Supporting information for

Nanotechnology enabled rechargeable

Li−SO2 battery: Another approach towards

post lithium-ion battery system

Goojin Jeonga, Hansu Kimb,*, Jong Hwan Parka, Jaehwan Jeona,b, Xing Jinc, Juhye

Songb, Bo-Ram Kimb, Min-Sik Parka, Ji Man Kimc,*, Young-Jun Kima,*

a Advanced Batteries Research Center, Korea Electronics Technology Institute,

Seongnam, 463-816, Republic of Korea

b Department of Energy Engineering, Hanyang University, Seoul, 133-791, Republic

of Korea

c Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, Republic of

Korea

Supplementary Fig. S1. SEM images of various carbon materials used in this study:

(a) KB-600JD, (b) OMC, (c) rGO, (d) CS, and (e) MSP-20

Supplementary Fig. S2. (a) N2 adsorption/desorption isotherm and (b) the pore size

distribution of various carbon materials used in this study

0.0 0.5 1.00

500

1000

1500 KB-600JD OMC rGO CS MSP-20

V (c

m3 g

-1)

P/Po

1 10 100

0.00

0.05

0.10

0.15

0.20

Incr

emen

tal p

ore

volu

me

(cm

3 g-1)

Pore size (nm)

KB-600JD OMC rGO CS MSP-20

(a)

(b)

Supplementary Fig. S3. SEM-EDS mapping for the discharged carbon cathode in a

Li–SO2 cell

Supplementary Fig. S4. The SEM images of (a) top-view and (b) cross-section of

the rGO electrode used in this study.

Supplementary Fig. S5. Photo-snapshots of flammability-tests for LiAlCl4⋅xSO2

inorganic electrolyte and 1 M LiPF6 in the mixture of ethylene carbonate (EC) and

ethyl methyl carbonate (EMC) as one of organic-based electrolytes. The electrolyte-

soaked tissue was forced to be contact with an open flame.

Supplementary Fig. S6. Conductivity of LiAlCl4⋅3SO2 electrolyte in comparison

with some conventional organic-based electrolytes (LiTFSI: lithium bis-

trifluoromethanesulfonimide, DME: dimethyl ether, DOL: 1,3-dioxolane, EC:

ethylene carbonate, DMC: dimethyl carbonate).

Supplementary Table S1. Estimation of theoretical energy density of Li–SO2

system

Assuming 3Li + LiAlCl4⋅3SO2 ↔ 3LiCl + LiAlCl(SO2)3 , according to the literature

[10]

Discharge Capacity Specific Energy

Density

(mAh/g) (Wh/kg)

Based on the mass of [catholyte] 219 689

Based on the mass of [discharge products] 207 651

Based on the mass of [discharge products +

carbon] 171 540

1) Capacity based on the mass of carbon cathode: 1000 mAh/g 2) Corresponding carbon mass for the reaction of 1g-catholyte: 0.219 g 3) Operational voltage: 3.15 V