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What are the advantages and disadvantages of lithium iron phosphate battery cathodes

by:Vglory      2021-05-10
Advantages of lithium iron phosphate battery cathode 1. High energy density: its theoretical specific capacity is 170mAh/g, and the actual specific capacity of the product can exceed 140mAh/g (0.2C, 25°C); 2. Safe and pollution-free: it is currently the safest Lithium battery cathode material; does not contain any heavy metal elements harmful to the human body; it complies with European RoHS regulations and is an absolute green battery certificate; 3. Long life: under 100% DOD conditions, it can be charged and discharged more than 2000 times; iron phosphate The service life of a lithium battery is closely related to its use temperature. If the use temperature is too low or too high, there will be great hidden dangers in the charging and discharging process and use process; 4. Charging performance: The lithium battery with lithium iron phosphate cathode material can be used at a large rate Charging, the battery can be overflowed within 1 hour at the fastest; 5. Light weight: the volume of the lithium iron phosphate battery of the same specification and capacity is 2/3 of the volume of the lead-acid battery, and the weight is 1/3 of the lead-acid battery; iron phosphate Disadvantages of lithium battery cathode materials Of course, whether a material has the potential for use and development, in addition to paying attention to its advantages, whether the material has fundamental defects is also crucial. At present, lithium iron phosphate is widely selected as the cathode material of power lithium batteries. The government, scientific research institutions, companies and even securities companies are all optimistic about this material and regard it as the development direction of power lithium batteries. There are two important points to decompose the reason: First, it is influenced by the direction of research and development in the United States. Valence and A123 in the United States first adopted lithium iron phosphate as the cathode material for lithium batteries. Secondly, there has not been a lithium manganate material with good high-temperature cycling and storage performance that can be used in power-type lithium batteries in China. However, lithium iron phosphate also has fundamental defects that cannot be ignored, which boil down to the following two points: 1. Poor conductivity. This issue is its most critical issue. The reason why lithium iron phosphate batteries have not been widely used is an important issue. However, this problem can now be perfectly dealt with: it is to add C or other conductive agents. The laboratory reports that it can reach a specific capacity above 160mAh/g. 2. The tap density is low. Generally, it can only reach 1.3-1.5g/ml, and the low tap density can be said to be the biggest disadvantage of lithium iron phosphate. This shortcoming determines that it has no advantages in small batteries such as mobile phone batteries. Even though it has low cost, good safety performance, good stability, and high cycle times, if it is too large, it can only replace lithium cobalt oxide in a small amount. This shortcoming will not be prominent in power lithium-ion batteries. Therefore, lithium iron phosphate is mainly used to make power lithium-ion batteries. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Talking about the recycling value of lithium batteries
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