Tina Taskovic
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View article: Dicarbonate Compounds as Electrolyte Solvents for Li-ion Cell Operation
Dicarbonate Compounds as Electrolyte Solvents for Li-ion Cell Operation Open
Novel dicarbonate compounds were explored as a new class of electrolyte solvents for Li-ion batteries. Dimethyl-2,5-dioxahexane carboxylate (DMOHC) has been shown to be a high viscosity solvent that provides exceptional lifetime for Li-ion…
View article: Limitations of Li-Ion Pouch Cells for Accelerated Testing and Long-Lifetime Cells
Limitations of Li-Ion Pouch Cells for Accelerated Testing and Long-Lifetime Cells Open
Li-ion pouch cells that have experienced long-term accelerated testing at extreme temperatures have exhibited electrolyte permeation through the seals of the pouch bag, leading to eventual cell failure due to electrolyte unwetting and impe…
View article: An Investigation of Li-Ion Cell Degradation Caused by Simulated Autoclave Cycles
An Investigation of Li-Ion Cell Degradation Caused by Simulated Autoclave Cycles Open
Li[Ni 0.6 Mn 0.4 Co 0.0 ]O 2 /graphite (NMC640, balanced for 4.1 V cut-off) and Li[Ni 0.83 Mn 0.06 Co 0.11 ]O 2 /graphite (Ni83, balanced for 4.06 V cut-off) pouch cells were tested using lab-simulated autoclave conditions. After every cyc…
View article: Exceptional Performance of Li-ion Battery Cells with Liquid Electrolyte at 100 °C
Exceptional Performance of Li-ion Battery Cells with Liquid Electrolyte at 100 °C Open
Single crystal NMC640/artificial graphite cells balanced for low voltage operation (≤4.1 V) and using electrolyte salts rich in lithium bis(fluorosulfonyl)imide are demonstrated to have exceptional lifetime during continuous operation at 1…
View article: Alkyl Dicarbonates, Common Electrolyte Degradation Products, Can Enable Long-Lived Li-Ion Cells at High Temperatures
Alkyl Dicarbonates, Common Electrolyte Degradation Products, Can Enable Long-Lived Li-Ion Cells at High Temperatures Open
A common degradation product dimethyl-2,5-dioxahexane carboxylate (DMOHC) produced in Li-ion cell electrolytes after ageing is used here as an electrolyte solvent, allowing Li-ion cells to operate at high temperatures (70 °C and 85 °C) wit…
View article: Identification of Redox Shuttle Generated in LFP/Graphite and NMC811/Graphite Cells
Identification of Redox Shuttle Generated in LFP/Graphite and NMC811/Graphite Cells Open
Unwanted self-discharge of LFP/AG and NMC811/AG cells can be caused by in situ generation of a redox shuttle molecule after formation at elevated temperature with common alkyl carbonate electrolyte. This study investigates the redox shuttl…
View article: Low-Voltage Operation and Lithium Bis(fluorosulfonyl)imide Electrolyte Salt Enable Long Li-Ion Cell Lifetimes at 85 °C
Low-Voltage Operation and Lithium Bis(fluorosulfonyl)imide Electrolyte Salt Enable Long Li-Ion Cell Lifetimes at 85 °C Open
LiFePO 4 /graphite (LFP), Li[Ni 0.5 Mn 0.3 Co 0.2 ]O 2 /graphite (NMC3.8 V, balanced for 3.8 V cut-off), and Li[Ni 0.83 Mn 0.06 Co 0.11 ]O 2 /graphite (Ni83, balanced for 4.06 V cut-off) cells were tested at 85 °C. Three strategies were us…
View article: Lithium Difluoro(dioxalato) Phosphate as an Electrolyte Additive for NMC811/Graphite Li-ion Pouch Cells
Lithium Difluoro(dioxalato) Phosphate as an Electrolyte Additive for NMC811/Graphite Li-ion Pouch Cells Open
Lithium difluoro(dioxalato)phosphate (LiDFDOP) has been systemically studied as an electrolyte additive singly and in combination with co-additives fluoroethylene carbonate (FEC) and vinylene carbonate (VC) in LiNi 0.8 Mn 0.1 Co 0.1 O 2 (N…
View article: Improved Li-Ion Cell Construction and Usage Scheme for Achieving Operation Beyond End-of-Life
Improved Li-Ion Cell Construction and Usage Scheme for Achieving Operation Beyond End-of-Life Open
Lithium-ion batteries will contribute to the energy storage needs that will enable the widespread implementation of renewable energy alternatives to fossil fuels. Here the role of cell lifetime in achieving sufficient battery deployment to…
View article: Lessons Learned from Long-Term Cycling Experiments with Pouch Cells with Li-Rich and Mn-Rich Positive Electrode Materials
Lessons Learned from Long-Term Cycling Experiments with Pouch Cells with Li-Rich and Mn-Rich Positive Electrode Materials Open
In this work, the performance of commercial (250–300 mAh) Li 1.11 Ni 0.34 Mn 0.53 Al 0.02 O 2 /graphite (LNMA) and Li 1.167 Ni 0.183 Mn 0.558 Co 0.092 O 2 /graphite (LNMC) pouch cells was evaluated using different cycling drive profiles, t…
View article: High Temperature Testing of NMC/Graphite Cells for Rapid Cell Performance Screening and Studies of Electrolyte Degradation
High Temperature Testing of NMC/Graphite Cells for Rapid Cell Performance Screening and Studies of Electrolyte Degradation Open
LiNi 0.5 Mn 0.3 Co 0.2 O 2 /graphite cells with two different electrolytes underwent charge-discharge cycling at 70 °C. The 70 °C condition reduced the time it took for cells to lose significant capacity. Studies of the changes to the elec…
View article: Investigation of Redox Shuttle Generation in LFP/Graphite and NMC811/Graphite Cells
Investigation of Redox Shuttle Generation in LFP/Graphite and NMC811/Graphite Cells Open
Unwanted redox shuttles can lead to self-discharge and inefficiency in lithium-ion cells. This study investigates the generation of a redox shuttle in LFP/graphite and NMC811/graphite pouch cells with common alkyl carbonate electrolyte. Vi…
View article: Study of Electrolyte and Electrode Composition Changes vs Time in Aged Li-Ion Cells
Study of Electrolyte and Electrode Composition Changes vs Time in Aged Li-Ion Cells Open
Many studies of Li-ion cells examine compositional changes to electrolyte and electrodes to determine desirable or undesirable reactions that affect cell performance. Cells involved in these studies typically have a limited test lifetime d…
View article: Optimizing Electrolyte Additive Loadings in NMC532/Graphite Cells: Vinylene Carbonate and Ethylene Sulfate
Optimizing Electrolyte Additive Loadings in NMC532/Graphite Cells: Vinylene Carbonate and Ethylene Sulfate Open
A matrix of LiNi 0.5 Mn 0.3 Co 0.2 O 2 /graphite cells filled with 1.33 molal LiPF 6 in EC:EMC:DMC (ethylene carbonate: ethyl methyl carbonate: dimethyl carbonate) (25:5:70 by volume) electrolyte and different weight percentages of vinylen…
View article: Hot Formation for Improved Low Temperature Cycling of Anode-Free Lithium Metal Batteries
Hot Formation for Improved Low Temperature Cycling of Anode-Free Lithium Metal Batteries Open
A new "hot formation" protocol is proposed to improve lower temperature cycling of lithium metal batteries. The cycling stability of anode-free pouch cells under low pressure (75 kPa) is shown to decline significantly as the cycling temper…
View article: A Joint DFT and Experimental Study of an Imidazolidinone Additive in Lithium-Ion Cells
A Joint DFT and Experimental Study of an Imidazolidinone Additive in Lithium-Ion Cells Open
Electrolyte additives are a practical route to improving the lifetime and performance of lithium-ion cells. It is not well understood what makes a good additive; thus, the discovery of new additives poses a significant challenge. Computati…