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首页> 外文期刊>Advanced energy materials >Synergistic Structural Engineering of Tunnel-Type Polyantimonic Acid Enables Dual-Boosted Volumetric and Areal Lithium Energy Storage
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Synergistic Structural Engineering of Tunnel-Type Polyantimonic Acid Enables Dual-Boosted Volumetric and Areal Lithium Energy Storage

机译：Synergistic Structural Engineering of Tunnel-Type Polyantimonic Acid Enables Dual-Boosted Volumetric and Areal Lithium Energy Storage

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摘要

Tunnel-structured polyantimonic acid (PAA) is an intriguing high-capacityanode candidate for alkali-metal-ion storage; however, the awful electroconductivityof PAA (≈10~(-10) S cm~(-1)) normally requires coupling with largesurface-area conductive substrate (e.g., graphene), conversely leading to poorscalability, ultralow density, and execrable volumetric energy. Synergistic structuralengineering of PAA via bulk-phase ion substitution and incorporationwith low-cost flake graphite (FG) is presented here to construct compositeelectrodes for lithium-storage. The full-occupation of Mn~(2+) into the tunnelcentersof PAA synchronously improves its bulk conductivity (≈10~(-5) S cm~(-1))and true density (4.58 g cm~(-3)), whilst less than 20% volume expansion of PAAis consequently achieved by FG confinement with enhanced multielectronreactionkinetics, unveiled by ex/in situ techniques. Besides delivering considerablevolumetric capacity (>1200 mAh cm~(-3) at 0.1 A g~(-1)), thus-fabricatedhigh-tap-density composite favors the construction of conducting additivefree,high-loading thick electrodes (>6.0 mg cm~(-2)), exhibiting dual-boostedareal/volumetric capacities (4.2 mAh cm~(-2)/743 mAh cm~(-3)), and fast-chargingcapability (75% capacity charged within ≈13 min). Moreover, 3D-printedcomposite electrodes with tunable shape and mass-loading are also implementedto showcase impressive areal/volumetric Li~+-storage performance.Paring with high-loading and high-compact-density LiCoO_2 cathodes (e.g.,18.0 mg cm~(-2)/3.53 g cc~(-1)), full-cells achieve remarkable electrode-level areal-/volumetric-energy-densities beyond 7.0 mWh cm~(-2)/850 Wh L_(cathode+anode)~(-1).

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