Novel three dimensional hierarchical porous Sn-Ni alloys as anode for lithium ion batteries with long cycle life by pulse electrodeposition
Novel three dimensional hierarchical porous Sn-Ni alloys as anode for lithium ion batteries with long cycle life by pulse electrodeposition
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脉冲电沉积新型三维分级多孔Sn-Ni合金作为长循环寿命锂离子电池负极
DOI：
10.1016/j.cej.2018.06.031
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发表时间：
2018-10
影响因子：
15.1
通讯作者：
X.S. Yang
中科院分区：
文献类型：
--
作者：
X. Dong;W.B. Liu;X. Chen;J.Z. Yan;N. Li;S.Q. Shi;S.C. Zhang;X.S. Yang
本文研究了一种新型的三维分层多孔Sn-Ni （3D- hp Sn-Ni）合金作为高性能锂离子电池（LIBs）的阳极，该合金是由化学合金化铸态Al55Cu45（at）在三维纳米孔铜衬底上通过脉冲电沉积制备的超细纳米颗粒介孔Sn-Ni合金。%)合金片在HCl溶液中。结果表明：制备的3D-HP Sn-Ni合金具有开放、双连续、互穿的双峰孔径分布特征，包括大尺寸（数百nm）的韧带通道网络结构和高多孔的通道壁（数nm）。与二维纳米孔Sn-Ni （2D-NP Sn-Ni）薄膜相比，3D-HP Sn-Ni合金作为锂离子电池的阳极具有优越的循环稳定性，可逆比容量为0.25 mAh cm−2，库仑效率超过95%，循环次数超过200次。此外，即使经过一系列高倍率充放电循环，也可以获得高达0.22 mAh cm−2的可逆容量。令人满意的电化学性能主要归功于其独特的三维分层多孔结构、活性物质与电解液的大接触表面积以及非活性组分良好的缓冲作用，极大地缓解了巨大的体积变化，增强了活性物质的负载质量，缩短了Li+的迁移距离，提高了电子导电性。我们相信本研究可以为高性能锂离子电池的实际应用提供一个有前途的阳极候选材料。
In this paper, novel three dimensional hierarchical porous Sn-Ni (3D-HP Sn-Ni) alloys were investigated as a promising anode for high-performance Li ion batteries (LIBs), which was fabricated by pulse electrodeposition of mesoporous Sn-Ni alloy made of ultrafine nanoparticles on the 3D nanoporous copper substrate from chemical dealloying of as-cast Al55Cu45(at.%) alloy slices in the HCl solution. The results show that the as-obtained 3D-HP Sn-Ni alloys are typically characteristic of open, bicontinuous, interpenetrating bimodal pore size distribution comprising large-sized (hundreds of nm) ligament-channel network architecture with highly porous channel walls (several nm). Compared to the two dimensional nanoporous Sn-Ni (2D-NP Sn-Ni) thin films, the 3D-HP Sn-Ni alloys as anode for LIBs show superior cycling stability with reversible specific capacity of 0.25 mAh cm−2and coulombic efficiency of more than 95% up to 200 cycles. Moreover, the reversible capacity as high as 0.22 mAh cm−2can be achieved even after a series of high-rate charge–discharge cyclings. The satisfactory electrochemical properties can be mainly ascribed to the unique 3D hierarchical porous structure, large contact surface area between active material and electrolyte, as well as good buffer effect of inactive component, which is greatly beneficial to alleviate the huge volume variation, enhance the loading mass of active material, shorten the Li+migration distance and improve the electron conductivity. We believe that this present work can provide a promising anode candidate towards practical application of high-performance LIBs.
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