Low-temperature synthesis of a green material for lithium-ion batteries cathode

Figures & data

Figure 1.  X-ray pattern of LiFe_0.8Zn_0.2PO₄ (versus LiFePO₄).

Figure 2.  X-ray pattern of LiFe_0.8Zn_0.2PO₄ (versus Li₂SO₄).

Table 1. The interplanar spacings of our product versus those of LiFePO₄ and Li₂SO₄.

d our product	d LiFePO4	d Li2SO4
4.6861	4.6900
4.2329	4.2700
3.9974		3.9990
3.9242	3.9100
3.6243	3.6900
3.5561	3.4800
3.3313		3.3820
3.2186		3.1770
3.0234		3.0740
3.0142	3.0000
2.9770	2.9990
2.9241	2.8790
2.7659	2.7720
2.6895		2.6910
2.6868		2.6910
2.6361		2.6280
2.5067	2.5160
2.4506	2.4530

Figure 3.  FTIR spectrum of LiFe_0.8Zn_0.2PO₄ (heated at 110°C).

Figure 4.  FTIR spectrum of LiFe_0.8Zn_0.2PO₄ (heated at 650°C).

Figure 5.  TGA diagram of LiFe_0.8Zn_0.2PO₄.

Figure 6.  DTA diagram of LiFe_0.8Zn_0.2PO₄.

Figure 7.  Li-7 MAS-NMR spectrum of LiFe_0.8Zn_0.2PO₄ (spin frequency=8 kHz).

Figure 8.  Li-7 MAS-NMR spectrum of LiFe_0.8Zn_0.2PO₄ (spin frequency=7 kHz).

Table 2. Results from elemental analysis.

Mass (%)	Sample 110°C	Sample 650°C
Iron (%)	20.57	18.43
Lithium (%)	4.63	4.66
Phosphorous (%)	12.78	13.32
Zinc (%)	4.58	4.27