Fast-chargeable lithium-ion batteries by μ-Si anode-tailored full-cell design

IF 9.4 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Taeyong Lee, Min Ji Seong, Hyo Chul Ahn, Minsung Baek, Kiho Park, Jihoon Oh, Taehoon Choi, Jang Wook Choi
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Abstract

Silicon (Si) anodes have long been recognized to significantly improve the energy density and fast-charging capability of lithium-ion batteries (LIBs). However, the implementation of these anodes in commercial LIB cells has progressed incrementally due to the immense volume change of Si across its full state-of-charge (SOC) range. Here, we report an anode-tailored full-cell design (ATFD), which incorporates micrometer-sized silicon (μ-Si) alone, for operation over a limited, prespecified SOC range identified as 30−70%. This range allows homogeneous (de)lithiation throughout the electrode, accompanied by an acceptable level of volume change. The ATFD-based cell exhibits 21.3% higher gravimetric energy density than that of its graphite-based counterpart in a commercial 18650 cylindrical cell and 84.6% capacity retention after 500 cycles even at a fast-charging rate of 3 C. This study indicates that the partial, intermediate SOC operation of the μ-Si anode can markedly increase the energy density and boost the fast-charging capability of a LIB cell, a challenging task in traditional cell engineering.
快速充电锂离子电池采用μ-Si阳极定制的全电池设计
硅(Si)阳极在提高锂离子电池(LIBs)的能量密度和快速充电能力方面一直被认为是显著的。然而,由于Si在其全荷电状态(SOC)范围内的巨大体积变化,这些阳极在商用锂电池中的应用已经逐步取得进展。在这里,我们报告了一种阳极定制的全电池设计(ATFD),它仅包含微米尺寸的硅(μ-Si),用于在有限的,预先指定的SOC范围内工作,确定为30 - 70%。该范围允许整个电极均质(去)锂化,伴随着可接受的体积变化水平。在商用18650圆柱形电池中,atfd基电池的重量能量密度比石墨基电池高21.3%,即使在3℃的快速充电速率下,500次循环后的容量保持率也提高了84.6%。研究表明,μ si阳极的部分、中间SOC操作可以显著提高能量密度,提高LIB电池的快速充电能力,这是传统电池工程中一个具有挑战性的任务。
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来源期刊
CiteScore
19.00
自引率
0.90%
发文量
3575
审稿时长
2.5 months
期刊介绍: The Proceedings of the National Academy of Sciences (PNAS), a peer-reviewed journal of the National Academy of Sciences (NAS), serves as an authoritative source for high-impact, original research across the biological, physical, and social sciences. With a global scope, the journal welcomes submissions from researchers worldwide, making it an inclusive platform for advancing scientific knowledge.
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