Stabilized electrochemical cell active material

FIG. 4

CELL VOLTAGE vs CAPACITY, CONSTANT CURRENT CYCLING.
BG35/Li EC/DMC + 10% TRIBUTYLAM1NE

o.2mA /cm2 : 2.0-0.01V 2.50

0.00 '| i ' i i | i i i ' | ' i i ' | i ' i ' | ' i i i [ i i i i | i ) i i [ 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0

CAPACITY (mAhr)

FIG. 5

CELL VOLTAGE vs CAPACITY, CONSTANT CURRENT CYCLING.
Li / LMO / EC / DMC LiPF6 +10% TRIBUTYLAMINE (TB)

4.50 Ti

FIG. 6C 1 110H

Q 1.00

LU

g 0.90
<

o 0.80

LiMn204 w / dec. 0.5%Na2CO3 vs. MCMB2528 23 AND 60aC o 1-201 COULOMBIC EFFICIENCY vs CYCLE

LMOROO
LMOROO

1

• i i i i i i i i i i—i—i—i i i i—i—i | i i—i—i—i—i
10 20 30 40 50

CYCLES

i—l—i—i—i—i—[—i—i—i—r—|

60 70 80

FIG. 6D

150n

LiMn204 w / dec. 0.5%Na2CO3 vs. MCMB2528 23 AND 60°C
CATHODE SPECIFIC DISCHARGE CAPACITY vs CYCLE

to

O Ii

Ui

o en <

o

<Si

o II

UJ

s

<

HI

o

CO
Q
O

o

O
CO

Q
UJ

l

O >

o

CO

CO
LLS

°

FIG. 8

GRAPHITE / LiMn204 IMPEDANCE VARIATION DURING 60°C STORAGE - 60

CELLS WITH LMO + NO
L^C03 ADDITION

a' CELLS WITH LMO+1.22% PARTICULATE ... ADDITION

SURFACE MODIFIED LMO CELLS i 1 1 1

5 10 15 20

DAYS STORAGE @60°C

FIG. 9

GRAPHITE / LiMn204 GAS VOLUME VARIATION DURING 60°C STORAGE