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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‐Na0.85Li0.12Ni0.22Mn0.66O2 (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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