The discharge rate capability of rechargeable Li-O2 batteries

被引：369

作者：

Lu, Yi-Chun ^{[1
]}

Kwabi, David G. ^{[2
]}

Yao, Koffi P. C. ^{[2
]}

Harding, Jonathon R. ^{[3
]}

Zhou, Jigang ^{[4
]}

Zuin, Lucia ^{[4
]}

Shao-Horn, Yang ^{[1
,2
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[2] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

[3] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

[4] Univ Saskatchewan, Canadian Light Source Inc, Saskatoon, SK S7N 0X4, Canada

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2011年 / 4卷 / 08期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

LITHIUM BATTERIES; AIR BATTERIES; ELECTRODE; ELECTROCHEMISTRY; DIFFUSION; CATHODE; ION;

D O I：

10.1039/c1ee01500a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The O-2 electrode in Li-O-2 cells was shown to exhibit gravimetric energy densities (considering the total weight of oxygen electrode in the discharged state) four times that of LiCoO2 with comparable gravimetric power. The discharge rate capability of Au-catalyzed Vulcan carbon and pure Vulcan carbon (VC) as the O-2 electrode was studied in the range of 100 to 2000 mA g(carbon)(-1). The discharge voltage and capacity of the Li-O-2 cells were shown to decrease with increasing rates. Unlike propylene carbonate based electrolytes, the rate capability of Li-O-2 cells tested with 1,2-dimethoxyethane was found not to be limited by oxygen transport in the electrolyte. X-Ray diffraction (XRD) showed lithium peroxide as the discharge product and no evidence of Li2CO3 and LiOH was found. It is hypothesized that higher discharge voltages of cells with Au/C than VC at low rates could have originated from higher oxygen reduction activity of Au/C. At high rates, higher discharge voltages with Au/C than VC could be attributed to faster lithium transport in nonstoichiometric and defective lithium peroxide formed upon discharge, which is supported by XRD and X-ray absorption near edge structure O and Li K edge data.

引用

页码：2999 / 3007

页数：9

共 36 条

[1] A polymer electrolyte-based rechargeable lithium/oxygen battery [J].