精品欧美-日韩毛片在线-免费成人小视频-韩国av一区-欧美色拍-91在线精品播放-欧美性大战久久久-亚洲最大成人网色-日韩一卡二卡三卡四卡-黄色片网站在线-啊啊啊快点视频

1. Article overview.

Lithium metal is considered to be one of the most promising lithium-based battery anodes due to its high theoretical weight capacity (3860 mAh g -1) and low potential (-3.04 V vs standard hydrogen electrode (SHE)). Unfortunately, in the repeated plating and stripping process, uncontrollable dendrites generally exist in the lithium anode, which leads to short cycle life and even short circuit of the lithium battery. Here, a single zinc atom is fixed on the MXene (Ti3C2Clx) layer (Zn-MXene) to effectively induce Li nucleation and growth. In the initial plating stage, due to the large amount of Zn atoms, lithium tends to nucleate uniformly on the surface of the Zn-mxene layer, and then due to the strong lightning rod effect at the edge, it grows vertically along the nucleation position to form a bowl-shaped lithium, but there are no lithium branches. crystal. Therefore, the use of Zn-MXene film as the lithium anode has an overpotential of 11.3 mV, a long cycle life (1200 hours), and a deep stripping of up to 40 mAh cm-2.

Two, graphic guide

Figure 1. a) Synthesis process of a single zinc atom fixed on the MXene layer (ZnMXene) for lithium nucleation and growth. b) Typical TEM image of Zn-MXene nanosheets, showing transparent characteristics. c, d) HAADF-STEM image, showing high density of bright spots (zinc atoms) in MXene nanosheets. e) STEM image of the Zn-MXene-Li layer after nitrogen labeling at a plating level of 0.1 μAh cm-2. The distribution of related elements f) Ti and g) N (Li) indicates that Li nucleates uniformly on the ZnMXene layer.

Figure 3. a) The rate capability of Zn-MXene-Li anodes at different current densities (1 -16 mA cm -2). b) The deep peeling and electroplating behavior of Zn-MXene-Li anodes with different capacities in the range of 5-40 mAh cm-2 (1 mA cm-2). c) SEM images of Zn-MXene-Li anode under 5 d, 10, e) 20 and f) 40mAhcm-2.

Figure 4. a) Selected discharge-charge curves of Zn-MXene-Li/LFP batteries at different rates (0.5-5.0 C). b) The rate capability of Zn-MXene-Li//LFP, MXene-Li//LFP and Cu-Li//LFP batteries shows good rate capability even at 10 C. c) Cycle performance of Zn-MXene-Li //LFP, MXene-Li//LFP and Cu-Li//LFP batteries at 2 C. d) Long-cycle performance of Zn-MXeneLi//LFP battery at 10 C. (C=170 mA g -1)

3. Full text summary

In summary, we prove that metallic lithium initially tends to nucleate and grow on the MXene layer where a single zinc atom is fixed. Subsequently, due to the action of the active zinc sites on the plane and the strong lightning rod effect at the edges, lithium grows vertically along the nucleation sites to provide bowl-shaped lithium. Therefore, the anode has low overpotential, long cycle life and good deep stripping performance. By utilizing the unique electrochemical behavior of Zn-MXene-Li, the complete battery shows a good cycle life of up to 500 times at 10°C. In addition, based on mature rolling and spraying technology, Zn-MXene film and its mixed lithium anode can be easily scaled up, which will greatly benefit the development of lithium batteries in the future.

This information is sourced from the Internet for academic exchanges only. If there is any infringement, please contact us to delete it immediately.