New advanced cathode material: LiMnPO4 encapsulated with LiFePO4

被引：58

作者：

Zaghib, K. ^{[1
]}

Trudeau, M. ^{[1
]}

Guerfi, A. ^{[1
]}

Trottier, J. ^{[1
]}

Mauger, A. ^{[2
]}

Veillette, R. ^{[1
]}

Julien, C. M. ^{[3
]}

机构：

[1] Hydro Quebec Res Inst, Varennes, PQ J3X 1S1, Canada

[2] Univ Paris 06, Inst Mineral & Phys Mat Condensee, F-75252 Paris 05, France

[3] Univ Paris 06, F-57252 Paris 05, France

来源：

JOURNAL OF POWER SOURCES | 2012年 / 204卷

关键词：

Lithium manganese phosphate; Cathode material; Encapsulation; Lithium-ion batteries; ELECTROCHEMICAL PERFORMANCE; ELECTRODE MATERIALS; PHOSPHO-OLIVINES; LITHIUM; TEMPERATURE;

D O I：

10.1016/j.jpowsour.2011.11.085

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：

Coating the members of the olivine family LiMPO4 with conductive carbon is difficult, excepted in the case M=Fe. To overcome this difficulty, we found possible to coat LiMnPO4 with a thin layer of LiFePO4 to take benefit of the catalytic reaction of Fe with C, so that a 3 nm-thick layer of carbon can be deposited at the surface of this composite. We find that the electrochemical properties of the carbon-coated LiFePO4-LiMnPO4 composite are improved with respect to the carbon-coated LiMn2/3Fe1/3PO4 solid solution with comparable Fe/Mn ratio. Therefore, the use of a LiFePO4 as a buffer layer between the high-density cathode element (like LiMnPO4) and the carbon layer opens a new route to improve the performance of the olivine family as the active element of the cathode for Li-ion batteries. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：177 / 181

页数：5

共 23 条

[1] Fine-particle lithium iron phosphate LiFePO4 synthesized by a new low-cost aqueous precipitation technique [J].