Work

Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]

Year: 2003

Type: article

Abstract: The electrochemical performance of samples synthesized by sol-gel or solid-state routes varies considerably, although their physical characteristics are similar. Raman microprobe spectroscopic analysis indicated that the structure of the residual carbon present on the surfaces of the powders differs significantly and accounts for the performance variation. Higher utilization is associated with a larger ratio of -coordinated carbon, which exhibits better electronic properties than disordered or -coordinated carbonaceous materials. Incorporation of naphthalenetetracarboxylic dianhydride during synthesis results in a more graphitic carbon coating and improves utilization of in lithium cells, although the total carbon content is not necessarily higher than that of samples prepared without the additive. This result suggests that practical energy density need not be sacrificed for power density, provided that carbon coatings are optimized by carefully choosing additives. © 2003 The Electrochemical Society. All rights reserved.

Source: Electrochemical and Solid-State Letters

DOI: 10.1149/1.1601372

Authors: Marca M. Doeff, Yaoqin Hu, Frank McLarnon, Robert Kostecki

Institutions: Lawrence Berkeley National Laboratory, University of California, Berkeley

Language: English

Topic: Advancements in Battery Materials

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze

Funders: U.S. Department of Energy, Lawrence Berkeley National Laboratory