Study and tailoring of composite and nanocomposite materials for lithium battery electrode application

2004 ◽  
Vol 856 ◽  
Author(s):  
Vincent Gaudefroy ◽  
Delphine Guy ◽  
Bernard Lestriez ◽  
Renaud Bouchet ◽  
Dominique Guyomard
Keyword(s):  
Composite Electrode ◽  
Electronic Conductivity ◽  
Active Material ◽  
Cycling Performance ◽  
Temperature Cycling ◽  
Polymeric Binder ◽  
Composite Electrodes ◽  
Standard Type ◽  
Battery Electrode ◽  
The Impact

ABSTRACTTo increase electrode cycling performance in batteries, most researchers generally focus their work on the active material optimisation. Here we show that the polymeric binder of the composite electrode may have an important role on the electrode performance. We describe a new tailored polymeric binder combination with controlled polymer-filler (carbon black) interactions that allows the preparation of new and more efficient electrode architecture. Using this polymeric binder, composite electrodes based on Li1.2V3O8 display a room-temperature cycling capacity of 280 mAh/g (C/5 rate, 3.3–2 V) instead of 150 mAh/g using a standard-type (PVdF-HFP binder) composite electrode. We have coupled SEM observations, galvanostatic cycling and electronic conductivity measurements in order to define and understand the impact of the microstructure of the composite electrode on its electrochemical performance.

Improved composite electrode and lithium battery performance From smart use of the polymers and their properties

2004 ◽  
Vol 835 ◽  
Author(s):  
Vincent Gaudefroy ◽  
Delphine Guy ◽  
Bernard Lestriez ◽  
Renaud Bouchet ◽  
Dominique Guyomard
Keyword(s):  
Room Temperature ◽  
Composite Electrode ◽  
Electronic Conductivity ◽  
Active Material ◽  
Cycling Performance ◽  
Temperature Cycling ◽  
Polymeric Binder ◽  
Composite Electrodes ◽  
Standard Type ◽  
The Impact

ABSTRACTTo increase electrode cycling performance in batteries, most researchers generally focus their work on the active material optimisation. Here we show that the polymeric binder of the composite electrode may have an important role on the electrode performance. We describe a new tailored polymeric binder combination with controlled polymer-filler (carbon black) interactions that allows the preparation of new and more efficient electrode architecture. Using this polymeric binder, composite electrodes based on Li1.2V3O8 display a room-temperature cycling capacity of 280 mAh/g (C/5 rate, 3.3–2 V) instead of 150 mAh/g using a standard-type (PVdF-HFP binder) composite electrode. We have coupled SEM observations, galvanostatic cycling and electronic conductivity measurements in order to define and understand the impact of the microstructure of the composite electrode on its electrochemical performance.

scholarly journals The Effect of Active Material, Conductive Additives, and Binder in a Cathode Composite Electrode on Battery Performance

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 658 ◽  
Author(s):  
Yoon Lee
Keyword(s):  
Composite Electrode ◽  
Electronic Conductivity ◽  
Active Material ◽  
Transition Metal Ions ◽  
Polymer Binder ◽  
Cell Performance ◽  
Side Reactions ◽  
Interfacial Resistance ◽  
Battery Capacity ◽  
Conductive Additives

The current study investigated the effects of active material, conductive additives, and binder in a composite electrode on battery performance. In addition, the parameters related to cell performance as well as side reactions were integrated in an electrochemical model. In order to predict the cell performance, key parameters including manganese dissolution, electronic conductivity, and resistance were first measured through experiments. Experimental results determined that a higher ratio of polymer binder to conductive additives increased the interfacial resistance, and a higher ratio of conductive additives to polymer binder in the electrode resulted in an increase in dissolved transition metal ions from the LiMn2O4 composite electrode. By performing a degradation simulation with these parameters, battery capacity was predicted with various fractions of constituents in the composite electrode. The present study shows that by using this integrated prediction method, the optimal ratio of constituents for a particular cathode composite electrode can be specified that will maximize battery performance.

scholarly journals Mechanical Integrity of Conductive Carbon-Black-Filled Aqueous Polymer Binder in Composite Electrode for Lithium-Ion Battery

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1460
Author(s):  
Kehua Peng ◽  
Yaolong He ◽  
Hongjiu Hu ◽  
Shufeng Li ◽  
Bao Tao
Keyword(s):  
Carbon Black ◽  
Composite Electrode ◽  
Mechanical Stability ◽  
Critical Role ◽  
Active Material ◽  
Mechanical Damage ◽  
Lithium Ion ◽  
Spherical Particles ◽  
Inorganic Filler ◽  
Composite Electrodes

The mechanical stability of aqueous binder and conductive composites (BCC) is the basis of the long-term service of composite electrodes in advanced secondary batteries. To evaluate the stress evolution of BCC in composite electrodes during electrochemical operation, we established an electrochemical–mechanical model for multilayer spherical particles that consists of an active material and a solid-electrolyte-interface (SEI)-enclosed BCC. The lithium-diffusion-induced stress distribution was studied in detail by coupling the influence of SEI and the viscoelasticity of inorganic-filler-doped polymeric bonding material. It was found that tensile hoop stress plays a critical role in determining whether a composite electrode is damaged or not—and circumferential cracks may primarily initiate in BCC, rather than in other electrode components. Further, the peak tensile stress of BCC is at the interface with SEI and does not occur at full lithiation due to the relaxation nature of polymer composite. Moreover, mechanical damage would be greatly misled if neglecting the existence of SEI. Finally, the structure integrity of the binder and conductive system can be effectively improved by (1) increasing the carbon black content as much as possible in the context of meeting cell capacity requirements—it is greater than 27% and 50% for sodium alginate and the mixtures of carboxy styrene butadiene latex and sodium carboxymethyl cellulose, respectively, for composite graphite anode; (2) reducing the elastic modulus of SEI to less than that of BCC; (3) decreasing the lithiation rate.

scholarly journals A Model for Investigating Sources of Li-Ion Battery Electrode Heterogeneity:Part II. Active Material Size, Shape, Orientation, and Stiffness

2021 ◽  
Author(s):  
Mojdeh Nikpour ◽  
Brian A Mazzeo ◽  
Dean Wheeler
Keyword(s):  
Young’S Modulus ◽  
Electronic Transport ◽  
Young's Modulus ◽  
Electronic Conductivity ◽  
Active Material ◽  
Ionic Transport ◽  
Material Particle ◽  
Active Particles ◽  
Battery Electrode ◽  
Multi Phase

Abstract This work is the extension of our previous paper [Nikpour et al., J. Electrochem. Soc. 168 060547, 2021] which introduced the multi-phase smoothed particle (MPSP) model. This model was used to simulate the evolution of the microstructure during the drying and calendering manufacturing processes of four different electrodes. The MPSP model uses particle properties to predict overall film properties such as conductivities and elastic moduli and is validated by multiple experiments. In this work the model is used to investigate the effects of active material particle size, shape, orientation, and stiffness on graphitic anodes. The model predicts that smaller active particles produce higher calendered film density, electronic conductivity, MacMullin number, and Young’s modulus, as compared to larger active particles. Rod-shaped active materials have greater ionic transport and lower electronic transport compared to the disk and sphere shapes, which have similar transport properties. During calendering, disk-shaped particles tend to be oriented horizontally, which decreases through-plane ionic transport. Increasing the stiffness of the active material increases film porosity and composite Young’s modulus, while lowering electronic transport and increasing ionic transport.

Heat-Treated Fe3O4 - Activated Carbon Nanocomposite for High Performance Electrochemical Capacitor

2014 ◽  
Vol 894 ◽  
pp. 349-354 ◽  
Author(s):  
M.Y. Ho ◽  
Poi Sim Khiew
Keyword(s):  
Activated Carbon ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Diffusion Mechanism ◽  
Electronic Conductivity ◽  
Treatment Temperature ◽  
Constant Current ◽  
Composite Electrodes ◽  
The Impact ◽  
Carbon Nanocomposite

The impact of heat treatment temperature on the electrochemical performance of Fe3O4-activated carbon nanocomposite electrodes was investigated using constant current charge-discharge and Electrochemical Impedance Spectroscopy (EIS). An improved capacitive behaviour was observed due to the effect of enhanced ionic and electronic conductivities of the 4 wt% Fe3O4/AC by thermally heating at 200 °C for 6 hours. It was found that the internal resistance of 4 wt% Fe3O4/AC composite electrode calcined at 200 °C for 6 hours is the smallest (2.97 Ω) in comparison to those untreated (4.36 Ω) composite electrodes. The ion mobility inside the porous composite electrodes is favourable at 200 °C, accompanying with the enhanced electronic conductivity of oxide electrode as a result of improved crystallinity. The EIS results and analysis not only have significant impact on the fundamental understanding of the temperature-dependent structural and electrochemical properties of electrode but also provide the insights on the diffusion mechanism of the nanocomposite in neutral Na2SO3electrolyte.

scholarly journals Electrochemical Performance of Thick-Film Li(Ni0.6Mn0.2Co0.2)O2 Cathode with Hierarchic Structures and Laser Ablation

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2962
Author(s):  
Zelai Song ◽  
Penghui Zhu ◽  
Wilhelm Pfleging ◽  
Jiyu Sun
Keyword(s):  
Thin Film ◽  
Particle Size ◽  
Laser Ablation ◽  
Electrochemical Performance ◽  
Thick Film ◽  
Active Material ◽  
Lithium Ion ◽  
Particle Morphology ◽  
Composite Electrodes ◽  
The Impact

The electrochemical performance of lithium-ion batteries is directly influenced by type of active material as well as its morphology. In order to evaluate the impact of particle morphology in thick-film electrodes, Li(Ni0.6Mn0.2Co0.2)O2 (NMC 622) cathodes with bilayer structure consisting of two different particle sizes were manufactured and electrochemically characterized in coin cells design. The hierarchical thick-film electrodes were generated by multiple casting using NMC 622 (TA) with small particle size of 6.7 µm and NMC 622 (BA) with large particle size of 12.8 µm. Besides, reference electrodes with one type of active material as well as with two type of materials established during mixing process (BT) were manufactured. The total film thickness of all hierarchical composite electrodes were kept constant at 150 µm, while the thicknesses of TA and BA were set at 1:2, 1:1, and 2:1. Meanwhile, three kinds of thin-film cathodes with 70 µm were applied to represent the state-of-the-art approach. Subsequently, ultrafast laser ablation was applied to generate groove structures inside the electrodes. The results demonstrate that cells with thin-film or thick-film cathode only containing TA, cells with bilayer electrode containing TBA 1:2, and cells with laser-structured electrodes show higher capacity at C/2 to 5C, respectively.

scholarly journals Machine Learning-Based on Assessment of the Impact of the Manufacturing Process on Battery Electrode Heterogeneity

Energy and AI ◽  
2021 ◽  
pp. 100090
Author(s):  
Marc Duquesnoy ◽  
Iker Boyano ◽  
Larraitz Ganborena ◽  
Pablo Cereijo ◽  
Elixabete Ayerbe ◽  
...  
Keyword(s):  
Machine Learning ◽  
Manufacturing Process ◽  
Battery Electrode ◽  
The Impact

Probing the morphological influence on solid electrolyte interphase and impedance response in intercalation electrodes

2015 ◽  
Vol 17 (15) ◽  
pp. 9812-9827 ◽  
Author(s):  
Chien-Fan Chen ◽  
Partha P. Mukherjee
Keyword(s):  
Solid Electrolyte ◽  
Solid Electrolyte Interphase ◽  
Active Material ◽  
Impedance Model ◽  
Impedance Response ◽  
Intercalation Electrodes ◽  
The Impact

The microstructure-aware impedance model allows for the impact of active material morphology on the SEI formation and corresponding impedance response.

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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