Delayed Rapid Anode Potential Decrease During Fixed Resistive Load Overdischarge of LiFePO<sub>4</sub>/Graphite Lithium-Ion Cells

Crompton, K. R.

doi:10.1149/1945-7111/ab8730

Cited by 5 publications

(3 citation statements)

References 60 publications

(116 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the anode capacity stabilizes after cycle 5 for the Ge–Al anode, the average columbic efficiency is ∼99% which would lead to continuous lithium inventory loss in a full cell during charge and discharge. Prelithiation methods to increase lithium inventory and manage the irreversible loss ,,− can manage first-cycle loss and prevent full cell capacity fade due to anode coulombic efficiencies of <100%, but only until the cell discharge capacity becomes limited by lithium inventory. ,, …”

Section: Resultsmentioning

confidence: 99%

Analysis of Germanium Nanoparticle Composites with an Aluminum Current Collector toward Li-ion Battery Anodes with High Capacity and Broad Potential Stability Range

Crompton¹,

Hladky²

2021

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

Reduction reactions with lithium at >0.3 V vs Li/Li + make germanium prospectively compatible with aluminum current collectors to form a copper-free lithium-ion cell anode that may enable lithium-ion cells that are more tolerant to overdischarge. Targeted 2.0 mAh/cm 2 germanium nanoparticle electrodes with an aluminum foil (Ge−Al electrode) current collector were fabricated and tested versus lithium from 0.3 to 1.5 V vs Li/Li + in 1.0 M LiPF 6 1:1 ethylene carbonate/diethyl carbonate (v/v) electrolyte and demonstrated a peak reversible capacity of 342 mAh/g Ge at a targeted C/10 rate. A targeted 2.0 mAh/cm 2 germanium nanoparticle electrode with a copper current collector (Ge−Cu electrode) was also tested from 0.005 to 1.5 V vs Li/Li + , the results of which are utilized as a representative comparison of germanium tested in a conventional lithium-ion anode potential range. Compared to the Ge−Cu electrode, after 50 cycles at a targeted C/10 rate the Ge−Al electrode showed 90% vs 18% capacity retention. Post-mortem analysis with XPS, SEM/EDS, Raman spectroscopy, and FTIR showed that compared to the Ge−Cu electrode the Ge−Al electrode had (1) less oxygen, fluorine, and carbon deposition, (2) less germanium amorphization, (3) formation of Li x C y and Ge−H, and (4) less Li 2 O formation. After 150 cycles at equivalent targeted rates, the Ge−Al electrode also had significantly less mid-frequency impedance growth than the Ge−Cu electrode. Modeling of 18650 format LiNiCoAlO 2 -cathode lithium-ion cells with a Ge−Al anode predicted an achievable energy density and specific energy of up to 491 Wh/L and 198 Wh/kg. A germanium dissolution potential of 4.2 V vs Li/Li + was assigned based on voltammetry and post-mortem SEM/EDS. Cycling of a Ge−Al electrode with an upper potential cutoff of 4.2 V vs Li/Li + every tenth cycle showed 30% capacity retention after 50 cycles, an increased capacity fade attributed to solid electrolyte interphase instability up to 4.2 V vs Li/Li + based on impedance and post-mortem analysis.

show abstract

Section: Resultsmentioning

confidence: 99%

Analysis of Germanium Nanoparticle Composites with an Aluminum Current Collector toward Li-ion Battery Anodes with High Capacity and Broad Potential Stability Range

Crompton¹,

Hladky²

2021

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Stage I included the first five cycles wherein the discharge capacity gradually increased, reaching a maximum discharge capacity of 2.867 Ah. The discharge capacity increased at a rate of approximately 19.5%, implying an increase in the rate at which active lithium ions were released [19]. During Stage II, i.e., from the 6th to 55th cycles, the discharge capacity began to decay, following an approximately linear trend.…”

Section: Discharge Capacitymentioning

confidence: 97%

Effect of High-Rate Cycle Aging and Over-Discharge on NCM811 (LiNi0.8Co0.1Mn0.1O2) Batteries

Yin

Jia

et al. 2022

Energies

View full text Add to dashboard Cite

Inconsistencies in a monomer battery pack can lead to the over-discharge of a single battery. Although deep over-discharge can be avoided by optimizing the battery control system, slight over-discharge still often occurs in the battery pack. The aging behavior of cylindrical NCM811 batteries under high-rate aging and over-discharge was studied. By setting the end-of-discharge of 1 V, the battery capacity rapidly decayed after 130 cycles. Additionally, the temperature sharply increased in the over-discharge stage. The micro short-circuit was found by the discharge voltage curve and impedance spectrum. Batteries with 100%, 79.6% and 50.9% SOH (state of health = Q_now/Q_new × 100%) as a result of high-rate aging and over-discharging were subjected to thermal testing in an adiabatic environment. The battery without high-rate aging and over-discharge did not experience thermal runaway. However, severe thermal runaway occurred in the 79.6% and 50.9% SOH batteries. Regarding the cyclic aging of the 50.9% SOH battery, the fusion temperature of the separator decreased by 22.3 °C, indicating a substantial degradation of the separator and thus reducing battery safety. Moreover, the results of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses revealed that the particles of the positive material were broken and detached, and that large-area cracks and delamination had formed on the negative material. Furthermore, Ni deposition and the uneven deposition of P and F on the negative surface were observed, which increased the risk of short-circuit in the battery. Positive and negative materials were attached on both sides of the separator, which reduced the effective area of ionic transportation.

show abstract

“…The last lower energy contribution for the P 2p orbital could be attributed to polyphosphates. 26 The origin of this compound in our system remains to be determined, though it could be related to the reaction of the electrolyte salt with the CMC of the electrode.…”

Section: Sei Composition Aer Formationmentioning

confidence: 98%

Study of the influence of the formation protocol on the SEI layer formed at the graphite electrode surface of a non-aqueous potassium-ion hybrid supercapacitor (KIC) through STEM and XPS analyses

Yvenat

Chavillon

Mayousse

et al. 2023

Sustainable Energy Fuels

View full text Add to dashboard Cite

show abstract

Delayed Rapid Anode Potential Decrease During Fixed Resistive Load Overdischarge of LiFePO₄/Graphite Lithium-Ion Cells

Cited by 5 publications

References 60 publications

Analysis of Germanium Nanoparticle Composites with an Aluminum Current Collector toward Li-ion Battery Anodes with High Capacity and Broad Potential Stability Range

Analysis of Germanium Nanoparticle Composites with an Aluminum Current Collector toward Li-ion Battery Anodes with High Capacity and Broad Potential Stability Range

Effect of High-Rate Cycle Aging and Over-Discharge on NCM811 (LiNi0.8Co0.1Mn0.1O2) Batteries

Study of the influence of the formation protocol on the SEI layer formed at the graphite electrode surface of a non-aqueous potassium-ion hybrid supercapacitor (KIC) through STEM and XPS analyses

Contact Info

Product

Resources

About

Delayed Rapid Anode Potential Decrease During Fixed Resistive Load Overdischarge of LiFePO4/Graphite Lithium-Ion Cells

Cited by 5 publications

References 60 publications

Analysis of Germanium Nanoparticle Composites with an Aluminum Current Collector toward Li-ion Battery Anodes with High Capacity and Broad Potential Stability Range

Analysis of Germanium Nanoparticle Composites with an Aluminum Current Collector toward Li-ion Battery Anodes with High Capacity and Broad Potential Stability Range

Effect of High-Rate Cycle Aging and Over-Discharge on NCM811 (LiNi0.8Co0.1Mn0.1O2) Batteries

Study of the influence of the formation protocol on the SEI layer formed at the graphite electrode surface of a non-aqueous potassium-ion hybrid supercapacitor (KIC) through STEM and XPS analyses

Contact Info

Product

Resources

About

Delayed Rapid Anode Potential Decrease During Fixed Resistive Load Overdischarge of LiFePO₄/Graphite Lithium-Ion Cells