普鲁士蓝正极材料的离子交换法制备及电化学储钾性能 |
Prussian Blue Cathode Material: Preparation by Ion-Exchange Method and Electrochemical Potassium-Storage Performance |
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摘要: 采用氯化钾(KCl)和钠基普鲁士蓝(NPB)材料Na2-xMn[Fe(CN)6]z·yH2O为原料,通过离子交换法制备了掺钠钾基普鲁士蓝(NKPB)材料K1.9Na0.1Mn[Fe(CN)6]·0.4H2O。电化学测试表明,与用传统共沉淀法制备的钾基普鲁士蓝(KPB)材料K1.85Mn[Fe(CN)6]0.98□0.02·0.7H2O(□代表[Fe(CN)6]空位)相比,采用离子交换法制备的NKPB具有更高的容量(0.1C首次放电容量达136.3 mAh·g-1)、较好的循环稳定性(0.5C经过100次循环,容量保持率为96.1%)和优异的倍率性能(5C和10C容量分别为87.6和68.4 mAh·g-1)。NKPB优异的电化学性能与其高的钾含量、完整的晶体结构、钠离子掺杂、纳米级的颗粒尺寸,以及独特的开放框架结构有关。 |
关键词: 钾离子电池 正极材料 普鲁士蓝材料 离子交换法 电化学性能 |
基金项目: 国家自然科学基金(No.51572238)和浙江省自然科学基金(No.LY19E020013)资助 |
Abstract: Na-doped K-based Prussian blue (NKPB) material (K1.9Na0.1Mn[Fe(CN)6]·0.4H2O) was prepared by ion-exchange method using KCl and Na-based Prussian blue (NPB) material(Na2-xMn[Fe(CN)6]z·yH2O) as the precursors. The electrochemical tests reveal that compared with the K-based Prussian blue (KPB) material K1.85Mn[Fe(CN)6]0.98□0.02·0.7H2O (□ is the[Fe(CN)6] vacancy) prepared by a conversional coprecipitation route, the NKPB prepared by ion-exchange method shows higher capacity (the initial discharge capacity at 0.1C reached 136.3 mAh·g-1), longer cycle life (the capacity retention after 100 cycles at 0.5C was 96.1%), and better rate capability (the capacities at 5C and 10C were 87.6 and 68.4 mAh·g-1, respectively). The outstanding electrochemical performance of the NKPB material is ascribed to its high K content, good crystal integrity, Na-ion doping, nanosized particles and the unique open framework structure. |
Keywords: potassium-ion battery cathode material Prussian blue material ion-exchange method electrochemical performance |
投稿时间:2019-07-04 修订日期:2019-11-11 |
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孙云坡,谢健,赵新兵,庄大高,张根林.普鲁士蓝正极材料的离子交换法制备及电化学储钾性能[J].无机化学学报,2020,36(1):106-112. |
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