Supporting Information High-strength Internal Crosslinking Bacterial Cellulose Network Based Gel Polymer Electrolyte for Dendrite-suppressing and High-rate Lithium Batteries Dong Xu a,b, Bangrun Wang a,b, Qing Wang a,b, Sui Gu a,b, Wenwen Li a,b, Jun Jin a, Chunhua Chen c, and Zhaoyin Wen a,* a. CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China. b. University of Chinese Academy of Sciences, Beijing 100049, P. R. China c. CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China. *. Corresponding author Tel: +86-21-52411704, Fax: +86-21-52413903 E-mail: zywen@mail.sic.ac.cn. S-1
Figure S1 SEM images of (a) freeze-dried and (b) oven-dried BC films. Figure S2 TGA curves of BC-GPES and commercial separator obtained in air atmosphere in the temperature range of 50 C to 500 C at a rate of 10 C min-1. S-2
Figure S3 Optical images of BC-GPE for the bending measurement. The obtained BC-GPE shows good bending property. As shown in Figure S3a, the gel polymer electrolyte was rolled on a glass rod without any rupture. When further unfolded (Figure S3b), the BC-GPE could recovered to be a flat film without damage. The excellent bending property of BC-GPE was predicted by the tensile strength test in Figure 3d. The outstanding blending property of BC-GPE makes it possible to be used in flexible energy storage systems. Figure S4 Galvanostatic cycling test of LiLE-SLi at 0.5 ma cm -2. S-3
Figure S5 Initial chargedischarge cycles of LiFePO 4 BC-GPELi and LiFePO 4 LE-SLi batteries Figure S6 EIS plots of the LiFePO 4 BC-GPELi and LiFePO 4 LE-SLi batteries before and after 150 cycles at 5C. S-4
Figure S7 SEM images of (a) the lithium anode of the LiFePO 4 LE-SLi battery, and (b) the lithium anode of the LiFePO 4 BC-GPELi battery after 150 cycles at 0.5C S-5
Figure S8 Galvanostatic cycling tests of (a) LiBC-GPELi cells and (b) LiLE-SLi cells at 0.5 S-6
ma cm -2. Figure S9 Cycling performances of LiFePO 4 LE-SLi batteries at (a) 0.5C and (b) 5C; cycling performances of LiFePO 4 BC-GPELi batteries at (c) 0.5C and (d) 5C. S-7
Figure S10 Schematics of the morphological changes of lithium anode with (a) commercial separator and liquid electrolyte and (b) BC-GPE during chargedischarge cycles. S-8
Table S1 Mechanical properties comparison of various gel polymer electrolytes Reference Gel polymer electrolytes Tensile strength (MPa) Our work BC-GPE 49.9 1 NonwovenP(VDF-HFP) 30.7 2 Electrospun PVDFHydroxyethyl cellulosepvdf 21.5 3 PEOPEGLATP 3.6 4 TPUPVDF 9.7 5 Cellulose acetate-liclo4 43.29 6 DEBAPEGDEDPPO 3D-GPE 16.3 7 Silk fibroinionic liquid 2.0 8 LiPBPABPEO 9.0 9 PPCCellulose 25 10 Poly (vinylene carbonate) 41.4 S-9
Table S2 Electrolyte conservation rates of both BC-GPE and LE-S GPE conservation Ionic conductivity BC-GPE 93.32% 4.04 10-3 S cm -1 LE-S 21.29% 6.31 10-4 S cm -1 S-10
Table S3 Ionic conductivity and rate comparison of various gel polymer electrolytes Reference Gel polymer electrolytes Ionic conductivity 25 C (S cm -1 ) at Discharge capacity (ma h g -1 ) Our work BC-GPE 4.04 10-3 3C 142.9 126.6 79.50 11 PVDF-HFPPEOPS 3.26 10-4 3C 12 PVDF-HFPIonic liquid 6.93 10-5 3C 60 13 Electrospun PVDF-HFPIonic liquid 1.50 10-3 2C 120 90 14 PEO 3.30 10-3 3C 100 2 Electrospun PVDFHydroxyethyl cellulosepvdf 8.80 10-4 0.2C 3C 140 15 PMMAPolyurethane acrylateionic liquid 2.76 10-4 80 S-11
3C 16 poly(ε-caprolactone) Ethylene carbonate 2.20 10-4 3C 0.5C 88 17 POSSIonic liquid 6.31 10-4 3C 18 Poly (methyl methacrylate-maleic anhydride) 3.79 10-3 3C 19 Lignocellulose Polyethylene Glycol 3.22 10-3 2C 140 100 20 Electrospun PANTEOSPSZ 1.04 10-3 2C 120 115 21 PVDF-HFPOligomeric ionic liquid 1.50 10-3 3C 117 22 Poly(styrene-co-methyl acrylate) 1.20 10-3 2C 139 102.5 S-12
23 Electrospun Poly fluoride) (vinylidene 2.60 10-4 3C 86.7 24 Polyoxyethylene-b polyacrylonitrile network 1.60 10-3 3C 100 Table S4 Fitting results of the EIS plots of the LiFePO4BC-GPELi and LiFePO4LE-SLi batteries before and after 150 cycles at 0.5C Battery Before cycling After cycling Rb (Ω) Rƒ (Ω) Rb (Ω) Rƒ (Ω) Rct (Ω) LiFePO4BC-GPELi 2.55 31.20 4.80 47.60 13.50 LiFePO4LE-SLi 2.01 59.10 12.10 109.00 23.70 S-13
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