What are the five major disadvantages of Portable Power Stations?
Selecting lithium iron phosphate battery as the positive electrode material of power Portable Power Station, market analysts from the government, scientific research institutions, enterprises and even securities companies are optimistic about this material and regard it as the development direction of power Portable Power Station.
1. The main disadvantages of Portable Power Stations are as follows:
1. Portable Power Stations have some performance defects, such as low tap density and compaction density, resulting in low energy density of lithium-ion batteries. The low temperature performance is poor, and even nano-encapsulation and carbon coating did not solve this problem.
2. During the sintering process during the preparation of Portable Power Stations, iron oxide may be reduced to elemental iron in a high-temperature reducing atmosphere. Elemental iron can cause micro-short circuit of the battery and is the most taboo substance in the battery.
3. Poor product consistency. At present, there is no lithium iron phosphate material factory in China that can solve this problem. From the perspective of material preparation, the synthesis reaction of lithium iron phosphate is a complex heterogeneous reaction, including solid phase phosphate, iron oxide and lithium salt, plus carbon precursor and reducing gas phase. In this complex reaction process, it is difficult to ensure the consistency of the reaction.
4. Intellectual property issues. At present, the basic patent of lithium iron phosphate is owned by the University of Texas, and the carbon coating patent is applied by Canadians. These two basic patents cannot be bypassed. If the patent royalty is included in the cost, the product cost will be further increased.
5. The preparation cost of the material and the manufacturing cost of the battery are higher, the yield of the battery is low, and the consistency is poor. Although the nanoscale and carbon coating of lithium iron phosphate improves the electrochemical performance of the material, it also brings other problems, such as the reduction of energy density, the increase of synthesis cost, poor electrode processing performance, and harsh environmental requirements. Although the chemical elements Li, Fe and P in lithium iron phosphate are very rich and the cost is low, the cost of the prepared lithium iron phosphate product is not low. Even if the early research and development costs are removed, the process cost of the material is relatively high. The cost of preparing the battery will make the final unit energy storage cost higher.