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Introduction of Lithium Battery Cathode Materials

Time:2021-01-19 Views:264

  Pu Xun lithium battery cathode materials are currently being used and developed, mainly including lithium cobalt oxide, lithium nickel cobalt oxide, nickel cobalt manganese ternary materials, spinel lithium manganese oxide, olivine lithium iron phosphate, direction, Chinese Cathode materials mainly include lithium cobaltate, ternary materials, lithium manganese and lithium iron phosphate. The application areas of cathode materials are clearly divided. At present, lithium cobalt oxide is still the main force in the field of small lithium batteries, mainly used in the traditional 3C field; ternary materials and lithium manganese oxide are mainly used in small lithium batteries. Japan and South Korea have relatively mature technologies as power batteries, which are mainly used in power tools, electric bicycles, and electric vehicles. Lithium iron phosphate is my country's application in the field of power batteries, and is the development direction of energy storage batteries in the future. Mainly used in base station and data center energy storage, home energy storage, wind power storage and other fields.

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  1. Lithium Cobalt Oxide

  Lithium cobalt oxide is currently the most successful and widely used cathode material used by lithium battery manufacturers. It has good reversibility, discharge capacity, charge and discharge efficiency and voltage stability.

  2. Lithium nickel oxide

  LiNiO2 has the same cubic salt structure as LiCoO2, but its price is lower than LiCoO2. The theoretical capacity of LiNiO2 is 276mAh/g, the actual specific capacity is 140-180mAh/g, and the working voltage range is 2.5V~4.2V[66]. LiNiO2 has good high temperature stability, low self-discharge rate and no pollution. Liio2 is a layered compound and has been studied more after LiCoO2. However, LiNiO2 as a cathode material for lithium batteries urgently needs to solve the following problems.

  3. Lithium manganese oxide

  my country is rich in manganese resources, and manganese is non-toxic and low-pollution. Therefore, layered LiMnO2 and spinel LiMn2O4 have become the research hotspots of cathode materials.

  4. Manganese nickel cobalt composite oxide

  The advantages of layered Mn-Ni-Co composite oxide cathode materials combined with LiCoO2, LiNiO2 and LiMnO2 layered materials, its comprehensive performance is better than any cathode material higher than a single component, and there is an obvious tripartite synergistic effect: the introduction of lithium battery production plants It can effectively reduce the mixed occupancy rate of cations and stabilize the layered structure material; by introducing Ni, the material capacity can be increased. The introduction of Mn can not only reduce material costs, but also improve material safety. The charge and discharge platform of LiMnxNiYCo1-X-Yo2 material is slightly higher than that of LiCoO2. The lithium battery production plant is suitable for various existing lithium battery applications and is expected to replace various other cathode materials.

  5. Lithium vanadium oxide

  Vanadium is a multivalent metal that can form a variety of oxides with lithium, including flake LiVO2, LiXV2O4, Li1+ XV3O8, spinel Liv2O4 and inverse spinel LivMo4 (M=Ni,Co).

  Daily charging, maintenance and storage of lithium batteries

  If the 0% power is 0V, or low enough to damage the battery, an over-discharge event will occur. The phone will shut down before that. RC without a protection circuit is another matter, but consumer devices like mobile phones are designed with battery specifications in mind. For some chargers, when fully charged, the battery pack will turn off charging, and when the power is exhausted, the battery pack will start charging again.

  When the current drops below 20mA, the charging circuit in the phone is set to cut off the battery. This will ensure that the battery is not overcharged. In addition, if it is a 3.8 volt battery, when the voltage drops below 2.4 volts, the phone will disconnect, telling you that it is time to charge. This circuit has been used for at least 10 years and has improved battery life. The charging circuit includes a timer to periodically release the battery from the charge to measure 1-2 seconds, and then replace it.

  You can charge the battery at any time. Partial discharge to 50% or more before charging is better than full discharge, and battery life is longer. This is not required, but you may need to calibrate the battery meter by performing a full discharge or charge cycle every few months. Explain that the physical cell itself does not have a complete cycle (in fact, they are not very ideal), but because of how the smart components of the mobile phone and the charger measure the battery (cannot be directly measured, so according to the estimated fully charged and fully discharged battery, if you just A charging or discharging cycle, the measurement will become more and more inaccurate over time. If you do not calibrate your battery, your battery can still be used for a long time, but the degree of battery fullness is different from the actual charging Yes. Don’t worry about overcharging, because the complexity of your phone will stop charging when the battery is fully charged. When the voltage drops to a certain level, the phone will automatically shut down to protect the battery from being completely discharged.


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