摘要
为了研制出低成本、高性能的电池材料,选取价格低廉的Mn、Fe元素作为研究材料的主要组成元素,设计并合成了Na_(0.67)Mn_(0.67)Ni_(0.13)Fe_(0.13)O_(2)层状正极材料,研究了该材料的形貌、结构和电化学性能。X射线衍射测试结果表明Na_(0.67)Mn_(0.67)Ni_(0.13)Fe_(0.13)O_(2)材料具有纯的P2相结构。在2~4.3 V电压范围内进行恒电流充放电测试,0.5 C倍率下,材料的首周放电比容量为112.9 mAh·g^(-1),经过100周循环后,放电比容量为79.1 mAh·g^(-1),容量保持率为69.97%;在10 C高倍率下,首周放电比容量为80.42 mAh·g^(-1),1000周循环后放电比容量达到42.11 mAh·g^(-1),容量保持率为51.72%。材料展现出优秀的高倍率性能。
In order to develop battery material with low cost and high performance,cheap Mn and Fe elements were selected as the main component of Na_(0.67)Mn_(0.67)Ni_(0.13)Fe_(0.13)O_(2) layered cathode material.The morphology,structure and electrochemical properties of the Na_(0.67)Mn_(0.67)Ni_(0.13)Fe_(0.13)O_(2) were studied.The result of X-ray diffraction test shows that the Na_(0.67)Mn_(0.67)Ni_(0.13)Fe_(0.13)O_(2) material possesses pure P2 phase.When tested as cathode material in sodium-ion batteries within2~4.3 V,the initial discharge capacity of Na_(0.67)Mn_(0.67)Ni_(0.13)Fe_(0.13)O_(2 )was 112.9 mAh·g^(-1 )at rate of 0.5 C.After 100 cycles,the discharge capacity was 79.1 mAh·g^(-1) and the capacity retention is 69.9%.At high rate of 10 C,the discharge capacity in the first cycle is 80.4 mAh·g^(-1).After 1000 cycles,the discharge capacity is 42.1mAh·g^(-1) and the capacity retention is 51.7%.The prepared Na_(0.67)Mn_(0.67)Ni_(0.13)Fe_(0.13)O_(2) exhibits long cycling performance.
作者
付芳
Fu Fang(College of Materials Science and Engineering,Huaqiao University,Xiamen 361021,China)
出处
《广东化工》
CAS
2022年第12期1-4,共4页
Guangdong Chemical Industry
基金
福建省自然科学基金项目-青年创新(2019J05091)。
