Optimization of LiFePO4 cathode material based on phosphorus doped graphite network structure for lithium ion batteries

Li, Chunlei; Xie, Yingchun; Zhang, Ningshuang; Ai, Ling; Liang, Youwei; Tuo, Kuanyou; Ye, Xiushen; Jia, Guofeng; Li, Shiyou

doi:10.1007/s11581-018-2744-7

Cited by 22 publications

(8 citation statements)

References 42 publications

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“…To verify whether the B and P elements were doped into the coatings on the LFMP surface successfully, the XPS tests were carried out and the XPS data were fitted using Avantage software (Figure ). In the C 1s spectra (Figure a1–c1), the two peaks at 284.76 and 285.75 eV are related to C–C and C–O bonds, corresponding to the carbon coatings, respectively . For LFMP@B–C and LFMP@B/P–C, the peaks at 283.65 and 284.23 eV are attributed to the C–B bond and the C–P bond from B- and P-doped carbon coating, respectively. , In the P 2p spectra, as shown in Figure a2–c2, the peaks of 133.48 and 134.28 eV are associated with the P–O/PO bond of a PO 4 3– radical in the LFMP material, while the peak at the position of 132.8 eV belongs to the P–C bond formed in LFMP@B/P–C because of the existence of P-doped carbon coating .…”

Section: Resultsmentioning

confidence: 93%

“…In addition, P atoms can bond with the carbon coating on the surface and/or oxygen atoms in the material bulk. Therefore, the structural stability between the surface carbon coating and the bulk of materials can be enhanced by the introduction of P in the carbon layer. ,,− Nowadays, many researchers have found that better electrochemical performance can be achieved by multielement doping modification compared with the modification of single-element-doped carbon coating, which is mainly attributed to the synergistic effect of heteroatoms. − However, up to now, it is rarely reported for improving the performance of LiMPO 4 material via the B and P codoped carbon coating.…”

Section: Introductionmentioning

confidence: 99%

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Boron and Phosphorus Dual-Doped Carbon Coating Improves Electrochemical Performances of LiFe_0.8Mn_0.2PO₄ Cathode Materials

Tuo

Mao

Ding

et al. 2021

ACS Appl. Energy Mater.

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Although LiMPO4 (M = Fe, Mn) cathode materials have been widely applied in electric vehicles owing to the advantages of excellent safety, cycle stability, and low cost, poor electronic conductivity of LiMPO4 severely limits the further expansion of its applied field. Herein, the LiFe0.8Mn0.2PO4 composite with boron/phosphorus dual-doped carbon coating (LFMP@B/P–C) was fabricated by a sol–gel hydrothermal method. As a result, LFMP@B/P–C exhibits superior rate performance (97.1 mAh g–1 at 20 C) and preferable low-temperature performance (78.2 mAh g–1 at 1 C and −20 °C). It is mainly attributed to the synergistic effect of boron/phosphorus dual-doped carbon coatings, as confirmed by combined experimental characterizations with density functional theory calculations. That is, boron-doped carbon coating offers additional hole carriers, and phosphorus doping provides abundant electron carriers, making it easy for electrons to escape and enter and greatly improving the conductivity of the material. In addition, the phosphorus atom also acts as a bridge so that the carbon coating layer is tightly coated on the surface of the material. This will provide an idea for the research on the modification of cathode materials in the future.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Boron and Phosphorus Dual-Doped Carbon Coating Improves Electrochemical Performances of LiFe_0.8Mn_0.2PO₄ Cathode Materials

Tuo

Mao

Ding

et al. 2021

ACS Appl. Energy Mater.

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“…The absence of typical carbon diffraction peaks indicates that the carbon coatings are amorphous. At the end of the cycling protocol, the LFP diffraction peaks exposed the formation of impurity phases, namely Li 3 PO 4 , Fe 2 O 3, and FeP 2 (Figure S8c), stemming from the Fe deficiency in the LiFePO 4 crystal lattice, [55] which in turn, explains the capacity fading within high C-rates.…”

Section: Lfp-li Half-cellmentioning

confidence: 99%

“Less is More′′: Ultra Low LiPF₆ Concentrated Electrolyte for Efficient Li‐Ion Batteries

Nikiforidis

Anouti

2021

Batteries & Supercaps

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In the pursuit of lowering the cost of lithium-ion (LIB) and lithium-metal batteries (LMB), we reduced the lithium salt concentration of the electrolyte (i. e., lithium hexafluorophosphate LiPF 6 ) to a record low 0.1 mol L À 1 LiPF 6 . Herein we present the performance of lithium nickel manganese cobalt oxide (NMC), lithium manganese oxide (LMO), lithium iron phosphate (LFP) cathodes together with graphite and lithium metal anodes in a ternary solvent mixture of ethylene carbonate (EC), ethyl methyl carbonate (EMC), and 1,1,2,2-tetrafluoroethyl 2,2,2trifluoroethyl ether (TFE) (3EC/7EMC/20TFE, by weight) containing 0.1 mol L À 1 LiPF 6 . By virtue of the favored ionic associations between Li + and PF 6À in the presence of the TFE together with EC and EMC, the half and full coin cells revealed a robust performance at room temperature with high specific capacities and coulombic efficiencies (> 98.5 %) over a wide current range (C/2!2C), high capacity retention, modest energy density (180 to 207 Wh kg À 1 depending on the system), extended calendar life (600 h for the Li symmetric cells), and superior operation to cells using commercial carbonate electrolytes (i. e., 1 mol L À 1 LiPF 6 in EC/EMC, 3/7, v/v). The morphological characterization of the electrodes revealed mild structural degradation, homogenous distribution of the electrode and electrolyte-based elements, as well as the formation of decomposition products, especially for the graphite anode. Overall, this study attests to the compatibility of low-concentrated Li salt electrolytes with promising cathode and anode materials for efficient and costeffective battery systems.

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“…The hydrothermal management characteristics in this process determine the output performance of the fuel cell. [23][24][25] At À20 C, the ionic conductivity was 0.52 and 0.45 S/m, respectively, with 2%DTA and without additives. After 100 cycles, the battery capacity was 94.8% and 88.7%, respectively compared with the first cycle at À20 C. In addition, the ionic conductivity is the main limiting factor for low-temperature performance of electrolytes in LiFePO 4 /Li cell, while factors related with electrolyteinterface are more crucial in graphite/Li cell than in LiFePO4/Li cell.…”

Section: Introductionmentioning

confidence: 99%

“…The low‐temperature start‐up process refers to the process of starting the fuel cell from a lower initial temperature to a stable working state. The hydrothermal management characteristics in this process determine the output performance of the fuel cell 23‐25 . At −20°C, the ionic conductivity was 0.52 and 0.45 S/m, respectively, with 2%DTA and without additives.…”

Section: Introductionmentioning

confidence: 99%

Research on the influence of electrolytes on the low‐temperature start‐up performance of zinc‐air battery for forklifts

Zhang

Tong

2021

Intl J of Energy Research

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In order to promote the widespread use of zinc-air batteries, operating in various extreme temperature regions around the world needs to further improve the cold start capability. It is very important to solve the problem of cold start by studying the physical phenomena in the battery during cold start and clarifying the mechanism of hindering cold start. In this study, we have researched the internal behavior in zinc-air batteries at different starting currents and temperatures during cold start. Experiments have found that 5 mol/L electrolytes freeze into ice after freezing at À30 C, while 6 to 9 mol/L solutions are still liquid after freezing. At the same electrolyte concentration, the lower the temperature, the higher the open-circuit voltage. The results show that the temperature has no obvious effect on the discharge voltage at low-current density, but has a great effect at high-current density. After several freeze-thaw cycles, cracks appear on the surface of the catalyst layer, which has a negative effect on the hydrophobicity of the gas diffusion layer. Additives can improve the interfacial ion transport performance and provide a direction for future additive research, which is very important for the practical application of water-based zinc-air batteries.

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Optimization of LiFePO4 cathode material based on phosphorus doped graphite network structure for lithium ion batteries

Cited by 22 publications

References 42 publications

Boron and Phosphorus Dual-Doped Carbon Coating Improves Electrochemical Performances of LiFe_0.8Mn_0.2PO₄ Cathode Materials

Boron and Phosphorus Dual-Doped Carbon Coating Improves Electrochemical Performances of LiFe_0.8Mn_0.2PO₄ Cathode Materials

“Less is More′′: Ultra Low LiPF₆ Concentrated Electrolyte for Efficient Li‐Ion Batteries

Research on the influence of electrolytes on the low‐temperature start‐up performance of zinc‐air battery for forklifts

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Optimization of LiFePO4 cathode material based on phosphorus doped graphite network structure for lithium ion batteries

Cited by 22 publications

References 42 publications

Boron and Phosphorus Dual-Doped Carbon Coating Improves Electrochemical Performances of LiFe0.8Mn0.2PO4 Cathode Materials

Boron and Phosphorus Dual-Doped Carbon Coating Improves Electrochemical Performances of LiFe0.8Mn0.2PO4 Cathode Materials

“Less is More′′: Ultra Low LiPF6 Concentrated Electrolyte for Efficient Li‐Ion Batteries

Research on the influence of electrolytes on the low‐temperature start‐up performance of zinc‐air battery for forklifts

Contact Info

Product

Resources

About

Boron and Phosphorus Dual-Doped Carbon Coating Improves Electrochemical Performances of LiFe_0.8Mn_0.2PO₄ Cathode Materials

Boron and Phosphorus Dual-Doped Carbon Coating Improves Electrochemical Performances of LiFe_0.8Mn_0.2PO₄ Cathode Materials

“Less is More′′: Ultra Low LiPF₆ Concentrated Electrolyte for Efficient Li‐Ion Batteries