具有完全放电-充电功能的高度稳定的Li-O <sub>2</sub>电池：无粘结剂和无碳的多孔IrNi纳米片阴极,ACS Sustainable Chemistry & Engineering

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具有完全放电-充电功能的高度稳定的Li-O ₂电池：无粘结剂和无碳的多孔IrNi纳米片阴极
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-22 , DOI: 10.1021/acssuschemeng.0c02154
Zhengyi Qian ₁ , Xudong Li ₁ , Liguang Wang ₂ , Tianpin Wu ₂ , Baoyu Sun ₁ , Lei Du ₁ , Yulin Ma ₁ , Chunyu Du ₁ , Pengjian Zuo ₁ , Geping Yin ₁

Affiliation

鉴于其极高的理论能量密度，可充电非质子传递Li-O ₂电池备受关注。但是，氧阴极反应的动力学缓慢会导致巨大的能量损失，而与广泛使用的碳和粘合剂相关的不良副反应则导致电池在循环中快速衰减。在本文中，分层多孔的IrNi合金纳米片方便地设计在Ni泡沫基材上，作为独立的，无粘结剂和无碳的阴极，以解决这些挑战。IrNi纳米片由许多相互连接的纳米颗粒组成，形成大量的纳米孔，有利于活性位点暴露。此外，介孔/大孔为氧气和锂离子的转移铺平了通道，并为不溶的Li ₂ O提供了足够的容纳空间。₂产品。相应的Li–O ₂电池显示出低极化和出色的循环稳定性，具有完全的放电/充电能力（在2.3至4.3 V的电压范围内，电流密度为0.2 mA cm ^–2时，最多可循环292次）。长期循环性能主要归因于多孔IrNi纳米片的排他性催化稳定性及其与基于二甲亚砜的电解质的良好相容性。我们的研究为用于高能量密度Li–O ₂电池的坚固，独立式多孔阴极的设计提供了新颖的见解。

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Enabling Highly Stable Li–O2 Batteries with Full Discharge–Charge Capability: The Porous Binder- and Carbon-Free IrNi Nanosheet Cathode

Rechargeable aprotic Li–O₂ batteries have drawn much attention in light of their ultrahigh theoretical energy density. However, the sluggish kinetics of oxygen cathode reactions lead to huge energy loss, while the unfavorable side reactions associated with the widely used carbon and binder account for fast battery decay during cycles. Herein, hierarchically holey IrNi alloy nanosheets are facilely designed on Ni foam substrate as a freestanding, binder- and carbon-free cathode to address these challenges. The IrNi nanosheets consist of numerous interconnected nanoparticles, forming abundant nanoholes, benefiting active-site exposure. Moreover, the meso-/macropores pave channels for the transfer of oxygen and lithium ions and provide enough accommodation for the insoluble Li₂O₂ product. The corresponding Li–O₂ batteries demonstrate low polarization and excellent cycle stability with full discharge/charge capability (up to 292 cycles at a current density of 0.2 mA cm^–2 within a voltage range from 2.3 to 4.3 V). The long-term cycling performance is principally attributed to the exclusive catalytic stability of the holey IrNi nanosheets and its good compatibility with dimethyl sulfoxide-based electrolyte. Our research provides novel insights into the design of robust and freestanding porous cathodes for high energy density Li–O₂ batteries.

更新日期：2020-11-02

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