Approaching the limits of cationic and anionic electrochemical activity with the Li-rich layered rocksalt Li3IrO4

被引：152

作者：

Perez, Arnaud J. ^{[1
,2
,3
]}

Jacquet, Quentin ^{[1
,2
,3
]}

Batuk, Dmitry ^{[1
,4
]}

Iadecola, Antonella ^{[3
]}

Saubanere, Matthieu ^{[3
,5
]}

Rousse, Gwenaelle ^{[1
,2
,3
]}

Larcher, Dominique ^{[3
,6
]}

Vezin, Herve ^{[3
,7
]}

Doublet, Marie-Liesse ^{[3
,5
]}

Tarascon, Jean-Marie ^{[1
,2
,3
]}

机构：

[1] Coll France, Chim Solide & Energie, UMR 8260, 11 Pl Marcelin Berthelot, F-75005 Paris, France

[2] UPMC Univ Paris 06, Sorbonne Univ, 4 Pl Jussieu, F-75005 Paris, France

[3] Reseau Stockage Electrochim Energie RS2E, FR CNRS 3459, Amiens, France

[4] Univ Antwerp, EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

[5] Univ Montpellier, CNRS, Inst Charles Gerhardt, UMR 5253, Pl E Bataillon, F-34095 Montpellier, France

[6] UMR CNRS 7314, Lab Reactivite & Chim Solides, 33 Rue St Leu, F-80039 Amiens, France

[7] Univ Lille 1, CNRS, UMR 8516, LASIR, F-59655 Villeneuve Dascq, France

来源：

NATURE ENERGY | 2017年 / 2卷 / 12期

基金：

欧洲研究理事会;

关键词：

ELECTRODE MATERIALS; REDOX ACTIVITY; BATTERIES; CAPACITY; SYSTEM; STABILITY; CATHODES; IRIDIUM; OXIDES; XANES;

D O I：

10.1038/s41560-017-0042-7

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The Li-rich rocksalt oxides Li2MO3 (M = 3d/4d/5d transition metal) are promising positive-electrode materials for Li-ion batteries, displaying capacities exceeding 300 mAh g(-1) thanks to the participation of the oxygen non-bonding O(2p) orbitals in the redox process. Understanding the oxygen redox limitations and the role of the O/M ratio is therefore crucial for the rational design of materials with improved electrochemical performances. Here we push oxygen redox to its limits with the discovery of a Li3IrO4 compound (O/M = 4) that can reversibly take up and release 3.5 electrons per Ir and possesses the highest capacity ever reported for any positive insertion electrode. By quantitatively monitoring the oxidation process, we demonstrate the material's instability against O-2 release on removal of all Li. Our results show that the O/M parameter delineates the boundary between the material's maximum capacity and its stability, hence providing valuable insights for further development of high-capacity materials.

引用

页码：954 / 962

页数：9

共 32 条

[1] Structural and magnetic properties of Li3RuO4 [J].