How do you identify an electric drill, a lithium battery and a nickel hydrogen battery?
Single voltage is different: lithium battery single voltage 3.6V or 3.7V, nickel cadmium battery single section 1.2v;
The charge discharge characteristics of different lithium battery: strict control for charging and discharging current, can not be too large, and when the discharge voltage is decreased gradually, but the change is bigger, the lithium battery charging efficiency is high, and there is no memory effect; nickel cadmium battery large current fast charging, and can provide high current load and discharge voltage change is very small charging, but its low efficiency, serious memory effect;
The working principle is different: the lithium battery is equal to a charge container, work basically do not rely on the electrochemical reaction, when charging the battery, lithium ion battery cathode is generated, the generation of lithium ion movement through the electrolyte to the cathode. As the anode carbon is layered structure, it has many micropores, and the negative ion is embedded into the micropores of the carbon layer. The more the embedded lithium ion, the higher the charging capacity. Similarly, when the battery is discharged (i.e., we use the battery), the lithium ions embedded in the negative carbon layer are removed and moved back to the positive electrode. The more lithium ion is back to the positive electrode, the higher the discharge capacity. Nickel cadmium battery work needs the electrochemical reaction, charging electronic along the wire to the cathode, and the cathode of the two water reaction of nickel oxide and nickel hydroxide and sodium hydroxide solution in the formation of hydroxyl ions, chemical energy into electrical energy; discharge cathode in cadmium (Cd) and sodium hydroxide (NaOH) in hydroxide ion (OH-) the synthesis of cadmium hydroxide, and attach to the anode, but also emit electron, chemical energy into electrical energy;
Consisting of different materials: lithium battery with carbon materials (graphite) as anode, lithium containing compounds as anode; nickel cadmium battery cathode by nickel oxide powder and graphite powder as active material, anode active material by cadmium oxide powder and iron oxide powder.
Durable properties of different lithium battery is relatively fragile, over discharge or over charge will cause permanent damage, so you need to install the protection circuit board, and after a lapse of about half a year to maintain a charge and discharge; nickel cadmium batteries can withstand overcharge or overdischarge, simple and convenient operation, placed a long time will not make the performance degradation when after charging can restore the original characteristics;
