Nanosilica/carbon Composite Spheres as Anode in Li-ion Batteries with. Excellent Cycle Stability. Mingqi Li a, b, Yan Yua, Jing Lia, Baoling Chena, Xianwen ...
Nanosilica/carbon Composite Spheres as Anode in Li-ion Batteries with Excellent Cycle Stability Mingqi Li a, b, Yan Yu a, Jing Li a, Baoling Chen a, Xianwen Wu a, Ye Tian a and P. Chen a,* Department of Chemical Engineering, University of Waterloo, Waterloo, N2L3G1 Canada College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637009, China
TG DTA
90
-0.5 80
70 -1.0 60
50
0
100
200
300
400
500
600
700
800
900
Temprature Difference / oC
0.0
100
Weight/%
-1.5 1000
Temprature/oC
Figure S1 TG analysis curves of the nanosilica/carbon composite spheres 0.5
0.5
(b)
(a) 0.0
0.0
1st 2nd 3rd-5th
-0.5
I/mA
b
I/mA
a
-1.0
-1.0
-1.5
-1.5 0.0
0.5
1.0
1.5
2.0
Potential/V (vs Li+/Li)
2.5
3.0
1st 2nd 3rd-5th
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Potential/V (vs Li+/Li)
Figure S2 CV curves of the nanosilica/carbon composite spheres in electrolytes with VC additive (a) and without additives (b)
3.0
(a)
0.2
(b)
2.5
1st cycle 2nd cycle 3rd-5th cycle
-0.2
-0.4
-0.6
1st
2.0
Voltage/V
I/mA
0.0
2nd
1.5 1.0 0.5 0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0
150
300
450
Specific Capacity/mAh g-1
Potential/V (vs Li+/Li)
3.0
(c)
2.5
1st
Voltage/V
2.0
2nd
1.5 1.0 0.5 0.0 0
50
100
150
200
250
300
Specific Capacity/mAh g-1
Figure S3 CV curves (a) and charge-discharge profiles (b) of the disordered carbon excluding nanosilica; Charge-discharge profiles of the pristine nanosilica (c) 110
80
100 80
Coulombic efficiency
400
70 60 50 40
200
30 20
Specific Capacity/mAh g-1
Specific Capacity/mAh g-1
Discharge capacity
10 0
0
50
100
150
200
250
100
70
90 Coulombic Efficiency/%
(a)
110
0 300
Discharge capacity
60
90 80
Coulombic efficiency
50
70 60
40
50
30
40
20
30 20
10 0
Cycle Number
(b)
Coulombic Efficiency/%
600
10 0
50
100
150
200
250
0 300
Cycle Number
Figure S4 Cycle performance of the disordered carbon and pristine nanosilica composite spheres
200 180 160
Before cylcing 1st cycle 50th cycle 100th cycle
140 Zim/
120 100 80 60 40 20 0
0
20
40
60
80
100 120 140 160 180 200 Zre/
Figure S5 EIS of the nanosilica electrode before cycling and after different cycles