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DOI	10.1039/c8ee00309b
	Empowering multicomponent cathode materials for sodium ion batteries by exploring three-dimensional compositional heterogeneities
	Rahman M.M.; Xu Y.; Cheng H.; Shi Q.; Kou R.; Mu L.; Liu Q.; Xia S.; Xiao X.; Sun C.-J.; Sokaras D.; Nordlund D.; Zheng J.-C.; Liu Y.; Lin F.
发表日期	2018
ISSN	17545692
起始页码	2496
结束页码	2508
卷号	11 期号:9
英文摘要	Affordable sodium ion batteries hold great promise for revolutionizing stationary energy storage technologies. Sodium layered cathode materials are usually multicomponent transition metal (TM) oxides and each TM plays a unique role in the operating cathode chemistry, e.g., redox activity, structural stabilization. Engineering the three-dimensional (3D) distribution of TM cations in individual cathode particles can take advantage of a depth-dependent charging mechanism and enable a path towards tuning local TM-O chemical environments and building resilience against cathode-electrolyte interfacial reactions that are responsible for capacity fading, voltage decay and safety hazards. In this study, we create 3D compositional heterogeneity in a ternary and biphasic (O3-P3) sodium layered cathode material (Na0.9Cu0.2Fe0.28Mn0.52O2). The cells containing this material deliver stable voltage profiles, and discharge capacities of 125 mA h g-1 at C/10 with almost no capacity fading after 100 cycles and 75 mA h g-1 at 1C with negligible capacity fading after 200 cycles. The direct performance comparison shows that this material outperforms other materials with similar global compositions but different mesoscale chemical distributions. Synchrotron X-ray spectroscopy/imaging and density functional theory studies reveal depth-dependent chemical environments due to changes to factors such as charge compensation and strength of orbital hybridization. Finally, 3D spectroscopic tomography illuminates the path towards optimizing multicomponent sodium layered cathode materials, to prevent the migration of TMs upon prolonged cycling. The study reports an inaugural effort of multifaceted and counterintuitive investigation of sodium layered cathode materials and strongly implies that there is plenty of room at the bottom by tuning nano/meso scale chemical distributions for stable cathode chemistry. © 2018 The Royal Society of Chemistry.
英文关键词	Chemical hazards; Copper compounds; Density functional theory; Electric charge; Electrolytes; Iron compounds; Manganese compounds; Metal ions; Redox reactions; Sodium compounds; Sodium-ion batteries; Transition metals; Tuning; X ray spectroscopy; Compositional heterogeneity; Density functional theory studies; Layered cathode materials; Multicomponent cathodes; Spectroscopic tomographies; Stationary energy storages; Structural stabilization; Threedimensional (3-d); Cathodes; biochemical composition; building; chemical composition; chemical reaction; detection method; electrode; electrolyte; energy storage; equipment; operations technology; optimization; sodium; three-dimensional modeling; transition element
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190123
作者单位	Department of Chemistry, Virginia Tech, Blacksburg, VA 24061, United States; Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, United States; Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen, 361005, China; Xiamen University Malaysia, Sepang Selangor, 43900, Malaysia; Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States; Department of Physics, City University of Hong Kong, Kowloon, Hong Kong
推荐引用方式 GB/T 7714	Rahman M.M.,Xu Y.,Cheng H.,et al. Empowering multicomponent cathode materials for sodium ion batteries by exploring three-dimensional compositional heterogeneities[J],2018,11(9).
APA	Rahman M.M..,Xu Y..,Cheng H..,Shi Q..,Kou R..,...&Lin F..(2018).Empowering multicomponent cathode materials for sodium ion batteries by exploring three-dimensional compositional heterogeneities.Energy & Environmental Science,11(9).
MLA	Rahman M.M.,et al."Empowering multicomponent cathode materials for sodium ion batteries by exploring three-dimensional compositional heterogeneities".Energy & Environmental Science 11.9(2018).