Key Laboratory of Colloid&Interface Chemistry Ministry of Education and School of Chemistry and Chemical Engineering Shandong University Jinan 250100 ChinaInternational Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology(Ministry of Education) Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 China;
Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell Technology Liaocheng University Liaocheng 252059 China;
Key Laboratory of Colloid&Interface Chemistry Ministry of Education and School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China;
Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell Technology Liaocheng University Liaocheng 252059 China;
Key Laboratory of Colloid&Interface Chemistry Ministry of Education and School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China;
School of Physics Shandong University Jinan 250100 China;
Key Laboratory of Colloid&Interface Chemistry Ministry of Education and School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China;
Key Laboratory of Colloid&Interface Chemistry Ministry of Education and School of Chemistry and Chemical Engineering Shandong University Jinan 250100 ChinaShandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell Technology Liaocheng University Liaocheng 252059 China;
core-shell; pseudocapacitance; in-situ X-ray diffraction(XRD); first principle calculations; potassium-ion batteries;