Na-stabilized Ru-based lithium rich layered oxides with enhanced electrochemical performance for lithium ion batteries

Tian, Zixuan; Wang, Jiali; Liu, Shengzhou; Li, Qian; Zeng, Guifan; Yang, Yin; Cui, Yanhua

doi:10.1016/j.electacta.2017.09.032

Cited by 6 publications

(8 citation statements)

References 39 publications

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“…will reduce the side reaction between the surface of the positive electrode material and the electrolyte, and enhance the stability of the surface layered structure. elemental doping (Na + [34], Ce 3+ /Ce 4+ , and Sn 4+ [22], etc.) may significantly inhibit the Phase transition and stabilize the structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Composition on Voltage Attenuation of Li-Rich Cathode Material for Lithium-Ion Batteries

Liu

Zhu

et al. 2019

Materials

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Li-rich layered oxide cathode materials have become one of the most promising cathode materials for high specific energy lithium-ion batteries owning to its high theoretical specific capacity, low cost, high operating voltage and environmental friendliness. Yet they suffer from severe capacity and voltage attenuation during prolong cycling, which blocks their commercial application. To clarify these causes, we synthesize Li1.5Mn0.55Ni0.4Co0.05O2.5 (Li1.2Mn0.44Ni0.32Co0.04O2) with high-nickel-content cathode material by a solid-sate complexation method, and it manifests a lot slower capacity and voltage attenuation during prolong cycling compared to Li1.5Mn0.66Ni0.17Co0.17O2.5 (Li1.2Mn0.54Ni0.13Co0.13O2) and Li1.5Mn0.65Ni0.25Co0.1O2.5 (Li1.2Mn0.52Ni0.2Co0.08O2) cathode materials. The capacity retention at 1 C after 100 cycles reaches to 87.5% and the voltage attenuation after 100 cycles is only 0.460 V. Combining X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscopy (TEM), it indicates that increasing the nickel content not only stabilizes the structure but also alleviates the attenuation of capacity and voltage. Therefore, it provides a new idea for designing of Li-rich layered oxide cathode materials that suppress voltage and capacity attenuation.

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Section: Introductionmentioning

confidence: 99%

Effect of Different Composition on Voltage Attenuation of Li-Rich Cathode Material for Lithium-Ion Batteries

Liu

Zhu

et al. 2019

Materials

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“…Doping the oxide lattice has demonstrated to be a more facile way to modify the structural properties and to improve the cycling stability/voltage maintenance of LROs. To date, several attempts based on single cation doping have been reported . For example, the Mitra group demonstrated the capacity and cycling stability of LRO were enhanced by introducing an Ir dopant .…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we reported the adoption of a co‐doping strategy to simultaneously realize improved capacity, cycling stability, and voltage maintenance of LRO. Here, Cr and Na were selected as the dopants, since we previously demonstrated that both individually showed excellent performance improvement for the Ru‐based LRLO cathodes . To the best of our knowledge, there are few works on ion co‐substitution for Li and Ru sites in LRO.…”

Section: Introductionmentioning

confidence: 99%

“…To date, several attempts based on single cation doping have been reported. [30][31][32][33][34][35][36][37][38][39][40][41][42] For example, the Mitra group demonstrated the capacity and cycling stability of LRO were enhanced by introducing an Ir dopant. 32 The Im group discovered the Ti 4+ doping led to the improved cycle stability and rate performance of LROs.…”

Section: Introductionmentioning

confidence: 99%

“…Here, Cr and Na were selected as the dopants, since we previously demonstrated that both individually showed excellent performance improvement for the Ru-based LRLO cathodes. 36,37 To the best of our knowledge, there are few works on ion co-substitution for Li and Ru sites in LRO. Thus, this work is expected to be the beginning of fundamental research in designing multi-ionic-doped Ru-based LRLO cathode materials with high energy densities.…”

Section: Introductionmentioning

confidence: 99%

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A new lithium‐rich layer‐structured cathode material with improved electrochemical performance and voltage maintenance

et al. 2019

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Summary Lithium‐rich layered oxides (LRLOs) are highly attractive cathode materials for next‐generation lithium‐ion batteries because of their high reversible capacity, but poor cycle performance and voltage decay are two main problems that strongly limit their practical applications. These challenges also apply to the Ru‐based LRLOs of Li2RuO3. The Li2RuO3 cathode material is highly attractive because of their high conductivity and favourable electrochemical reaction kinetics. To overcome the problems associated with Li2RuO3, in contrast to normal single atom doping, here, we propose a Na, Cr co‐doping strategy with the design of Li2−xNaxRu0.95Cr0.05O3 (x = 0, 0.02, 0.06, and 0.1) series materials. Cr doping increases capacity, and Na doping suppresses voltage decay. As a result, the discharge capacity of the optimal Li1.98Na0.02Ru0.95Cr0.05O3 sample over 240 mAh/g after 50 charge‐discharge cycles at 0.2 C is maintained, and the capacity retention reaches a value of 80.5% compared with 69.1% for the undoped Li2RuO3. The value of the voltage decay in the Li1.98Na0.02Ru0.95Cr0.05O3 sample is 125 mV after 100 cycles at a rate of 1 C, and the voltage decay is 188.4 mV for the undoped Li2RuO3. This finding will expand the scope for designing novel layered electrodes with excellent performance.

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Electrochemical performance of Li-rich cathode material, 0.3Li2MnO3–0.7LiMn1/3Ni1/3Co1/3O2 microspheres with F-doping

et al. 2018

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Na-stabilized Ru-based lithium rich layered oxides with enhanced electrochemical performance for lithium ion batteries

Cited by 6 publications

References 39 publications

Effect of Different Composition on Voltage Attenuation of Li-Rich Cathode Material for Lithium-Ion Batteries

Effect of Different Composition on Voltage Attenuation of Li-Rich Cathode Material for Lithium-Ion Batteries

A new lithium‐rich layer‐structured cathode material with improved electrochemical performance and voltage maintenance

Electrochemical performance of Li-rich cathode material, 0.3Li2MnO3–0.7LiMn1/3Ni1/3Co1/3O2 microspheres with F-doping

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