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Preparation of Li 4 Ti 5 O 12 Yolk–Shell Powders by Spray Pyrolysis and their Electrochemical Properties
Author(s) -
Yang Kwang Min,
Ko You Na,
Yun JungYeul,
Kang Yun Chan
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201301366
Subject(s) - materials science , lithium (medication) , spray pyrolysis , anode , shell (structure) , titanium , pyrolysis , particle (ecology) , electrochemistry , chemical engineering , carbon fibers , nuclear chemistry , metallurgy , composite material , nanotechnology , electrode , chemistry , composite number , medicine , thin film , oceanography , endocrinology , geology , engineering
Abstract We have reported for the first time the preparation of yolk–shell‐structured Li 4 Ti 5 O 12 powders for use as anode materials in lithium‐ion batteries. One Li 4 Ti 5 O 12 yolk–shell‐particle powder is directly formed from each droplet containing lithium, titanium, and carbon components inside the hot wall reactor maintained at 900 °C. The precursor Li 4 Ti 5 O 12 yolk–shell‐particle powders, which are directly prepared by spray pyrolysis , have initial discharge and charge capacities of 155 and 122 mA h g −1 , respectively, at a current density of 175 mA g −1 . Post‐treatment of the yolk–shell‐particle powders at temperatures of 700 and 800 °C improves the initial discharge and charge capacities. The initial discharge capacities of the Li 4 Ti 5 O 12 powders with a yolk–shell structure and a dense structure post‐treated at 800 °C are 189 and 168 mA h g −1 , respectively. After 100 cycles, the corresponding capacities are 172 and 152 mA h g −1 , respectively (retentions of 91 and 90 %).