The use of electric vehicles instead of fuel vehicles is the best choice to solve urban environmental pollution. Among them, lithium-ion power batteries have attracted wide attention from researchers. In order to meet the requirements of electric vehicles for on-board knap ion power batteries, the development of high safety and good rate performance And the long-life negative electrode material is its hot and difficult point.
Currently, commercial lithium-ion battery negative electrodes mainly use carbon materials, but lithium batteries using carbon as negative electrodes still have some drawbacks in their applications:
1. Lithium dendrites are easy to precipitate during overcharging, which will cause short circuit of the battery and affect the safety performance of the lithium battery;
2. It is easy to form SEI film, which results in low first charge and discharge efficiency and large irreversible capacity;
3. That is, the platform voltage of carbon materials is low (close to metal lithium), and it is easy to cause the decomposition of the electrolyte, which brings safety risks.
4. The volume changes greatly in the process of lithium ion insertion and extraction, and the cycle stability is poor. Compared with carbon materials, spinel-type
Li4Ti5012 has obvious advantages:
1. It is a zero-strain material with good cycle performance;
2. The discharge voltage is stable, and the electrolyte is not decomposed, which improves the safety performance of lithium batteries;
3. Compared with carbon anode materials, lithium titanate has a high lithium ion diffusion coefficient (2*10-8cm2/s), and can be charged and discharged at a high rate.
4. The potential of lithium titanate is higher than that of pure metal lithium, and it is not easy to produce lithium crystal branches, which provides a basis for ensuring the safety of lithium batteries.
APPLICATION:
For electric vehicles Agricultural equipment Robot equipment electric wheelchair Fishing equipment Solar energy storage Traffic equipment, street lights AGV trolley Fascia Gun Battery