scholarly journals Predicting Capacity Fade in Silicon Anode-Based Li-Ion Batteries

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1448
Author(s):  
Harika Dasari ◽  
Eric Eisenbraun
Keyword(s):  
Volume Fraction ◽  
Solid Electrolyte Interphase ◽  
Lithium Ion ◽  
Current Collector ◽  
Porous Matrix ◽  
Silicon Anode ◽  
Capacity Fade ◽  
Positive Electrodes ◽  
Active Particles ◽  
Lithium Nickel Oxide

While silicon anodes hold promise for use in lithium-ion batteries owing to their very high theoretical storage capacity and relatively low discharge potential, they possess a major problem related to their large volume expansion that occurs with battery aging. The resulting stress and strain can lead to mechanical separation of the anode from the current collector and an unstable solid electrolyte interphase (SEI), resulting in capacity fade. Since capacity loss is in part dependent on the cell materials, two different electrodes, Lithium Nickel Oxide or LiNi0.8Co0.15Al0.05O2 (NCA) and LiNi1/3Mn1/3Co1/3O2 (NMC 111), were used in combination with silicon to study capacity fade effects using simulations in COMSOL version 5.5. The results of these studies provide insight into the effects of anode particle size and electrolyte volume fraction on the behavior of silicon anode-based batteries with different positive electrodes. It was observed that the performance of a porous matrix of solid active particles of silicon anode could be improved when the active particles were 150 nm or smaller. The range of optimized values of volume fraction of the electrolyte in the silicon anode were determined to be between 0.55 and 0.40. The silicon anode behaved differently in terms of cell time with NCA and NMC. However, NMC111 gave a high relative capacity in comparison to NCA and proved to be a better working electrode for the proposed silicon anode structure.

Effects of SiO2 particles in copper current collector on diffusion induced stresses in layered Li-ion battery electrodes

2021 ◽  
pp. 095440622110036
Author(s):  
Roozbeh Pouyanmehr ◽  
Morteza Pakseresht ◽  
Reza Ansari ◽  
Mohammad Kazem Hassanzadeh-Aghdam
Keyword(s):  
Volume Fraction ◽  
Lithium Ion ◽  
Current Collector ◽  
Limiting Factors ◽  
Li Ion Battery ◽  
Current Collectors ◽  
Effect Of Particle Size ◽  
Li Ion ◽  
Induced Stresses ◽  
Copper Composite

One of the limiting factors in the life of lithium-ion batteries is the diffusion-induced stresses on their electrodes that cause cracking and consequently, failure. Therefore, improving the structure of these electrodes to be able to withstand these stresses is one of the ways that can extend the life of the batteries as well as improve their safety. In this study, the effects of adding graphene nanoplatelets and microparticles into the active plate and current collectors, respectively, on the diffusion induced stresses in both layered and bilayered electrodes are numerically investigated. The micromechanical models are employed to predict the mechanical properties of both graphene nanoplatelet-reinforced Sn-based nanocomposite active plate and silica microparticle-reinforced copper composite current collector. The effect of particle size and volume fraction in the current collector on diffusion induced stresses has been studied. The results show that in electrodes with a higher volume fraction of particles and smaller particle radii, decreased diffusion induced stresses in both the active plate and the current collector are observed. These additions will also result in a significant decrease in the bending of the electrode.

scholarly journals An ultrathin ionomer interphase for high efficiency lithium anode in carbonate based electrolyte

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Yu-Ting Weng ◽  
Hao-Wen Liu ◽  
Allen Pei ◽  
FeiFei Shi ◽  
Hansen Wang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Coulombic Efficiency ◽  
Solid Electrolyte Interphase ◽  
Lithium Ion ◽  
Current Collector ◽  
High Energy ◽  
Theoretical Simulation ◽  
Polyhedral Oligosilsesquioxane ◽  
Polyether Ether Ketone ◽  
Lithium Metal Anodes

AbstractHigh coulombic efficiency and dendrite suppression in carbonate electrolytes remain challenges to the development of high-energy lithium ion batteries containing lithium metal anodes. Here we demonstrate an ultrathin (≤100 nm) lithium-ion ionomer membrane consisting of lithium-exchanged sulfonated polyether ether ketone embedded with polyhedral oligosilsesquioxane as a coating layer on copper or lithium for achieving efficient and stable lithium plating-stripping cycles in a carbonate-based electrolyte. Operando analyses and theoretical simulation reveal the remarkable ability of the ionomer coating to enable electric field homogenization over a considerably large lithium-plating surface. The membrane coating, serving as an artificial solid-electrolyte interphase filter in minimizing parasitic reactions at the electrolyte-electrode interface, enables dendrite-free lithium plating on copper with outstanding coulombic efficiencies at room and elevated (50 °C) temperatures. The membrane coated copper demonstrates itself as a promising current collector for manufacturing high-quality pre-plated lithium thin-film anode.

Micromechanisms of Capacity Fade in Silicon Anode for Lithium-Ion Batteries

2019 ◽  
Vol 41 (11) ◽  
pp. 87-99 ◽  
Author(s):  
Siladitya Pal ◽  
Sameer Damle ◽  
Siddharth Patel ◽  
M. K. Dutta ◽  
Prashant N. Kumta ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Silicon Anode ◽  
Capacity Fade

scholarly journals Capacity Fade Analysis of Lithium-Ion Cells Utilizing Uncertainty Quantification Approach

2019 ◽  
Author(s):  
Vahid Esfahanian ◽  
Saeed Akbari ◽  
Farzin Chaychizadeh ◽  
Hojat Dehghandorost
Keyword(s):  
Voltage Drop ◽  
Low Cost ◽  
Solid Electrolyte Interphase ◽  
Lithium Ion ◽  
Stochastic Approach ◽  
Internal Resistance ◽  
Constant Current ◽  
Capacity Fade ◽  
Uncertainty Sources ◽  
Lithium Ion Cells

Lithium-ion batteries (LIBs) have drawn attention in research due to their broad range of applications. To achieve low-cost and high reliable batteries, researchers have worked on a variety of degradation phenomena. Among them, the Solid Electrolyte Interphase (SEI) layer is the most important degradation phenomenon and causes the cell to capacity fade and internal resistance raise. In this paper, a stochastic approach, based on the sparse Jacobi polynomial chaos expansion, is utilized to investigate the effect of the uncertainty sources on the lithium-ion battery aging. Furthermore, the importance of every uncertainty source is calculated by using Sobol indices. Capacity fade and resistance raise obtain at the end of the Constant Current-Constant Voltage (CC-CV) charging. The outcome of this study shows the most important parameters affecting capacity fade and voltage drop.

Effect of Fluorine-Containing Additive on the Electrochemical Properties of Silicon Anode for Lithium-Ion Batteries

2019 ◽  
Vol 944 ◽  
pp. 699-704 ◽  
Author(s):  
Jing Wang ◽  
Xiao Hang Yang ◽  
Yue Feng Su ◽  
Shi Chen ◽  
Feng Wu
Keyword(s):  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Solid Electrolyte Interphase ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Silicon Anode ◽  
Cycle Stability ◽  
Promising Candidate ◽  
Sem Images ◽  
The Stability

Silicon anode is a promising candidate as an alternative to the conventional graphitic anode in lithium-ion batteries. In this work, silicon anode is modified by NH4F using a facile method in air. The concentration of NH4F on the electrochemical performance is systematically checked. The 5wt%NH4F-modified silicon anode exhibits enhanced cycle and rate performances, the first discharge specific capacity is 3958 mAh·g-1 with 86.45% as the coulombic efficiency at 0.4A·g-1. The capacity can maintain at 703.3 mAh·g-1 after 50 cycles, exhibiting a much better cycle stability than pristine silicon anode (329.9 mAh·g-1 after 50 cycles). SEM images confirm that NH4F can alleviate the volume expansion of silicon since LiF can be generated at the surface which is beneficial to the stability of solid-electrolyte interphase (SEI).

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