The difference between lithium manganate battery, lithium iron phosphate battery and lithium cobalt oxide battery

- Aug 31, 2018 -

Lithium Manganate Battery: A lithium manganate battery refers to a battery using lithium manganate as a positive electrode. Its nominal voltage reaches 3.8V, which is widely used because of its low cost and good safety. A cathode material with low cost, safety and low temperature performance, but the material itself is not stable and easily decomposed to generate gas, so it is often used in combination with other materials to reduce the cost of the battery core, but its cycle life decays faster. It is prone to bulging, low temperature performance and relatively short life. It is mainly used for large and medium-sized batteries and power batteries. Its nominal voltage is 3.7V.

Lithium iron phosphate battery: Lithium iron phosphate battery has the advantages of high temperature performance, light weight, no memory effect, environmental protection, large capacity and so on. During the sintering process in the preparation of lithium iron phosphate, iron oxide is likely to be reduced to elemental iron under a high temperature reducing atmosphere. Elemental iron can cause micro short circuit of the battery, which is the most taboo substance in the battery. This is also the main reason why Japan has not used this material as a positive electrode material for a lithium-ion battery. Lithium iron phosphate has some performance defects, such as low tap density and compaction density, resulting in lower energy density of lithium ion batteries. Low temperature performance is poor, even if it is nano-sized and carbon coated, this problem is not solved. The preparation cost of the material and the manufacturing cost of the battery are high, the battery yield is low, and the consistency is poor.

Lithium cobaltate battery: Lithium cobaltate battery has stable structure, high specific capacity and outstanding comprehensive performance, but its safety is poor and the cost is very high. It is mainly used for small and medium-sized batteries, widely used in notebook computers, mobile phones, MP3/4 and other small In electronic equipment, the nominal voltage is 3.7V. Excellent electrochemical performance: average capacity attenuation of <0.05% per cycle per cycle; initial discharge specific capacity >135mAh/g; 3.6V initial discharge platform ratio >85%. Excellent processing performance: high tap density, help to increase the volumetric capacity of the battery, stable product performance and good consistency. The application of lithium cobalt oxide battery is still relatively small. The technology of cobalt lithium for small batteries is very mature, but the cost of cobalt lithium is too high. Many companies use manganese lithium instead, and some are manganese. Lithium cobaltate has stable performance. Currently, the technology used in mobile phones is the most mature, but the biggest disadvantage of application is high cost. Cobalt is a scarce strategic metal. In addition, it is also difficult to apply to power batteries.