High performance porous LiMnPO<sub>4</sub>nanoflakes: synthesis from a novel nanosheet precursor

Xia, Qingbo; Liu, Tao; Xu, Jingjing; Cheng, Xueyuan; Lü, Wei; Wu, Xiaodong

doi:10.1039/c5ta00114e

Cited by 21 publications

(17 citation statements)

References 29 publications

(34 reference statements)

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“…for LMFP/C and LMFP/C-F respectively, which are much stronger than that of the standard card ratio (2.64) indicating expose a large amount of (010) crystal face 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 9 In view of the limited information obtained from XRD results Raman spectroscopy was used to further confirm the structural information of products represented as Fig. 2.…”

Section: Structure and Morphology Analysismentioning

confidence: 79%

Enhanced Electrochemical Performance of LiMn_0.75Fe_0.25PO₄ Nanoplates from Multiple Interface Modification by Using Fluorine-Doped Carbon Coating

Yan

Sun

Wang

et al. 2017

ACS Sustainable Chem. Eng.

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We report a novel composite of fluorine-doped carbon decorated LiMn 0.75 Fe 0.25 PO 4 (LMFP) nanoplates synthesized via a facile method by using hybrid sucrose and polyvinylidene fluoride as carbon and fluorine sources. In the composite, the thin LMFP nanoplates expose large amounts of (010) crystal face which shortens the Li + ion diffusion distance, the fluorine-doped carbon coating layer can provide sufficient pathway for rapid electron transport, and the partially formed metal fluorides in the interface between LMFP nanoplates surface and fluorine-doped carbon coating layer will help reduce charge transfer resistance. Thanks to this unique structure, the resulting product exhibits a superior discharge capacity of 162.2 mA h g -1 at the 1 C current rate and the capacity is retained 94.8 % over 200 cycles. Furthermore, this material also can deliver a reversible capacity of 130.3 mA h g -1 at an ultrahigh current rate of 20 C, in which the discharge procedure can be accomplished only 144 s. The celerity and cycling capability of prepared material endow it with great potential for applying in high performance LIBs.

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Section: Structure and Morphology Analysismentioning

confidence: 79%

Enhanced Electrochemical Performance of LiMn_0.75Fe_0.25PO₄ Nanoplates from Multiple Interface Modification by Using Fluorine-Doped Carbon Coating

Yan

Sun

Wang

et al. 2017

ACS Sustainable Chem. Eng.

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“…Beneficial effects on the electrochemical performances are also seen by the incorporation of dopants, such as V, Fe, Ce, Ni, and Mg, that can buffer the pseudo Jahn–Teller distortion. To circumvent the effects of high electronic and ionic resistances, it is customary in the laboratory to adopt charge protocols for the cathode cycling tests (i.e., low currents and long charge times), − since a slower charging process maximizes the final achievable capacity. These conditions are however far from the realistic case in which an actual battery works and that requires fast charge processes.…”

Section: Introductionmentioning

confidence: 99%

Relevance of LiPF₆ as Etching Agent of LiMnPO₄ Colloidal Nanocrystals for High Rate Performing Li-ion Battery Cathodes

Chen¹,

Dilena²,

Paolella

et al. 2016

ACS Appl. Mater. Interfaces

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LiMnPO4 is an attractive cathode material for the next-generation high power Li-ion batteries, due to its high theoretical specific capacity (170 mA h g–1) and working voltage (4.1 V vs Li+/Li). However, two main drawbacks prevent the practical use of LiMnPO4: its low electronic conductivity and the limited lithium diffusion rate, which are responsible for the poor rate capability of the cathode. The electronic resistance is usually lowered by coating the particles with carbon, while the use of nanosize particles can alleviate the issues associated with poor ionic conductivity. It is therefore of primary importance to develop a synthetic route to LiMnPO4 nanocrystals (NCs) with controlled size and coated with a highly conductive carbon layer. We report here an effective surface etching process (using LiPF6) on colloidally synthesized LiMnPO4 NCs that makes the NCs dispersible in the aqueous glucose solution used as carbon source for the carbon coating step. Also, it is likely that the improved exposure of the NC surface to glucose facilitates the formation of a conductive carbon layer that is in intimate contact with the inorganic core, resulting in a high electronic conductivity of the electrode, as observed by us. The carbon coated etched LiMnPO4-based electrode exhibited a specific capacity of 118 mA h g–1 at 1C, with a stable cycling performance and a capacity retention of 92% after 120 cycles at different C-rates. The delivered capacities were higher than those of electrodes based on not etched carbon coated NCs, which never exceeded 30 mA h g–1. The rate capability here reported for the carbon coated etched LiMnPO4 nanocrystals represents an important result, taking into account that in the electrode formulation 80% wt is made of the active material and the adopted charge protocol is based on reasonable fast charge times.

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“…Therefore, microspherical self-assembly is considered to be a good strategy to architect advance materials for Li-ion batteries. Carbon coating is another effective way to improve the electrochemical performance of LiFe1-xMnxPO4 by compensating its low conductivity [24][25][26]. Recently, hybrid coating by carbon and graphene has been used as a high-efficient carbon coating technique for modifying olivine-structured LiFe1-…”

mentioning

confidence: 99%

Graphene encapsulated spherical hierarchical superstructures self-assembled by LiFe0.75Mn0.25PO4 nanoplates for high-performance Li-ion batteries

Mei

Yang

Song

et al. 2016

Electrochimica Acta

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the electrochemical performance of LiFe0.75Mn0.25PO4 material is further enhanced via synergistic strategies including crystal orientation growth, microspherical self-assembly and graphene encapsulation. The crystal orientation growth of LiFe0.75Mn0.25PO4 with plate-like morphology not only reduces the Li-ion transport length, but also enlarges the (010) surface, and leads to the improvement of Li-ion diffusion. The self-assembled spherical hierarchical superstructures can effectively prevent the plane-plane stacks of LiFe0.75Mn0.25PO4 nanoplates during spontaneously aggregating, providing more (010) surface for Li + insertion/extraction. The graphene encapsulation can build a 3D conductive network as well as stabilize the microspherical aggregations, resulting in superior electronic conductivity and stability. As a consequence of the synergistic effects, the as-obtained LiFe0.75Mn0.25PO4 sample exhibits excellent rate capability (141.1 mA h g-1 at 5 C, 126.5 mA h g-1 at 10 C, 107.7 mA h g-1 at 20 C) and outstanding cyclability (25 o C, 94.6% capacity retention after 500 cycles at 1 C). The synergistic strategy involving crystal orientation growth, microspherical self-assembly and graphene encapsulation provides a fascinating candidate to obtain superior olivine-type cathode materials with excellent rate capability and cycling stability, and holds the potential to be extended to the controlled preparation of other electrode materials.

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High performance porous LiMnPO₄nanoflakes: synthesis from a novel nanosheet precursor

Cited by 21 publications

References 29 publications

Enhanced Electrochemical Performance of LiMn_0.75Fe_0.25PO₄ Nanoplates from Multiple Interface Modification by Using Fluorine-Doped Carbon Coating

Enhanced Electrochemical Performance of LiMn_0.75Fe_0.25PO₄ Nanoplates from Multiple Interface Modification by Using Fluorine-Doped Carbon Coating

Relevance of LiPF₆ as Etching Agent of LiMnPO₄ Colloidal Nanocrystals for High Rate Performing Li-ion Battery Cathodes

Graphene encapsulated spherical hierarchical superstructures self-assembled by LiFe0.75Mn0.25PO4 nanoplates for high-performance Li-ion batteries

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High performance porous LiMnPO4nanoflakes: synthesis from a novel nanosheet precursor

Cited by 21 publications

References 29 publications

Enhanced Electrochemical Performance of LiMn0.75Fe0.25PO4 Nanoplates from Multiple Interface Modification by Using Fluorine-Doped Carbon Coating

Enhanced Electrochemical Performance of LiMn0.75Fe0.25PO4 Nanoplates from Multiple Interface Modification by Using Fluorine-Doped Carbon Coating

Relevance of LiPF6 as Etching Agent of LiMnPO4 Colloidal Nanocrystals for High Rate Performing Li-ion Battery Cathodes

Graphene encapsulated spherical hierarchical superstructures self-assembled by LiFe0.75Mn0.25PO4 nanoplates for high-performance Li-ion batteries

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Product

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High performance porous LiMnPO₄nanoflakes: synthesis from a novel nanosheet precursor

Enhanced Electrochemical Performance of LiMn_0.75Fe_0.25PO₄ Nanoplates from Multiple Interface Modification by Using Fluorine-Doped Carbon Coating

Enhanced Electrochemical Performance of LiMn_0.75Fe_0.25PO₄ Nanoplates from Multiple Interface Modification by Using Fluorine-Doped Carbon Coating

Relevance of LiPF₆ as Etching Agent of LiMnPO₄ Colloidal Nanocrystals for High Rate Performing Li-ion Battery Cathodes