High二〇utput Lithium‑ion

Battery Elect｢odeA

okyo lnstitute ofechnology research group

RhharS.:ugChC efeudnecei inn aplrOmdautcei,:慧i
processing based upon aerosol use, ananocomposite electrode for the re‑chargeable lithium‑ion battery which
promises to be of practical use in elec‑
tric vehicles and other such applications.

Led by Dr･ Taniguchi lzumi of theDepartment of Chemical Engineerlng

located at the Universlty's Ookayama
campus, the researchers found a way to一三⊃Z

produce the electrode which is seen
making possible an energy output of90% of theoretical range. To date, other∪コC)一NVl tl凸｣○>S山ト∝⊃OU

types of electrode for the rechargeable

battery being researched have much
lower output capacities.

The electrode is produced bymaking use of the olivine structure,
which is a lithium manganese phos‑
phate exhibiting high stability as astructure. Until now there has been
research ongoing on LiFePO4 but at
most a voltage of 3.4V for a battery

that were usable with their lithium‑ion

around 50‑60oC) without depletinguslng this material has been realized･

battery prototype･ By adoptlng therare materials such as cobalt holds

However, the Taniguchi team preparedresultant electrode into the battery, athe Hmore difficult to processH olivine‑

voltage of approximately 4･1V was

great promise･
Prior to assumlng his current po‑

structured LiMnPO4 (having a muchachieved in addition to the marking ofsition, Dr･ Taniguchi spent some time

lower electronic conductivlty thana high percentage of energy output,

as associate professor at the Tokyo

LiFePO4) for use as the functional ma‑

ninth‑tenths of the theoretical maxi‑

institute of Technology International

terial in their new lithium‑ion battery

mum output･

Cooperation Center for Science andelectrode. Actually, the conventional

Dr･ Taniguchi says he hopes in‑Technology･ As such, he has beenlithium‑ion battery available for use

dustry will soon be able to find ways

working closely with researchers whowith portable electronic devices uses

to produce the electrode en masse byhave come from overseas to study atlithium cobalt oxide, in which cobalt is

adaptlng the manufacturing systems･

the top‑level research institution･ Hisa rare element; thus, Widespread use forDr･ Taniguchi's effort, to make possi‑

research team members Dr. Zhumabay

the electric vehicle as well as the Smartble a rechargeable lithium‑ion battery

Bakenov and The Nan Long Doan

Grid has been hampered.

welトsuited for use with the electricstudied LiMnPO4/C nanocomposite

The Taniguchi lab developed anvehicle, Smart Grid and other applica‑

innovative method‑a combination oftions, was supported in part by thepowder preparation･ The Nan Long
Doan is a scholarship student in thespray pyrolysIS uSlng aerosol technolo一

New Energy and Industrial Technology

ASEAN Universlty Network/Southeastgy along with wet ball‑milling, fol‑
lowed by heat treatment‑that could

Development Organization (NEDO)･
NEDO clearly has targeted the support

Asia Englneering Education

produce nanocomposite powders

well since not only can a higher elec‑Net) proj.ect of the Japan International

which mixed high crystalline LiMnPO4

trical capaclty for a battery be realized

CooperatlOn Agency (JICA)･

nanoparticles with carbon effectively･

with the Taniguchi electrode but also

The LiMnPO4/C nanocomposite pow‑

the ability to be recharged repeatedlyK Pomeroy lS a JOurnaIISt and columnlSt SPeClallders attained electrochemical properties

even at high temperatures (up totZlng ln SClen⊂e and te⊂hno】ogy28

TheJapanJournal JULY2010

Development Network (AUN/SEED‑田