通过三合一改性提高锂离子电池富镍阴极的化学机械稳定性和高倍率性能

IF 18.9 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Cong Li , Jinzhong Liu , Yuefeng Su , Jinyang Dong , Hongyun Zhang , Meng Wang , Yibiao Guan , Kang Yan , Na Liu , Yun Lu , Ning Li , Yu Su , Feng Wu , Lai Chen
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引用次数: 0

摘要

富镍阴极具有高比容量和成本效益,被认为是高能锂离子电池的理想候选材料。然而,这些阴极显示出明显的结构不稳定性,在高压下快速充电和长时间循环时会出现严重的应变传播,阻碍了它们的广泛商业化。为了在不影响能量和功率密度的情况下解决这种化学机械不稳定性问题,我们提出了一种高效的改性策略,包括六价金属阳离子诱导的三合一改性,以重建纳米级表面相。该策略包括在富镍阴极微球表面均匀掺杂 W、整合阳离子混合相和 Li2WO4 纳米层。掺杂 W 可加强与氧的结合,从而提高结构的稳定性,抑制深度脱硫过程中从层状到岩盐相转变过程中的氧损耗。此外,在阴极表面建立一个具有最佳厚度的阳离子混合域可提高锂的扩散性,缓解粒子结构退化。此外,Li2WO4 纳米层还能减少电解质副反应,并作为阻尼介质抵御循环应力。重要的是,为了更好地理解速率依赖性降解机制,我们对不同电流速率下改性前后的结构变化进行了详细研究。这些发现为高速利用可行的富镍阴极、确保延长电动汽车的使用寿命提供了宝贵的机理见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhancing chemomechanical stability and high-rate performance of nickel-rich cathodes for lithium-ion batteries through three-in-one modification
Ni-rich cathode, recognized for high specific capacities and cost-effectiveness, are deemed promising candidates for high-energy Li-ion batteries. However, these cathodes display notable structural instability and experience severe strain propagation during rapid charging and extended cycling under high voltage, hindering their widespread commercialization. To tackle this chemo-mechanical instability without compromising energy and power density, we propose an efficient modification strategy involving hexavalent metal cation-induced three-in-one modification to reconstruct the nanoscale surface phase. This strategy includes uniform W-doping, integration of cation-mixed phases, and Li2WO4 nanolayers on the surface of Ni-rich cathode microspheres. W-doping strengthen the bond to oxygen, thereby enhancing structural stability and suppressing oxygen loss linked to a layered-to-rock salt phase transition during deep delithiation process. Additionally, establishing a cation-mixing domain with an optimal thickness on the cathode surface enhances Li⁺ diffusivity and alleviates particle structural degradation. Moreover, Li2WO4 nanolayers reduce electrolyte side reactions and act as a damping medium against cycling stresses. Importantly, detailed investigations into structural changes before and after modification at varying current rates were conducted to better comprehend the rate-dependent degradation mechanism. These findings yield valuable mechanistic insights into the high-rate utilization of a viable Ni-rich cathode, ensuring prolonged service life in electric vehicles.
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来源期刊
Energy Storage Materials
Energy Storage Materials Materials Science-General Materials Science
CiteScore
33.00
自引率
5.90%
发文量
652
审稿时长
27 days
期刊介绍: Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field. Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy. Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.
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