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首页> 外文期刊>RSC Advances >Carbon-coated Ni3Sn2 nanoparticles embedded in porous carbon nanosheets as a lithium ion battery anode with outstanding cycling stability
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Carbon-coated Ni3Sn2 nanoparticles embedded in porous carbon nanosheets as a lithium ion battery anode with outstanding cycling stability

机译：嵌入碳纳米片中的碳包覆Ni3Sn2纳米粒子作为锂离子电池阳极具有出色的循环稳定性

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摘要

Carbon-coated Ni3Sn2 nanoparticles uniformly embedded in two-dimensional porous carbon nanosheets (2D Ni3Sn2@C@PGC) as superior lithium ion battery anode material were fabricated by a facile and scalable method, which involves in situ synthesis of 2D Ni@C@PGC and chemical vapor transformation processes from 2D Ni@C@PGC to Ni3Sn2@C@PGC. With the assistance of a water-soluble cubic NaCl template, 2D Ni@C@PGC was firstly in situ synthesized on the surface of NaCl particles. After vapor transformation with SnCl2, the Ni@C@PGC nanosheets were converted to Ni3Sn2@C@PGC, in which uniform Ni3Sn2 nanoparticles coated with conformal graphitized carbon layers were homogeneously embedded in 2D high-conducting carbon nanosheets with a thickness of about 30 nm. This unique 2D dual encapsulation structure with high porosity, high electronic conductivity, outstanding mechanical flexibility and short lithium ion diffusion pathway is favorable for lithium insertion and extraction during deep charge-discharge processes. As a result, the electrode fabricated using 2D Ni3Sn2@C@PGC as the anode and a lithium plate as the cathode exhibits a high reversible capacity up to 585.3 mA h g(-1) at a current density of 0.2 C (1 C = 570 mA h g(-1)) after 100 cycles, a high rate capability (484, 424, 378, 314 and 188 mA h g(-1) at 0.2, 0.5, 1, 2 and 5 C, respectively, 1 C = 570 mA h g(-1)), and superior cycling stability at a high rate (350.3 mA h g(-1) at a rate of 1 C after 180 cycles).
机译：通过一种简便，可扩展的方法，制备了均匀地嵌入二维多孔碳纳米片（二维Ni3Sn2 @ C @ PGC）中的碳包覆Ni3Sn2纳米颗粒，作为优越的锂离子电池负极材料，涉及到二维Ni @ C @ PGC的原位合成。从2D Ni @ C @ PGC到Ni3Sn2 @ C @ PGC的化学气相转化过程。借助于水溶性立方NaCl模板，首先在NaCl颗粒表面原位合成了二维Ni @ C @ PGC。用SnCl2气相转化后，将Ni @ C @ PGC纳米片转变为Ni3Sn2 @ C @ PGC，其中均匀涂覆有共形石墨化碳层的Ni3Sn2纳米粒子均匀地嵌入2D高导电碳纳米片中，其厚度约为30 nm。 。这种独特的二维双封装结构具有高孔隙率，高电子电导率，出色的机械柔韧性和短的锂离子扩散路径，非常适合在深层充放电过程中进行锂的插入和提取。结果，使用2D Ni3Sn2 @ C @ PGC作为阳极并使用锂板作为阴极制成的电极在0.2 C（1 C = 570）的电流密度下显示出高达585.3 mA hg（-1）的高可逆容量。 100次循环后的mA hg（-1）），高倍率能力（484、424、378、314和188 mA hg（-1）在0.2、0.5、1、2和5 C时分别为1 C = 570 mA hg（-1））和高循环速率（180个循环后以1 C的速率350.3 mA hg（-1））具有出色的循环稳定性。

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