利用表面诱导尖晶石结构和掺杂 F 的协同策略提高富锂阴极的电化学性能

IF 4.8 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Progress in Natural Science: Materials International Pub Date : 2024-06-01 DOI:10.1016/j.pnsc.2024.04.010
Yuezhen Wang , Ningbo Qin , Xun Yuan , Shiming Qiu , Fangli Ji , Ruirui Tuo , Tingfeng Guan , Cheng Yang , Jiang Zhu , Miao Ge , Hui Wang , Yan Cheng , Zhaozhe Yu
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引用次数: 0

摘要

由于阳离子和阴离子的协同氧化还原效应,富锂锰基材料比商用 NCM 层状材料具有更高的容量。然而,在循环过程中,高电压范围内不可逆的氧释放会导致晶格应变和结构坍塌,从而导致严重的容量和电压衰减。本文提供了一种表面尖晶石结构和掺杂 F 的协同策略,以提高结构的稳定性。表面尖晶石结构有助于减少电解质腐蚀对阴极造成的结构坍塌,并有效抑制结构演变导致的电压衰减。通过掺杂 F 形成更强的 Mn-F 键,可抑制过渡金属 (TM) 的迁移,并促使 LiF 均匀沉积,从而在阴极上形成更薄、更稳定的 CEI。因此,设计的阴极(LMNO-NF)显示出显著的循环性能,在 1C 下循环 200 次,容量保持率为 86.68%,电压保持率为 96.6%,高于原始材料(68.76% 和 85.75%)。因此,这种一步合成的简单双改性策略有望有效解决富锂锰基正极材料的结构演化和电压衰减问题,实现进一步的商业化。
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Synergistic strategy of surface-induced spinel structure and F doping to improve the electrochemical performance of Li-rich cathodes

Li-rich Mn-based materials provide higher capacity than commercial NCM layered materials due to the synergistic redox effect of cations and anions. However, lattice straining and structural collapse caused by the irreversible oxygen release at high voltage range during cycling, which results in severe capacity and voltage decay. Herein, a synergistic strategy of surface-induced spinel structure and F doping is provided to improve the structural stability. The surface spinel structure helps to reduce the structural collapse caused by electrolyte corrosion on the cathode and effectively inhibits voltage decay resulted from structural evolution. The stronger Mn-F bonds are formed by F doping to inhibit migration of transition metal (TM) and induce the uniform deposition of LiF to form the thinner and more stable CEI on the cathode. Accordingly, the designed cathode (LMNO-NF) shows remarkable cycling performance with the capacity retention of 86.68 ​% and voltage retention of 96.6 ​% for 200 cycles at 1C, higher than pristine material (68.76 ​% and 85.75 ​%). Therefore, this simple dual-modification strategy of one-step synthesis is promising for solving the structural evolution and voltage decay of Li-rich Mn-based cathode materials effectively, achieving further commercialization.

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来源期刊
CiteScore
8.60
自引率
2.10%
发文量
2812
审稿时长
49 days
期刊介绍: Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings. As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.
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