Open AccessThe Critical Role of Carbon in the Chemical Delithiation Kinetics of LiFePO4
Author(s) -
Montserrat Galcerán,
Abdelbast Guerfi,
Michel Armand,
Karim Zaghib,
Montse CasasCabañas
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab7ce3
Subject(s) - oxidizing agent , carbon fibers , lithium (medication) , materials science , chemical engineering , lithium iron phosphate , inorganic chemistry , electrochemistry , chemistry , electrode , organic chemistry , composite material , composite number , medicine , engineering , endocrinology
The chemical delithiation of LiFePO 4 has been carefully studied using two different types of LiFePO 4 : (1) carbon coated LiFePO 4 and (2) non-carbon coated LiFePO 4 . We have observed that only carbon coated LiFePO 4 can be successfully delithiated at room temperature using Na 2 S 2 O 8 as oxidizing agent. In order to unravel the role of carbon in the chemical delithiation process of non-carbon coated LiFePO 4 we have performed a systematic study using different carbon sources as well as different amount of extraneous carbon in the solution. The results obtained demonstrate that the addition of carbon is fundamental for the effective removal of lithium at room temperature, and only a very small amount of carbon of any nature is enough to achieve the successful chemical delithiation of non-carbon coated LiFePO 4 .