Promoting long-term cycling performance of high-voltage Li<sub>2</sub>CoPO<sub>4</sub>F by the stabilization of electrode/electrolyte interface

Wu, Xiaobiao; Wang, Sihui; Lin, Xiaochen; Zhong, Guiming; Gong, Zhengliang; Yang, Yong

doi:10.1039/c3ta13801a

Cited by 39 publications

(35 citation statements)

References 37 publications

(51 reference statements)

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“…[6][7][8] By coating Li 2 CoPO 4 F particles with Li 3 PO 4 , Al 2 O 3 or ZrO 2 or decreasing the particle size this drawback can be overcome. [10][11][12] Herein, we report the preparation of Li 2 CoPO 4 F composed of small particles via the direct conversion of a sub-micrometer particle mixture of LiCoPO 4 and LiF, which in turn was prepared by a solvothermal one-step reaction.…”

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confidence: 99%

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

Schoiber

Berger

Yada

et al. 2015

J. Electrochem. Soc.

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Li 2 CoPO 4 F has been synthesized via a novel two-step reaction from a solvothermally prepared precursor mixture of LiCoPO 4 and LiF. Solvent influences were monitored by powder X-ray diffraction and the reaction conditions for the conversion of the precursor mixture to Li 2 CoPO 4 F were optimized. In addition, the obtained materials were characterized before and after carbon-coating by SEM, N 2 sorption, elemental and thermogravimetric analysis. The electrochemical performance of the products as high-voltage cathode materials in a coin-cell was tested, and long term stability over 50 charge/discharge cycles could be demonstrated.

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confidence: 99%

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

Schoiber

Berger

Yada

et al. 2015

J. Electrochem. Soc.

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“…The Co is in 4a and 4b sites, the P in two sets of 4c sites, the F in two sets of 4c sites, and the O in four sets of 4c and two sets of 8d sites6. The cross linked structure forms an opened 3D framework, permitting Li ions to be inserted and extracted from multiple directions151617. The XRD pattern of the synthesized Li 2 CoPO 4 F sample shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the energy density of safer Li-ion batteries by combining high-voltage lithium cobalt fluorophosphate cathodes and nanostructured titania anodes

López

McDonald

et al. 2016

Sci Rep

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Recently, Li-ion batteries have been heavily scrutinized because of the apparent incompatibility between safety and high energy density. This work report a high voltage full battery made with TiO2/Li3PO4/Li2CoPO4F. The Li2CoPO4F cathode and TiO2 anode materials are synthesized by a sol–gel and anodization methods, respectively. X-ray diffraction (XRD) analysis confirmed that Li2CoPO4F is well-crystallized in orthorhombic crystal structure with Pnma space group. The Li3PO4-coated anode was successfully deposited as shown by the (011) lattice fringes of anatase TiO2 and (200) of γ-Li3PO4, as detected by HRTEM. The charge profile of Li2CoPO4F versus lithium shows a plateau at 5.0 V, revealing its importance as potentially high-voltage cathode and could perfectly fit with the plateau of anatase anode (1.8–1.9 V). The full cell made with TiO2/Li3PO4/Li2CoPO4F delivered an initial reversible capacity of 150 mA h g−1 at C rate with good cyclic performance at an average potential of 3.1–3.2 V. Thus, the full cell provides an energy density of 472 W h kg−1. This full battery behaves better than TiO2/Li2CoPO4F. The introduction of Li3PO4 as buffer layer is expected to help the cyclability of the electrodes as it allows a rapid Li-ion transport.

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“…Furthermore, this Li 2 CoPO 4 F exhibits excellent rate capability, with an 86 % retention of the capacity at 1 C achieved at 20 C. However, Li 2 CoPO 4 F suffers from poor cycling performance, due to a high working voltage and the powerful catalytic effects of cobalt. Techniques such as employing a high voltage electrolyte, surface modification and using film-forming electrolyte additives have been applied to improve the cycling performance [63,66,67]. Our group used Li 3 PO 4 coating and the LiBOB electrolyte additive to stabilize the electrode/electrolyte interface [67].…”

Section: Fluorophosphatesmentioning

confidence: 99%

“…Techniques such as employing a high voltage electrolyte, surface modification and using film-forming electrolyte additives have been applied to improve the cycling performance [63,66,67]. Our group used Li 3 PO 4 coating and the LiBOB electrolyte additive to stabilize the electrode/electrolyte interface [67]. With the proper modifications, the Li 2 CoPO 4 F cathode material can show excellent long-term cycling performance, with an 83.8 % capacity retention after 150 cycles at a 1 C current rate, as shown in Fig.…”

Section: Fluorophosphatesmentioning

confidence: 99%

Polyanion Compounds as Cathode Materials for Li-Ion Batteries

Guo

et al. 2015

Rechargeable Batteries

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The development of high energy density Li-ion batteries depends on finding electrode materials that can meet increasingly stringent demands, in particular cathode materials [1,2]. Cathodes are not only the primary factor producing the working potential of Li-ion batteries, but also determine the number of Li ions (i.e., the practical capacity) which can be utilized. Due to LiFePO 4 having succeeded as a prime example of high powered Li-ion battery material, polyanion-type compounds have attracted wide interests in the field of cathode research for the last two decades. Although polyanion compounds exhibit disadvantages of weight and volume (i.e., they have smaller theoretical gravimetric or volumetric capacities) compared with layered oxide compounds, their inherent advantages are also clear. They have very stable frameworks that provide long-term structural stability, which is essential for extensive cycling and combating safety issues. In addition, the chemical nature of polyanions allows the monitoring of a given M n+ /M (n−1)+ redox couple through the inductive effect introduced by Goodenough [3,4], and gives rise to higher voltage values versus Li + /Li 0 than in oxides. Finally, a large number of atomic arrangements and crystal structures can be adopted by polyanion compounds, which have an extreme versatility with respect to cation and anion substitutions for a given structural type.In the last two decades, compounds with different polyanion groups such as phosphates (PO 4 3− ), pyrophosphates (P 2 O 7 4− ), silicates(SiO 4 4− ), sulfates(SO 4 2− ), borates (BO 3 3− ) as well as their fluorinated compounds have been widely investigated in the literature. In this chapter, some recent studies of polyanion compounds for use in Li-ion batteries are introduced and summarized. Some review papers in this field can also be found in the literature [5,6]. Here, we mainly focus on the different polyanion compounds in use as cathode materials, except for olivine-type LiFePO 4 and its analogues.

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Promoting long-term cycling performance of high-voltage Li₂CoPO₄F by the stabilization of electrode/electrolyte interface

Cited by 39 publications

References 37 publications

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

Enhancing the energy density of safer Li-ion batteries by combining high-voltage lithium cobalt fluorophosphate cathodes and nanostructured titania anodes

Polyanion Compounds as Cathode Materials for Li-Ion Batteries

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Promoting long-term cycling performance of high-voltage Li2CoPO4F by the stabilization of electrode/electrolyte interface

Cited by 39 publications

References 37 publications

A Two-Step Synthesis for Li2CoPO4F as High-Voltage Cathode Material

A Two-Step Synthesis for Li2CoPO4F as High-Voltage Cathode Material

Enhancing the energy density of safer Li-ion batteries by combining high-voltage lithium cobalt fluorophosphate cathodes and nanostructured titania anodes

Polyanion Compounds as Cathode Materials for Li-Ion Batteries

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Promoting long-term cycling performance of high-voltage Li₂CoPO₄F by the stabilization of electrode/electrolyte interface

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material