Facile and scalable fabrication of K+-doped Li1.2Ni0.2Co0.08Mn0.52O2 cathode with ultra high capacity and enhanced cycling stability for lithium ion batteries

Liu, Zongze; Zhang, Zhen; Liu, Yameng; Li, Liansheng; Fu, Sihan

doi:10.1016/j.ssi.2018.12.021

Cited by 30 publications

(12 citation statements)

References 47 publications

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“…On the other hand, during discharging to 2.5 V, the structure begins with contraction of the layer structure (Li slab), so higher charger-transfer resistance may lead to lower current intensity. These findings are consistent with other studies. − …”

Section: Resultssupporting

confidence: 94%

Systematic Study of Different Anion Doping on the Electrochemical Performance of Cobalt-Free Lithium–Manganese-Rich Layered Cathode

Vanaphuti

Bong

et al. 2020

ACS Appl. Energy Mater.

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Regardless of the appealingly high energy density (1000 Wh kg–1) of the lithium–manganese-rich layered oxide cathode (LMR-NMO), this material still suffers from rapid capacity and voltage decay after continuous cycling. LMR-NMO involves the redox reaction of both transition metals and oxygen to gain additional capacity in comparison with a conventional NMC cathode. Due to the use of a high voltage range (beyond 4.4 V), the oxygen release from the structure initiates and in turn generates intergranular cracks and spinel formation, consequently, into rock-salt structure. Here, LMR-NMO with different doping ranges (1–5 mol %) of F, S, and Cl are being examined to summarize the benefits and drawbacks of each anion. This study shows that F is the best candidate as it increases average voltage (voltage retention 96–97% after 200 cycles at 0.5 C), improves ionic conductivity (nearly two times higher than pristine), reduces cation mixing, minimizes oxygen release, and offers high stability during high temperature cycle. However, for S and Cl, the results are conflicted. An optimal amount of anion dopants should be considered as the side effects might overcome the benefits when the doping amount is excessive.

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Section: Resultssupporting

confidence: 94%

Systematic Study of Different Anion Doping on the Electrochemical Performance of Cobalt-Free Lithium–Manganese-Rich Layered Cathode

Vanaphuti

Bong

et al. 2020

ACS Appl. Energy Mater.

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“…The XPS spectra of Ni, Mn, Na, and K are also shown in Figure d–h. The Mn 2p band at 642.2 eV with a + 4 valence state was almost not influenced by the doping of Na and K whereas the presence of the peaks at 1072 and above 290 eV evidences the successful doping of Na and K, respectively, − as shown in Figures S6 and S7. The Ni 2p 3/2 peaks could be deconvoluted into two components of Ni 2+ and Ni 3+ and the O 1s peaks into three components of surface oxygen vacancies (SOVs), lattice oxygen (LO), and surface adsorbed oxide species (SO) from which their corresponding percentages could be estimated, , as shown in Figure f.…”

Section: Resultsmentioning

confidence: 89%

Lithium Antievaporation-Loss Engineering via Sodium/Potassium Doping Enables Superior Electrochemical Performance of High-Nickel Li-Rich Layered Oxide Cathodes

Mao

Tan

Guo

et al. 2022

ACS Appl. Mater. Interfaces

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Low-cost Mn- and Li-rich layered oxides suffer from rapid voltage decay, which can be improved by increasing the nickel content to derive high nickel Li-rich layered oxides (HNLO) but is normally accompanied by reduced capacity and inferior cycling stability. Herein, Na or K ions are successfully doped into the lattice of high nickel Li-rich Li1.2–x M x Ni0.32Mn0.48O2 (M = Na, K) layered oxides via a facile expanded graphite template-sacrificed approach. Both Na- and K-doped samples exhibit excellent rate capability and cycling stability compared with the un-doped one. The Na-doped sample shows a capacity retention of 93% after 200 cycles at 1C, which is quite outstanding for HNLO. The greatly improved electrochemical performances are attributed to the increased effective Li content in the lattice via Li antievaporation-loss engineering, the expanded Li slab, the pillaring effect, the increased C2/m component, and the improved electronic conductivity. Different performances by the introduction of sodium and potassium ions may be ascribed to their different ionic radii, which give rise to their different doping behaviors and threshold doping amounts. This work provides a new idea of enhancing electrochemical performance of HNLO by doping proper alien elements to increase the lattice lithium content effectively.

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“…The peak positions of Co2p and Mn2p have not shifted, indicating that this modification method will not affect the valence state of other elements. 33 And there is an obvious peak at the binding energy of 133.5 eV (Fig. 4f).…”

Section: Resultsmentioning

confidence: 97%

Surface-Modification of Doping and Coating Li_1.2Ni_0.2Co_0.08Mn_0.52O₂ as a Long Life Cathode Material of Lithium-Ion Battery by Sodium Salt Treatment

Wu¹,

Zhang²,

Wang³

et al. 2023

J. Electrochem. Soc.

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Lithium-rich layered oxides are considered to be the most promising next-generation lithium-ion cathode materials due to their high specific capacity and energy density. However, its commercialization is limited due to its poor cycling stability and severe voltage decay. A NaH2PO4 molten salt treatment is designed, which simultaneously realizes Na+ doping and phosphate coating to improve the defects of lithium-rich materials. Sodium dihydrogen phosphate is of good contact with lithium-rich materials in the process of high-temperature melting to facilitate surface sodium doping which is conducive to stabilizing the surface structure through lithium-sodium exchange. At the same time, the phosphate coating produced by lithium-sodium exchange and dehydration on the outer surface of the material can effectively inhibit the corrosion of the electrolyte. The modified material obtained by the synergistic effect of doping and coating has a capacity of 262.4 mAh·g-1 at 0.1 C and 169.6 mAh g-1 at 5 C, the capacity retention rate of 73.6% after 500 cycles, and the voltage decay is significantly improved. A simple and effective method for improving the electrochemical performance of Li-rich layered materials is provided.

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Facile and scalable fabrication of K+-doped Li1.2Ni0.2Co0.08Mn0.52O2 cathode with ultra high capacity and enhanced cycling stability for lithium ion batteries

Cited by 30 publications

References 47 publications

Systematic Study of Different Anion Doping on the Electrochemical Performance of Cobalt-Free Lithium–Manganese-Rich Layered Cathode

Systematic Study of Different Anion Doping on the Electrochemical Performance of Cobalt-Free Lithium–Manganese-Rich Layered Cathode

Lithium Antievaporation-Loss Engineering via Sodium/Potassium Doping Enables Superior Electrochemical Performance of High-Nickel Li-Rich Layered Oxide Cathodes

Surface-Modification of Doping and Coating Li_1.2Ni_0.2Co_0.08Mn_0.52O₂ as a Long Life Cathode Material of Lithium-Ion Battery by Sodium Salt Treatment

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Facile and scalable fabrication of K+-doped Li1.2Ni0.2Co0.08Mn0.52O2 cathode with ultra high capacity and enhanced cycling stability for lithium ion batteries

Cited by 30 publications

References 47 publications

Systematic Study of Different Anion Doping on the Electrochemical Performance of Cobalt-Free Lithium–Manganese-Rich Layered Cathode

Systematic Study of Different Anion Doping on the Electrochemical Performance of Cobalt-Free Lithium–Manganese-Rich Layered Cathode

Lithium Antievaporation-Loss Engineering via Sodium/Potassium Doping Enables Superior Electrochemical Performance of High-Nickel Li-Rich Layered Oxide Cathodes

Surface-Modification of Doping and Coating Li1.2Ni0.2Co0.08Mn0.52O2 as a Long Life Cathode Material of Lithium-Ion Battery by Sodium Salt Treatment

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Surface-Modification of Doping and Coating Li_1.2Ni_0.2Co_0.08Mn_0.52O₂ as a Long Life Cathode Material of Lithium-Ion Battery by Sodium Salt Treatment