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Describe about lithium - ionbattery and its uses. |
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Answer» Solution :(i) Lithium-ion battery `{:("Anode",:,"Porous graphite"),("CATHODE",:,"Transition metal oxide as " CoO_2),("Electrolyte",:,"Lithium salt in an orgainc solvent"):}` (ii) At the anode oxidation occurs `Li_((s)) to Li_((aq))^(+) + e^(-)` At the cathode reduction occurs. (iii) Overall reactions `Li_((s)) + CoO_(2) to Li CoO_(2(s))` (iv) Both electrodes ALLOW `Li^(+)` ions to move in an out of their structures. During discharge the `Li^(+)` ions produced at the anode moves TOWARDS cathode through the non-aquaeous electrolyte. (v) 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. (vi) Uses : This Li-ion battery is used in celluar phones, LAPTOP computer and digital camera. |
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