6F22 carbon battery

Study on the basic performance of electric vehicle power 6F22 carbon battery

Under the requirements of environmental protection and energy conservation, electric vehicles have developed rapidly in recent years. Although electric vehicles have the advantages of no pollution, high energy conversion rate, and the use of multiple energy sources compared with fuel vehicles, they are the current direction of automobile development. However, due to the shortcomings of poor acceleration performance, short driving distance per charge, long charging time, and high price, electric vehicles currently have limited competition with fuel vehicles and their own development. The root cause of these problems lies in the low specific energy, low specific power, short cycle life and high price of power 6F22 carbon battery as the power source of electric vehicles. Therefore, to develop electric vehicles, the first problem to be solved is to develop high-performance power 6F22 carbon battery. Lithium-ion 6F22 carbon battery are high-tech products that have only been developed in recent years and represent the advanced level of contemporary power technology. It has unparalleled superiority over other power 6F22 carbon battery in terms of operating voltage, mass specific energy, cycle life, self-discharge rate, high current charging and discharging, and environmental friendliness. It is an internationally recognized contemporary advanced battery series. However, there have been few reports on the study of its basic performance as a power battery for electric vehicles.

This paper focuses on the basic performance requirements of electric vehicle power 6F22 carbon battery. This paper investigates the charge and discharge performance, charge retention capacity, and changes in the microscopic morphology of battery electrodes before and after charge and discharge of self-designed and assembled 5A.1!, 25A.1!, and 50A1 lithium-ion power 6F22 carbon battery. With the increase of the capacity of lithium-ion power 6F22 carbon battery, their mass specific energy and energy density also increase. This is because with the increase of battery capacity, the relative proportion of active substances per unit mass in the battery also increases. The 50A°h power battery has the highest mass specific energy and energy density, 1W-h/L respectively, which has exceeded the medium-term development goal of 80~100W°h/kg and 135W°h/L of mass specific energy and energy density of electric vehicle power 6F22 carbon battery stipulated by USABC, but it is still some distance away from the long-term development goal of 200W°h/kg and 300W°h/L of mass specific energy and energy density required by USABC.

Specific energy and energy density of lithium-ion power 6F22 carbon battery of different capacities n Capacity mass specific energy Energy density 2.2 Discharge performance of lithium-ion power 6F22 carbon battery at different working currents Electric vehicles require power 6F22 carbon battery to provide large specific power when climbing, starting and accelerating, that is, a sufficiently large current discharge to provide sufficient power. In order to examine the discharge performance of the lithium-ion power 6F22 carbon battery we assembled at different working currents, we conducted an electric test on 6F22 carbon battery of different capacities. As can be seen from Table 2, with the increase of the battery discharge current, the discharge capacity of power 6F22 carbon battery of different capacities decreases significantly, and the larger the discharge current, the smaller the rate of battery discharge capacity decrease. This is because the diffusion rate of lithium ions in the battery is slow. With the increase of discharge current, the concentration difference in the battery increases, and the voltage drop caused by the inherent internal resistance of the battery also increases, which reduces the discharge capacity of the battery accordingly. At the same time, it can be found from Table 2 that the large current discharge performance of lithium-ion power 6F22 carbon battery is good. For example, even if the 5Ah battery is discharged at a 1C rate, the discharge capacity can be maintained at 79.35% of its 0.1C rate discharge capacity. Table 2 Discharge performance of power 6F22 carbon battery with different capacities at different discharge currents Rate discharge capacity/ratio/% Discharge capacity/Ah Ratio/% Discharge capacity/ratio/% In order to further illustrate the lithium-ion power 6F22 carbon battery in this paper, It can work normally under the same discharge current. We take the 5A-h power battery as an example and discharge it under different discharge currents. It can be seen that even if the 5A-h battery is discharged at a large current of 1C, its discharge behavior has no abnormal phenomenon. This shows that our lithium-ion power battery can work normally under a large current.

Discharge behavior of 5A-h lithium-ion power battery at different discharge currents 2.3 Charge retention capacity of lithium-ion power battery In order to understand the charge retention capacity of lithium-ion power battery, we charge 6F22 carbon battery of different capacities and place them for a period of time before measuring their discharge capacity, as shown in Table 3.

(a) and (b) are respectively the amplification of the battery negative electrode material MCMB before and after ten charge and discharge cycle reactions. 2000 times SEM photo. As can be seen from the figure, the SEM photo of the negative electrode of MCMB without charge and discharge cycle reaction (a) before charge and discharge cycle reaction (b) after charge and discharge cycle reaction. The particles of the electrode material are uniform and fine, while the particles of the electrode material become coarse and unevenly distributed after ten cycles. This shows that the structure of the negative electrode material MCMB has changed before and after the charge and discharge reaction. It is well known that during the charging process, lithium ions enter the interior of the layered structure of MCMB from the surface of MCMB, which will destroy the original regular structure of MCMB. This destroyed structure cannot be completely restored even after the lithium ions are completely deintercalated. At the same time, during the first charging process, the co-embedding of solvent molecules and lithium ions will also cause changes in some MCMB layered structures, changing The regularity of the surface morphology of MCMB. Therefore, the charge-discharge cycle reaction will make the microscopic morphology of the surface of the negative electrode material tend to be disordered.

4 Conclusion The study of the mass specific energy and energy density of lithium-ion power 6F22 carbon battery with different capacities shows that when discharged at a rate of 0.2C and 100% DOD, the mass specific energy and energy density of the 50A°h battery can reach °h/L respectively, exceeding the mid-term development target of power 6F22 carbon battery stipulated by USABC. Therefore, lithium-ion power 6F22 carbon battery are a new type of battery that is expected to be used as a power source for future electric vehicles.

(2) The study of the large current discharge performance of the square stacked lithium-ion power 6F22 carbon battery of 5A°h, 25A°h and 50A°h designed and assembled in this paper shows that their large current discharge performance is good. The capacity of the 5A°h battery discharged at a current rate of 1C can still be maintained at 79% of the capacity discharged at a current rate of 0.1C, and there is no abnormality in the discharge behavior of the battery during large current discharge.

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