Na4-M2+/2(P2O7)2 (2/3 7/8, M = Fe, Fe0.5Mn0.5, Mn): A Promising Sodium Ion Cathode for Na-ion Batteries

被引：162

作者：

Ha, Kwang-Ho ^{[1
,2
]}

Woo, Seung Hee ^{[1
,2
]}

Mok, Duckgyun ^{[1
,2
]}

Choi, Nam-Soon ^{[1
,2
]}

Park, Yuwon ^{[4
]}

Oh, Seung M. ^{[4
]}

Kim, Youngshol ^{[5
]}

Kim, Jeongsoo ^{[5
]}

Lee, Junesoo ^{[5
]}

Nazar, Linda F. ^{[3
]}

Lee, Kyu Tae ^{[1
,2
]}

机构：

[1] UNIST, Interdisciplinary Sch Green Energy, Ulsan 689798, South Korea

[2] UNIST, KIER UNIST Adv Ctr Energy, Ulsan 689798, South Korea

[3] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[4] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 151744, South Korea

[5] SK Innovat Co, Taejon 305712, South Korea

来源：

ADVANCED ENERGY MATERIALS | 2013年 / 3卷 / 06期

基金：

加拿大自然科学与工程研究理事会; 新加坡国家研究基金会;

关键词：

cathode; Na ion batteries; off-stoichiometry; pyrophosphate; solid solution; ELECTROCHEMICAL INSERTION; RECHARGEABLE BATTERIES; IRON PYROPHOSPHATE; LITHIUM; ELECTRODE; FLUOROPHOSPHATE; CARBON; SYSTEMS; PHASES; LICOO2;

D O I：

10.1002/aenm.201200825

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new polyanion-based compound, Na3.12M2.44(P2O7)2 (M = Fe, Fe0.5Mn0.5, Mn) is synthesized and examined as a cathode for Na ion batteries. Off-stoichiometric synthesis induces the formation of a Na-rich phase, Na3.32Fe2.34(P2O7)2 - a member of the solid solution series Na4-Fe2+/2(P2O7)2 (2/3 7/8) - which delivers a reversible capacity of about 85 mA h g-1 at ca. 3 V vs. Na/Na+ and exhibits very stable cycle performance. Above all, it shows fast kinetics for Na ions, delivering an almost constant 72% reversible capacity at rates between C/10 and 10C without the necessity for nanosizing or carbon coating. We attribute this to the spacious channel size along the a-axis, along with a single phase transformation upon de/sodiation.

引用

页码：770 / 776

页数：7

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