Abstract
Bismuth-based anode materials have been regarded as promising Li-ion batteries due to their high theoretical capacity.However,their low conductivity and associated volume expansion inhabited their commercial-ization.In this work,Bi2O2CO3@C composites were suc-cessfully synthesized by in situ anchoring of flower-like Bi2O2CO3 nanosheets on a carbon-based substrate via hydrothermal.The unique composited structure of Bi2O2-CO3@C leads to a stable specific capacity of 547 mAh·g-1 after 100 cycles at a current density of 0.1 A·g-1.Notably,it demonstrates excellent rate capability with a specific capacity of 210 mAh·g-1 at 5 A·g-1.After 550 cycles at a current density of 0.5 A·g-1,a high reversible capacity of nearly 400 mAh·g-1 was observed.Additionally,in situ X-ray diffraction measurements clearly demonstrate the conversion between Bi and Li3Bi during alloying/dealloy-ing,confirming the good electrochemical reversibility of the materials for Li storage.The reaction kinetics of Bi2O2CO3@C were further investigated using galvanos-tatic intermittent titration technique.Furthermore,Bi2O2-CO3@C exhibited excellent long-term stability,maintaining its high reversible capacity for over 200 cycles at a current density of 0.5 A·g-1 in a full cell configuration using Li1.20Mn0.54Ni0.13Co0.13O2 as the cathode material.This result further underscores its promising potential for lithium-ion batteries.This work may provide inspiration for the design of alloy-type negative electrode materials for high-performance rechargeable batteries.
基金项目
Yunnan Fundamental Research Projects(202401AU070164)
Yunnan Fundamental Research Projects(202101AU070157)
National Natural Science Foundation of China(52064028)
Yunnan Provincial Major Science and Technology Special Plan Projects(202202AF080002)
万方数据