JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 47
·期 2
·1705-1712
·
IF 1.579
Han Jing,Wang Yan,Tan Shihai,Guo Fu
Electromigration is a major reliability problem in composite solder joints. Due to the anisotropy of the β -Sn crystal structure, the Sn grain orientations present in the solder matrix dominate the principal failure mechanism in solder joints under electric current stressing. In this work, the Cu 6 Sn 5 growth behavior in Cu 6 Sn 5 -reinforced composite solder joints with three different Sn grain orientations was investigated at current density of 10 4 A/cm 2 at room temperature. Micron-sized Cu particles were added to Sn-3.5Ag solder at 2% volume fraction using an in situ method. After current stressing for 528 h, the polarity effect in the composite solder joint was greatest for an angle ( θ ) between the c -axis and electron flow direction of 30°, resulting in higher growth rate of Cu 6 Sn 5 in the solder matrix compared with composite solder joints with θ of 60° or 90°. There were no noticeable changes in the composite solder joint with θ of 90°. The growth behavior of Cu 6 Sn 5 , Cu atomic motion, and Cu diffusivity in the composite solder joints with different Sn grain orientations were analyzed in detail.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Pifeng Wei,Piyong Zhang,Yifan Zhang,Xuemei Li
A plasmonic Cu 6 Sn 5 /polyaniline (Cu 6 Sn 5 /PANI) nanocomposite was synthesized by chemical reduction and hydrothermal methods. The best photocatalytic overall water splitting performance was achieved by the Cu 6 Sn 5 /PANI 3wt% composite, which contains 3 wt% PANI, which is approximately three times more than that of pure Cu 6 Sn 5 . Meanwhile, Cu 6 Sn 5 /PANI 3wt% exhibited excellent photocatalytic stability for water splitting during the stability investigation. The dramatic promotion of the photocatalytic activity performance can be ascribed to the cocatalyst PANI. The existence of PANI can remarkably promote the separation and transfer efficiency of the photoinduced electron-hole pairs, and therefore enhance the photocatalytic activity. Our results also verify that the photogenerated charge comes from plasmonic Cu 6 Sn 5 with the surface plasmon resonance (SPR) effect, which is different from traditional semiconductor-based photocatalysts. This work sheds some light on plasmonic photocatalyst development and provides an alternative pathway for photocatalytic reactions.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zhicong Ni,Yiyong Zhang,Bowen Zhu,Yanjie Wang,Ying Wang,Xue Li,Yingjie Zhang,Shigang Sun
The unstable electrode/electrolyte interface of the lithium metal anode is one of the reasons that induce the formation of lithium (Li) dendrites. The Li dendrites will reduce the coulombic efficiency, and even pierce the separator to cause the safety problems. Herein, a tightly bonded and uniformly distributed Cu 6 Sn 5 interface layer is formed on the surface of the Cu foam by a simple electroless plating method. The composite layer has multiple functions, such as high lithiophilicity, high carrier transport and high adaptability to mechanical strain. Based on the versatility of the Cu 6 Sn 5 interface layer, the cycle life of Cu foam is increased from 150 h to 1000 h, and the deposition overpotential is as low as 18 mV. In-situ online observation proves that the existence of composite layer can make Li metal uniformly deposited to avoid the dendrites. Furthermore, Cu 6 Sn 5 @Cu foam also shows a higher capacity retention rate (increased from 65.2% to 78.6% after 300 cycles) and a more stable rate performance when it is used in full batteries . Compared with the single function improvement strategy proposed by the current lithium metal anode research. The Cu 6 Sn 5 multifunctional composite layer modification method in this work provides a new strategy for constructing a stable electrode/electrolyte interface.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 33
·期 1
·235-243
·
IF 2.478
He Yawen,Ye Zhongbin,Chamas Mohamad,Sougrati Moulay Tahar,Lippens Pierre-Emmanuel
Porous Si/Cu 6 Sn 5 /C composite containing native oxides was prepared via solid-state mechanical milling and wet chemical etching. This composite was used as anode material for Li-ion batteries. X-ray diffraction, scanning electron microscopy, 119 Sn Mössbauer spectroscopy, and X-ray photoelectron spectroscopy show that the composite has a pitaya-like morphology based on porous Si and embedded Cu 6 Sn 5 non-porous microparticles with surface native oxides. Both Si and Cu 6 Sn 5 are electrochemically active, and the activation process during the first charge–discharge improves the nanostructuration of the composite that helps buffer the volume variations of the Li-Si and Li-Sn alloying reactions. The porous composite delivers a reversible and stable capacity of 900 mAh g −1 at a galvanostatic current density of 422 mA g −1 with a retention of 90% for 100 cycles, which is higher than porous Si (53%). The stability during cycling is explained by buffering effect, enhanced electrode conductivity, and stable SEI due to the presence of native oxides and the use of FEC-containing electrolyte.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
NATURE MATERIALS
·
2024
·Vol. 23
·期 12
·1686-1694
·
IF 37.2
Shi Jie,Koketsu Toshinari,Zhu Zhenglu,Yang Menghao,Sui Lijun,Liu Jie,Tang Mingxue,Deng Zhe,Liao Mengyi,Xiang Jingwei,Shen Yue,Qie Long,Huang Yunhui,Strasser Peter,Ma Jiwei
‘Anode-free’ Li metal batteries offer the highest possible energy density but face low Li coulombic efficiency when operated in carbonate electrolytes. Here we report a performance improvement of anode-free Li metal batteries using p -block tin octoate additive in the carbonate electrolyte. We show that the preferential adsorption of the octoate moiety on the Cu substrate induces the construction of a carbonate-less protective layer, which inhibits the side reactions and contributes to the uniform Li plating. In the mean time, the reduction of Sn 2+ at the initial charging process builds a stable lithophilic layer of Cu 6 Sn 5 alloy and Sn, improving the affinity between the Li and the Cu substrate. Notably, anode-free Li metal pouch cells with tin octoate additive demonstrate good cycling stability with a high coulombic efficiency of ~99.1%. Furthermore, this in situ p -block layer plating strategy is also demonstrated with other types of p -block metal octoate, as well as a Na metal battery system, demonstrating the high level of universality.
研究领域:
电化学
·
电池技术
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）