储能科学与技术2024，Vol.13Issue(7)：2399-2406,8.DOI:10.19799/j.cnki.2095-4239.2024.0084
高温淬火对钠离子电池锰基层状正极材料结构和性能的影响
Role of high temperature quenching in structure and performance of Mn-based layered cathode materials for sodium-ion batteries
摘要
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 Na0.67Fe1/3Co1/3Mn1/3 O2(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.关键词
钠离子电池/层状氧化物/锰酸钠/掺杂/淬火Key words
sodium ion battery/layered oxide/sodium manganate/lattice doping/quenching分类
化学化工引用本文复制引用
谭仕荣,尹文骥,曾翠鸿,黎小琼,訚硕,纪方力,胡思江,王红强,李庆余..高温淬火对钠离子电池锰基层状正极材料结构和性能的影响[J].储能科学与技术,2024,13(7):2399-2406,8.基金项目
广西自然科学基金粤桂联合基金项目(2021GXNSFDA075012). （2021GXNSFDA075012）
