Li-ion diffusivity and electrochemical performance of Ni-rich cathode material doped with fluoride ions

Kim, Sung-Beom; Kim, Hyeona; Park, Deok‐Hye; Kim, Ji‐Hwan; Shin, Jae‐Hoon; Jang, Jae‐Sung; Moon, Sangook; Choi, J.; Park, Kyung-Won

doi:10.1016/j.jpowsour.2021.230219

Cited by 70 publications

(35 citation statements)

References 65 publications

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“…[56] On the other hand, excessive doping of stable Fe may produce an excessive number of oxygen vacancies and might not easily deinsert Li + ions into LFMO-0.4, increasing R inter . Furthermore, the diffusion coefficient of Li + ions (D Li + ) in the cathode was calculated using Equation ( 3): [64][65][66]…”

Section: Resultsmentioning

confidence: 99%

Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries

et al. 2022

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LiMn 2 O 4 (LMO) with a spinel crystal structure is a promising cathode for next-generation Li-ion batteries (LIBs), owing to its low cost and high operating voltage of ~4.4 V. However, due to the Jahn-Teller distortion effect, LMO typically exhibits deteriorated cycling performance, owing to the dissolution of Mn into a liquid electrolyte. In this study, Fe-doped truncated octahedral LMO cathodes with different concentrations were synthesized to improve LMO stability in LIBs. The Fe-doped truncated octahedral LMO was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The Li + ion diffusion coefficients of the cathodes were measured using electrochemical impedance spectroscopy and the galvanostatic intermittent titration technique. Compared to the truncated octahedral undoped LMO, the Fe-doped LMO cathode with an appropriate amount of dopant exhibited the best LIB performance, with the highest Li + ion diffusivity resulting from the increased oxygen vacancy as the path of Li + ion.

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Section: Resultsmentioning

confidence: 99%

Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries

et al. 2022

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“…Halogen elements could substitute oxygen partially in high‐Ni NCM cathode because of their similar chemical properties to oxygen ions, among which, the fluorine‐doped NCM is one of the most typical structures. [ 88 ] Compared to the undoped LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM‐bare) sample, the 6 mol% F‐doped LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCMF‐6) cathode materials exhibit improved cycling stability by the aid of the stronger bond of TM and F. Figure 9A shows the occupation of oxygen sites by F in F‐doped NCM cathode, which expands the d‐spacing of the structure due to the partial exchange by metallic species with larger ionic radius to compensate electrical neutrality during F‐doping. This provides wider paths for Li + transport, resulting in an increased Li + diffusion coefficient (Figure 9B).…”

Section: Ionic Dopingmentioning

confidence: 99%

“…Reproduced with permission. [ 88 ] Copyright 2021, Elsevier Ltd. (E) Cycling performance of pristine NCA and B0.015‐NCA electrodes at 2C between 2.8 and 4.3 V at 55°C. (F) Schematic diagram of pristine and B0.015‐NCA particles after a long cycle.…”

Section: Ionic Dopingmentioning

confidence: 99%

Recent progress on the modification of high nickel content NCM: Coating, doping, and single crystallization

Yan

Huang

Tong

et al. 2022

Interdisciplinary Materials

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High nickel content layered cathodes, represented by NCM (LiNi x Co y Mn z O 2 ,x + y + z = 1), are now widely employed in the market of electric vehicles, owing to their high energy density. With the gradual increase of nickel content and capacity, the issues on cycling life and safety become more serious. In this review, various strategies for improving the performance of high nickel NCM are summarized on the aspects of surface coating, ionic doping, and singlecrystal NCM. The coating strategy was separately described according to the physical property of coating species, including inert material coating, Li +conductor coating, electronic conductor coating, and mixed conductor coating. These coating species help to suppress the interfacial oxidation of electrolytes by NCM, improving the cycling life and safety. The elemental doping in the crystal lattice of NCM is then presented in the aspects of cation, anion, and mixed-ion doping, which are beneficial to stabilize the layered structure during charge-discharge and so promote the electrochemical performance. In quite recent years, the strategy of single-crystal NCM was demonstrated to be a promising pathway, owing to the dramatically reduced surface area and grain boundary. Finally, the remaining unsolved challenges and future strategies for further development of NCM cathode materials are outlined.

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“…It is beneficial to improve the structural stability of the cathode material and the cycle life of the battery. Kim et al [ 75 ] prepared F-doped Ni-rich NCMs (LiNi 0.8 Co 0.1 Mn 0.1 O 2−x F x ) with different amounts of F as a dopant. In comparison to the undoped NCM sample, the F-doped cathode materials show better cycling performance and rate capability because of the structural stability.…”

Section: Modificationsmentioning

confidence: 99%

Challenges and Modification Strategies of Ni-Rich Cathode Materials Operating at High-Voltage

Liao

Liu

2022

Nanomaterials

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Ni-rich cathode materials have become promising candidates for lithium-based automotive batteries due to the obvious advantage of electrochemical performance. Increasing the operating voltage is an effective means to obtain a higher specific capacity, which also helps to achieve the goal of high energy density (capacity × voltage) of power lithium-ion batteries (LIBs). However, under high operating voltage, surface degradation will occur between Ni-rich cathode materials and the electrolytes, forming a solid interface film with high resistance, releasing O2, CO2 and other gases. Ni-rich cathode materials have serious cation mixing, resulting in an adverse phase transition. In addition, the high working voltage will cause microcracks, leading to contact failure and repeated surface reactions. In order to solve the above problems, researchers have proposed many modification methods to deal with the decline of electrochemical performance for Ni-rich cathode materials under high voltage such as element doping, surface coating, single-crystal fabrication, structural design and multifunctional electrolyte additives. This review mainly introduces the challenges and modification strategies for Ni-rich cathode materials under high voltage operation. The future application and development trend of Ni-rich cathode materials for high specific energy LIBs are projected.

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Li-ion diffusivity and electrochemical performance of Ni-rich cathode material doped with fluoride ions

Cited by 70 publications

References 65 publications

Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries

Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries

Recent progress on the modification of high nickel content NCM: Coating, doping, and single crystallization

Challenges and Modification Strategies of Ni-Rich Cathode Materials Operating at High-Voltage

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Li-ion diffusivity and electrochemical performance of Ni-rich cathode material doped with fluoride ions

Cited by 70 publications

References 65 publications

Enhanced Cycling Performance of Fe‐doped LiMn2O4 Truncated Octahedral Cathodes for Li‐Ion Batteries

Enhanced Cycling Performance of Fe‐doped LiMn2O4 Truncated Octahedral Cathodes for Li‐Ion Batteries

Recent progress on the modification of high nickel content NCM: Coating, doping, and single crystallization

Challenges and Modification Strategies of Ni-Rich Cathode Materials Operating at High-Voltage

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Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries

Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries