The positive role of (NH4)3AlF6 coating on Li[Li0.2Ni0.2Mn0.6]O2 oxide as the cathode material for lithium-ion batteries

Wu, Feng; Xue, Qilong; Li, Li; Zhang, Xiaoxiao; Huang, Yong-Chang; Fan, Ersha; Chen, Renjie

doi:10.1039/c6ra24947g

Cited by 18 publications

(7 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar strategies have been applied to suppress the harmful interaction between electrode materials and electrolytes for lithium ion batteries. [11][12][13] The alumina coating for lithium cobalt uorophosphate was reported to prevent metal ion dissolution and improve the cycle performance. 14 A widely recognized interpret is that the alumina coating can protect cathode materials from hazardous reaction products such as HF obtained during the charge-discharge process.…”

Section: Introductionmentioning

confidence: 99%

Suppressing self-discharge of Li–B/CoS₂ thermal batteries by using a carbon-coated CoS₂ cathode

et al. 2018

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Suppressing self-discharge of Li–B/CoS₂ thermal batteries by using a carbon-coated CoS₂ cathode

et al. 2018

View full text Add to dashboard Cite

show abstract

“…This suggests that NH 4 + existed in the reaction process from the beginning to the end . It has been reported that (NH 4 ) 3 AlF 6 could enhance the reversible capacity and cycling performance of SCs when it is coated on cathode material …”

Section: Resultsmentioning

confidence: 88%

K⁺ Intercalation of NH₄HF₂‐Exfoliated Ti₃C₂ MXene as Binder‐Free Electrodes with High Electrochemical Capacitance

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

As a 2D material, Ti3C2 (MXene) has been recently used as electrodes for electrochemical capacitors. Herein, a two‐step procedure is used to obtain a highly opened layer structure for Ti3C2, which differs from the methods used in the literature for synthesizing exfoliated MXene. First, the mild NH4HF2 etching agent is used to prepare the regular Ti3C2 MXene. Second, KOH is added into the obtained solution for K+ to intercalate the MXene. The K+ intercalation is found to greatly increase the (002) crystal planar spacing of the Ti3C2 from 10.8 to 12.4 Å. More importantly, this K+‐intercalated MXene exhibits a highly opened layer structure, whereas the regular MXene only has a partially opened layer structure. Consequently, the former is expected to allow much more active sites exposed to liquid electrolyte, and also facilitates remarkably higher ion and electron transport efficiency. To investigate their electrochemical capacitance properties, the regular and K+‐intercalated Ti3C2 MXenes are used to fabricate binder‐free electrodes on nickel foams by an electrophoretic deposition method. The K+‐intercalated MXene‐based electrode is found to have twice higher specific capacitance than the regular MXene. Furthermore, the K+‐intercalated Ti3C2 MXene‐based electrode exhibits an excellent cyclic stability.

show abstract

“…Composition [29][30][31][32][33][34][35][36] Compared to LLO (4.79114 Å), a considerable d-spacing shift in the c-axis direction can be detected in the LLO-500 sample (4.78117 Å), which can be ascribed to the pre-introduced oxygen vacancies and shrinkage of the layer structure in LLO-500 (Supporting Information, Figure S1a ). Comparison of the d-spacing changes of the various post-annealed samples, including LLO, LLO-200, LLO-300, LLO-400, LLO-500, LLO-600, shows that the LLO-500 sample displays the largest d-spacing change due to OVs formation (see Supporting Information, Figure S1b).…”

Section: Resultsmentioning

confidence: 99%

Boosting the Electrochemical Performance of Lithium‐Rich Cathodes by Oxygen Vacancy Engineering

Farahmandjou

Lai

Safaei

et al. 2023

Batteries & Supercaps

View full text Add to dashboard Cite

The challenges of voltage decay and irreversible oxygen release for lithium‐rich layered oxide cathode materials have hindered their commercial application despite their high energy density and low cost. Herein, a facile post‐annealing strategy is developed to pre‐introduce oxygen vacancies (OVs) into Li1.2Mn0.457Ni0.229Co0.114O2 cathode materials. The induced OVs modify the local Mn coordination environments, enhance structural stability, and suppress oxygen release. The modified cathode exhibits a discharge capacity of 224.1 mAh g−1 at 0.1 C after 100 cycles with 97.7 % capacity retention. Even at 2 C, excellent capacity retention of 93.3 % after 300 cycles can be achieved. In situ and ex situ X‐ray diffraction are used to elucidate the reaction mechanisms and crystal structure during cycling tests. Ex situ X‐ray photoelectron spectroscopy confirmed the suppressed oxygen release, enhanced oxygen vacancies and reduced cathode‐electrolyte interfacial layer after cycling for the post‐annealed cathode. Our results show that the presence of oxygen vacancies through thermal expansion diminishes the phase transitions in cathode materials during the heating process. These findings contribute to developing next‐generation Li‐ion batteries (LIBs) by oxygen vacancy engineering for new cathode materials with improved electrochemical performances.

show abstract

The positive role of (NH₄)₃AlF₆ coating on Li[Li_0.2Ni_0.2Mn_0.6]O₂ oxide as the cathode material for lithium-ion batteries

Abstract: A Li-rich cathode material Li1.2Ni0.2Mn0.6O2 coated with (NH4)3AlF6 and its enhanced electrochemical cycling performance.

Cited by 18 publications

References 55 publications

Suppressing self-discharge of Li–B/CoS₂ thermal batteries by using a carbon-coated CoS₂ cathode

Suppressing self-discharge of Li–B/CoS₂ thermal batteries by using a carbon-coated CoS₂ cathode

K⁺ Intercalation of NH₄HF₂‐Exfoliated Ti₃C₂ MXene as Binder‐Free Electrodes with High Electrochemical Capacitance

Boosting the Electrochemical Performance of Lithium‐Rich Cathodes by Oxygen Vacancy Engineering

Contact Info

Product

Resources

About

The positive role of (NH4)3AlF6 coating on Li[Li0.2Ni0.2Mn0.6]O2 oxide as the cathode material for lithium-ion batteries

Abstract: A Li-rich cathode material Li1.2Ni0.2Mn0.6O2 coated with (NH4)3AlF6 and its enhanced electrochemical cycling performance.

Cited by 18 publications

References 55 publications

Suppressing self-discharge of Li–B/CoS2 thermal batteries by using a carbon-coated CoS2 cathode

Suppressing self-discharge of Li–B/CoS2 thermal batteries by using a carbon-coated CoS2 cathode

K+ Intercalation of NH4HF2‐Exfoliated Ti3C2 MXene as Binder‐Free Electrodes with High Electrochemical Capacitance

Boosting the Electrochemical Performance of Lithium‐Rich Cathodes by Oxygen Vacancy Engineering

Contact Info

Product

Resources

About

The positive role of (NH₄)₃AlF₆ coating on Li[Li_0.2Ni_0.2Mn_0.6]O₂ oxide as the cathode material for lithium-ion batteries

Suppressing self-discharge of Li–B/CoS₂ thermal batteries by using a carbon-coated CoS₂ cathode

Suppressing self-discharge of Li–B/CoS₂ thermal batteries by using a carbon-coated CoS₂ cathode

K⁺ Intercalation of NH₄HF₂‐Exfoliated Ti₃C₂ MXene as Binder‐Free Electrodes with High Electrochemical Capacitance