«СОВРЕМЕННЫЕ ДОСТИЖЕНИЯ И ТЕНДЕНЦИИ ХИМИИ И ХИМИЧЕСКОЙ ТЕХНОЛОГИИ В XXI ВЕКЕ»
«XXI ҒАСЫРДАҒЫ ХИМИЯ ЖӘ
НЕ ХИМИЯЛЫҚ ТЕХНОЛОГИЯНЫҢ ЗАМАНАУИ ЖЕТІСТІКТЕРІ МЕН ТЕНДЕНЦИЯЛА
РЫ»
0
20
40
60
80
100
120
140
1,4
1,6
1,8
2,0
2,2
Vol
tage
(V
)
Gravimetric capacity (mAh/g)
LFP 95%, CNT 1%, SBR 4%
LFP 95%, CNT 1%, CMC 4%
LFP 95%, CNT 1%, SBR:CMC (1:1) 4%
Figure 1 – Galvanostatic discharge curves of cells with a positive
electrode based on LiFePO4 and various polymer binders (4% by
weight): SBR, CBR and SBR:CMC. Current – 10 mA/g
By selecting the composition of the electrode paste, electrodes with
thicknesses of 200, 400 and 600 microns were obtained, which did not
crack after drying. Moreover, after several experiments, it was found out
that the SBR in the electrode paste should be slightly more than CMC.
The most optimal composition turned out to be: 90% active material;
4.5% carbon black C45; 0.5% CNT; 3% SBR; 2% CMC.
A comparison of the best obtained result of testing an electrochemical
cell with a cathode mixed with water with the results of testing an
electrochemical cell with a cathode of the same composition, but already
with a polymer binder PVDF is shown in Figure 2, showed that the
replacement with a water-soluble polymer did not affect the capacity of
the electrochemical cell.
0
20
40
60
80 100 120 140 160
1,4
1,6
1,8
2,0
2,2
Vol
tage
(V
)
Capacity (mAh/g)
LFP 95%, CNT:C45 (1:9) 5 %, Solef 5130 5%
LFP 95%, CNT:C45 (1:9) 5 %, SBR:CMC (3:2) 5%
Figure 2 – Galvanostatic discharge curves of cells with a positive
electrode based on LiFePO4 and various polymer binders
(4% by weight): Solef5130 and SBR:CMC. Current – 10 mA/g
Testing data were also obtained for an electrochemical cell with
a graphite anode with a water-soluble polymer polymer binder and a
LiFePO4 cathode with a PVDF binder (Figure 3). A mixture of SBR
and CMC polymers was used as a polymer in a ratio of 3:2 by volume
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2,0
2,5
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3,5
4,0
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