Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (7): 2399-2406.doi: 10.19799/j.cnki.2095-4239.2024.0084

• Energy Storage Materials and Devices • Previous Articles     Next Articles

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 QI1, Fangli JI1, Sijiang HU2(), Hongqiang WANG2, Qingyu LI2   

  1. 1.Hunan Zhongwei New Energy Technology Co. , Ltd. , Changsha 410699, Hunan, China
    2.Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmacy, Guangxi Normal University, Guilin 541004, Guangxi, China
  • Received:2024-01-29 Revised:2024-04-07 Online:2024-07-28 Published:2024-07-23
  • Contact: Sijiang HU E-mail:tanshirong@cngrgf.com.cn;sjhu@gxnu.edu.cn

Abstract:

Mn-based layered cathodes are a prominent class of cathode materials for sodium-ion batteries, characterized by high theoretical specific capacity, low cost, and high thermal stability. However, these materials are prone to structural distortions, Na+/vacancy ordering, and the formation of transition metal vacancies, which detrimentally affect cyclic stability. Previous research indicates that mitigating transition metal vacancies can effectively enhance the electrochemical performance of these cathodes. This study investigates the impact of high-temperature liquid nitrogen quenching on the structure and performance of Na0.67Fe1/3Co1/3Mn1/3O2 (NFCMO) and its quenched counterpart—NFCMO-LN—during the sol-gel process. NFCMO-LN exhibits improved specific capacity and rate capability compared with pristine NFCMO. Specifically, NFCMO and NFCMO-LN demonstrate initial cycle discharge capacities of 91.1 mAh/g and 129.8 mAh/g at 0.1C, respectively. Furthermore, after 100 cycles at 1C, NFCMO retains 100% of its capacity, whereas NFCMO-LN maintains 90%. Remarkably, NFCMO-LN achieves a discharge capacity of 56.2 mAh/g at a high rate of 10C. Structural analyses reveal that liquid nitrogen quenching effectively reduces transition metal vacancies and enhances structural stability, offering viable strategies for the design and optimization of cathode materials in sodium-ion batteries.

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

CLC Number: