Enhanced electrochemical performance of LiNi0.83Co0.12Mn0.05O2 cathodes with a fast-ion conductor Li0.33La0.56TiO3 coating layer

Wu, Yonglin; Cui, Hongdi; Liu, Xiaojuan; Zhong, Xiaohui; Li, Zhifeng; Wang, Chunxiang; Dmytro, Sydorov

doi:10.1007/s10008-023-05451-8

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…The reduction in the Li + diffusion coefficient of NCM9055 may be attributed to the accumulation of side reaction products at the interface between the electrode and electrolyte and degradation of the layered structure. 41 Conversely, the co-doping of Mg/Ti serves to reduce surface side reactions and effectively preserves the layered structure, thereby facilitating rapid lithium-ion transport and maintaining the cathode's rate capability.…”

Section: Resultsmentioning

confidence: 99%

Revealing the Impact of Dual Site Modification on the Phase Transformation and Ion Transport Mechanism of Ni-Rich Cathode Materials

Zhang,

Cao,

Lin

et al. 2024

ACS Appl. Mater. Interfaces

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Ni-rich cathode materials have garnered significant attention attributable to the high reversible capacity and superior rate performance, particularly in the electric vehicle industry. However, the structural degradation experienced during cycling results in rapid capacity decay and deterioration of the rate performance, thereby impeding the widespread application of Ni-rich cathodes. Herein, a Mg/Ti co-doping strategy was developed to boost the structure stability and Li-ion transport kinetics of the Ni-rich cathode material LiNi 0.90 Co 0.05 Mn 0.05 O 2 (NCM9055) under long cycle. It is demonstrated that the Mg 2+ ions inserted into the lithium layer could serve as pillars, enhancing the stability of the delithiated layer structure. The introduction of robust Ti−O bonding mitigated the detrimental H2−H3 phase transition (∼4.2 V) during cycling. In addition, despite the fact that Mg/Ti co-doping slightly reduces Li + diffusion coefficient in the modified cathode material (NCM9055-MT), it effectively stabilized the robustness of the layered structure and maintained the Li + diffusion channel while charging and discharging, thereby improving the Li + diffusion coefficient after a long cycle. Therefore, the Mg/Ti co-doped cathode materials exhibited an exceptional capacity retention rate of 99.9% (100 cycles, 1 C). Additionally, the Li + diffusion coefficient of the co-doped NCM9055-MT (2.924 × 10 −10 cm 2 s −1 ) after 100 cycles was effectively enhanced compared with the case of undoped NCM9055 (4.806 × 10 −11 cm 2 s −1 ). This work demonstrates that the Mg/Ti co-doping approach effectively enhanced the stability of layered Ni-rich cathode materials.

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Section: Resultsmentioning

confidence: 99%

Revealing the Impact of Dual Site Modification on the Phase Transformation and Ion Transport Mechanism of Ni-Rich Cathode Materials

Zhang,

Cao,

Lin

et al. 2024

ACS Appl. Mater. Interfaces

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“…23 The oxidative stability limit of LLTO is, however, less investigated. It was demonstrated that surface coating with a thin LLTO layer could improve the stability of the cathode material LiNi 0.8 Co 0.15 Al 0.05 O 2 , 26 or LiNi 0.83 Co 0.12 Mn 0.05 O 2 27 by enhancing cycling performance and charge transfer kinetics at potentials up to at least 4.2 V vs Li 0 . This suggests that the operational oxidative stability window is larger than the phase decomposition calculations indicate.…”

mentioning

confidence: 99%

Electrochemical Stability Window and Electrolyte Breakdown Mechanisms of Lithium Lanthanum Titanate

Ring,

Laa,

Limbeck

et al. 2023

J. Electrochem. Soc.

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Li0.29La0.57TiO3 (LLTO) is a promising solid electrolyte material with a high Li-ion conductivity. However, its experimental electrochemical stability window is not precisely known, and thus the compatibility with potential electrode materials is partly unclear. In this contribution, we present results from electrochemical and analytical experiments to elucidate the stability of LLTO when being polarized with Li-ion-blocking Pt electrodes. Above 2.5 V, a darkened color front starts moving from the cathode to the anode, leading to electrolyte degradation. While first-principles calculation predict appearance of new phases as decomposition products, we find zones with modified defect chemical properties originating from the anode and cathode. The darkened zone forming at the cathode contains Ti3+ polarons with high mobility, which leads to a mixed ion-electron conductivity, already for a very small Li excess concentration. Next to the anode a spatially very confined, weakly conductive Li depletion zone forms. The spatially confined but substantial Li depletion near the anode could be quantified by analytical laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). In contrast to first-principles calculations no new phases were found near the anode, according to synchrotron-based grazing incidence XRD measurements.

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Integrated hierarchical lanthanum niobium oxide surface coating to stabilize high-voltage performance and suppress Ni2+/Li+ cationic disorder in nickel-rich layered cathodes

Jeevanantham,

Shobana

2024

Journal of Energy Storage

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Enhanced electrochemical performance of LiNi0.83Co0.12Mn0.05O2 cathodes with a fast-ion conductor Li0.33La0.56TiO3 coating layer

Cited by 3 publications

References 42 publications

Revealing the Impact of Dual Site Modification on the Phase Transformation and Ion Transport Mechanism of Ni-Rich Cathode Materials

Revealing the Impact of Dual Site Modification on the Phase Transformation and Ion Transport Mechanism of Ni-Rich Cathode Materials

Electrochemical Stability Window and Electrolyte Breakdown Mechanisms of Lithium Lanthanum Titanate

Integrated hierarchical lanthanum niobium oxide surface coating to stabilize high-voltage performance and suppress Ni2+/Li+ cationic disorder in nickel-rich layered cathodes

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