Charge natural graphite

Figure 6. Low rate charge discharge performance of natural graphite electrode [13J.

Figure 4. Charge/discharge curves of the surface treated natural graphite SLC1015 vs. Li/Lt in MLiPF6, EC.DMC (50 50 wt%).

Figure 5. First charge and discharge of CR2016 coin type half-cells with anodes based on the 15 pm, spheroidized natural graphite (bold line) and the similar graphite modified by 8wt% Si at the C/15 rate.

The cycling improvement for the Cu-metallized graphite over the pristine graphite was also observed by K. Guo et al. [15] in their study of electroless Cu deposited on graphite cycled in a lithium cell with a 20% PC blend electrolyte. Also, they recorded a rate capability improvement in their Cu graphite material as well. At a current density of 1.4 mA/cm2, the cell achieved about 60% ( 200 mAh/g) of the charge capacity measured at 0.14 mA/cm2, compared to about 30% ( 100 mAh/g) for the non-treated pristine natural graphite cell [15]. 

High-crystallinity natural graphite materials are attractive active materials in the negative electrode of lithium-ion batteries due to their high theoretical reversible charge capacity of 372 mAh g 1 as well as the low and flat potential profile below 0.2 V vs. Li/Li+, which are important features which are needed to improve the energy density of portable lithium-ion batteries. The drawbacks for the... 

Figure 2. Galvanostatic charge/discharge curves of natural graphite LBG1025 at C/20, C/5 and C/2 rates. Electrolyte EC-DMC (1 1) LiPF6 (1M).

---