摘要
P2型层状正极材料Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)具有成本较低、工作电压较高等优点,是目前钠离子电池代替铅酸电池最有希望的正极材料,但其较差的循环保持率,制约了它的实际应用与发展。采用痕量ZnO包覆对P2型层状正极材料Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)(NNMO)进行痕量包覆改性。结果表明:在2.0~4.3V、2.0C的充放电条件下,NNMO和0.5 ZnO@NNMO的首圈放电比容量分别为84mAh/g、101mAh/g,100圈后NNMO保持率仅为68%,而经过ZnO改性的0.5 ZnO@NNMO保持率高达94%。与空白样品相比,0.5 ZnO@NNMO电化学性能更好,可逆性更强。这是因为即使是痕量的ZnO包覆亦能与基体材料协同作用提升材料的离子导电性。可见,痕量ZnO包覆对提升钠电池层状正极材料的实际应用性有很大作用。
P2-type layered cathode material Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)has the advantages of low cost and high working voltage.It is the most promising cathode material for sodium-ion batteries to replace lead-acid batteries at present,but its poor cycle retention rate restricts its practical application and development.Trace ZnO coating was used to modify P2-type layered cathode material Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)(NNMO).The results showed that the first-cycle discharge specific capacities of NNMO and 0.5 ZnO@NNMO were 84 and 101mAh·g^(-1),respectively,under the charge-discharge conditions of 2.0~4.3V and 2.0C.After 100 cycles,the retention rate of NNMO was only 68%,while the retention rate of 0.5 ZnO@NNMO modified by ZnO was as high as 94%.Compared with the blank sample,0.5 ZnO@NNMO had better electrochemical performance and stronger reversibility.This was because even trace ZnO coating could synergize with the matrix material to improve the ionic conductivity of the material.The finding indicated that trace ZnO coating played a great role in improving the practical application of layered cathode materials for sodium batteries.
作者
倪峻泽
尤樱樱
蔡盈盈
熊千卉
陈馨语
张汉平
Ni Junze;You Yingying;Cai Yingying;Xiong Qianhui;Chen Xinyu;Zhang Hanping(School of Petrochemical Engineering,Changzhou University,Changzhou 213164)
出处
《化工新型材料》
北大核心
2025年第2期96-99,105,共5页
New Chemical Materials
基金
国家自然科学基金(51273027)
2022年江苏省研究生科研与实践创新计划项目(KYCX22_3095)。
