Premium
Dual‐Carbon Network for the Effective Transport of Charged Species in a LiFePO 4 Cathode for Lithium‐Ion Batteries
Author(s) -
Ding Bo,
Ji Ge,
Sha Zhou,
Wu Jishan,
Lu Li,
Lee Jim Yang
Publication year - 2015
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201402117
Subject(s) - materials science , graphene , lithium (medication) , carbon fibers , cathode , pyrolysis , chemical engineering , battery (electricity) , composite number , ion , nanotechnology , composite material , chemistry , power (physics) , organic chemistry , medicine , physics , quantum mechanics , endocrinology , engineering
Cost and safety considerations have driven up the interest in LiFePO 4 as a lithium‐ion battery cathode material. Carbon nanopainting is currently the most common approach to increase the power density of LiFePO 4 , but more can be done to improve the application performance further. In this study the rate performance of LiFePO 4 was increased by using a conductive dual‐carbon network that can extract and conduct electrons from the Li + storage host more effectively than common pyrolyzed carbon. The dual‐carbon network consists of a connected network of graphene sheets and a nanoscale continuous coating of pyrolyzed conductive carbon on the surface of the aggregated LiFePO 4 nanocrystals. Such a construction supports fast electron transport between the aggregated LiFePO 4 nanocrystals as well as within them. Consequently the LiFePO 4 /C composite fabricated as such delivered very high rate performances even at very high discharge rates (104 mAh g −1 at 50 C where 1 C =170 mA g −1 ).