Reversible Activation of V~(4+)/V~(5+) Redox Couples in NASICON Phosphate Cathodes

Chunliu Xu; Junmei Zhao; Yi-Ao WangWeibo HuaQiang fuXinmiao LiangXiaohui RongQiangqiang ZhangXiaodong GuoChao YangHuizhou LiuBenhe ZhongYong-Sheng Hu

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Reversible Activation of V~(4+)/V~(5+) Redox Couples in NASICON Phosphate Cathodes

机译：Reversible Activation of V~(4+)/V~(5+) Redox Couples in NASICON Phosphate Cathodes

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Na superionic conductor structured Na_3V_2(PO_4)_3 cathodes have attractedgreat interest due to their long cycling lifespan and high thermal stabilityrendered by the robust 3D framework. However, their practical applicationis still hindered by the high cost of raw materials and limited energy density.Herein, a doping strategy with low-cost Fe~(2+) is developed to activateV~(4+)/V~(5+) redox, in an attempt to increase the energy density of phosphatecathodes. It is also revealed that reversible activation of V4+/V5+ redox isrelated to the Na positions (Na1, 6b; Na2, 18e). Only the V-based compoundswith enough Na2 content can activate the V~(4+)/V~(5+) reversibly. Moreimportantly, without presodiation treatment and addition of any sodiationagent, Na_(3.4)V_(1.6)Fe_(0.4)(PO_4)_3 is delicately designed as both cathode and the Naself-compensation agent in full cells, allowing a promising energy density of≈260 Wh kg~(?1). This work sheds light on enhancing the energy density, anddesigning Na self-compensation for practical Na-ions batteries.

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《Advanced energy materials》 |2022年第25期|2200966.1-2200966.12|共12页
作者
Chunliu Xu; Junmei Zhao; Yi-Ao WangWeibo HuaQiang fuXinmiao LiangXiaohui RongQiangqiang ZhangXiaodong GuoChao YangHuizhou LiuBenhe ZhongYong-Sheng Hu;
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CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190, China,School of Chemical EngineeringSichuan UniversityChengdu 610065, P. R. China;

CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190, China,Innovation Academy for Green ManufactureChinese Academy of SciencesBeijing 1;

CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190, ChinaSchool of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an, Shaanxi 710049, China,Institute of Applied Materials (IAM)Karlsruhe Institute of Technology (KIT)Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein Leopoldshafen,GermanyInstitute of Applied Materials (IAM)Karlsruhe Institute of Technology (KIT)Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein Leopoldshafen,GermanyState Key Laboratory of Magnetic Resonance and Atomicand Molecular PhysicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071, ChinaKey Laboratory for Renewable EnergyBeijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190, ChinaSchool of Chemical EngineeringSichuan UniversityChengdu 610065, P. R. China;

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正文语种英语
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activation of V~（4+）/V~（5+）; Na self-compensation; Na_3V_2(PO_4)_3; Na-ion batteries;

Reversible Activation of V~(4+)/V~(5+) Redox Couples in NASICON Phosphate Cathodes

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