Page 484 - Handbook of Battery Materials

15.2 Graphitic and Nongraphitic Carbons 457

coke
1st cycle
C irr C rev
2.0
1.8
1.6
discharge
1.4
E / V vs. Li/Li + 1.2 charge
1.0
0.8
0.6
0.4
0.2
0.0
0.0 0.5 x in Li C
x 6
-1
(186) (C / Ah kg )
2nd cycle
2.0
1.8
1.6
1.4
E / V vs. Li/Li + 1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0 0.5 x in Li C
x 6
-1
(186) (C / Ah kg )
Figure 15.14 First- and second-cycle constant-current
charge–discharge curves of coke (Conoco) in
LiN(SO 2 CF 3 ) 2 /ethylene carbonate/dimethyl carbonate as
the electrolyte (C irr = irreversible specific charge; C rev =
reversible specific charge) [2].

structure segments for soft carbons obtained at temperatures between ∼1000 and
◦
∼3000 C has been intensively discussed in a model developed by Dahn’s group
[19, 42], who correlated the measured XRD data with the experimental lithium
storage capacity of a specific carbon material.
In contrast to soft carbons, many nongraphitizing (hard) carbons obtained at
◦
temperatures of ∼1000 C show a high specific charge with little hysteresis (several
−1
hundreds of Ah kg ) which can be reached only at a very low potential of a few