Factors that Affect Capacity in the Low Voltage Kinetic Hindrance Region of Ni-Rich Positive Electrode Materials and Diffusion Measurements from a Reinvented Approach
This work highlights the impact of various material parameters on electrochemical performances, specifically the kinetic hindrances to Li diffusion in the low voltage region.
High Precision Coulometry Studies of Single-Phase Layered Compositions in the Li-Mn-Ni-O System
Reactions with electrolyte can be detected using precise measurements of coulombic efficiency (CE) and charge end point capacity slippage. Three single-phase layered compositions in the Li-Mn-Ni-O system...
The Electrochemical Society, find out more Ultra High Precision Study on High Capacity Cells for Large Scale Automotive Application
Three nominally identical cohorts of NMC/graphite automotive Li-ion cells aged zero, one, and two years were obtained from an automotive Li-ion cell producer. The aged cells were stored at 50% state of charge at room temperature without cycling.
Variation of coulombic efficiency versus upper cutoff potential of Li-ion cells tested with aggressive protocols
Three different cycling protocols including “continuous-cycling”, “barn-charge” and “cycle-store” were applied with an ultra high precision charger to Li[Ni0.42Mn0.42Co0.16]O2/graphite and/or Li[Ni1/3Mn1/3Co1/3]O2/graphite pouch cells tested using different upper cutoff potentials.
Synthesis and Evaluation of Difluorophosphate Salt Electrolyte Additives for Lithium-Ion Batteries
The electrolyte additive lithium difluorophosphate improves the lifetime of lithium-ion cells. This work presents the synthesis and evaluation of alternative difluorophosphate salt electrolyte additives
Performance and Degradation of LiFePO4/Graphite Cells: The Impact of Water Contamination and an Evaluation of Common Electrolyte Additives
In this work the performance of LFP/graphite cells is tested at various temperatures and cycling protocols. The amount of water contamination is controlled to study the impact of water on capacity fade in LFP.
A High Precision Study of the Effect of Vinylene Carbonate (VC) Additive in Li/Graphite Cells
Li/graphite coin cells containing different amounts of vinylene carbonate (VC) electrolyte additive were examined at different temperatures using the High Precision Charger at Dalhousie University.
Impedance Reducing Additives and Their Effect on Cell Performance: II. C3H9B3O6
Wound Li/Graphite cells were studied using the High Precision Charger at Dalhousie University, automated cycling/storage, AC impedance and long-term cycling at elevated temperature.
Editors’ Choice—Hindering Rollover Failure of Li[Ni 0.5 Mn 0.3 Co 0.2 ]O 2 /Graphite Pouch Cells during Long-Term Cycling
Eventual rapid capacity loss or "rollover" failure of lithium-ion cells during long-term cycling (>3000 cycles in many cases) at room temperature was studied with Li[Ni0.5Mn0.3Co0.2]O2/graphite pouch cells.
A Baseline Kinetic Study of Co-Free Layered Li 1+x (Ni 0.5 Mn 0.5 ) 1−x O 2 Positive Electrode Materials for Lithium-Ion Batteries
Variations of Li chemical diffusion coefficient (${D}_{c}$) with voltage in a series of Co-free Li1+x(Ni0.5Mn0.5)1−xO2, 0 ≤ x ≤ 0.12, materials were systematically investigated using the recently developed "Atlung Method for Intercalant Diffusion".
