Theoretical Modeling of Internal Ionic Resistance Due to SEI Layer Formation in Li/S Batteries

2015 ◽  
Vol 1774 ◽  
pp. 63-68
Author(s):  
M. Behzadirad ◽  
O. Lavrova ◽  
T. Busani
Keyword(s):  
Cycling Performance ◽  
High Energy ◽  
Internal Resistance ◽  
Layer Formation ◽  
Capacity Fading ◽  
Excellent Performance ◽  
Battery Cell ◽  
Energy Applications ◽  
Electrode Degradation ◽  
Sei Layer

ABSTRACTLi/S batteries have received too much attention due to their considerable theoretical energy density suitable for high energy applications. Here, we study the consequences of the SEI layer on internal resistance of the single battery cell due to polysulfide (PS) shuttling. The growth in resistance is related to the capacity fading of the cell. Using a model of series resistors, the total internal ionic resistance over cycling performance is expressed and compared for various nanostructured cathodes at different rates. It has been shown that SEI layer is the most significant factor in increasing of ionic resistance at the beginning of the battery aging, while electrode degradation and other phenomena are dominating resistance rise over higher cycles. We also demonstrate that cathodes with smaller equivalent porosity represent an excellent performance in preventing internal resistance enhancement.

scholarly journals Improved Cycling Performance of Intermetallic Anode by Minimized SEI Layer Formation

2018 ◽  
Vol 165 (7) ◽  
pp. A1486-A1491 ◽  
Author(s):  
Hiroko Kuwata ◽  
Masaki Matsui ◽  
Hidetoshi Sonoki ◽  
Yusuke Manabe ◽  
Nobuyuki Imanishi ◽  
...  
Keyword(s):  
Cycling Performance ◽  
Layer Formation ◽  
Sei Layer

scholarly journals Interplay between electrochemical reactions and mechanical responses in silicon–graphite anodes and its impact on degradation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Junhyuk Moon ◽  
Heung Chan Lee ◽  
Heechul Jung ◽  
Shinya Wakita ◽  
Sungnim Cho ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Active Material ◽  
Cycling Performance ◽  
High Energy ◽  
Capacity Fading ◽  
Active Materials ◽  
Mechanical Responses ◽  
Subsequent Degradation ◽  
Graphite Anodes ◽  
Areal Capacity

AbstractDurability of high-energy throughput batteries is a prerequisite for electric vehicles to penetrate the market. Despite remarkable progresses in silicon anodes with high energy densities, rapid capacity fading of full cells with silicon–graphite anodes limits their use. In this work, we unveil degradation mechanisms such as Li+ crosstalk between silicon and graphite, consequent Li+ accumulation in silicon, and capacity depression of graphite due to silicon expansion. The active material properties, i.e. silicon particle size and graphite hardness, are then modified based on these results to reduce Li+ accumulation in silicon and the subsequent degradation of the active materials in the anode. Finally, the cycling performance is tailored by designing electrodes to regulate Li+ crosstalk. The resultant full cell with an areal capacity of 6 mAh cm−2 has a cycle life of >750 cycles the volumetric energy density of 800 Wh L−1 in a commercial cell format.

scholarly journals Optimized Interfaces in Anti-Perovskite Electrolyte-Based Solid-State Lithium Metal Batteries for Enhanced Performance

2021 ◽  
Vol 9 ◽  
Author(s):  
Pengcheng Yu ◽  
Yu Ye ◽  
Jinlong Zhu ◽  
Wei Xia ◽  
Yusheng Zhao
Keyword(s):  
Solid State ◽  
Cycling Performance ◽  
High Energy ◽  
Internal Resistance ◽  
Consumer Electronics ◽  
High Energy Density ◽  
Lithium Metal ◽  
Metal Anode ◽  
Lithium Metal Batteries ◽  
The Poor

Solid-state lithium metal batteries have attracted broad interest as a promising energy storage technology because of the high energy density and enhanced safety that are highly desired in the markets of consumer electronics and electric vehicles. However, there are still many challenges before the practical application of the new battery. One of the major challenges is the poor interface between lithium metal electrodes and solid electrolytes, which eventually lead to the exceptionally high internal resistance of the cells and limited output. The interface issue arises largely due to the poor contact between solid and solid, and the mechanical/electrochemical instability of the interface. In this work, an in situ “welding” strategy is developed to address the interfacial issue in solid-state batteries. Microliter-level of liquid electrolyte is transformed into an organic–inorganic composite buffer layer, offering a flexible and stable interface and promoting enhanced electrochemical performance. Symmetric lithium–metal batteries with the new interface demonstrate good cycling performance for 400 h and withstand the current density of 0.4 mA cm−2. Full batteries developed with lithium–metal anode and LiFePO4 cathode also demonstrate significantly improved cycling endurance and capacity retention.

Potassium Pre-Inserted K1.04Mn8O16 Cathode Materials for Aqueous Li-Ion and Na-Ion Hybrid Capacitors

2019 ◽  
Author(s):  
Yamin Zhang ◽  
Lina Chen ◽  
Chongyang Hao ◽  
Xiaowen Zheng ◽  
Yixuan Guo ◽  
...  
Keyword(s):  
Cycling Performance ◽  
High Energy ◽  
High Energy Density ◽  
Potassium Ions ◽  
Tunnel Structure ◽  
Hybrid Supercapacitor ◽  
Hybrid Supercapacitors ◽  
Li Ion ◽  
Power Densities ◽  
Hybrid Capacitors

For the applications of aqueous Li-ion hybrid capacitors and Na-ion hybrid capacitors, potassium ions are pre-inserted into MnO<sub>2</sub> tunnel structure, the as-prepared K<sub>1.04</sub>Mn<sub>8</sub>O<sub>16</sub> materials consist of <a>nanoparticles</a> and nanorods were prepared by facile high-temperature solid-state reaction. <a></a>The as-prepared materials were well studied andthey show outstanding electrochemical behavior. We assembled hybrid supercapacitors with commercial activated carbon (YEC-8A) as anode and K<sub>1.04</sub>Mn<sub>8</sub>O<sub>16 </sub>as cathode. It has high energy densities and power densities. Li-ion capacitors reach a high energy density of 127.61 Wh kg<sup>-1 </sup>at the power density of 99.86 W kg<sup>-1</sup> and Na-ion capacitor obtains 170.96 Wh kg<sup>-1 </sup>at 133.79 W kg<sup>-1</sup>. In addition, the <a>hybrid supercapacitor</a>s demonstrate excellent cycling performance which maintain 97 % capacitance retention for Li-ion capacitor and 85 % for Na-ion capacitor after 10,000 cycles.

scholarly journals Carbon Substitution on N24Cages: Crossover between Triangular and Hexagonal Structures

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Carrie Sanders ◽  
Douglas L. Strout
Keyword(s):  
Theoretical Calculations ◽  
High Energy ◽  
Energy Materials ◽  
Cylindrical Structures ◽  
High Energy Materials ◽  
Energy Applications ◽  
Carbon Substitution ◽  
Complex Forms ◽  
The Stability ◽  
Carbon Inclusion

Complex forms of nitrogen are of interest for their potential as high-energy materials, but many all-nitrogen systems lack the stability for practical high-energy applications. Inclusion of carbon atoms in an otherwise all-nitrogen structure can increase stability. Nitrogen cages are known for energetically preferring cylindrical structures with triangular endcaps, but carbon cages prefer the pentagon-hexagon structure of the fullerenes. Previous calculations on N22C2have shown that carbon inclusion narrows the gap between triangular and fullerene-like structures. In the current study, three isomers of N24are used as frameworks for carbon substitution. Theoretical calculations are carried out on isomers of N20C4, N18C6, and N16C8, with the goal of determining what level of carbon substitution causes the carbon fullerene-like structures to become energetically preferred.

Facile Synthesis of Uniform Carbon Coated Li2S/rGO cathode for High-Performance Lithium-Sulfur Batteries

MRS Advances ◽  
2018 ◽  
Vol 3 (60) ◽  
pp. 3501-3506 ◽  
Author(s):  
Gaind P. Pandey ◽  
Joshua Adkins ◽  
Lamartine Meda
Keyword(s):  
High Performance ◽  
Active Material ◽  
Cycling Performance ◽  
High Energy ◽  
High Energy Density ◽  
Shell Nanostructures ◽  
Lithium Sulfur Batteries ◽  
Carbon Coated ◽  
Co Precipitation ◽  
Lithium Sulfur

ABSTRACTLithium sulfide (Li2S) is one of the most attractive cathode materials for high energy density lithium batteries as it has a high theoretical capacity of 1166 mA h g-1. However, Li2S suffers from poor rate performance and short cycle life due to its insulating nature and polysulfide shuttle during cycling. In this work, we report a facile and viable approach to address these issues. We propose a method to synthesize a Li2S based nanocomposite cathode material by dissolving Li2S as the active material, polyvinylpyrrolidone (PVP) as the carbon precursor, and graphene oxide (GO) as a matrix to enhance the conductivity, followed by a co-precipitation and high-temperature carbonization process. The Li2S/rGO cathode yields an exceptionally high initial capacity of 817 mAh g-1 based on Li2S mass at C/20 rate and also shows a good cycling performance. The carbon-coated Li2S/rGO cathode demonstrates the capability of robust core-shell nanostructures for different rates and improved capacity retention, revealing carbon coated Li2S/rGO composites as an outstanding system for high-performance lithium-sulfur batteries.

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