当前位置: X-MOL 学术Glob. Chall. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Synthesis of Ni@NiSn Composite with High Lithium-Ion Diffusion Coefficient for Fast-Charging Lithium-Ion Batteries.
Global Challenges ( IF 4.4 ) Pub Date : 2019-11-22 , DOI: 10.1002/gch2.201900073
Hong Zhao 1, 2, 3 , Junxin Chen 1 , Weiwei Wei 1 , Shanming Ke 1 , Xierong Zeng 1 , Dongchu Chen 2 , Peng Lin 1
Affiliation  

To solve the problems of fast‐charging of lithium‐ion batteries in essence, development of new electrode materials with higher lithium‐ion diffusion coefficients is the key. In this work, a novel flower‐like Ni@SnNi structure is synthesized via a two‐step process design, which consists of the fabrication of Ni cores by spray pyrolysis followed by the formation of SnNi shells via a simple oxidation–reduction reaction. The obtained Ni@SnNi composite exhibits an initial capacity of ≈693 mA h g−1 and a reversible capacity of ≈570 mA h g−1 after 300 charge/discharge cycles at 0.5 C, and maintains 450 mA h g−1 even at a high rate of 3 C. Further, it is proved that a Ni@SnNi composite possesses high lithium‐ion diffusion coefficient (≈10−8), which is much higher than those (≈10−10) reported previously, which can be mainly attributed to the unique flower‐like Ni@SnNi structure. In addition, the full cell performance (Ni@SnNi‐9h/graphite vs LiCoO2) with a capacity ratio of 1.13 (anode/cathode) is also tested. It is found that even at 2 C rate charging/discharging, the capacity retention at 100 cycles is still close to 89%. It means that Ni@SnNi‐9h is a promising anode additive for lithium‐ion batteries with high energy density and power density.

中文翻译:

具有高锂离子扩散系数的Ni @ NiSn复合材料的合成,用于快速充电的锂离子电池。

从本质上解决锂离子电池快速充电的问题,开发具有更高锂离子扩散系数的新型电极材料是关键。在这项工作中,通过两步工艺设计合成了一种新型的花状Ni @ SnNi结构,该结构包括通过喷雾热解法制备Ni核,然后通过简单的氧化还原反应形成SnNi壳。所获得的Ni @ SnNi复合材料在0.5 C的300次充电/放电循环后表现出的初始容量为约693 mA hg -1和可逆容量为约570 mA hg -1,并且即使在高速率下也保持450 mA hg -1 3。此外,证明了一个镍@ SnNi复合具有较高的锂离子扩散系数(≈10 -8),远高于之前报道的(≈10 -10),这主要归因于独特的花状Ni @ SnNi结构。此外,还测试了容量比为1.13(阳极/阴极)的全电池性能(Ni @ SnNi-9h /石墨与LiCoO 2)。发现即使在2C速率的充电/放电下,在100次循环下的容量保持率仍然接近89%。这意味着Ni @ SnNi-9h是具有高能量密度和功率密度的锂离子电池的有希望的负极添加剂。
更新日期:2019-11-22
down
wechat
bug