LiPF6-EC-DMC

Figure 3. Charge-discharge cycling characteristics of an Li/LiMn, yCo0, 04 coin-type cell (thickness 2 mm, diameter 23 mm). Charge 4.3 V, 1 niAcm-2 discharge 3.3 V, 3 mAcm 2 I molL-1 LiPF6 - EC/DMC (jr I00-x).

Lithium carbonate and hydrocarbon were identified in XPS spectra of graphite electrodes after the first cycle in LiPF6/EC-DMC electrolyte [104]. Electrochemical QCMB experiments in LiAsF6/EC-DEC solution [99] clearly indicated the formation of a surface film at about 1.5 V vs. (Li/Li+). However the values of mass accumulation per mole of electrons transferred (m.p.e), calculated for the surface species, were smaller than those of the expected surface compounds (mainly (CF OCC Li ). This was attributed to the low stability of the SEI and its partial dissolution. 

Toshiba Prismatic LiNio.97Bo.03O2 Hard carbon LiPF6/EC+DMC... 

FIGURE 7.15 First galvanostatic charge/discharge cycle at =0740 of a graphite TIMREX SLX50 electrode in the 1 M LiPF6 + EC DMC electrolyte, (i) to (iii) see text. 

FIGURE 7.16 Irreversible charge consumption in the first cycle at =C/40 of TIMREX graphites in the 1M LiPF6 + EC DMC electrolyte as a function of the graphite BET SSA. 

DSC revealed that the thermal stability of electrochemieally lithiated graphite with 1 M LiPF6/EC + DMC and PVdF-binder has shown a mild heat generation starting from 130 °C with a small peak at 140 °C and continued until a sharp exothermic peak appeared at 280 °C ... 

The product (CH20C02Li)2 seems to form very efficient films on carbon electrodes, where lithium can be cycled close to its optimal capacity hundreds of times in EC/DMC-based solutions of LiAsF6, Lilm, or LiPF6 [199],... 

The design of the 2-electrode electrochemical cells used in this work is state of the art and is based on HS Test Cell available from Hohsen Corp. of Tokyo, Japan [10]. Unless stated otherwise, these cells were tested at 32°C at different cycling rates (from C/20 to C rate) under continuous current. The electrolyte used was EC DMC (1 1), LiPF6 (1M) made by Cheil Industries, South Korea. 

Table 1. Electrochemical characteristics at C/20 rate of a commercial hard carbon, MCMB 2528 and a natural graphite (LBG1025) in half cells with EC-DMC (1 1), LiPF6 (1M).

Figure 6. Galvanostatic charge/discharge curves of natural SLA 1015 at C/20, C/l 0, C/3, C/2 and C rates. Electrolyte EC-DMC (1 1) LiPF6 (1M).

The characteristic reduction semi plateau associated with the SEI formation appears in the 800-600mV region in EC-DMC/LiPF6 electrolyte under C/10 discharge rate [23],... 

Fig. 11.3 Electrochemical performance of CNFs CNTs. (a) Galvanostatic discharge/charge (Li inser-tion/extraction, voltage decrease/increase) curves of CNFs CNTs at a cycling rate of C/5 in 1M LiPF6 in 1 1 (v/v) ethylene carbonate (EC)/dimethyl carbonate (DMC) (b) comparison of the electrochemical performance of pristine CNTs and CNFs CNTs in 1M LiPF6 in EC/DMC solution (reprinted with permission from [25]).

Messina 1995 PC, EC, DMC, DME/LiPF6, LiN(S02CF3)2, IiS03CF3 Effect of solution and cycling 244... 

Lithion s low rate 7Ah cells. The cells were fabricated with Setella E20 separator, 1M LiPF6 in EC DMC DEC (1 1 1) electrolyte and standard cathode components. The charge capacity of each cell is designated at 9 Ah during the C/20 formation cycle. This value is based on a cathode specific capacity of 190 mAh/g at the C/20 rate. The 8 Ah designation for each cell during the initial two C/10 charge cycles is based on a specific cathode capacity value of 170 mAh/g. After a preliminary evaluation of the three formation cycles, the cells were sealed and cycled for additional 7 cycles to stabilize data for the C/10 rate. A 72 h stand test was performed on cells after completion of the ten formation cycles. 

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