In situ electrochemical creation of cobalt oxide nanosheets with favorable performance as a high tap density anode material for lithium-ion batteries

Lin, Qian; Sha, Yujing; Zhao, Bote; Chen, Yubo; Tadé, Moses O.; Shao, Zongping

doi:10.1016/j.electacta.2015.09.052

Cited by 19 publications

(8 citation statements)

References 58 publications

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“…Recently, hierarchical micro/nanostructures have attracted considerable attention because their nano/submicron-sized primary particles can significantly shorten the pathways for Li-ions and electrons, meanwhile the micrometer-sized secondary agglomerates can achieve high volumetric energy density and long cycle life of the electrode materials. − In this regard, it is of great importance to synthesize LiCoO 2 cathode materials with hierarchical architecture toward stable LIBs system. On the other hand, fabrication of unique electrode structure with specifically exposed active lattice facets has been a fascinating approach to harvest high-performance LIBs.…”

Section: Introductionmentioning

confidence: 99%

Flakelike LiCoO₂ with Exposed {010} Facets As a Stable Cathode Material for Highly Reversible Lithium Storage

Zhang

Guo

et al. 2016

ACS Appl. Mater. Interfaces

107

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A thick and dense flakelike LiCoO2 with exposed {010} active facets is synthesized using Co(OH)2 nanoflake as a self-sacrificial template obtained from a simple coprecipitation method, and served as a cathode material for lithium ion batteries. When operated at a high cutoff voltage up to 4.5 V, the resultant LiCoO2 exhibits an outstanding rate capability, delivering a reversible discharge capacity as high as 179, 176, 168, 116, and 96 mA h g(-1) at 25 °C under the current rate of 0.1, 0.5, 1, 5, and 10 C, respectively. When charge/discharge cycling at 55 °C, a high specific capacity of 148 mA h g(-1) (∼88% retention) can be retained after 100 cycles under 1 C, demonstrating excellent cycling and thermal stability. Besides, the flakelike LiCoO2 also shows an impressive low-temperature electrochemical activity with specific capacities of 175 (0.1 C) and 154 mA h g(-1) (1 C) at -10 °C, being the highest ever reported for a subzero-temperature lithium storage capability, as well as 52% capacity retention even after 80 cycles under 1 C. Such superior high-voltage electrochemical performances of the flakelike LiCoO2 operated at a wide temperature range are mainly attributed to its unique hierarchical structure with specifically exposed facets. The exposed {010} active facets provide a preferential crystallographic orientation for Li-ion migration, while the micrometer-sized secondary particles agglomerated by submicron primary LiCoO2 flakes endow the electrode with better structural integrity, both of which ensure the LiCoO2 cathode to manifest remarkably enhanced reversible lithium storage properties.

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Section: Introductionmentioning

confidence: 99%

Flakelike LiCoO₂ with Exposed {010} Facets As a Stable Cathode Material for Highly Reversible Lithium Storage

Zhang

Guo

et al. 2016

ACS Appl. Mater. Interfaces

107

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“…This behaviour supports the assumed conversion mechanism, since a distinctly different potential profile is observed after the first (irreversible) cycle, indicating a completely different cycling mechanism. However, the reaction mechanism with the oxidation and reduction occurring both in two distinct potential ranges is different compared to the well-studied Fe oxide [24][25][26] and Co oxide [27,28] conversion materials, which especially in reduction show only one electroactive potential region in CV. This demonstrates that the organic MeDP ligand has an influence on the assumed conversion mechanism of FeMeDP and CoMeDP.…”

Section: Resultsmentioning

confidence: 83%

Fe and Co methylene diphosphonates as conversion materials for Li-ion batteries

Schmidt

Sallard

Sheptyakov

et al. 2017

Journal of Power Sources

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Organic-inorganic hybrid materials can introduce more flexibility in the choice of Li-ion battery materials due to the versatility of organic ligands. As an alternative to carboxylate-based ligands, Fe and Co methylene diphosphonate were successfully synthesised and tested as model diphosphonatebased negative electrode materials for Li-ion batteries, showing specific charges of 250 mAh g-1 and 395 mAh g-1 after 100 cycles at 50 mAh g-1 , respectively. Operando X-ray diffraction and ex situ X-ray absorption spectroscopy confirmed the expected conversion reaction mechanism involving amorphisation of the pristine materials and extrusion of transition metal particles upon reduction. Ex situ X-ray absorption spectra indicated that Fe methylene diphosphonate undergoes reversible Fe cycling between Fe(II) and Fe(0) metal particles.

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“…Ideally, compared with the traditional nanostructured cathode, the unique micro-/nanoassembled structure of the PAHF-LCO cathode can benefit tap density and lead to the high volumetric specific density, which is a significant factor determining the application potential of electrode materials. 34 From the TEM studies of Figure 3g,h, we can observe the well-defined hierarchical structure of the PAHF-LCO cathode material, which is continuously assembled from the nanoplatelets. As shown in Figure 3i,j, the crystal features of lateral and frontal planes are detected by HRTEM images and fast Fourier transform (FFT) patterns.…”

Section: ■ Results and Discussionmentioning

confidence: 90%

Hierarchical Fusiform Microrods Constructed by Parallelly Arranged Nanoplatelets of LiCoO₂ Material with Ultrahigh Rate Performance

Zhou

Mei

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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The past few decades have witnessed the unprecedented success of the commercialized LiCoO2 layered cathode in consumer electronics, but it still faces the poor rate capability and cycling performance because of its hexagonal layered α-NaFeO2 structure and the high energy of electrochemically active crystal planes. In a bid to address these problems, we report the delicate design and synthesis of hierarchical fusiform LiCoO2 microrods constructed by directionally assembled nanoplatelets along the [001] direction via a self-template route (PAHF-LCO). Remarkably, it is the first time that almost all the exposed surfaces of layered cathodes are dominated by the consistent {010} facets, which enable the express channels of Li+ diffusion to penetrate throughout the entire fusiform microrods. The as-obtained PAHF-LCO cathode material delivers specific capacities of 113 and 106 mA h g–1 at 10 and 20 C after 200 cycles, respectively. Even under the high rate of 50 C, the discharge capacity initializes around 105 mA h g–1 and ends around 80 mA h g–1 after 200 cycles. The improvement mechanisms to the high-rate performance through crystal habit tuning have also been unraveled. The enhanced electrochemical performance can be attributed to the hierarchical fusiform structure as well as the coordinated crystal orientation of {010} facets.

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In situ electrochemical creation of cobalt oxide nanosheets with favorable performance as a high tap density anode material for lithium-ion batteries

Cited by 19 publications

References 58 publications

Flakelike LiCoO₂ with Exposed {010} Facets As a Stable Cathode Material for Highly Reversible Lithium Storage

Flakelike LiCoO₂ with Exposed {010} Facets As a Stable Cathode Material for Highly Reversible Lithium Storage

Fe and Co methylene diphosphonates as conversion materials for Li-ion batteries

Hierarchical Fusiform Microrods Constructed by Parallelly Arranged Nanoplatelets of LiCoO₂ Material with Ultrahigh Rate Performance

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In situ electrochemical creation of cobalt oxide nanosheets with favorable performance as a high tap density anode material for lithium-ion batteries

Cited by 19 publications

References 58 publications

Flakelike LiCoO2 with Exposed {010} Facets As a Stable Cathode Material for Highly Reversible Lithium Storage

Flakelike LiCoO2 with Exposed {010} Facets As a Stable Cathode Material for Highly Reversible Lithium Storage

Fe and Co methylene diphosphonates as conversion materials for Li-ion batteries

Hierarchical Fusiform Microrods Constructed by Parallelly Arranged Nanoplatelets of LiCoO2 Material with Ultrahigh Rate Performance

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Flakelike LiCoO₂ with Exposed {010} Facets As a Stable Cathode Material for Highly Reversible Lithium Storage

Flakelike LiCoO₂ with Exposed {010} Facets As a Stable Cathode Material for Highly Reversible Lithium Storage

Hierarchical Fusiform Microrods Constructed by Parallelly Arranged Nanoplatelets of LiCoO₂ Material with Ultrahigh Rate Performance