Lithium titanate battery

by:CTECHi     2021-07-21

Lithium titanate, a negative electrode material for lithium-ion batteries, can be combined with lithium manganate, ternary materials or lithium iron phosphate to form 2.4V or 1.9V lithium ion secondary batteries. In addition, it can also be used as a positive electrode to form a 1.5V lithium secondary battery with metallic lithium or lithium alloy negative electrode. Due to the high safety, high stability, long life and environmental protection characteristics of lithium titanate, it is foreseeable that after 2-3 years, lithium titanate will become the negative electrode material of a new generation of lithium-ion batteries and be widely used In new energy vehicles, electric motorcycles and applications requiring high safety, high stability and long cycle. The lithium titanate battery has a working voltage of 2.4V, a maximum voltage of 3.0V, and a charging current greater than 2C. Commercial lithium-ion battery negative electrodes mainly use carbon materials, but lithium batteries using carbon as negative electrodes still have some drawbacks in application: 1. Lithium dendrites are easy to precipitate during overcharging, causing battery short circuits and affecting the safety performance of lithium batteries. 2. It is easy to form SEI film, which leads to 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 hazards. 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 Li4Ti5O12 (lithium titanate) has obvious advantages: 1. It is a zero-strain material with good cycle performance. 2. The discharge voltage is stable, and the electrolyte will not be 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 dendrites, which provides a basis for ensuring the safety of lithium batteries.

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