Self-assembled Zn-Al-F layered double hydroxides enabling dendrite-free Zn deposition process in high-rate Ni-Zn secondary batteries
Self-assembled Zn-Al-F layered double hydroxides enabling dendrite-free Zn deposition process in high-rate Ni-Zn secondary batteries
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自组装Zn-Al-F层状双氢氧化物可在高倍率Ni-Zn二次电池中实现无枝晶的锌沉积过程
DOI：
10.1016/j.jpowsour.2019.227412
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发表时间：
2020-02-01
影响因子：
9.2
通讯作者：
Lv, Huifang
中科院分区：
文献类型：
--
作者：
Yan, Xinyu;Chen, Zexiang;Lv, Huifang
锌负极在重复充放电过程中循环稳定性有限，枝晶生长不良，严重制约了高倍率锌基二次电池的实际应用。在这里，我们介绍了锌铝氟层状双氢氧化物(LHD)的设计和制备，以实现锌酸盐的均匀沉积和抑制树枝晶的形成。锌酸盐的无枝晶沉积主要归因于所制备的锌铝氟合金具有均匀的尺寸分布、含氟的功能过渡层、可调节的电流密度分布、丰富的电化学活性中心和高效的离子扩散通道。此外，还研究了锌铝氟二次电池中锌铝氟锂电池的性能，其比容量高达383.08 mA h g(-1)，循环稳定性好，1 A g(-1)循环500次后容量保持率为89.03%。在100Ag(-1)电流密度下，电池的峰值功率密度为168.9 kW kg(-1)，能量密度为466.08 W h kg(-1)，明显高于已报道的镍锌电池中的LHD。
The practical utilization of high-rate Zn-based secondary batteries is seriously plagued by the limited cycle stability and undesirable dendrite growth of Zn anodes during repeated charge/discharge process. Herein, we present the design and preparation of Zn-Al-F layered double hydroxides (LHDs) to enable the uniform zincate deposition and inhibit dendrite formation. The dendrite-free deposition of zincate is mainly ascribed to the uniform size distribution, fluorine-intercalated functional interlayer, regulated current density distribution, abundant electrochemical active sites and efficient ion diffusion channel of as-prepared Zn-Al-F LHDs. Furthermore, the potential of Zn-Al-F LHDs is investigated in a Ni-Zn aqueous secondary battery, which renders a high specific capacity of 383.08 mA h g(-1) based on the total mass of Zn-Al-F LHDs and excellent cyclic stability with a capacity retention of 89.03% after 500 cycles at 1 A g(-1). Moreover, at the current density of 100 A g(-1), a peak power density of 168.9 kW kg(-1) and a high energy density of 466.08 W h kg(-1) have been achieved, which are significantly higher than the previously reported LHDs in Ni-Zn batteries.