Aaron Liu
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View article: How to Measure Solid State Lithium-ion Diffusion using the Atlung Method for Intercalant Diffusion
How to Measure Solid State Lithium-ion Diffusion using the Atlung Method for Intercalant Diffusion Open
A systematic investigation of the factors that affect lithium diffusion coefficient measurements in the Atlung Method for Intercalant Diffusion (AMID) is carried out. Single crystal LiNi 0.6 Mn 0.2 Co 0.2 O 2 is used for method development…
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: Tracking the Fate of Excess Li in the Synthesis of Various Liy[Ni<sub>1−x</sub>Mn<sub>x</sub>]O<sub>2</sub> Positive Electrode Materials Under Different Atmospheres
Tracking the Fate of Excess Li in the Synthesis of Various Liy[Ni<sub>1−x</sub>Mn<sub>x</sub>]O<sub>2</sub> Positive Electrode Materials Under Different Atmospheres Open
Various Ni-rich Li y [Ni 1−x Mn x ]O 2 (x = ∼0.08, 0.2, 0.5) materials were synthesized with excess Li precursor in oxygen, dry air or air to understand what happens to the excess Li during synthesis. The Li[Ni 1−x Mn x ]O 2 components of …
View article: A Baseline Kinetic Study of Co-Free Layered Li<sub>1+x</sub>(Ni<sub>0.5</sub>Mn<sub>0.5</sub>)<sub>1−x</sub>O<sub>2</sub> Positive Electrode Materials for Lithium-Ion Batteries
A Baseline Kinetic Study of Co-Free Layered Li<sub>1+x</sub>(Ni<sub>0.5</sub>Mn<sub>0.5</sub>)<sub>1−x</sub>O<sub>2</sub> Positive Electrode Materials for Lithium-Ion Batteries Open
Variations of Li chemical diffusion coefficient () 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".…
View article: Correlating Cation Mixing with Li Kinetics: Electrochemical and Li Diffusion Measurements on Li-Deficient LiNiO<sub>2</sub> and Li-Excess LiNi<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub>
Correlating Cation Mixing with Li Kinetics: Electrochemical and Li Diffusion Measurements on Li-Deficient LiNiO<sub>2</sub> and Li-Excess LiNi<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub> Open
Cation mixing in Li-based layered positive electrode materials has been reported to negatively affect the electrochemical performance and transport properties of intercalated Li. However, no previous reports have systematically correlated …
View article: Factors that Affect Capacity in the Low Voltage Kinetic Hindrance Region of Ni-Rich Positive Electrode Materials and Diffusion Measurements from a Reinvented Approach
Factors that Affect Capacity in the Low Voltage Kinetic Hindrance Region of Ni-Rich Positive Electrode Materials and Diffusion Measurements from a Reinvented Approach Open
With research continuing to push for higher Ni content in positive electrode materials, issues such as the 1st cycle irreversible capacity and kinetic hindrances related to Li diffusion become more significant. This work highlights the imp…
View article: Synthesis of Co-Free Ni-Rich Single Crystal Positive Electrode Materials for Lithium Ion Batteries: Part II. One-Step Lithiation Method of Mg-Doped LiNiO<sub>2</sub>
Synthesis of Co-Free Ni-Rich Single Crystal Positive Electrode Materials for Lithium Ion Batteries: Part II. One-Step Lithiation Method of Mg-Doped LiNiO<sub>2</sub> Open
This second study in a two part series investigates the synthesis of Co-free single crystalline Mg-doped LNO via the one-step lithiation method. The synthesized materials were characterized by scanning electron microscopy, X-ray diffractio…
View article: Synthesis of Co-Free Ni-Rich Single Crystal Positive Electrode Materials for Lithium Ion Batteries: Part I. Two-Step Lithiation Method for Al- or Mg-Doped LiNiO<sub>2</sub>
Synthesis of Co-Free Ni-Rich Single Crystal Positive Electrode Materials for Lithium Ion Batteries: Part I. Two-Step Lithiation Method for Al- or Mg-Doped LiNiO<sub>2</sub> Open
Increasing the Ni content of a Ni-rich layered positive electrode material is one common way to improve energy density of Li-ion cells but normally leads to shorter cell lifetimes. Single crystalline materials have been shown to improve th…
View article: Study of the Reactions between Ni-Rich Positive Electrode Materials and Aqueous Solutions and their Relation to the Failure of Li-Ion Cells
Study of the Reactions between Ni-Rich Positive Electrode Materials and Aqueous Solutions and their Relation to the Failure of Li-Ion Cells Open
The handling of positive electrode active materials must be done carefully due to their propensity to degrade when exposed to ambient atmosphere. The growth of impurities on Ni-rich layered lithium transition metal oxides (LTMOs) is partic…
View article: Impact of Al Doping and Surface Coating on the Electrochemical Performances of Li-Rich Mn-Rich Li<sub>1.11</sub>Ni<sub>0.33</sub>Mn<sub>0.56</sub>O<sub>2</sub> Positive Electrode Material
Impact of Al Doping and Surface Coating on the Electrochemical Performances of Li-Rich Mn-Rich Li<sub>1.11</sub>Ni<sub>0.33</sub>Mn<sub>0.56</sub>O<sub>2</sub> Positive Electrode Material Open
Li and Mn-rich positive electrode materials, Li[Li x TM 1−x ]O 2 (TM = Ni, Co, and Mn), with a single-phase layered structure have been considered for use in next-generation Li-ion batteries for electric vehicles and many advanced applicat…
View article: Effects of Fluorine Doping on Nickel-Rich Positive Electrode Materials for Lithium-Ion Batteries
Effects of Fluorine Doping on Nickel-Rich Positive Electrode Materials for Lithium-Ion Batteries Open
Three fluorine-doped lithium nickel oxide samples series (LiNiO 2−x F x , LiNi 1−x Mg x O 2−x F x ; Li 1+x/2 Ni 1−x/2 O 2−x F x ) were prepared and investigated. It is suggested that fluorine was introduced into the lattice structure durin…
View article: The Formation of Layered Double Hydroxide Phases in the Coprecipitation Syntheses of [Ni0.80Co0.15](1−x)/0.95Alx(OH)2(anionn−)x/n (x = 0–0.2, n = 1, 2)
The Formation of Layered Double Hydroxide Phases in the Coprecipitation Syntheses of [Ni0.80Co0.15](1−x)/0.95Alx(OH)2(anionn−)x/n (x = 0–0.2, n = 1, 2) Open
This study investigates the synthesis of [Ni0.80Co0.15](1−x)/0.95Alx(OH)2 (x = 0–0.2) materials by coprecipitation to understand the formation of layered double hydroxide (LDH) phases as influenced by Al content and synthesis route. Two ro…
View article: Impact of Dopants (Al, Mg, Mn, Co) on the Reactivity of Li<sub>x</sub>NiO<sub>2</sub> with the Electrolyte of Li-Ion Batteries
Impact of Dopants (Al, Mg, Mn, Co) on the Reactivity of Li<sub>x</sub>NiO<sub>2</sub> with the Electrolyte of Li-Ion Batteries Open
First-principles computation of bulk O binding energies and Bader charges revealed the importance of Li content on thermal decomposition of charged high-nickel positive electrode materials for Li-ion batteries (LixNi1-yMyO2, 0 < x < 1, y =…
View article: Investigating the Effects of Magnesium Doping in Various Ni-Rich Positive Electrode Materials for Lithium Ion Batteries
Investigating the Effects of Magnesium Doping in Various Ni-Rich Positive Electrode Materials for Lithium Ion Batteries Open
This work studies the effect of Mg doping in LiMO2 (M = Ni, Ni+Al, Ni+Co+Al, Ni content >0.8) at a dopant level of less than 5%. Synthesized materials were all single phase and contained no appreciable amount of surface or bulk impurities.…
View article: Impact of the Synthesis Conditions on the Performance of LiNi<sub>x</sub>Co<sub>y</sub>Al<sub>z</sub>O<sub>2</sub> with High Ni and Low Co Content
Impact of the Synthesis Conditions on the Performance of LiNi<sub>x</sub>Co<sub>y</sub>Al<sub>z</sub>O<sub>2</sub> with High Ni and Low Co Content Open
One way to lower the cost of lithium ion batteries using LiNixMnyCozO2 (NMC) or LiNi0.80Co0.15Al0.05O2 is to lower the Co content in the positive electrode materials. This work systematically studied the impact of the synthesis conditions …
View article: Synthesis of Mg and Mn Doped LiCoO<sub>2</sub>and Effects on High Voltage Cycling
Synthesis of Mg and Mn Doped LiCoO<sub>2</sub>and Effects on High Voltage Cycling Open
LiCo1-2xMgxMnxO2 (0 ≤ x ≤ 0.05) materials were prepared from Co1-2xMgxMnx(OH)2 (0 ≤ x ≤ 0.05) co-precipitated precursor materials by mixing precursor materials with stoichiometric amounts of Li2CO3 and heating to 900°C for 10 h. All precur…