O3型Na2/3Ni1/3Ti2/3O2层状氧化物作为一种稳定的高速率储钠负极材料,ACS Applied Materials & Interfaces

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O3型Na2/3Ni1/3Ti2/3O2层状氧化物作为一种稳定的高速率储钠负极材料
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-12-23 , DOI: 10.1021/acsami.1c17554
Si-Yuan Zhang _{1,

2} , Ya-Nan Zhou _{1,

2} , Lianzheng Yu ₁ , Min Fan ₂ , Wan-Ping Chen ₂ , Sen Xin ₂ , Ya-Xia Yin ₂ , Sailong Xu ₁ , Yu-Guo Guo ₂

Affiliation

钠离子电池（SIBs）由于其低成本和丰富的资源，是目前最有希望用于大规模储能设备的候选者。^{钛基层状氧化物因其具有约 0.7 V (vs Na +} /Na) 的安全电位和循环过程中的小体积收缩而作为有前途的负极材料引起了广泛关注；P2 型 Ti 基层状氧化物通常被报道，这是由于高百分比的不稳定 Ti ³⁺导致 O3 型对应物的合成具有挑战性。在此，我们报告了一个异常的 O3–Na _2/3 Ni _1/3 Ti _2/3 O ₂层状氧化物作为 SIB 的超稳定和高倍率负极材料。负极材料在 0.1 C 下循环 300 次后可提供 112 mA hg ^{–1的可逆容量，在}² C 下循环 1400 次后容量保持率为 91%，特别是即使在20 C (1780 mA g ^–1 )的高速率。此外，原位X 射线衍射监测显示没有相变和几乎为零的应变都是良好的长周期稳定性的基础。测得的高表观 Na ⁺扩散系数 (2.06 × 10 ^–10 cm ² s ^–1）和来自密度泛函理论计算的低迁移能垒（0.59 eV）是优异倍率能力的原因。我们的研究结果保证了先进的高性能 O3 型 Ti 基层状氧化物作为 SIB 应用的有前景的负极材料。

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O3-Type Na2/3Ni1/3Ti2/3O2 Layered Oxide as a Stable and High-Rate Anode Material for Sodium Storage

Sodium-ion batteries (SIBs) are currently the most promising candidates for large-scale energy storage devices owing to their low cost and abundant resources. Titanium-based layered oxides have attracted widespread attention as promising anode materials due to delivering a safe potential of about 0.7 V (vs Na⁺/Na) and a small volume contraction during cycles; P2-type Ti-based layered oxides are typically reported, due to the challenging synthesis of the O3-type counterpart resulting from the high percentage of unstable Ti³⁺. Herein, we report an anomalous O3–Na_2/3Ni_1/3Ti_2/3O₂ layered oxide as an ultrastable and high-rate anode material for SIBs. The anode material delivers a reversible capacity of 112 mA h g^–1 after 300 cycles at 0.1 C, a good capacity retention rate of 91% after 1400 cycles at 2 C, and, in particular, a capacity of 52 mA h g^–1 even at a high rate of 20 C (1780 mA g^–1). Furthermore, the in situ X-ray diffraction monitoring reveals no phase transitions and almost zero strain both underlie the good long-cycle stability. The measured high apparent Na⁺ diffusion coefficient (2.06 × 10^–10 cm² s^–1) and the low migration energy barrier (0.59 eV) from density functional theory calculations are responsible for the superior rate capability. Our results promise advanced high-performance O3-type Ti-based layered oxides as promising anode materials toward application for SIBs.

更新日期：2022-01-12

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