Realizing Complete Solid-Solution Reaction in High Sodium Content P2-Type Cathode for High-Performance Sodium-Ion Batteries.,Angewandte Chemie International Edition

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Realizing Complete Solid-Solution Reaction in High Sodium Content P2-Type Cathode for High-Performance Sodium-Ion Batteries.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-06-05 , DOI: 10.1002/anie.202003972
Ting Jin _{1,

2} , Peng-Fei Wang ₂ , Qin-Chao Wang ₃ , Kunjie Zhu ₁ , Tao Deng ₂ , Jiaxun Zhang ₂ , Wei Zhang ₁ , Xiao-Qing Yang ₃ , Lifang Jiao ₁ , Chunsheng Wang ₂

Affiliation

P2‐type layered oxides suffer from an ordered Na⁺/vacancy arrangement and P2→O2/OP4 phase transitions, leading them to exhibit multiple voltage plateaus upon Na⁺ extraction/insertion. The deficient sodium in the P2‐type cathode easily induces the bad structural stability at deep desodiation states and limited reversible capacity during Na⁺ de/insertion. These drawbacks cause poor rate capability and fast capacity decay in most P2‐type layered oxides. To address these challenges, a novel high sodium content (0.85) and plateau‐free P2‐type cathode‐Na_0.85Li_0.12Ni_0.22Mn_0.66O₂ (P2‐NLNMO) was developed. The complete solid‐solution reaction over a wide voltage range ensures both fast Na⁺ mobility (10⁻¹¹ to 10⁻¹⁰ cm² s⁻¹) and small volume variation (1.7 %). The high sodium content P2‐NLNMO exhibits a higher reversible capacity of 123.4 mA h g⁻¹, superior rate capability of 79.3 mA h g⁻¹ at 20 C, and 85.4 % capacity retention after 500 cycles at 5 C. The sufficient Na and complete solid‐solution reaction are critical to realizing high‐performance P2‐type cathodes for sodium‐ion batteries.

中文翻译：

在高性能钠离子电池的高钠含量P2型阴极中实现完全固溶反应。

P2型层状氧化物具有有序的Na ⁺ /空位排列和P2→O2 / OP4相变，导致它们在Na ⁺提取/插入时表现出多个电压平稳状态。P2型阴极中钠的缺乏很容易在深脱氧状态下引起不良的结构稳定性，并且在Na ⁺脱除/插入过程中可逆容量有限。这些缺点导致大多数P2型层状氧化物的速率能力差和容量衰减快。为了应对这些挑战，提出了一种新颖的高钠含量（0.85）和无平台P2型阴极钠_0.85 Li _0.12 Ni _0.22 Mn _0.66 O ₂（P2-NLNMO）已开发。宽电压范围内的完整固溶反应可确保快速的Na ⁺迁移率（10 ^-11至10 ^-10 cm ² s ^-1）和较小的体积变化（1.7％）。高钠含量的P2-NLNMO表现出更高的可逆容量123.4 mA h g ^-1，在20 C下具有79.3 mA h g ^-1的超高倍率容量以及在5 C下500次循环后的容量保持率85.4％。足够的Na和完整的固体溶液反应对于实现钠离子电池的高性能P2型阴极至关重要。

更新日期：2020-08-10

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