Comparative studies between oxygen-deficient LiMn2O4 and Al-doped LiMn2O4

Chung, Kyung Yoon; Yoon, Won‐Sub; Lee, Hung Sui; Yang, Xiao‐Qing; McBreen, J.; Deng, Bohua; Wang, X.Q.; Yoshio, Masaki; Wang, R.; Gui, Jianian; Okada, Masaki

doi:10.1016/j.jpowsour.2005.03.033

Cited by 31 publications

(22 citation statements)

References 9 publications

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“…[2,3] Nevertheless, such high operating voltage of LNMO involves surface chemistry issues such as irreversible surface phase transition, transition metal dissolution, Jahn-Teller distortion of Mn 3+ , electrolyte oxidation, etc. [27][28][29] Considering the fact that side reactions predominantly happen on the surface of LNMO due to the unbalanced Li ions mobility on the boundary especially at high current densities, [30] restricting the controllable doping modification within the surface turns out to be a feasible and promising approach. These coating materials can tackle the metal dissolution, electrolyte decomposition, and Mn 3+ Jahn-Teller distortion problems by simply shielding the cathode material from direct exposure to the electrolyte.…”

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confidence: 99%

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

et al. 2017

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A novel two-step surface modification method that includes atomic layer deposition (ALD) of TiO followed by post-annealing treatment on spinel LiNi Mn O (LNMO) cathode material is developed to optimize the performance. The performance improvement can be attributed to the formation of a TiMn O (TMO)-like spinel phase resulting from the reaction of TiO with the surface LNMO. The Ti incorporation into the tetrahedral sites helps to combat the impedance growth that stems from continuous irreversible structural transition. The TMO-like spinel phase also alleviates the electrolyte decomposition during electrochemical cycling. 25 ALD cycles of TiO growth are found to be the optimized parameter toward capacity, Coulombic efficiency, stability, and rate capability enhancement. A detailed understanding of this surface modification mechanism has been demonstrated. This work provides a new insight into the atomic-scale surface structural modification using ALD and post-treatment, which is of great importance for the future design of cathode materials.

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confidence: 99%

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

et al. 2017

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“…When Mn 3þ is replaced by Mg 2þ and Al 3þ , this leads to an increase (decrease) in the number of Mn 4þ (Mn 3þ ) ions and thereby to reduced Mn dissolution. Additionally, compared with MneO bonds, the higher AleO bonding energy improves the overall structural stability of LiMn 2 O 4 against Mn dissolution [5,17]. The TR-XRD patterns obtained from fully charged and uncharged (pristine) electrodes, are shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

Effect of (Mg, Al) double doping on the thermal decomposition of LiMn2O4 cathodes investigated by time-resolved X-ray diffraction

Susanto

Kim

et al. 2015

Current Applied Physics

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“…Instability of high oxidation state of transition metal in spinel structure observed in charged state of cathode leads to oxygen evolution, similarly to the layered oxide cathodes, and reaction with electrolyte. Application of spinel based materials is limited to cheap battery packs for EV [11].…”

Section: Spinel Limn2o4 and Related Systemsmentioning

confidence: 99%