Size-dependent surface phase change of lithium iron phosphate during carbon coating.

Abstract:

:Carbon coating is a simple, effective and common technique for improving the conductivity of active materials in lithium ion batteries. However, carbon coating provides a strong reducing atmosphere and many factors remain unclear concerning the interface nature and underlying interaction mechanism that occurs between carbon and the active materials. Here, we present a size-dependent surface phase change occurring in lithium iron phosphate during the carbon coating process. Intriguingly, nanoscale particles exhibit an extremely high stability during the carbon coating process, whereas microscale particles display a direct visualization of surface phase changes occurring at the interface at elevated temperatures. Our findings provide a comprehensive understanding of the effect of particle size during carbon coating and the interface interaction that occurs on carbon-coated battery material--allowing for further improvement in materials synthesis and manufacturing processes for advanced battery materials.

journal_name

Nat Commun

journal_title

Nature communications

authors

Wang J,Yang J,Tang Y,Liu J,Zhang Y,Liang G,Gauthier M,Chen-Wiegart YC,Norouzi Banis M,Li X,Li R,Wang J,Sham TK,Sun X

doi

10.1038/ncomms4415

subject

Has Abstract

pub_date

2014-03-05 00:00:00

pages

3415

issn

2041-1723

pii

ncomms4415

journal_volume

5

pub_type

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