An Undoped Tri-Phase Coexistent Cathode Material for Sodium-Ion Batteries

Ranran Li; Jian Gao; Junpeng LiHao HuangXiaolei LiWenlong WangLi-Rong ZhengShu-Meng HaoJieshan QiuWeidong Zhou

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An Undoped Tri-Phase Coexistent Cathode Material for Sodium-Ion Batteries

机译：An Undoped Tri-Phase Coexistent Cathode Material for Sodium-Ion Batteries

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The layered transition-metal-oxide materials are one type of promising cathodematerials for sodium-ion batteries, which typically include P2, P3, and O3phases, and each has its own advantages and challenges. Taking into accountthe complementarity of each single-phase structure, constructing the compositestructures is an efficient pathway to stabilize the structure and improvethe electrochemical performance. Herein, three composite cathode materialsowning the phase structures of P3/P2, P2/O3, and P3/P2/O3 are prepared bychanging the calcinating conditions without introducing any doping element.Among them, the composite of P3/P2/O3 shows the best capacity retention of80 mAh g~(–1) after 200 cycles and the highest rate performance of 100 mAh g~(–1) ata current density of 750 mA g~(–1). The improved electrochemical performance canbe attributed to the staggered arrangement of different phase structures andthe gradient Na-extraction/intercalation voltages of different phases. The slipof the transition metal layer is subjected to the constraint of the adjacent phasestructure, thus inhibiting the phase transformation for capacity fading. Thiswork provides an easy way for the preparation of composite cathode structuresand brings a clear case for understanding the advantage of composite structureson electrochemical performance.

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来源
《Advanced functional materials》 |2022年第41期|2205661.1-2205661.11|共11页
作者
Ranran Li; Jian Gao; Junpeng LiHao HuangXiaolei LiWenlong WangLi-Rong ZhengShu-Meng HaoJieshan QiuWeidong Zhou;
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作者单位

Beijing Advanced Innovation Center for Soft Matter Science andEngineeringState Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029, P.R. China;

State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029, P.R. China;

Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049, P.R. China;

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正文语种英语
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composite cathodes; layered metal-oxides; Na-ion batteries; P3/P2/O3; tri-phase structures;

An Undoped Tri-Phase Coexistent Cathode Material for Sodium-Ion Batteries

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