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To count the advantages and disadvantages of lithium iron phosphate batteries

by:Vglory      2020-11-04
Lithium iron phosphate batteries, lithium iron phosphate lithium-ion battery, the full name of refers to the use of lithium iron phosphate as the anode material of lithium ion batteries. One, the main advantage of the lithium iron phosphate batteries: high security performance of lithium iron phosphate crystals in PO key stable and difficult to decompose. Even in the case of high temperature or charging, it will not collapse does not like cobalt acid lithium heat and form a strong oxidizing substances. The decomposition temperature of the lithium iron phosphate is about 600 ℃, thus has good security. Although in the case of excessive charge combustion and explosion would happen, but with the ordinary liquid electrolyte of lithium cobalt oxide cells and compared three yuan, overcharge of safety has been greatly improved. Long life cycle life of lead acid battery is about 300 times, is about 500 times the highest, while the lithium iron phosphate power battery cycle life over 2000 times, charging standards can be used 2000 times ( 0. 2 c, 5 hours) 。 The same quality of lead-acid battery is 'new half a year, half a year old, maintenance for half a year', up to 1 to 1. Five years, while the lithium iron phosphate batteries used in the same conditions, and the theory of life will reach seven to eight years. 。 Comprehensive consideration, the cost performance is theoretically lead-acid batteries more than four times. Large current discharge can be quickly for charging and discharging current 2 c. Use a dedicated charger, can be in 1. 5 c within 40 minutes after charging the battery fully charged. Starting current can reach 2 c, but there is no such lead-acid battery performance. Good high temperature performance of lithium iron phosphate, can reach 350 ℃ - electric heating peak 500 ℃, lithium cobalt and lithium manganese acid and acid only at about 200 ℃. Wide working temperature range, - 20 c to 75 c) With high temperature resistance, electric heating of the lithium iron phosphate peak can reach 350 ℃ 500 ℃, lithium cobalt and lithium manganese acid and acid only at about 200 ℃. It has a large capacity than ordinary cell ( Lead acid, etc. ) Greater capacity. From the battery capacity density, the energy density of the lead-acid battery is about 40 wh/kg. The market mainstream lithium iron phosphate lithium-ion battery energy density of more than 90 wh/kg. No memory effect rechargeable batteries are usually recharged and no discharge under the conditions of work, its capacity will quickly drop to below the rated capacity. This phenomenon is called memory effect. Like nickel-metal hydride and nickel cadmium battery, memory, but there is no this kind of phenomenon (lithium iron phosphate batteries Lithium ion batteries are usually no memory) 。 No matter in what state, can charge and use, without having to first to discharge it. Light weight specifications and capacity of the same volume of lithium iron phosphate batteries for two-thirds of lead-acid battery, 1/3 of the weight of lead acid battery, many times the energy density. Twice the lead-acid battery. Second, the shortcomings of the lithium iron phosphate battery: the lithium iron phosphate battery also has its disadvantages: for example, the low temperature performance is poor, low tap density of cathode material, and equal volume of lithium iron phosphate battery capacity is greater than the lithium cobalt acid lithium ion battery capacity, so there is no advantage in small batteries. When used for power battery, lithium iron phosphate batteries and other batteries, also need to face the battery consistency problem. The threat of elemental iron in sintering process in the process of preparation of lithium iron phosphate, can will iron iron oxide reduction to elements in high temperature and reducing atmosphere. Iron can lead to cell micro short circuit, which is the most taboo in the battery material. Japan is not the material will be used for the main reason of power type lithium ion battery cathode material. Performance defects of lithium iron phosphate has some defects, such as low tap density and compaction density, lead to low energy density of lithium-ion batteries. The low temperature performance is poor, even if it is nano and carbon coating, also cannot solve this problem. Lithium iron phosphate type lithium ion battery test results show that the lithium iron phosphate battery cannot make electric cars at low temperature ( Below 0 ° C) Under the road. Although some manufacturers claim that the lithium iron phosphate battery capacity retention under the low temperature is good, but it is smaller in the discharge current and discharge cut-off voltage is very low. In this case, the equipment is completely unable to get to work. High preparation cost of manufacturing cost of materials and battery manufacturing cost is relatively high, low battery production, and consistency. Although the lithium iron phosphate nano and carbon coating improved the electrochemical properties of materials, but it also brings other problems, such as energy density is reduced, synthetic cost increase, electrode processing performance is poor and the harsh environmental requirements. Although the lithium iron phosphate chemical elements in the Li, rich in Fe and P and the cost is low, but the preparation of lithium iron phosphate is not low the cost of the product. Even eliminates the cost of the previous research and development, materials processing cost is also higher. Prepare the cost of the battery will make the final energy storage costs are higher.
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