P2型层状氧化物正极的人工界面层构筑及储钠性能

doi:10.19964/j.issn.1006-4990.2023-0240

Abstract

Abstract:

P2-type Na_2/3Ni_1/3Mn_2/3O₂（P2-NNMO） has high working voltage，good safety，and low cost，making it a promising cathode material for sodium ion batteries.To solve the problem of sodium deficiency of P2-NNMO cathode and the interface between P2-NNMO cathode and electrolyte，an inorganic-rich artificial interface layer was constructed on P2-NNMO cathode via a chemical pre-sodiation method（spontaneous redox reaction between P2-NNMO cathode and sodium biphenyl），with which extra sodium ions insert the oxide cathode host structure.The results showed that the artificial interface layer formed by pre-sodiation contained NaF，shielded cathode material solvent corrosion and transition metal dissolution，and improved the diffusion kinetics of Na⁺.The modified cathode（P2-NNMO@CEI） delivered the discharge specific capacity of 95.1 mA∙h/g and the coulombic efficiency of 88.5% within the voltage of 2~4 V at the current density of 20 mA/g and possessed capacity retention of 84.2% after 280 cycles at the current density of 50 mA/g.This study provided an effective method for surface modification of layered oxide cathode and further provided a new concept and direction for designing interfaces of electrode materials toward real applications.

Key words: cathode electrolyte interface, cycling stability, layered oxides, sodium ion batteries

CLC Number:

TQ131.12

LIU Jie, SHI Xueru, WEI Shubing, CAO Xinxin. Artificial interface layer construction and sodium storage performance of P2-type layered oxide cathode[J]. Inorganic Chemicals Industry, 2024, 56(3): 39-44.

Figures/Tables 6

References 22

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Inorganic Acid-Base-Salt Committee of CIESC

Artificial interface layer construction and sodium storage performance of P2-type layered oxide cathode

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