Abstract
The morphological and structural optimizations of electrode materials are efficient ways to enhance their electrochemical performance. Herein, we report a facile co-precipitation and subsequent calcination method to fabricate Li1.2Mn0.54Ni0.13Co0.13O2 nanosheets consisting of interconnected primary nanoparticles and open holes through the full thickness. By comparing the nanosheets and the agglomerated nanoparticles, the effects of the morphology and structure on the electrochemical performance are investigated. Specifically, the nanosheets exhibit a discharge capacity of 210 mA h g−1 at 0.5C with a capacity retention of 85% after 100 cycles. The improved electrochemical performance could be attributed to their morphological and structural improvements, which may facilitate sufficient electrolyte contacts, short diffusion paths and good structural integrity during the charge/discharge process. This work provides a feasible approach to fabricate lithium-rich layered oxide cathode materials with 2D morphology and porous structure, and reveals the relationships between their morphology, structure and electrochemical performance.
Highlights
Rechargeable lithium-ion batteries have been widely used in portable consumer electronics, electric vehicles and large-scale energy storage.[1,2] their further development has been limited mainly by the low energy densities of cathode materials.[3]
Lithium-rich layered oxide cathode materials with the general formula xLi2MnO3$(1 À x)LiMO2 (0 < x < 1; M 1⁄4 Mn, Ni or/ and Co) are regarded as promising candidates for high-energy lithium-ion batteries owing to their large theoretical speci c capacity (>250 mA h gÀ1) and high discharge voltage (>3.5 V vs. Li/Li+).[4,5]
It has been well acknowledged that the electrochemical properties of lithium-rich layered oxide cathode materials tightly depend on their morphologies and structures.[9,10,11,12]
Summary
Rechargeable lithium-ion batteries have been widely used in portable consumer electronics, electric vehicles and large-scale energy storage.[1,2] their further development has been limited mainly by the low energy densities of cathode materials.[3]. Lithium-rich layered oxide cathode materials with the general formula xLi2MnO3$(1 À x)LiMO2 (0 < x < 1; M 1⁄4 Mn, Ni or/ and Co) are regarded as promising candidates for high-energy lithium-ion batteries owing to their large theoretical speci c capacity (>250 mA h gÀ1) and high discharge voltage (>3.5 V vs Li/Li+).[4,5] lithium-rich layered oxide cathode materials still have great challenges in their large-scale commercial applications, such as relatively poor rate capability, unsatisfactory cycling stability and severe voltage decay on cycling.[6,7,8] These reports demonstrate that lithium-rich layered oxide cathode materials with 1D, 3D and complex hierarchical structures have been commonly fabricated in recent years. The relationships among their morphology, structure and electrochemical performance have been further investigated
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