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Enabling Lithium-Metal Anode Encapsulated in a 3D Carbon Skeleton with a Superior Rate Performance and Capacity Retention in Full Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-09-24 00:00:00 , DOI: 10.1021/acsami.8b13506
XiaoHui Zhou , WuJun Huang , ChenGuang Shi , Kang Wang , Rui Zhang , JinCheng Guo , YanFen Wen , ShaoJian Zhang , Qiong Wang , Ling Huang , JunTao Li , XiaoDong Zhou 1 , ShiGang Sun
Affiliation  

Suppressing the formation of lithium (Li) dendrites is central to implementing Li-metal anode, which has gained growing attention due to its ultrahigh specific capacity and low redox potential. Here, a novel approach is adopted to deposit Li-metal within a rigid three-dimensional (3D) carbon paper (3DCP) network, which consists of a cross-link framework of carbon fibers and graphene nanosheets (GNs). This unique structure yields a uniform distribution of Li-nuclei during the preliminary stage of Li-plating and the formation of a stable solid–electrolyte interface. The as-obtained anode can deliver a high areal capacity of 10 mAh cm–2 without the dendritic formation after 1000 cycles in a [email protected]/LiFePO4 full cell at 4 C. In addition, the [email protected] anode displays low voltage platform (<20 mV at 1 mA cm–2), high plating/stripping efficiency (99.0%), and long lifespan (>1000 h). When coupled with LiNi0.8Co0.15Al0.05O2 cathode, the [email protected] electrode exhibits a superior rate capability up to 10 C and high temperature performance (60 °C). The unprecedented performance is attributed to the desirable combination of micro/nanostructures in 3DCP, in which carbon fiber framework provides the mechanical stability for volume change, whereas numerous lithiophilicity sites on GNs enable the suppression of Li-dendrite growth.

中文翻译:

使锂金属阳极封装在3D碳骨架中,在全电池中具有出色的速率性能和容量保持能力

抑制锂(Li)树枝状晶体的形成对于实施锂金属阳极至关重要,由于其超高的比容量和低氧化还原电位,锂锂阳极受到越来越多的关注。在这里,采用一种新方法将锂金属沉积在刚性三维(3D)碳纸(3DCP)网络中,该网络由碳纤维和石墨烯纳米片(GNs)的交联框架组成。这种独特的结构在锂电镀的初始阶段产生了均匀的锂核分布,并形成了稳定的固体-电解质界面。在[电子邮件保护] / LiFePO 4中经过1000次循环后,所获得的阳极可以提供10 mAh cm –2的高面积容量,而不会形成枝晶。在4 C下充满电。此外,[受电子邮件保护的]阳极显示低电压平台(在1 mA cm –2时<20 mV ),高电镀/剥离效率(99.0%)和长寿命(> 1000 h)。当与LiNi 0.8 Co 0.15 Al 0.05 O 2阴极结合时,[受电子邮件保护]电极在高达10 C的温度下具有出色的倍率能力,并具有高温性能(60°C)。空前的性能归因于3DCP中微/纳米结构的理想组合,其中碳纤维骨架为体积变化提供了机械稳定性,而GN上的许多亲硫性位点能够抑制Li-树突的生长。
更新日期:2018-09-24
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