Describe about lithium-ion battery and its uses.

1.	Describe about lithium-ion battery and its uses.
Answer» 1. Lithium-ion battery Anode : Porous graphite Cathode : Transition metal oxide as CoO₂ Electrolyte : Lithium salt in an organic solvent 2. At the anode oxidation occurs Li_(s) —Li⁺_(aq) + e^- At the cathode reduction occurs. Li⁺ + CoO_2(s) + e^- → Li CoO_2(s) 3. Overall reactions Li_(s) + CoO₂ → Li CoO_2(s) 4. Both electrodes allow Li⁺ ions to move in and out of their structures. During discharge the Li⁺ ions produced at the anode moves towards cathode through the nonaquaeous electrolyte. 5. When a potential greater than the emf produced by the cell is applied across the electrode, the cell reaction is reversed and now the Li⁺ ions move from cathode to anode where they become embedded on the porous electrode. This is known as intercalation. 6. Uses:- This Li-ion battery is used in cellular phones, Laptop computer and digital camera.

Answer»

1. Lithium-ion battery

Anode : Porous graphite

Cathode : Transition metal oxide as CoO₂

Electrolyte : Lithium salt in an organic solvent

2. At the anode oxidation occurs

Li_(s) —Li⁺_(aq) + e^-

At the cathode reduction occurs.

Li⁺ + CoO_2(s) + e^- → Li CoO_2(s)

3. Overall reactions

Li_(s) + CoO₂ → Li CoO_2(s)

4. Both electrodes allow Li⁺ ions to move in and out of their structures. During discharge the Li⁺ ions produced at the anode moves towards cathode through the nonaquaeous electrolyte.

5. When a potential greater than the emf produced by the cell is applied across the electrode, the cell reaction is reversed and now the Li⁺ ions move from cathode to anode where they become embedded on the porous electrode. This is known as intercalation.

6. Uses:- This Li-ion battery is used in cellular phones, Laptop computer and digital camera.

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