High-energy lithium iron phosphate battery doped with graphene

Abstract

The invention discloses a high-energy lithium iron phosphate battery doped with graphene. Raw materials of the high-energy lithium iron phosphate battery comprise a positive electrode active material adopting lithium iron phosphate, lithium manganate or lithium manganese iron phosphate and a negative electrode active material adopting graphene, the specific capacity of the positive electrode active material is 170-190 mAh / g, the initial efficiency is 98.8%-99.6%, the double-sided area density is 11-55 mg / cm<2>, and the positive electrode compaction density is 1.7-2.8 g / cm<2>. The specific capacity of graphene is 355-365 mAh / g, the negative electrode compaction density is 1.2-1.99 g / cm<2>, and the negative electrode area density is calculated according to the condition that the excess ratio of the corresponding positive electrode active material is 5%-30%. The high-energy lithium iron phosphate battery has the advantages of stable safety, high durability, small size, high charging speed, durability and long endurance; the electric energy is improved through improvement of tap density; the electric energy is improved by adding graphene to the positive electrode material, and compared with batteries in the like industry, the battery in the same size is more durable by higher than 20%.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a graphene-doped high-energy lithium iron phosphate battery. Background technique [0002] A lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. It is different from a rechargeable battery. Lithium-ion batteries are different from lithium-ion polymer batteries. The inventor of the lithium battery is Edison. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology at the end of the 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements for power supply. Lithium batteries have entered a large-scale practical stage. [0003] With the ...

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate itself has poor conductivity, and the slow diffusion of lithium ions causes the disadvantages of low actual specific capacity, slow charging rate, and short endurance when the battery is charged and discharged at a high rate.