Na+-Activation Engineering in the Na3V2(PO4)3Cathode with Boosting Kinetics for Fast-Charging Na-Ion Batteries

Xing Shen; Yuefeng Su; Ni Yang; Xiaoping Jiang; Xingxing Liu; Junlin Mo; Yan Ran; Feng Wu

doi:10.1021/acsami.2c12685

Na⁺-Activation Engineering in the Na₃V₂(PO₄)₃Cathode with Boosting Kinetics for Fast-Charging Na-Ion Batteries

Xing Shen, Yuefeng Su^*, Ni Yang, Xiaoping Jiang, Xingxing Liu, Junlin Mo, Yan Ran, Feng Wu^*

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

Na superionic conductor-structured phosphates have attracted wide interest due to their high working voltage and fast Na⁺migration facilitated by the robust 3D open framework. However, they usually suffer from low-rate capability and inferior cycling stability due to the low intrinsic electronic conductivity and limited activated Na⁺ions. Herein, a doping protocol with Na⁺in the V³⁺site is developed to activate extra electrochemical Na⁺ions and expand the migration path of Na⁺, leading to the improvement of the electronic conductivity and diffusion kinetics. It is also disclosed that the generated stronger Na-O bonds with high ionicity significantly conduce to the enhanced structural stability in the Na⁺-substituted Na_3.05V_1.975Na_0.025(PO₄)₃/C cathode. The obtained composite can deliver an excellent rate capacity of 83.8 mA h g^-1at 20 C and a moderate cycling persistence of 91.3% over 1500 cycles at 10 C with great fast-charging properties. The reversible structure evolution is confirmed by the ex situ XRD, XPS, and ICP characterization. This work sheds light on awakening electroactive Na⁺ions and designing phosphates with superior electrochemical stability for practical Na-ion batteries.

Original language	English
Pages (from-to)	47685-47695
Number of pages	11
Journal	ACS applied materials & interfaces
Volume	14
Issue number	42
DOIs	https://doi.org/10.1021/acsami.2c12685
Publication status	Published - 26 Oct 2022

Keywords

NASICON cathode
Na-activation engineering
Na-ion batteries
NaV(PO)
fast-charging performance
structural regulation

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10.1021/acsami.2c12685

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title = "Na+-Activation Engineering in the Na3V2(PO4)3Cathode with Boosting Kinetics for Fast-Charging Na-Ion Batteries",

abstract = "Na superionic conductor-structured phosphates have attracted wide interest due to their high working voltage and fast Na+migration facilitated by the robust 3D open framework. However, they usually suffer from low-rate capability and inferior cycling stability due to the low intrinsic electronic conductivity and limited activated Na+ions. Herein, a doping protocol with Na+in the V3+site is developed to activate extra electrochemical Na+ions and expand the migration path of Na+, leading to the improvement of the electronic conductivity and diffusion kinetics. It is also disclosed that the generated stronger Na-O bonds with high ionicity significantly conduce to the enhanced structural stability in the Na+-substituted Na3.05V1.975Na0.025(PO4)3/C cathode. The obtained composite can deliver an excellent rate capacity of 83.8 mA h g-1at 20 C and a moderate cycling persistence of 91.3% over 1500 cycles at 10 C with great fast-charging properties. The reversible structure evolution is confirmed by the ex situ XRD, XPS, and ICP characterization. This work sheds light on awakening electroactive Na+ions and designing phosphates with superior electrochemical stability for practical Na-ion batteries.",

keywords = "NASICON cathode, Na-activation engineering, Na-ion batteries, NaV(PO), fast-charging performance, structural regulation",

author = "Xing Shen and Yuefeng Su and Ni Yang and Xiaoping Jiang and Xingxing Liu and Junlin Mo and Yan Ran and Feng Wu",

year = "2022",

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language = "English",

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T1 - Na+-Activation Engineering in the Na3V2(PO4)3Cathode with Boosting Kinetics for Fast-Charging Na-Ion Batteries

AU - Shen, Xing

AU - Su, Yuefeng

AU - Yang, Ni

AU - Jiang, Xiaoping

AU - Liu, Xingxing

AU - Mo, Junlin

AU - Ran, Yan

AU - Wu, Feng

PY - 2022/10/26

Y1 - 2022/10/26

N2 - Na superionic conductor-structured phosphates have attracted wide interest due to their high working voltage and fast Na+migration facilitated by the robust 3D open framework. However, they usually suffer from low-rate capability and inferior cycling stability due to the low intrinsic electronic conductivity and limited activated Na+ions. Herein, a doping protocol with Na+in the V3+site is developed to activate extra electrochemical Na+ions and expand the migration path of Na+, leading to the improvement of the electronic conductivity and diffusion kinetics. It is also disclosed that the generated stronger Na-O bonds with high ionicity significantly conduce to the enhanced structural stability in the Na+-substituted Na3.05V1.975Na0.025(PO4)3/C cathode. The obtained composite can deliver an excellent rate capacity of 83.8 mA h g-1at 20 C and a moderate cycling persistence of 91.3% over 1500 cycles at 10 C with great fast-charging properties. The reversible structure evolution is confirmed by the ex situ XRD, XPS, and ICP characterization. This work sheds light on awakening electroactive Na+ions and designing phosphates with superior electrochemical stability for practical Na-ion batteries.

AB - Na superionic conductor-structured phosphates have attracted wide interest due to their high working voltage and fast Na+migration facilitated by the robust 3D open framework. However, they usually suffer from low-rate capability and inferior cycling stability due to the low intrinsic electronic conductivity and limited activated Na+ions. Herein, a doping protocol with Na+in the V3+site is developed to activate extra electrochemical Na+ions and expand the migration path of Na+, leading to the improvement of the electronic conductivity and diffusion kinetics. It is also disclosed that the generated stronger Na-O bonds with high ionicity significantly conduce to the enhanced structural stability in the Na+-substituted Na3.05V1.975Na0.025(PO4)3/C cathode. The obtained composite can deliver an excellent rate capacity of 83.8 mA h g-1at 20 C and a moderate cycling persistence of 91.3% over 1500 cycles at 10 C with great fast-charging properties. The reversible structure evolution is confirmed by the ex situ XRD, XPS, and ICP characterization. This work sheds light on awakening electroactive Na+ions and designing phosphates with superior electrochemical stability for practical Na-ion batteries.

KW - NASICON cathode

KW - Na-activation engineering

KW - Na-ion batteries

KW - NaV(PO)

KW - fast-charging performance

KW - structural regulation

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Na⁺-Activation Engineering in the Na₃V₂(PO₄)₃Cathode with Boosting Kinetics for Fast-Charging Na-Ion Batteries

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