Suppression of Voltage Decay and Improvement in Electrochemical Performance by Zirconium Doping in Li-Rich Cathode Materials for Li-Ion Batteries

Dahiya, P. P.; Ghanty, Chandan; Sahoo, K.; Basu, Suddhasatwa; Majumder, S. B.

doi:10.1149/2.0751813jes

Cited by 33 publications

(20 citation statements)

References 51 publications

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“…It is further proved that the coating of LiCeO 2 plays a significant role in stabilizing the structure of the bulk material. To further understand the excellent electrochemical performance of 3% LiCeO 2 and to research the kinetics of Li + insertion/extraction during the cycle, electrochemical impedance spectroscopy (EIS) was performed, and the Li + diffusion coefficient was calculated through the galvanostatic intermittent titration technique (GITT), 45,46 as shown in Figure 7. Figure 7a and b present Nyquist plots of the electrodes before and after 200 cycles at 1 C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Surface-Functionalized Coating for Lithium-Rich Cathode Material To Achieve Ultra-High Rate and Excellent Cycle Performance

et al. 2019

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Although the lithium-rich cathode material Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 , as a promising cathode material, has a high specific capacity, it suffers from capacity decay and discharge voltage decay during cycling. In this work, the specific capacity and discharge voltage of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 are stabilized by surface-functionalized LiCeO 2 coating. We have conducted LiCeO 2 coating via a mild synchronous lithium strategy to protect the electrode surface from electrolyte attack. This optimized LiCeO 2 coating has high Li + conductivity and abundant oxygen vacancies. The results demonstrate that 3% LiCeO 2 -coated Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 exhibits the highest capacity retention rate at 1, 2, and 5 C after 200 cycles, which were 84.3%, 85.4%, and 86.3%, respectively. The discharge specific capacity was almost 1.3, 1.4, and 1.4 times that of the pristine electrode. In addition, the 3% LiCeO 2 electrode exhibited the least voltage decay of 0.409, 0.497, and 0.494 V at 1, 2, and 5 C, which was only about half of the pristine electrode. It should not be overlooked that the 3% LiCeO 2 electrode still exhibits a high capacity at high current densities of 1250 mA g −1 (5 C) and 2500 mA g −1 (10 C), and its specific discharge capacities are 190.5 and 160.6 mAh g −1 , respectively. These outstanding electrochemical properties benefit from surface-functionalized LiCeO 2 coatings. To better understand the mechanism of oxygen loss of lithium-rich materials, we propose the lattice oxygen migration path of the LiCeO 2 -coated electrodes during the cycle. Our research provides a possible solution to the poor rate capability and cycle performance of cathode materials through surfacefunctionalized coatings.

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Section: Resultsmentioning

confidence: 99%

Surface-Functionalized Coating for Lithium-Rich Cathode Material To Achieve Ultra-High Rate and Excellent Cycle Performance

et al. 2019

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“…The diffusion coefficients of Li + ( D Li + ) are further assessed by GITT test, as shown in Figure C,D. The Li + diffusion coefficient can be determined based on the following formula, used with GITT analysis

D_{italicLi +} = \frac{4}{πτ} {(\frac{m_{B} V_{m}}{M_{B} S})}^{2} {(\frac{normalΔ E_{s}}{normalΔ E_{t}})}^{2 .}

…”

Section: Resultsmentioning

confidence: 99%

Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials

et al. 2020

Int J Energy Res

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Summary The layered lithium‐rich manganese‐based cathode material (Li1.2Mn0.54Co0.13Ni0.13) has the significant advantage of high specific capacity, but this material also suffers serious defects, including severe capacity attenuation and voltage attenuation during the cycle. At present, most researchers have been working to optimize the cycle performance of lithium‐rich materials. In this work, we propose a surface homogenizing heterostructure coating induced by MXene modification to reduce capacity reduction and voltage decay. It can be found that the initial Coulombic efficiency (ICE) increases from 77.2% for the bare electrode Li1.2Mn0.54Co0.13Ni0.13 (LMO) to 85.5% for 1.4 wt% MXene (Ti3C2Tx, Tx represents the surface terminations: OH, O, F) modified lithium‐rich (TO2). Furthermore, the discharge specific capacity of the electrode at 5 C rate increased from 160.7 mAh g−1 for LMO to 200.6 mAh g−1 for TO2. More prominently, the outstanding cycle stability with capacity retention rate is 82.1% for TO2 after 200 cycles, while only 64.7% for LMO, and the average discharge voltage dropped from 0.788 to 0.468 V. In addition, the mechanism for improving the electrochemical performance is systematically studied.

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“…However, Zr doping has no obvious positive impact on activation, giving a similar activation capacity to undoped pristine materials. In fact, Zr can diminish the redox of other transition metals, resulting in a much lower capacity for both charging and discharging [134].…”

Section: Elemental Substitutionmentioning

confidence: 99%

Understanding and Control of Activation Process of Lithium-Rich Cathode Materials

Lin

Seaby

et al. 2022

Electrochem. Energy Rev.

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Lithium-rich materials (LRMs) are among the most promising cathode materials toward next-generation Li-ion batteries due to their extraordinary specific capacity of over 250 mAh g−1 and high energy density of over 1 000 Wh kg−1. The superior capacity of LRMs originates from the activation process of the key active component Li2MnO3. This process can trigger reversible oxygen redox, providing extra charge for more Li-ion extraction. However, such an activation process is kinetically slow with complex phase transformations. To address these issues, tremendous effort has been made to explore the mechanism and origin of activation, yet there are still many controversies. Despite considerable strategies that have been proposed to improve the performance of LRMs, in-depth understanding of the relationship between the LRMs’ preparation and their activation process is limited. To inspire further research on LRMs, this article firstly systematically reviews the progress in mechanism studies and performance improving attempts. Then, guidelines for activation controlling strategies, including composition adjustment, elemental substitution and chemical treatment, are provided for the future design of Li-rich cathode materials. Based on these investigations, recommendations on Li-rich materials with precisely controlled Mn/Ni/Co composition, multi-elemental substitution and oxygen vacancy engineering are proposed for designing high-performance Li-rich cathode materials with fast and stable activation processes. Graphical abstract The “Troika” of composition adjustment, elemental substitution, and chemical treatment can drive the Li-rich cathode towards stabilized and accelerated activation.

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Suppression of Voltage Decay and Improvement in Electrochemical Performance by Zirconium Doping in Li-Rich Cathode Materials for Li-Ion Batteries

Cited by 33 publications

References 51 publications

Surface-Functionalized Coating for Lithium-Rich Cathode Material To Achieve Ultra-High Rate and Excellent Cycle Performance

Surface-Functionalized Coating for Lithium-Rich Cathode Material To Achieve Ultra-High Rate and Excellent Cycle Performance

Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials

Understanding and Control of Activation Process of Lithium-Rich Cathode Materials

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Suppression of Voltage Decay and Improvement in Electrochemical Performance by Zirconium Doping in Li-Rich Cathode Materials for Li-Ion Batteries

Cited by 33 publications

References 51 publications

Surface-Functionalized Coating for Lithium-Rich Cathode Material To Achieve Ultra-High Rate and Excellent Cycle Performance

Surface-Functionalized Coating for Lithium-Rich Cathode Material To Achieve Ultra-High Rate and Excellent Cycle Performance

Surface homogenizing heterostructure coatings induced by Ti 3 C 2 T x MXene for enhanced cycle performance of lithium‐rich cathode materials

Understanding and Control of Activation Process of Lithium-Rich Cathode Materials

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Surface homogenizing heterostructure coatings induced by Ti ₃ C ₂ T _x MXene for enhanced cycle performance of lithium‐rich cathode materials