China

出　　处：《Nano Research》2024年第11期9671-9678,共8页纳米研究（英文版）

基　　金：financially supported by two grants from the National Natural Science Foundation of China(Nos.U20A20247 and 51922038 to B.L.);The National Key Research and Development Program of Ministry of Science and Technology(No.2022YFA1402504);Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion(No.MATEC2023KF002);Guangdong Science and Technology Department(No.STKJ2021016);A.M.R acknowledges financial support through the Robert A.Bowen Endowed Professorship funds at Clemson University.

摘　　要：As a cathode material for potassium-ion batteries (PIBs), manganese-based layered oxides have attracted widespread attention due to their low cost, ease of synthesis, and high performance. However, the Jahn-Teller effect caused by Mn3+ and the irreversible phase transformation of the structure leads to poor cycle stability, limiting the development of layered oxides in PIBs. Herein, we demonstrate the use of phase-transition-free CaTiO_(3) as rivets in K_(0.5)Mn_(0.9)Ti_(0.1)O_(2) by a simple solid-state method. As verified by the in situ X-ray diffraction, the CaTiO_(3) rivets effectively prevent the slippage of the transition metal layer during charge and discharge, inhibiting structural degradation. As a result, the obtained K_(0.5)Mn_(0.9)Ti_(0.1)O_(2)-0.02CaTiO_(3) shows excellent cycling stability and rate performance, with high capacities of 119.3 and 70.1 mAh·g^(-1) at 20 and 1000 mA·g^(-1), respectively. At 200 mA·g^(-1), the capacity retention remains 94.7% after more than 300 cycles. This work represents a new avenue for designing and optimizing layered cathode materials for PIBs and other batteries.

关 键 词：potassium cathodes layered oxide phase-transition-free PEROVSKITE rivets 

分 类 号：O44[理学—电磁学]