Specific countermeasures to intrinsic capacity decline issues and future direction of LiMn2O4 cathode

Hou, Xudong; Liu, Xuguang; Wang, Huan; Zhang, Xian‐Ming; Zhou, Jiadong; Wang, Meiling

doi:10.1016/j.ensm.2023.02.015

Cited by 42 publications

(29 citation statements)

References 254 publications

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“…[ 34,49–53 ] Besides, the surface coating, foreign ion doping, nanostructure, and morphology optimization were also employed to suppress their intrinsic capacity fading. [ 54 ] The comparison of this work with the data of these previous reports is given in Table S3 (Supporting Information). Compared with these reported studies, the single crystal LiMn 2 O 4 with exposed {111}, {100}, and {110} facets shows longer cycle life exceeding 2000 cycles at room temperature and better cycling stability at high working temperature.…”

Section: Resultsmentioning

confidence: 89%

General Synthesis of Single‐Crystal Spinel Cathodes with the Tailored Orientation of Exposed Crystal Planes for Advanced Lithium‐Ion Batteries

Hou

Lin

Liu

et al. 2023

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The spinel Mn‐based cathodes with 3D Li+ diffusion channels, high voltage, and low‐cost show promise for developing high‐power lithium‐ion batteries (LIBs). But the disproportionation and Jahn–Teller distortion lead to structural degeneration and capacity decay, especially at high working temperatures. Herein, considering the merits of single crystals and orientation of exposed crystal planes, single‐crystal truncated octahedral LiMn2O4 (TO‐LMO) with exposed {111}, {100} and {110} facets is rationally designed, in which the mainly exposed {111} facets are truncated by a small portion of {100} and {110} facets. The Li‐deficient intermediate phase is innovatively proposed to prepare the single‐crystal TO‐LMO. The synergistic effects of single crystals and the orientation of exposed crystal planes significantly reduce the disproportionation of Mn3+ ions and thereby improve their structural stability. Consequently, the cycling stability of the single‐crystal TO‐LMO is remarkably enhanced, obtaining outstanding capacity retention of 84.3% after 2000 cycles, much better than that of 61.2% for octahedral LiMn2O4. The feasibility of preparing single‐crystal truncated octahedral LiNi0.5Mn1.5O4 with exposed {111}, {100}, and {110} facets via the Li‐deficient intermediate phase is further demonstrated. These findings offer new insight into regulating the orientation of exposed crystal planes and improving the reversibility of Mn‐based redox couples in LIBs.

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Section: Resultsmentioning

confidence: 89%

General Synthesis of Single‐Crystal Spinel Cathodes with the Tailored Orientation of Exposed Crystal Planes for Advanced Lithium‐Ion Batteries

Hou

Lin

Liu

et al. 2023

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“…LMO compounds have the unoccupied octahedral site (16c) and the formula can be denoted as [Li + ] 8a [Mn 3+ –Mn 4+ ] 16d [□] 16c [O 4 ] 32e (□ represents the octahedral vacancy). 32 The [Mn 2 ] 16d [□] 16c [O 4 ] 32e skeleton is a three-dimensional network of tetrahedral and octahedral coplanar structures, which benefit fast lithium-ion diffusion. Additional lithium ions can intercalate into the empty 16c octahedral sites in the LMO structure, allowing LMO to transform into Li 2 Mn 2 O 4 (L 2 MO) and enabling the application of pre-lithiation strategies.…”

Section: Resultsmentioning

confidence: 99%

“…Li-ions at the 8a site continuously insert into empty 16c octahedral sites during the rst discharge process, and then the cubic spinel converts to a tetragonal spinel L 2 MO. 1,32 Besides, high-resolution transmission electron microscopy (HRTEM) and in situ X-ray diffraction (XRD) were carried out to visually demonstrate the phase transition between LMO and L 2 MO during the whole charge-discharge cycling process (Fig. 1c-e).…”

Section: Resultsmentioning

confidence: 99%

Enhancing the cycle-life of initial-anode-free lithium-metal batteries by pre-lithiation in Mn-based Li-rich spinel cathodes

et al. 2023

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“…Furthermore, the dissolution of TM ions (for example, the disproportionation reaction of 2Mn 3+ → Mn 2+ + Mn 4+ ) and the accompanying nano‐cracks are also responsible for capacity losses. [ 128 ] The dissolution of TMs results in the collapse of the layered structure, accompanied by the migration and deposition of these metals on the anode, which act as catalysts for electrolyte decomposition. [ 129 ] Therefore, the described above surface chemical process is the key reason for the inferior electrochemical performance of layered oxides (Figure 4e).…”

Section: O3‐tye Layered Oxide Cathodesmentioning

confidence: 99%

Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

Liang,

Hwang,

Sun

2023

Advanced Energy Materials

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In recent decades, sodium‐ion batteries (SIBs) have received increasing attention because they offer cost and safety advantages and avoid the challenges related to limited lithium/cobalt/nickel resources and environmental pollution. Because the sodium storage performance and production cost of SIBs are dominated by the cathode performance, developing cathode materials with large‐scale production capacity is the key to achieving commercial applications of SIBs. Therefore, developing host materials with high energy density, long cycling life, low production cost, and high chemical/environmental stability is crucial for implementing advanced SIBs. Among the developed cathode materials for SIBs, O3‐type sodiated transition‐metal oxides have attracted extensive attention owing to their simple synthesis methods, high theoretical specific capacity, and sufficient Na content. However, the relatively large Na‐ion radius leads to sluggish diffusion kinetics and inevitable complex phase transitions during the deintercalation/intercalation process, resulting in poor rate capability and cycling stability. Therefore, this review comprehensively summarizes the research progress and modification strategies for O3‐type cathodes, including the component design, surface modification, and optimization of synthesis methods. This work aims to guide the development of commercial layered oxides and provide technical support for the next generation of energy‐storage systems.

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Specific countermeasures to intrinsic capacity decline issues and future direction of LiMn2O4 cathode

Cited by 42 publications

References 254 publications

General Synthesis of Single‐Crystal Spinel Cathodes with the Tailored Orientation of Exposed Crystal Planes for Advanced Lithium‐Ion Batteries

General Synthesis of Single‐Crystal Spinel Cathodes with the Tailored Orientation of Exposed Crystal Planes for Advanced Lithium‐Ion Batteries

Enhancing the cycle-life of initial-anode-free lithium-metal batteries by pre-lithiation in Mn-based Li-rich spinel cathodes

Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

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