Stable cycling of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)/lithium metal batteries enabled by synergistic tuning the surface stability of cathode/anode
作者机构:School of Materials Science&EngineeringBeijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China Shenzhen BTR New Energy Technology Institute Co.LtdShenzhen 518118GuangdongChina
出 版 物:《Journal of Energy Chemistry》 (能源化学(英文版))
年 卷 期:2023年第87卷第12期
页 面:342-350,I0009页
核心收录:
基 金:supported by the National Natural Science Foundation of China(22209012,52072036) the fellowship of China Postdoctoral Science Foundation(2020M680374)
主 题:Ni-rich layered oxides Surface fluorinated reconstruction Interfacial stability TOF-SIMS Cross-talk effect
摘 要:Ni-rich layered oxides(LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2))show great potential in long-range and low-cost lithiumion ***,due to the high surface sensitivity,their practical application is hindered by interfacial instability with electrolytes under high voltage for long cyclic ***,by combining both firstprinciple calculations and time-of-flight secondary ion mass spectrometry(TOF-SIMS),a novel surface fluorinated reconstruction(SFR)mechanism is proposed to improve the interfacial stability under high voltage,which could effectively regulate the surface fluoride species to desensitize the LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)*** demonstrate here that by tuning the ratio of fluoride species,the LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)/Li battery could achieve excellent long-term and high voltage performance(163.5 mA h g^(-1)at 0.5 C for 300 cycles under 4.4 V),while the controlled sample decayed to 125.4 mA h g^(-1)after 300 ***,the favorable cross-talk effect induced by SFR further facilitates the incorporation of suitable amounts of Ni ions into the construction of stable solid electrolyte interface(SEI)layer for anode ***,the ultra-long cycling stability under high voltage can be achieved by the robust cathode/electrolyte and Li/electrolyte interfaces,which results in excellent interfacial stability after long *** work provides new insights into the surface design of cathode materials and improves the stability of the electrode-electrode interface under high voltage.