纳米片
材料科学
法拉第效率
阳极
成核
锂(药物)
电解质
阴极
金属
电流密度
纳米技术
化学工程
冶金
电极
物理化学
有机化学
物理
化学
量子力学
内分泌学
工程类
医学
作者
Qian Chen,Yi Wei,Xiaokun Zhang,Zhilin Yang,Fan Wang,Wei Liu,Jinghan Zuo,Xiaokang Gu,Yong Yao,Xingguo Wang,Feifei Zhao,Shubin Yang,Yongji Gong
标识
DOI:10.1002/aenm.202200072
摘要
Abstract Lithium (Li) metal is considered as one of the best anode materials due to its high theoretical capacity and low reduction potential. However, its practical application is restricted by uneven Li metal dendrite growth. Herein, vertically aligned Ti 3 C 2 T x MXene nanosheet arrays synthesized by a facile ice template assisted blade coating method are adopted to regulate Li metal nucleation and guide Li metal deposition. This kind of vertical structure exhibits low tortuosity that can achieve homogeneous and fast Li transport. In addition, the rich F and O groups on the Ti 3 C 2 T x surface are conducive to the formation of a uniform solid–electrolyte interphase layer, which plays an important role in regulating the nucleation and growth of Li metal. Consequently, the vertically aligned Ti 3 C 2 T x electrodes achieve high Coulombic efficiencies (98.8%) for more than 450 cycles at a fixed areal capacity of 1.0 mAh cm −2 with a current density of 1.0 mA cm −2 . Moreover, it can maintain stable lithium plating/striping behaviors even at an ultrahigh current density of 5.0 mA cm −2 and high areal capacity of 5.0 mAh cm −2 . Furthermore, full batteries (LiFePO 4 as cathode) paired with these vertically aligned Ti 3 C 2 T x electrodes show superior stability and rate performance than the horizontally aligned Ti 3 C 2 T x electrodes.
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