Design Considerations to Improve Transport in Porous Electrodes for Lithium-Ion Batteries

2012 ◽  
Vol 1440 ◽  
Author(s):  
Rajeswari Chandrasekaran ◽  
Andrew Drews ◽  
Apoorv Shaligram ◽  
Jeffrey Sakamoto
Keyword(s):  
Transport Properties ◽  
Lithium Ion Batteries ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Porous Electrodes ◽  
Design Considerations ◽  
Lithium Ion Cells ◽  
Effective Transport ◽  
The Relationship

ABSTRACTThe relationship between tortuosity and porosity and its influence on effective transport properties in lithium-ion cells was analyzed. The variation in cell performance with changes in component thicknesses, porosities and tortuosities was investigated. Optimal, novel electrode designs are developed to improve their rate capability even at higher active material loadings.

scholarly journals Porous Polymer Gel Electrolytes Influence Lithium Transference Number and Cycling in Lithium-Ion Batteries

2021 ◽  
Vol 2 (2) ◽  
pp. 154-173
Author(s):  
Buket Boz ◽  
Hunter O. Ford ◽  
Alberto Salvadori ◽  
Jennifer L. Schaefer
Keyword(s):  
Transport Properties ◽  
Lithium Ion Batteries ◽  
Polymer Electrolyte ◽  
Active Material ◽  
Polymer Network ◽  
Rate Capability ◽  
Lithium Ion ◽  
Transference Number ◽  
Porous Polymer ◽  
Performance Property

To improve the energy density of lithium-ion batteries, the development of advanced electrolytes with enhanced transport properties is highly important. Here, we show that by confining the conventional electrolyte (1 M LiPF6 in EC-DEC) in a microporous polymer network, the cation transference number increases to 0.79 while maintaining an ionic conductivity on the order of 10−3 S cm−1. By comparison, a non-porous, condensed polymer electrolyte of the same chemistry has a lower transference number and conductivity, of 0.65 and 7.6 × 10−4 S cm−1, respectively. Within Li-metal/LiFePO4 cells, the improved transport properties of the porous polymer electrolyte enable substantial performance enhancements compared to a commercial separator in terms of rate capability, capacity retention, active material utilization, and efficiency. These results highlight the importance of polymer electrolyte structure–performance property relationships and help guide the future engineering of better materials.

Novel Cathode Electrode with Superior Rate Capability Using Perforated Aluminum Current Collector for Lithium-Ion Batteries

2020 ◽  
Vol 12 (10) ◽  
pp. 1465-1468
Author(s):  
Jin-Ju Bae ◽  
Ji-Woong Shin ◽  
Seong-Jae Kim ◽  
Tae-Whan Hong
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Performance Indicators ◽  
Rate Capability ◽  
Lithium Ion ◽  
Current Collector ◽  
Aluminum Foil ◽  
Cathode Electrode ◽  
The Relationship

Electrodes were fabricated using a perforated aluminum current collector and a standard aluminum foil, and the relationship between the electrochemical performance of the battery and the current collector was investigated. The perforated aluminum foil improved the contact characteristics between the cathode materials particles and the current collector. Also, electrochemical performance indicators such discharge capacity and rate characteristics were improved due to the increased adhesion of the electrode using the perforated current collector.

scholarly journals Utilizing the Intrinsic Thermal Instability of Swedenborgite Structured YBaCo4O7+δ as an Opportunity for Material Engineering in Lithium-Ion Batteries by Er and Ga Co-Doping Processes

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4565
Author(s):  
Sanghyuk Park ◽  
Kwangho Park ◽  
Ji-Seop Shin ◽  
Gyeongbin Ko ◽  
Wooseok Kim ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Phase Stability ◽  
Electrochemical Impedance ◽  
Coulombic Efficiency ◽  
Structural Phase ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Ion Migration ◽  
Co Doping

We firstly introduce Er and Ga co-doped swedenborgite-structured YBaCo4O7+δ (YBC) as a cathode-active material in lithium-ion batteries (LIBs), aiming at converting the phase instability of YBC at high temperatures into a strategic way of enhancing the structural stability of layered cathode-active materials. Our recent publication reported that Y0.8Er0.2BaCo3.2Ga0.8O7+δ (YEBCG) showed excellent phase stability compared to YBC in a fuel cell operating condition. By contrast, the feasibility of the LiCoO2 (LCO) phase, which is derived from swedenborgite-structured YBC-based materials, as a LIB cathode-active material is investigated and the effects of co-doping with the Er and Ga ions on the structural and electrochemical properties of Li-intercalated YBC are systemically studied. The intrinsic swedenborgite structure of YBC-based materials with tetrahedrally coordinated Co2+/Co3+ are partially transformed into octahedrally coordinated Co3+, resulting in the formation of an LCO layered structure with a space group of R-3m that can work as a Li-ion migration path. Li-intercalated YEBCG (Li[YEBCG]) shows effective suppression of structural phase transition during cycling, leading to the enhancement of LIB performance in Coulombic efficiency, capacity retention, and rate capability. The galvanostatic intermittent titration technique, cyclic voltammetry and electrochemical impedance spectroscopy are performed to elucidate the enhanced phase stability of Li[YEBCG].

scholarly journals Characterization and Laser Structuring of Aqueous Processed Li(Ni0.6Mn0.2Co0.2)O2 Thick-Film Cathodes for Lithium-Ion Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1840
Author(s):  
Penghui Zhu ◽  
Jiahao Han ◽  
Wilhelm Pfleging
Keyword(s):  
Acetic Acid ◽  
Lithium Ion Batteries ◽  
Thick Film ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Ph Values ◽  
Laser Structuring ◽  
Methyl Pyrrolidone ◽  
High Processing

Lithium-ion batteries have led the revolution in portable electronic devices and electrical vehicles due to their high gravimetric energy density. In particular, layered cathode material Li(Ni0.6Mn0.2Co0.2)O2 (NMC 622) can deliver high specific capacities of about 180 mAh/g. However, traditional cathode manufacturing involves high processing costs and environmental issues due to the use of organic binder polyvinylidenfluoride (PVDF) and highly toxic solvent N-methyl-pyrrolidone (NMP). In order to overcome these drawbacks, aqueous processing of thick-film NMC 622 cathodes was studied using carboxymethyl cellulose and fluorine acrylic hybrid latex as binders. Acetic acid was added during the mixing process to obtain slurries with pH values varying from 7.4 to 12.1. The electrode films could be produced with high homogeneity using slurries with pH values smaller than 10. Cyclic voltammetry measurements showed that the addition of acetic acid did not affect the redox reaction of active material during charging and discharging. Rate capability tests revealed that the specific capacities with higher slurry pH values were increased at C-rates above C/5. Cells with laser structured thick-film electrodes showed an increase in capacity by 40 mAh/g in comparison to cells with unstructured electrodes.

MoS2 Layers Decorated RGO Composite Prepared by a One-Step High-Temperature Solvothermal Method as Anode for Lithium-Ion Batteries

NANO ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. 1850135 ◽  
Author(s):  
Xuehua Liu ◽  
Bingning Wang ◽  
Jine Liu ◽  
Zhen Kong ◽  
Binghui Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Ion Batteries ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cost Effective ◽  
Reversible Capacity ◽  
Reduced Graphene ◽  
One Step ◽  
Anode Active Material

A one-step high-temperature solvothermal approach to the synthesis of monolayer or bilayer MoS2 anchored onto reduced graphene oxide (RGO) sheet (denoted as MoS2/RGO) is described. It was found that single-layered or double-layered MoS2 were synthesized directly without an extra exfoliation step and well dispersed on the surface of crumpled RGO sheets with random orientation. The prepared MoS2/RGO composites delivered a high reversible capacity of 900[Formula: see text]mAhg[Formula: see text] after 200 cycles at a current density of 200[Formula: see text]mAg[Formula: see text] as well as good rate capability as anode active material for lithium ion batteries. This one-step high-temperature hydrothermal strategy provides a simple, cost-effective and eco-friendly way to the fabrication of exfoliated MoS2 layers deposited onto RGO sheets.

scholarly journals The Effect of Silicon Grade and Electrode Architecture on the Performance of Advanced Anodes for Next Generation Lithium-Ion Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3448
Author(s):  
Alexandra Meyer ◽  
Fabian Ball ◽  
Wilhelm Pfleging
Keyword(s):  
Electrochemical Impedance ◽  
Active Material ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Composite Electrodes ◽  
Counter Electrodes ◽  
Transfer Resistance ◽  
Graphite Composite ◽  
Lithium Ion Cells

To increase the specific capacity of anodes for lithium-ion cells, advanced active materials, such as silicon, can be utilized. Silicon has an order of magnitude higher specific capacity compared to the state-of-the-art anode material graphite; therefore, it is a promising candidate to achieve this target. In this study, different types of silicon nanopowders were introduced as active material for the manufacturing of composite silicon/graphite electrodes. The materials were selected from different suppliers providing different grades of purity and different grain sizes. The slurry preparation, including binder, additives, and active material, was established using a ball milling device and coating was performed via tape casting on a thin copper current collector foil. Composite electrodes with an areal capacity of approximately 1.70 mAh/cm² were deposited. Reference electrodes without silicon were prepared in the same manner, and they showed slightly lower areal capacities. High repetition rate, ultrafast laser ablation was applied to these high-power electrodes in order to introduce line structures with a periodicity of 200 µm. The electrochemical performance of the anodes was evaluated as rate capability and operational lifetime measurements including pouch cells with NMC 622 as counter electrodes. For the silicon/graphite composite electrodes with the best performance, up to 200 full cycles at a C-rate of 1C were achieved until end of life was reached at 80% relative capacity. Additionally, electrochemical impedance spectroscopies were conducted as a function of state of health to correlate the used silicon grade with solid electrolyte interface (SEI) formation and charge transfer resistance values.

Excellent rate capability and cycling stability in Li+-conductive Li2SnO3-coated LiNi0.5Mn1.5O4 cathode materials for lithium-ion batteries

2018 ◽  
Vol 47 (20) ◽  
pp. 7020-7028 ◽  
Author(s):  
Jirong Mou ◽  
Yunlong Deng ◽  
Zhicui Song ◽  
Qiaoji Zheng ◽  
Kwok Ho Lam ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Power Density ◽  
High Voltage ◽  
Cathode Materials ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Side Reactions ◽  
Capacity Fading

High-voltage LiNi0.5Mn1.5O4 is a promising cathode candidate for lithium-ion batteries (LIBs) due to its considerable energy density and power density, but the material generally undergoes serious capacity fading caused by side reactions between the active material and organic electrolyte.

Soft-templated LiFePO4/mesoporous carbon nanosheets (LFP/meso-CNSs) nanocomposite as the cathode material of lithium ion batteries

RSC Advances ◽  
2014 ◽  
Vol 4 (41) ◽  
pp. 21325-21331 ◽  
Author(s):  
Ruofei Wu ◽  
Guofeng Xia ◽  
Shuiyun Shen ◽  
Fengjuan Zhu ◽  
Fengjing Jiang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Mesoporous Carbon ◽  
Electronic Conductivity ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Carbon Nanosheets ◽  
High Electronic Conductivity ◽  
Nano Size

A soft-templated LFP/mesoporous carbon nanosheets (LFP/meso-CNSs) nanocomposite as the cathode of lithium ion batteries displays an excellent high-rate capability and stable cycling property, benefitting from its high electronic conductivity, open mesoporosity, and the nano-size of its active material.

A SnO2@carbon nanocluster anode material with superior cyclability and rate capability for lithium-ion batteries

Nanoscale ◽  
2013 ◽  
Vol 5 (8) ◽  
pp. 3298 ◽  
Author(s):  
Min He ◽  
Lixia Yuan ◽  
Xianluo Hu ◽  
Wuxing Zhang ◽  
Jie Shu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Rate Capability ◽  
Lithium Ion
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