Energy Storage Science and Technology

   

Exploring the role of High Temperature Quenching in Structure and Performance of Mn-based layered cathode materials for sodium ion batteries

Shirong TAN1(), Wenji YIN2, Cuihong ZENG2, Xiaoqiong Li2, Shuo YIN1, Fangli JI1, Sijiang HU2(), Hongqiang WANG2, Qingyu LI2   

  1. 1.Hunan CNGR New Energy Science&Technology Co. , Ltd. , Changsha 410699, China
    2.Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, Guangxi, China
  • Received:2024-01-29 Revised:2024-04-07
  • Contact: Sijiang HU E-mail:tanshirong@cngrgf.com.cn;sjhu@gxnu.edu.cn

Abstract:

As a typical class of cathode materials for sodium ion batteries, Mn-based layered cathodes have the advantages of high theoretical specific capacity, low cost and high thermal stability. However, these cathode materials have been shown to undergo structure distortion, Na+/vacancies ordering, and transition metal vacancy, leading to poor cyclic stability. Previous studies reported that suppressing transition metal vacancy can effectively improve the electrochemical performance of Mn-based layered cathodes. In this work, we investigated the role of high temperature liquid N2 quenching in the structure and performance of Na0.67Fe1/3Co1/3Mn1/3O2 (NFCMO) and Na0.67Fe1/3Co1/3Mn1/3O2-Liquid N2 (NFCMO-LN) cathode materials during sol-gel process. Compared with pristine NFCMO, the NFCMO-LN shows higher specific capacity and rate capability. The NFCMO and NFCMO-LN electrodes deliver 91.1 and 129.8 mAh g-1 discharge capacity at 0.1 C in the initial cycle. Moreover, the capacity retention of NFCMO and NFCMO-LN are 100% and 90% after 100 cycles at 1C, respectively. In particular, NFCMO-LN can deliver a discharge capacity of 56.2 mAh g-1 even at 10.0 C. The structural analysis demonstrates that liquid nitrogen quenching at high temperature can effectively suppress transition metal vacancy and increase structural stability. Our findings provide feasible strategies in structure design and electrochemical performance optimization of cathode materials for sodium ion batteries.

Key words: sodium ion battery, layered oxide, sodium manganate, lattice doping, quenching

CLC Number: