Investigation of optical, electrical and dielectric properties of pyrophosphates LixCu2-x/2 P2O7 (x = 0.0; 0.05; 0.1)

Mortadi, Halima; Bouragba, Fatima Zahra; Assekouri, Abdelmonim; Alaoui-Belghiti, Hanan El; Sabbar, Elmouloudi; Bettach, Mohammed

doi:10.1016/j.jssc.2022.123609

Cited by 6 publications

(2 citation statements)

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“…In the infrared spectra of the samples calcined at 700, 800, and 900 °C, there is a characteristic peak of P 2 O 7 2– at 716 cm –1 , which shows the symmetrical vibration of bridging oxygen. The existence of this vibration can be considered as the decisive proof of the P–O–P bridge . At the same time, the peaks at 959 and 1094 cm –1 are the antisymmetric vibration of the P–O–P bridge and PO 3 asymmetric vibration, respectively. , The existence of three characteristic peaks of P 2 O 7 2– further explained that high purity Fe 2 P 2 O 7 was obtained after calcination.…”

Section: Results and Discussionmentioning

confidence: 86%

“…The existence of this vibration can be considered as the decisive proof of the P−O− P bridge. 35 At the same time, the peaks at 959 and 1094 cm −1 are the antisymmetric vibration of the P−O−P bridge and PO 3 asymmetric vibration, respectively. 36,37 The existence of three characteristic peaks of P 2 O 7 2− further explained that high purity Fe 2 P 2 O 7 was obtained after calcination.…”

Section: Optimization Of Leachingmentioning

confidence: 99%

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All-Component Recycling and Reuse Process for Spent LiFePO₄ Cathodes

Zeng,

Wang,

Cai

et al. 2024

Ind. Eng. Chem. Res.

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With the termination of the life of the first generation of power batteries, a substantial quantity of lithium iron phosphate (LiFePO 4 ) batteries necessitates recycling. The mainstream recycling process is lithium leaching with acid leaching systems and cathode material regeneration. However, the binder poly(vinylidene fluoride) (PVDF) and the conductive carbon in the cathode material are not utilized. In this paper, a new two-step recycling process is proposed: (1) an acid-free lithium leaching route using a single component K 2 S 2 O 8 as a leaching agent and (2) utilizing the residual carbon in the leaching residue to produce Fe 2 P 2 O 7 , which can be used as anodes for batteries, by high-temperature carbothermal reduction of FePO 4 . By optimizing the leaching process parameters, 98.9 wt % of the lithium in the cathode material can be selectively released. The electrochemical characteristics of Fe 2 P 2 O 7 synthesized at various carbothermal reduction temperatures were assessed, revealing that the sample produced at 700 °C exhibited the most favorable electrochemical attributes. Even after 750 cycles at a current density of 1.0 A/g, the catalyst retained a specific capacity of 160 mAh/g. This research introduces an innovative approach for the comprehensive recuperation of all components in recycling LiFePO 4 .

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Section: Results and Discussionmentioning

confidence: 86%