首页|超分子聚合物衍生的新型Nb(PO4)O的制备及其在钠离子电池中的应用

超分子聚合物衍生的新型Nb(PO4)O的制备及其在钠离子电池中的应用

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由于资源有限和成本较高,锂电池的大规模应用受到影响.相比之下,钠资源储量丰富,作为锂的替代品逐渐得到重视.然而,由于钠离子较大的半径,在电极嵌入/脱出过程中会使材料发生较大的体积变化,导致结构坍塌.要实现钠电的高性能应用,必须研发具有长循环寿命和优良倍率性能的负极材料.通过植酸三聚氰胺超分子聚合物辅助,运用一步煅烧法合成了一种新型的聚阴离子化合物氧化磷酸铌Nb(PO4)O.该材料具备稳定的大框架结构,保证了钠离子的快速传输;表面疏松的片状结构有利于电解液和电极之间进行传质,有效缩短扩散路径.当用作钠电负极组装钠离子电池时,在1 000 mA·g-1的电流密度下,3 000次循环以后可逆放电比容量达到133.7 mA.h·g-1;在4 000 mA· g-1的高电流密度下,可逆比容量仍有117.9 mA·h·g-1,与Nb2O5相比,具有明显的倍率性能和超长的循环稳定性.
Preparation of new Nb(PO4)O derived from supramolecular polymer and its application in sodium ion batteries
Due to the limited distribution of lithium resources,the high cost disadvantage of lithium-ion bat-tery gradually affects its large-scale application.In contrast,sodium resources are abundant in the world,as a substitute for lithium gradually gained widespread attention.However,due to the large radius of sodium ions,the material will undergo a large volume change during electrode insertion/removal,resulting in structural col-lapse.Therefore,in order to realize the high performance application of sodium electricity,it is necessary to develop cathode materials with long cycle life and good magnification performance.A novel polyanionic com-pound,niobium phosphate oxide Nb(PO4)O,was synthesized by one-step calcination with phytate-melamine supramolecular polymer assisted strategy.First of all,the material has a stable large frame structure to ensure the rapid transmission of sodium ions.Secondly,the loose sheet structure of the surface is conducive to the mass transfer between the electrolyte and the electrode,effectively shortening the diffusion path.When used as a sodium anode,the group of sodium ion batteries,in 1 000 mA·g-1 current density,3 000 cycles after re-versible discharge capacity can reach 133.7 mA·h·g-1,in 4 000 mA·g-1 high current density,reversible specific capacity is still 117.9 mA·h·g-1.Compared with Nb2O5,it has obvious magnification performance and long cycle stability.

sodium ion batterynegative electrode materialspolyanion compoundniobium phosphate oxide

顾鑫、尚鑫超、王明清、刘涛、邢涛、李跃然、李忠涛

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中国石油大学(华东)化学化工学院/重质油国家重点实验室,山东青岛 266580

山东能源集团有限公司大型煤气化及煤基新材料国家工程研究中心,山东济南 250100

钠离子电池 负极材料 聚阴离子化合物 氧化磷酸铌

国家自然科学基金山东省自然科学基金山东省自然科学基金山东省"泰山学者"项目山东能源集团有限公司技术基金山东能源集团有限公司技术基金

22138013ZR2020JQ21ZR2021ZD24tsqn201909062YKZB2020-176YKKJ2019J08JG-R63

2024

10.16152/j.cnki.xdxbzr.2024-02-008

西北大学学报(自然科学版)
西北大学

西北大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.35
ISSN：1000-274X
年,卷(期)：2024.54(2)
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