Insight into the ion-dependent capacity mismatch in alkali metal ion batteries by in situ magnetometry

Zuo, Fengkai; Zhang, Hao; Liu, Minhui; Liu, Jie; Liu, Yongshuai; Li, Yuhao; Liu, Hengjun; Gu, Fangchao; Li, Qiang; Zhao, Linyi; Yi, Chunlin; Ding, Yulong; Shen, Laifa; Li, Hongsen

doi:10.1016/j.ensm.2023.03.035

Cited by 6 publications

(1 citation statement)

References 64 publications

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“…A large number of spin-polarized electrons can be accommodated in Fe nanoparticles, leading to the generation of a spin-polarized surface capacitance, which is a crucial source of lithium storage in Fe-containing conversion-type anodes. 57,58 The HRTEM image of the sample acquired after the potential increased to 3 V is shown in Fig. 7(b); the blue and purple regions correspond to the (2 2 1) and (1 1 3) crystal planes of FeTiO 3 and Fe 2 TiO 5 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Structural evolution and lithium-storage mechanism of the FeTiO₃@Fe₂TiO₅ endogenous heterojunction

Chen,

Li,

Wang

et al. 2024

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 99%

Structural evolution and lithium-storage mechanism of the FeTiO₃@Fe₂TiO₅ endogenous heterojunction

Chen,

Li,

Wang

et al. 2024

J. Mater. Chem. C

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Reaction Mechanism and Structural Evolution of Tunnel‐Structured KCu₇S₄ Nanowires in Li⁺/Na⁺‐Ion Batteries

Zhang,

Wang,

et al. 2024

Adv Funct Materials

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Selecting suitable electrode materials for sodium‐ion batteries (SIBs) often relies on the experience gained from lithium‐ion batteries (LIBs), particularly in terms of thermodynamics. However, this approach may fall into a stagnant situation where the development of SIBs consistently lags behind that of LIBs due to the larger ionic radius of Na+. Accordingly, it is crucial to establish a dedicated selection rule specifically tailored for SIB electrodes to overcome this challenge. Herein, a screening method is proposed for SIB materials, where an ideal candidate shall form a stable intermediate transition phase with Na+. This phase acts as an important bridge that can regulate the insertion/extraction of charge carriers. Atomically resolved transmission electron microscopy demonstrates that KCu7S4 can react with Na+ to form a stable intermediate phase (Na3Cu4S4). Na3Cu4S4 can undergo reversible conversion reactions, contribute capacity, stabilize the tunnel structure and enhance the migration/diffusion of Na+. In contrast, Li+ can't form a stable intermediate phase in KCu7S4 during lithiation/delithiation, thus losing the ability to effectively regulate Li+ insertion/extraction. These findings provide valuable insights for the development of suitable electrode materials for SIBs, emphasizing the importance of stable intermediate phases in regulating charge carrier insertion/extraction and improving overall battery performance.

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Probing Electronic Structure Changes in Cobalt Oxalate Anode for Lithium‐Ion Batteries

Li,

Dai,

Liu

et al. 2024

Advanced Energy Materials

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Transition metal‐based materials exhibit a broad range of catalytic activities in numerous electrochemical processes. Their displayed catalytic functions rely essentially on their distinctive electronic structures, changes of which play pivotal roles in dictating reaction dynamics within many electrochemical devices. Nevertheless, accurately probing electronic structure changes, especially in real‐time, of active materials remains a formidable challenge. In this work, a viable approach to achieve it within a CoC2O4/Li model system by employing a combined microscopic is demonstrated, spectroscopic analysis, plus a unique operando magnetometry technique. The findings reveal that upon completion of the conventional conversion of CoC2O4, a surface‐dominated capacitance emerges at the Co/Li2C2O4 interface owing to the injection of spin‐polarized electrons. Subsequently, the decomposition of Li2C2O4 proceeds through the releasing of the spin‐polarized electrons from Co, which, therefore serve as a catalyst leading to further discharge products. Such real‐time monitoring of electron transfer is realized by in situ monitoring electronic structure changes of Co, manifested by its intriguing magnetization alterations during the process. This work highlights a novel characterization tool that provides a solid explanation for the commonly observed large capacities in this type of materials and sheds light on design rules and selection guidance of materials for high‐performance electrochemical energy storage systems.

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Insight into the ion-dependent capacity mismatch in alkali metal ion batteries by in situ magnetometry

Cited by 6 publications

References 64 publications

Structural evolution and lithium-storage mechanism of the FeTiO₃@Fe₂TiO₅ endogenous heterojunction

Structural evolution and lithium-storage mechanism of the FeTiO₃@Fe₂TiO₅ endogenous heterojunction

Reaction Mechanism and Structural Evolution of Tunnel‐Structured KCu₇S₄ Nanowires in Li⁺/Na⁺‐Ion Batteries

Probing Electronic Structure Changes in Cobalt Oxalate Anode for Lithium‐Ion Batteries

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Insight into the ion-dependent capacity mismatch in alkali metal ion batteries by in situ magnetometry

Cited by 6 publications

References 64 publications

Structural evolution and lithium-storage mechanism of the FeTiO3@Fe2TiO5 endogenous heterojunction

Structural evolution and lithium-storage mechanism of the FeTiO3@Fe2TiO5 endogenous heterojunction

Reaction Mechanism and Structural Evolution of Tunnel‐Structured KCu7S4 Nanowires in Li+/Na+‐Ion Batteries

Probing Electronic Structure Changes in Cobalt Oxalate Anode for Lithium‐Ion Batteries

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Structural evolution and lithium-storage mechanism of the FeTiO₃@Fe₂TiO₅ endogenous heterojunction

Structural evolution and lithium-storage mechanism of the FeTiO₃@Fe₂TiO₅ endogenous heterojunction

Reaction Mechanism and Structural Evolution of Tunnel‐Structured KCu₇S₄ Nanowires in Li⁺/Na⁺‐Ion Batteries