A Framework with Enriched Fluorinated Sites for Stable Li Metal Cycling
文献类型：期刊论文
| 作者 | Wang, Muqin; Peng, Zhe; Lin, Huan; Li, Zhendong; Liu, Jian; Ren, Zhongmin; He, Haiyong; Wang, Deyu |
| 刊名 | ACTA PHYSICO-CHIMICA SINICA
 |
| 出版日期 | 2021 |
| 卷号 | 37期号:1 |
| 关键词 | FREE LITHIUM DEPOSITION BATTERIES CAPACITY ANODES LAYER |
| 英文摘要 | In past decades, lithium-ion batteries (LIBs) were the dominant energy storage systems for powering portable electronic devices because of their reliable cyclability. However, further increase in the energy density of LIBs was met by a bottleneck when low-specific-capacity graphite was used at the anode. Li metal has long been regarded as the ideal anode material for building the next high-energy-density batteries due to its ultrahigh capacity of 3860 mAh.g(-1), which is ten times higher than that of graphite. However, using Li metal as an anode in rechargeable batteries is challenging due to its high uncontrolled volume expansion and aggressive side reactions with liquid electrolytes. In this study, we demonstrate the effect of a three-dimensional (3D) framework with enriched fluorinated sites for Li metal protection. This framework is obtained via a facile integration of down-sized fluorinated graphite (CFx) particles into Li+ conducting channels. Thermogravimetry, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy results show that Li+ conducting channels rich in lithium fluoride (LiF) are formed in situ across the embedded CFx particles during the initial lithiation process, leading to fast Li+ transfer. Scanning electron microscopy results show that residual CFx particles could act as high-quality nucleation sites for uniform Li deposition inside the framework. These features could not be achieved with a 2D structure consisting of large CFx flakes, due to the limited Li+ transfer paths and low utilization ratio of CFx for conversion into LiF-based solid electrolyte interphase (SEI) layers. Consequently, better performance of Li metal anodes in a 3D framework with enriched fluorinated sites is demonstrated. Stable Li plating/stripping over 240 cycles is obtained at a current density of 0.5 mA.cm(-2) for a fixed capacity of 1 mAh.cm(-2) by maintaining a voltage hysteresis below 80 mV. Improved Li-LiFePO4 full cell performance with a practical negative/positive capacity ratio of 3 is also demonstrated. These results show the rational combination of well-developed 3D Li+ transfer channels and enriched fluorinated sites as an optimized interfacial design beyond the single use of a 2D fluorinated interface, giving new insight into the protection of Li metal anodes in high-energy-density batteries. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/22282]  |
| 专题 | 中国科学院宁波材料技术与工程研究所 2021专题_期刊论文 |
| 作者单位 | 1.He, HY 2.Peng, Z 3.Wang, DY (corresponding author), Jianghan Univ, Key Lab Optoelect Chem Mat & Devices, Minist Educ, Wuhan 430056, Peoples R China. 4.Wang, DY (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China. 5.Wang, DY (corresponding author), Tianmu Lake Inst Adv Energy Storage Technol, Liyang 213300, Jiangsu, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Wang, Muqin,Peng, Zhe,Lin, Huan,et al. A Framework with Enriched Fluorinated Sites for Stable Li Metal Cycling[J]. ACTA PHYSICO-CHIMICA SINICA,2021,37(1). |
| APA | Wang, Muqin.,Peng, Zhe.,Lin, Huan.,Li, Zhendong.,Liu, Jian.,...&Wang, Deyu.(2021).A Framework with Enriched Fluorinated Sites for Stable Li Metal Cycling.ACTA PHYSICO-CHIMICA SINICA,37(1). |
| MLA | Wang, Muqin,et al."A Framework with Enriched Fluorinated Sites for Stable Li Metal Cycling".ACTA PHYSICO-CHIMICA SINICA 37.1(2021). |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。