铁基普鲁士蓝正极材料的宏量制备及电化学储钠性能  

Scalable Preparation and Electrochemical Sodium‑Storage Performance of Fe‑Based Prussian Blue Cathode Material

作　　者：孙瑜 孙云坡 刘春丽 谢健[1] 赵新兵[1] 裘吕超 梅简 徐雄文 涂健 SUN Yu;SUN Yun‑Po;LIU Chun‑Li;XIE Jian;ZHAO Xin‑Bing;QIU Lü‑Chao;MEI Jian;XU Xiong‑Wen;TU Jian(School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;LI-FUN Technology Corporation Limited,Zhuzhou,Hunan 412000,China)

机构地区：[1]浙江大学材料科学与工程学院,杭州310027 [2]国网浙江省电力有限公司电力科学研究院,杭州310014 [3]湖南立方新能源科技有限责任公司,株洲412000

出　　处：《无机化学学报》2021年第6期1037-1045,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家电网浙江省电力有限公司重点科技项目(No.5211DS18003G);湖南省重大科技项目(No.2020GK1014)资助。

摘　　要：以柠檬酸钠作为配位剂,采用共沉淀法,在室温下制备了铁基普鲁士蓝材料(FePB)。当使用20 L容积的反应釜,并将前驱体亚铁氰化钠(Na_(4)[Fe(CN)_(6)])的浓度提高至0.5 mol·L^(-1)时,制备一次可实现高达500 g的产量。电化学测试显示,所得FePB材料具有较高的容量、优异的倍率性能和良好的循环寿命。在0.1C时,该材料首次放电比容量可达到117 mAh·g^(-1),在10C的大电流密度下,比容量仍可保持在92 mAh·g^(-1)。在1C电流密度下,经过500次循环,比容量仍保持在87 mAh·g^(-1),容量保持率达到89%。以商业硬碳为负极,以FePB为正极,制作了软包钠离子全电池。该软包电池在50 mA的电流下,经过400次循环可实现75%的容量保持率。FePB材料优异的电化学性能与其较高的钠含量、低的缺陷、多边界的微观结构以及普鲁士蓝类材料独特的开放框架结构有关。Fe‑based Prussian blue material(FePB)was synthesized by coprecipitation method at room temperature using sodium citrate as chelating agent.A high yield of 500 g per preparation can be obtained by using a 20 L reactor and a Na_(4)Fe(CN)_(6) precursor with a concentration up to 0.5 mol·L^(-1).The results of electrochemical measurements indicate that the obtained FePB showed a high capacity,excellent rate capability and long cycle life.At 0.1C,the first discharge capacity of FePB reached 117 mAh·g^(-1).At a current density as high as 10C,the FePB can still yield a discharge capacity of 92 mAh·g^(-1).After 500 cycles at 1C,a specific capacity of 87 mAh·g^(-1) still maintained with a retention of 89%.Pouch‑type Na‑ion full battery was fabricated using commercial hard carbon as anode and FePB as cathode,which exhibited a capacity retention of 75%after 400 cycles at 50 mA.The excellent electrochemical performance of the FePB is attributed to its high sodium content,low defect,border‑rich microstructure and the unique open framework structure of the Prussian blue analogues.

关 键 词：钠离子电池 普鲁士蓝正极 共沉淀法 宏量制备 电化学 能量转换 

分 类 号：TB34[一般工业技术—材料科学与工程]