That depends on which production department you are in charge of. If it is the quality inspection of cathode materials department, your job may be to check the purity or density of products such as lithium ferrous phosphate and lithium cobaltate. If it is the quality inspection of the negative electrode materials department, it is necessary to check the carbon purity, vibration density, compaction density, specific surface area, or the analytical instruments that operate abnormally. If you are the supervisor of finished battery, you should check the capacity, yield and other very professional data.

Lithium-ion batteries have the following advantages:

1. High energy density: it varies with different electrode materials, and can reach150 ~ 200 wh/kg (540 ~ 720 kj/kg) by mass; Calculated by volume, it can reach 250 ~ 530 Wh/L (0.9 ~1.9 kJ/cm3).

2. High open circuit voltage: it varies with different electrode materials and can reach 3.3 ~ 4.2V ..

3. High output power: according to different electrode materials, it can reach 300 ~ 1500 W/kg (@ 20s).

4. No memory effect: Lithium iron phosphate lithium ion battery has no memory effect, and the battery can be charged and discharged at any time without discharging, so it is convenient to use and maintain.

5. Low self-discharge: 6. Wide working temperature range: it can work normally between -20℃ and 60℃.

7. Fast charging and discharging speed

Therefore, lithium-ion batteries are widely used in consumer electronics, military products, aviation products and so on.

Lithium-ion battery is a rechargeable battery, which mainly depends on the movement of lithium ion between the positive electrode and the negative electrode. Lithium-ion batteries use embedded lithium compounds as electrode materials. At present, the commonly used cathode materials for lithium ion batteries are lithium cobaltate (LiCoO2), lithium manganate (LiMn2O4), lithium nickelate (LiNiO2) and Ferrous lithium phosphate (LiFePO4). At the same time, lithium-ion batteries also have the following disadvantages:

(1) is not resistant to overdischarge: When overdischarge occurs (when the voltage is less than 3.0V), the excessively embedded lithium ions will be fixed in the crystal lattice and cannot be released again, which will shorten the service life and damage the battery more easily. Therefore, using extremely low battery capacity is harmful to the battery, but it is possible to reactivate the maximum storage capacity of the battery as long as it is charged to a high voltage several times.

(2) Overcharge resistance: When the electrode is overcharged, too many lithium ions are intercalated and cannot be replenished in time, which may lead to lattice collapse for a long time, thus irreversibly reducing the storage capacity. Therefore, the lithium battery must be used frequently to avoid being continuously plugged into the charger connector after being fully charged, and to make the stored electrons flow regularly and properly to maintain the long-term health of the battery.

(3) Aging and fear of heat: Unlike other rechargeable batteries, lithium-ion batteries will inevitably slowly and naturally decline during their service life. Even if it is not used, its capacity will decrease, regardless of the number of times of use (unless it is lattice loss caused by overcharge and discharge cycles, such aging process is called loss), but it is related to temperature.

The possible mechanism is that the internal resistance increases gradually, which makes it easier to reflect the thermal attenuation phenomenon in electronic products with high working current, and also avoids the influence of external temperature. It seems that replacing graphite with lithium titanate can prolong the service life.