Interfacial nitrogen stabilizes carbon-coated mesoporous silicon particle anodes

2016 ◽  
Vol 4 (2) ◽  
pp. 434-442 ◽  
Author(s):  
Xiang Han ◽  
Huixin Chen ◽  
Xin Li ◽  
Jianyuan Wang ◽  
Cheng Li ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Silicon Particle ◽  
Solid Electrolyte Interphase ◽  
Capacity Retention ◽  
Mesoporous Silicon ◽  
Carbon Coated ◽  
First Time

We report for the first time that the interfacial Si–N–C layer could stabilize the solid–electrolyte interphase of a cabon-coated mesoporous silicon particle anode and enable 100% capacity retention after 400 cycles at 0.1 A g−1.

Adhesion and Surface Layers on Silicon Anodes Suppress Formation of c-Li3.75Si and Solid Electrolyte Interphase

2019 ◽  
Author(s):  
Hezhen Xie ◽  
Sayed Youssef Sayed ◽  
W. Peter Kalisvaart ◽  
Simon Jakob Schaper ◽  
Peter Müller-Buschbaum ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Photoelectron Spectroscopy ◽  
Solid Electrolyte Interphase ◽  
Copper Substrate ◽  
Lithium Ion ◽  
Adhesion Layer ◽  
Capacity Retention ◽  
Silicon Anodes ◽  
Capacity Degradation ◽  
The Stability

<div>The formation of c-Li3.75Si is known to be detrimental to silicon anodes in lithium-ion batteries. To suppress the formation of this crystalline phase and improve the electrochemical performance of Sibased anodes, three approaches were amalgamated: addition of a nickel adhesion sublayer, alloying of the silicon with titanium, and the addition of either carbon or TiO2 as a capping layer. The silicon-based films were analyzed by a suite of methods, including scanning electron microscopy (SEM) and a variety of electrochemical methods, as well as X-ray photoelectron spectroscopy (XPS) to provide insights into the composition of the resulting solid electrolyte interphase (SEI). A nickel adhesion layer decreased the extent of delamination of the silicon from the underlying copper substrate, compared to Si deposited directly on Cu, which resulted in less capacity loss. Alloying of silicon with titanium (85% silicon, 15% titanium) further increased the stability. Finally, capping these multilayer electrodes with either a thin 10 nm layer of carbon or TiO2 resulted in the best electrode behavior, and lowest cumulative relative irreversible capacity. TiO2 is slightly more effective in enhancing the capacity retention, most likely due to differences in the resulting solid electrolyte interphase (SEI). The combination of an adhesion layer, alloying, and surface coatings shows a cumulative suppression of the formation of c-Li3.75Si and SEI, resulting in the greatest improvement of capacity retention when all three are incorporated together. However, these strategies appear to only delay the onset of the c-Li3.75Si phase; eventually, the c-Li3.75Si phase will form, and at that point, the rate of capacity degradation of all the electrodes becomes similar.</div>

scholarly journals Effects of Structural Substituents on the Electrochemical Decomposition of Carbonyl Derivatives and Formation of the Solid–Electrolyte Interphase in Lithium-Ion Batteries

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7352
Author(s):  
S. Hamidreza Beheshti ◽  
Mehran Javanbakht ◽  
Hamid Omidvar ◽  
Hamidreza Behi ◽  
Xinhua Zhu ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Lithium Ion Batteries ◽  
Elevated Temperatures ◽  
Solid Electrolyte Interphase ◽  
Lithium Ion ◽  
Comparative Approach ◽  
Capacity Retention ◽  
Decomposition Products ◽  
Carbonyl Derivatives

The solid–electrolyte interphase (SEI), the passivation layer formed on anode particles during the initial cycles, affects the performance of lithium-ion batteries (LIBs) in terms of capacity, power output, and cycle life. SEI features are dependent on the electrolyte content, as this complex layer originates from electrolyte decomposition products. Despite a variety of studies devoted to understanding SEI formation, the complexity of this process has caused uncertainty in its chemistry. In order to clarify the role of the substituted functional groups of the SEI-forming compounds in their efficiency and the features of the resulting interphase, the performance of six different carbonyl-based molecules has been investigated by computational modeling and electrochemical experiments with a comparative approach. The performance of the electrolytes and stability of the generated SEI are evaluated in both half-cell and full-cell configurations. Added to the room-temperature studies, the cyclability of the NMC/graphite cells is assessed at elevated temperatures as an intensified aging condition. The results show that structural adjustments within the SEI-forming molecule can ameliorate the cyclability of the electrolyte, leading to a higher capacity retention of the LIB cell, where cinnamoyl chloride is introduced as a novel and more sustainable SEI forming agent with the potential of improving the LIB capacity retention.

Adhesion and Surface Layers on Silicon Anodes Suppress Formation of c-Li3.75Si and Solid Electrolyte Interphase

2019 ◽  
Author(s):  
Hezhen Xie ◽  
Sayed Youssef Sayed ◽  
W. Peter Kalisvaart ◽  
Simon Jakob Schaper ◽  
Peter Müller-Buschbaum ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Photoelectron Spectroscopy ◽  
Solid Electrolyte Interphase ◽  
Copper Substrate ◽  
Lithium Ion ◽  
Adhesion Layer ◽  
Capacity Retention ◽  
Silicon Anodes ◽  
Capacity Degradation ◽  
The Stability

<div>The formation of c-Li3.75Si is known to be detrimental to silicon anodes in lithium-ion batteries. To suppress the formation of this crystalline phase and improve the electrochemical performance of Sibased anodes, three approaches were amalgamated: addition of a nickel adhesion sublayer, alloying of the silicon with titanium, and the addition of either carbon or TiO2 as a capping layer. The silicon-based films were analyzed by a suite of methods, including scanning electron microscopy (SEM) and a variety of electrochemical methods, as well as X-ray photoelectron spectroscopy (XPS) to provide insights into the composition of the resulting solid electrolyte interphase (SEI). A nickel adhesion layer decreased the extent of delamination of the silicon from the underlying copper substrate, compared to Si deposited directly on Cu, which resulted in less capacity loss. Alloying of silicon with titanium (85% silicon, 15% titanium) further increased the stability. Finally, capping these multilayer electrodes with either a thin 10 nm layer of carbon or TiO2 resulted in the best electrode behavior, and lowest cumulative relative irreversible capacity. TiO2 is slightly more effective in enhancing the capacity retention, most likely due to differences in the resulting solid electrolyte interphase (SEI). The combination of an adhesion layer, alloying, and surface coatings shows a cumulative suppression of the formation of c-Li3.75Si and SEI, resulting in the greatest improvement of capacity retention when all three are incorporated together. However, these strategies appear to only delay the onset of the c-Li3.75Si phase; eventually, the c-Li3.75Si phase will form, and at that point, the rate of capacity degradation of all the electrodes becomes similar.</div>

Carbon-coated TiNb2O7 nanosheet arrays as self-supported high mass-loading anode for flexible Li-ion battery

2021 ◽  
Author(s):  
Jinquan Zhou ◽  
Haoyang Dong ◽  
Yao Chen ◽  
yihua Ye ◽  
Liang Xiao ◽  
...  
Keyword(s):  
Diffusion Length ◽  
High Mass ◽  
Carbon Cloth ◽  
Mass Loading ◽  
Solvothermal Process ◽  
Li Ion Battery ◽  
Nanosheet Arrays ◽  
Carbon Coated ◽  
Li Ion ◽  
First Time

TiNb2O7 anode constructed with carbon-coated nanosheet arrays on carbon cloth is prepared by a facile solvothermal process and post carbon-coating for the first time. With nanosized diffusion-length and reduced polarization...

Unveiling the Formation of Solid Electrolyte Interphase and its Temperature Dependence in “Water-in-Salt” Supercapacitors

2021 ◽  
Vol 13 (3) ◽  
pp. 3979-3990
Author(s):  
Ting Quan ◽  
Eneli Härk ◽  
Yaolin Xu ◽  
Ibbi Ahmet ◽  
Christian Höhn ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Temperature Dependence ◽  
Solid Electrolyte Interphase

Reactivity and Evolution of Ionic Phases in the Lithium Solid–Electrolyte Interphase

2021 ◽  
pp. 877-885
Author(s):  
Rui Guo ◽  
Dongniu Wang ◽  
Lucia Zuin ◽  
Betar M. Gallant
Keyword(s):  
Solid Electrolyte ◽  
Solid Electrolyte Interphase

scholarly journals Probing the Na metal solid electrolyte interphase via cryo-transmission electron microscopy

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Bing Han ◽  
Yucheng Zou ◽  
Zhen Zhang ◽  
Xuming Yang ◽  
Xiaobo Shi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Solid Electrolyte ◽  
Solid Electrolyte Interphase ◽  
Metal Electrode ◽  
Liquid Electrolyte ◽  
Battery Materials ◽  
Cryogenic Transmission Electron Microscopy ◽  
Transmission Electron ◽  
Fluoroethylene Carbonate

AbstractCryogenic transmission electron microscopy (cryo-TEM) is a valuable tool recently proposed to investigate battery electrodes. Despite being employed for Li-based battery materials, cryo-TEM measurements for Na-based electrochemical energy storage systems are not commonly reported. In particular, elucidating the chemical and morphological behavior of the Na-metal electrode in contact with a non-aqueous liquid electrolyte solution could provide useful insights that may lead to a better understanding of metal cells during operation. Here, using cryo-TEM, we investigate the effect of fluoroethylene carbonate (FEC) additive on the solid electrolyte interphase (SEI) structure of a Na-metal electrode. Without FEC, the NaPF6-containing carbonate-based electrolyte reacts with the metal electrode to produce an unstable SEI, rich in Na2CO3 and Na3PO4, which constantly consumes the sodium reservoir of the cell during cycling. When FEC is used, the Na-metal electrode forms a multilayer SEI structure comprising an outer NaF-rich amorphous phase and an inner Na3PO4 phase. This layered structure stabilizes the SEI and prevents further reactions between the electrolyte and the Na metal.

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