Scalable Preparation of LiFePO<sub>4</sub>/C Nanocomposites with sp<sup>2</sup>‐Coordinated Carbon Coating as High‐Performance Cathode Materials for Lithium‐Ion Batteries

Kretschmer, Katja; Sun, Bing; Su, Dawei; Zhao, Yufei; Wang, Guoxiu

doi:10.1002/celc.201500262

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…Many attempts have been made to overcome these limiting factors in olivine type materials for batteries. The poor electronic conductivity is usually improved by carbon coating, ,− while working with nanosized crystals helps to reduce the Li + diffusion length − and consequently improves the ionic conductivity. 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.…”

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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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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“…The relatively high intensity ratio might indicate a more disordered structure . The integrated area ratio of the sp 3 and sp 2 bands ( A sp 3 / A sp 2 ) is associated with the relative content of graphitic carbon and an indication of conductivity . A lower area ratio indicates higher electronic conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…[44] The integrated area ratio of the sp 3 and sp 2 bands (A sp 3 /A sp 2 )i sa ssociated with the relative content of graphitic carbon and an indication of conductivity. [45,46] Al ower area ratio indicates higher electronic conductivity.T he calculated A sp 3 /A sp 2 ratio of these porousc arbon nanosheets is 0.41, suggesting improved electrical conductivity.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen‐Doped Porous Carbon Nanosheets from Eco‐Friendly Eucalyptus Leaves as High Performance Electrode Materials for Supercapacitors and Lithium Ion Batteries

Mondal

Kretschmer

Zhao

et al. 2017

Chemistry A European J

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140

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Nitrogen-doped porous carbon nanosheets were prepared from eucalyptus tree leaves by simply mixing the leaf powders with KHCO and subsequent carbonisation. Porous carbon nanosheets with a high specific surface area of 2133 m g were obtained and applied as electrode materials for supercapacitors and lithium ion batteries. For supercapacitor applications, the porous carbon nanosheet electrode exhibited a supercapacitance of 372 F g at a current density of 500 mA g in 1 m H SO aqueous electrolyte and excellent cycling stability over 15 000 cycles. In organic electrolyte, the nanosheet electrode showed a specific capacitance of 71 F g at a current density of 2 Ag and stable cycling performance. When applied as the anode material for lithium ion batteries, the as-prepared porous carbon nanosheets also demonstrated a high specific capacity of 819 mA h g at a current density of 100 mA g , good rate capability, and stable cycling performance. The outstanding electrochemical performances for both supercapacitors and lithium ion batteries are derived from the large specific surface area, porous nanosheet structure and nitrogen doping effects. The strategy developed in this paper provides a novel route to utilise biomass-derived materials for low-cost energy storage systems.

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“…Over the past decades, the lithium‐ion batteries (LIBs) have attracted great attention and been widely applied in grid‐scale energy storage systems (ESSs), electric vehicles (EVs) and consumer electronics . To achieve high energy and power density LIBs, the designing and fabricating electrodes are essential attempts . In pursuit of electrodes of higher energy density, a minimal use of electrochemically inactive materials including metallic current collectors, polymer binders and conductive additives is highly desired .…”

Section: Figurementioning

confidence: 99%

General Airbrush‐Spraying/Electrospinning Strategy for Ultrahigh Areal‐Capacity LiFePO₄‐Based Cathodes

Huang

Pan

et al. 2018

ChemElectroChem

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A versatile electrode fabrication strategy based on electrospinning combined with airbrush–spraying (ECAS) is developed for the preparation of composite paper electrodes. The LiFePO4 paper electrodes (ca. 13 mg cm−2) display good cycling stability with a capacity decay of only 15 % over 300 cycles at 1 C for lithium‐ion batteries. It is also demonstrated that the ECAS technique can obtain ultrahigh areal capacities of 12.3 mAh cm−2 using electrodes with an extra‐high areal loading of LiFePO4 paper (>75 mg cm−2). A full cell is constructed with ECAS LiFePO4 paper as the cathode and ECAS Li4Ti5O12 paper as the anode.

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Scalable Preparation of LiFePO₄/C Nanocomposites with sp²‐Coordinated Carbon Coating as High‐Performance Cathode Materials for Lithium‐Ion Batteries

Cited by 11 publications

References 43 publications

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

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

Nitrogen‐Doped Porous Carbon Nanosheets from Eco‐Friendly Eucalyptus Leaves as High Performance Electrode Materials for Supercapacitors and Lithium Ion Batteries

General Airbrush‐Spraying/Electrospinning Strategy for Ultrahigh Areal‐Capacity LiFePO₄‐Based Cathodes

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Scalable Preparation of LiFePO4/C Nanocomposites with sp2‐Coordinated Carbon Coating as High‐Performance Cathode Materials for Lithium‐Ion Batteries

Cited by 11 publications

References 43 publications

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

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

Nitrogen‐Doped Porous Carbon Nanosheets from Eco‐Friendly Eucalyptus Leaves as High Performance Electrode Materials for Supercapacitors and Lithium Ion Batteries

General Airbrush‐Spraying/Electrospinning Strategy for Ultrahigh Areal‐Capacity LiFePO4‐Based Cathodes

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Scalable Preparation of LiFePO₄/C Nanocomposites with sp²‐Coordinated Carbon Coating as High‐Performance Cathode Materials for Lithium‐Ion Batteries

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

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

General Airbrush‐Spraying/Electrospinning Strategy for Ultrahigh Areal‐Capacity LiFePO₄‐Based Cathodes