Tamilnadu BoardEnglish MediumSTD 12ChemistryElectro Chemistry5 Marks
Question
Describe about lithium-ion battery and its uses.
✓
Answer
1. Lithium-ion battery Anode - Porous graphite Cathode - Transition metal oxide as $CoO _2$ Electrolyte - Lithium salt in an organic solvent 2. At the anode oxidation occurs $ Li _{( s )} \rightarrow Li ^{+}{ }_{( aq )}+ e ^{-} $ At the cathode reduction Occurs. $ Li ^{+}+ CoO _{2( s )}+ e ^{-} \rightarrow Li CoO 2( s ) $ 3. Overall reactions $ Li _{( s )}+ CoO _2 \rightarrow 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 non-aquaeous 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.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.