Unveiling the Effects of Cr Single Atoms with Controllable Configurations on Solid Electrolyte Interphase and Storage Mechanism of Sodium Ions

Chong Wang; Bohan Li; Wanci ShenFeiyu KangZheng-Hong HuangRuitao Lv

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Unveiling the Effects of Cr Single Atoms with Controllable Configurations on Solid Electrolyte Interphase and Storage Mechanism of Sodium Ions

机译：Unveiling the Effects of Cr Single Atoms with Controllable Configurations on Solid Electrolyte Interphase and Storage Mechanism of Sodium Ions

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Single atomic metal (SAM) doping is reported as an effective strategy topromote the electrochemical property of carbon-based anode materials forhigh-power sodium-ion batteries (SIBs). However, the effects of SAM withdifferent configurations on solid electrolyte interphase (SEI) and energystorage mechanism of Na~+ are not revealed. Herein, Cr single atoms (CrSAs)are reported with controllable configurations (Cr–N_4 or Cr–N_2) implantedon the N, P co-doped carbon (NPC) anode materials (denoted as CrN4SAs/NPC or CrN_2SAs/NPC). The CrN_4SAs/NPC anode displays a high specificcapacity (318.2 mAh g~(?1) at 0.05 A g~(?1)) and outstanding rate performance(145.1 mAh g~(?1) at 5 A g~(?1)), better than those of CrN_2SAs/NPC and NPC. Thesuperiority is originated from the difference of SEI and the energy storagemechanism of sodium ions during electrochemical process, which areunveiled through ex situ characterization and theoretical calculation. The fullcell assembled with CrN4SAs/NPC anode and Na_3V_2(PO_4)_2F_3@C cathodedisplays a high energy density at a high power density.

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来源
《Advanced functional materials》 |2023年第18期|2214429.1-2214429.8|共8页
作者
Chong Wang; Bohan Li; Wanci ShenFeiyu KangZheng-Hong HuangRuitao Lv;
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作者单位

State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084, China;

State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084, China,Engineering Laboratory for Functionalized Carbon MaterialsShenzhen Key Laboratory for Graphene-based MaterialsGradu;

State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084, China,Key Laboratory of Advanced Materials (MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing 100;

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Cr single atoms; high-power sodium-ion batteries; N/P co-doping; solid electrolyte interphase; storage mechanisms;

Unveiling the Effects of Cr Single Atoms with Controllable Configurations on Solid Electrolyte Interphase and Storage Mechanism of Sodium Ions

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