1. Thermal stability

• LiFePO4 is made of a skeleton of PO4 polyanions that is very stable thermally while favorable to one dimensional Li+ ion reversible diffusion
• Covalent P-O bond stabilize the oxide when fully charged and avoid O2 release making LiFePO4 the most stable commercial cathode material
• LiFePO4 stability and tolerance to overcharge make possible cost reduction associated to external safety devices

2. Good electrochemical characteristics

• Long calendar life for the stable olivine structure
• High tolerance to high and low-voltage abuse
• Lower thickness change of full cell during charge and discharge

3. Abundant resource of basic elements

• Fe and P are common components

4. Environmentally friendly

• No toxic element

---

Why C-LiFePO4 ?

Some physical parameters of cathode materials

Pure LiFePO4, shows lower conductivity for the one-dimensional model of Li+ diffusion among 3D structure. Lower solid diffusion coefficient and electron conductivity, are major problems before it can be applied in power cell.

How to improve conductivity and rate performance ?