Li Jili, Lin Haiyan, Tang Chunjuan, Yu Dongsheng, Sun Jie, Zhang Wanzhen, Wang Yujiang
Material Science and Engineering School, Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium based Battery & Henan Key Laboratory of Special Protective Materials, Luoyang Institute of Science and Technology, Luoyang 471023, People's Republic of China.
Nanotechnology. 2021 Nov 18;33(6). doi: 10.1088/1361-6528/ac353c.
Lithium-rich layered manganese-based cathodes (LRLMOs) with first-class energy density (∼1000 W h kg) have attracted wide attention. Nevertheless, the weak cycle stability and bad rate capability obstruct their large-scale commercial application. Here, single crystal LiNaNiMnO( = 0, 0.05, 0.1, 0.15) nanoparticles are designed and successfully synthesized due to the single crystal structure with smaller internal stress and larger ionic radius of Na. The synergistic advantages of single crystal structure and Na doping are authenticated as cathodes for Li ion batteries (LIBs), which can consolidate the crystallographic structure and be benefit for migration of lithium ion. Among all the Na doping single crystals, LiNaNiMnOcathode possesses supreme cycling life and discharge capacity at large current density. To be more specific, it exhibits a discharge capacity of 264.2 mAh gafter 50 charge and discharge cycles, higher than that of undoped material (214.9 mAh g). The discharge capacity of LiNaNiMnOcathode at 10 C (1 C = 200 mA g) is enhanced to 160.4 mAh g(106.7 mAh gfor = 0 sample). The creative strategy of Na doping single crystal LRLMOs might furnish an idea to create cathode materials with high energy and power density for next generation LIBs.
具有一流能量密度（约1000瓦时/千克）的富锂层状锰基阴极（LRLMOs）已引起广泛关注。然而，其较差的循环稳定性和倍率性能阻碍了它们的大规模商业应用。在此，由于具有较小内应力和较大Na离子半径的单晶结构，设计并成功合成了单晶LiNaNiMnO（x = 0、0.05、0.1、0.15）纳米颗粒。单晶结构和Na掺杂的协同优势被证实可作为锂离子电池（LIBs）的阴极，这可以巩固晶体结构并有利于锂离子迁移。在所有Na掺杂的单晶中，LiNaNiMnO阴极在大电流密度下具有卓越的循环寿命和放电容量。更具体地说，在50次充放电循环后，它表现出264.2毫安时/克的放电容量，高于未掺杂材料（214.9毫安时/克）。LiNaNiMnO阴极在10C（1C = 200毫安/克）下的放电容量提高到160.4毫安时/克（x = 0的样品为106.7毫安时/克）。Na掺杂单晶LRLMOs的创新策略可能为下一代LIBs创造具有高能量和功率密度的阴极材料提供思路。
