7 research outputs found
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Electrolyte-Induced Surface Transformation and Transition-Metal Dissolution of Fully Delithiated LiNi0.8Co0.15Al0.05O2.
Enabling practical utilization of layered R3Ì…m positive electrodes near full delithiation requires an enhanced understanding of the complex electrode-electrolyte interactions that often induce failure. Using Li[Ni0.8Co0.15Al0.05]O2 (NCA) as a model layered compound, the chemical and structural stability in a strenuous thermal and electrochemical environment was explored. Operando microcalorimetry and electrochemical impedance spectroscopy identified a fingerprint for a structural decomposition and transition-metal dissolution reaction that occurs on the positive electrode at full delithiation. Surface-sensitive characterization techniques, including X-ray absorption spectroscopy and high-resolution transmission electron microscopy, measured a structural and morphological transformation of the surface and subsurface regions of NCA. Despite the bulk structural integrity being maintained, NCA surface degradation at a high state of charge induces excessive transition-metal dissolution and significant positive electrode impedance development, resulting in a rapid decrease in electrochemical performance. Additionally, the impact of electrolyte salt, positive electrode surface area, and surface Li2CO3 content on the magnitude and character of the dissolution reaction was studied
Recommended from our members
Electrolyte-Induced Surface Transformation and Transition-Metal Dissolution of Fully Delithiated LiNi0.8Co0.15Al0.05O2.
Enabling practical utilization of layered R3Ì…m positive electrodes near full delithiation requires an enhanced understanding of the complex electrode-electrolyte interactions that often induce failure. Using Li[Ni0.8Co0.15Al0.05]O2 (NCA) as a model layered compound, the chemical and structural stability in a strenuous thermal and electrochemical environment was explored. Operando microcalorimetry and electrochemical impedance spectroscopy identified a fingerprint for a structural decomposition and transition-metal dissolution reaction that occurs on the positive electrode at full delithiation. Surface-sensitive characterization techniques, including X-ray absorption spectroscopy and high-resolution transmission electron microscopy, measured a structural and morphological transformation of the surface and subsurface regions of NCA. Despite the bulk structural integrity being maintained, NCA surface degradation at a high state of charge induces excessive transition-metal dissolution and significant positive electrode impedance development, resulting in a rapid decrease in electrochemical performance. Additionally, the impact of electrolyte salt, positive electrode surface area, and surface Li2CO3 content on the magnitude and character of the dissolution reaction was studied
Electrolyte-Induced Surface Transformation and Transition-Metal Dissolution of Fully Delithiated LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>
Enabling practical utilization of
layered <i>R</i>3Ì…<i>m</i> positive electrodes
near full delithiation requires an
enhanced understanding of the complex electrode–electrolyte
interactions that often induce failure. Using LiÂ[Ni<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>]ÂO<sub>2</sub> (NCA) as a model layered
compound, the chemical and structural stability in a strenuous thermal
and electrochemical environment was explored. <i>Operando</i> microcalorimetry and electrochemical impedance spectroscopy identified
a fingerprint for a structural decomposition and transition-metal
dissolution reaction that occurs on the positive electrode at full
delithiation. Surface-sensitive characterization techniques, including
X-ray absorption spectroscopy and high-resolution transmission electron
microscopy, measured a structural and morphological transformation
of the surface and subsurface regions of NCA. Despite the bulk structural
integrity being maintained, NCA surface degradation at a high state
of charge induces excessive transition-metal dissolution and significant
positive electrode impedance development, resulting in a rapid decrease
in electrochemical performance. Additionally, the impact of electrolyte
salt, positive electrode surface area, and surface Li<sub>2</sub>CO<sub>3</sub> content on the magnitude and character of the dissolution
reaction was studied
Electrolyte-Induced Surface Transformation and Transition-Metal Dissolution of Fully Delithiated LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>
Enabling practical utilization of
layered <i>R</i>3Ì…<i>m</i> positive electrodes
near full delithiation requires an
enhanced understanding of the complex electrode–electrolyte
interactions that often induce failure. Using LiÂ[Ni<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>]ÂO<sub>2</sub> (NCA) as a model layered
compound, the chemical and structural stability in a strenuous thermal
and electrochemical environment was explored. <i>Operando</i> microcalorimetry and electrochemical impedance spectroscopy identified
a fingerprint for a structural decomposition and transition-metal
dissolution reaction that occurs on the positive electrode at full
delithiation. Surface-sensitive characterization techniques, including
X-ray absorption spectroscopy and high-resolution transmission electron
microscopy, measured a structural and morphological transformation
of the surface and subsurface regions of NCA. Despite the bulk structural
integrity being maintained, NCA surface degradation at a high state
of charge induces excessive transition-metal dissolution and significant
positive electrode impedance development, resulting in a rapid decrease
in electrochemical performance. Additionally, the impact of electrolyte
salt, positive electrode surface area, and surface Li<sub>2</sub>CO<sub>3</sub> content on the magnitude and character of the dissolution
reaction was studied