Complexing Agents on Carbon Content and Lithium Storage Capacity of LiFePO₄/C Cathode Synthesized via Sol-Gel Approach

Table 2

Comparison of reversible capacity, carbon content in LiFePO₄/C products, and the complex stability constants () between chelating agents with iron ions.

Complex agent	Fe state		Capacity (mAh/g)	Carbon content (wt.%)
Hydroxyl	Fe^2+	5.7	60	0
	Fe^3+	11.9	20	0
Oxalic acid	Fe^2+	4.7	66	~0
	Fe^3+	9.4	33	~0
Citric acid	Fe^2+	15.5	136	5.1
	Fe^3+	25.0	95	10.1
Ethylene glycol	Fe^2+	9.7	145	3.6
	Fe^3+	29.7	75	9.4