Lithium iron phosphate batteries and ternary lithium battery which is better?

Source: 2020 - 04 - 10 transgress hits: lithium iron phosphate and ternary lithium battery which good? Test data comparison abstract: use the same battery structure, choice of different materials and lithium iron phosphate batteries ternary material and the condition of different power, charge and cycle test, the ternary material in charge, discharge rate and different temperature on the discharge performance advantages, and lithium iron phosphate material cycle performance better, 1 C cycle to keep more than 80% of the 5, 000 times the initial capacity. After 30 years of development, the lithium ion battery can than, than the power performance of had the very big enhancement. Limited by battery can than pure electric vehicle, a battery range is limited, is the bottleneck of restricting its development. Foreign car factory plans in the near future to develop a hybrid car. At present, lithium ion battery anode materials are mainly manganese acid lithium, lithium iron phosphate, cobalt acid lithium, ternary material. At present, the power type battery cathode mainly adopts the lithium iron phosphate and ternary material. In this paper, using the same battery shell, anode materials and internal structure design, respectively made lithium iron phosphate batteries and batteries ternary battery anode materials. Comparison of the two batteries can, or power, cycle, high and low temperature properties, comparative analysis of two kinds of battery performance difference. The experiment of 11. The selection of experimental materials is extremely ternary material ratio is 1:1: lithium iron phosphate and nickel cobalt manganese. Negative extremely MCMB. The electrolyte consists of EC, mixed solvent composed of PC, EMC, DEC. 1. 2 the preparation of porous membrane electrode and composite membrane electrode square aluminum shell LP2770102 inside the battery shell and cover the same multipolar lugs winding structure. Separately on the basis of the battery manufacturing technology has made the positive battery and lithium iron phosphate ternary positive cells. Get the average lithium iron phosphate battery capacity, internal resistance, the quality is 7. 2, 1. 06 Ω, 361 g; The average battery three yuan material, 1. 12 August. 6Ω,360 g。 1. Analysis and test 3 test conditions are as follows: three yuan battery charging and discharging voltage control range is 2. 5 - 4. 2v, 1 C = 7. 5 a, lithium iron phosphate battery charging and discharging voltage control range of 2. 0 - 3. 65 v, 1 C = 6。 5 ah, no special instructions, the test temperature is ( 25± 2) ℃. 2 the results and discussion. 1 discharge performance testing can be seen from table 1 and figure 1, the same volume of batteries ternary material discharge capacity is higher than the lithium iron phosphate material 19. 4%, higher than to 37. 5%, the discharge is higher than the power of 39. 7%. Due to the capacity and quality of the ternary materials compaction density were higher than the lithium iron phosphate material, so using the ternary material of battery discharge has great advantage. 2. From figure 2 and 2 charging performance comparisons are shown in table 2, the battery and lithium iron phosphate batteries ternary material no more than 10 C constant current charging capacity/total capacity than there were no significant differences, more than 10 C than charging, lithium iron phosphate battery constant current charge capacity/total capacity proportion is very small, the charge ratio, constant current charging capacity/total capacity ratio and cell gap, the greater the ternary material, the more obvious and lithium iron phosphate in the charged state is 30% ~ 80% voltage change smaller, if use a soft or hard carbon carbon cathode, lithium iron phosphate battery charging than performance enough to achieve three yuan. 2. 3 cycle performance comparison in figure 3, the ternary battery remaining capacity in 3 900 - cycle is 66%, the lithium iron phosphate battery remaining capacity in 5 000 - cycle is 84%. Three yuan batteries ternary is obviously better than the cycle life of battery and lithium iron phosphate batteries. According to the residual capacity / 80% of the initial capacity = end point, the ternary cell lab 1 c cycle life is about 2500 times now, lithium iron phosphate battery lab 1 c cycling life of more than 3500 times