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Battery.com.cn original: performance indicators and advantages and disadvantages of lithium titanate
Spinel Li4Ti5O12 is called "zero strain" material due to its small volume change during charge and discharge of lithium ion insertion and extraction. It has a very stable 1.5V (vs. Li) discharge platform and is high. The reduction potential of most electrolyte solvents does not form an SEI film, and the coulombic efficiency is high. Lithium titanate material has high safety. There is information that lithium titanate material has been listed as an ideal material for future electric vehicle batteries by the US Department of Energy. The quote from Toshiba Battery is that "the basic idea we take on the battery is the most." Safety is prioritized. Even if pressure is applied from the outside, the battery is crushed, or the metal sheet passes through the inside of the battery, and the battery will not rupture or catch fire."
From the last post reply, many people still don't understand the basic properties of lithium titanate materials. Here, the literature and the time-test experiments are combined to summarize the properties of lithium titanate materials. Under the first understanding of lithium, I have hoped to communicate more and solve problems together. The one sentence used in our forum is to help others and promote themselves.
The theoretical capacity of lithium titanate material is 175mAh/g, and the actual specific capacity is 150-160 mAh/g.
Lithium titanate materials have many advantages due to their structural characteristics:
1. Safety is good. The most important point of electric vehicle battery is the need for high safety. Because of its high equilibrium potential, lithium titanate does not form lithium dendrites in the negative electrode, and has good safety.
2. Good cycle performance, because it is a "zero strain" material, and will not undergo structural changes during charging and discharging, and has very superior cycle performance.
3. It can be quickly charged and discharged. The diffusion coefficient of lithium ion in lithium titanate crystal is 2×10-8cm-2/s, which is one order of magnitude more than graphite negative electrode. It can be charged and discharged quickly. The fast charging ability is to investigate the battery of electric vehicle. An important indicator.
4. The working temperature range is -30 °C-60 °C. The embedding and deintercalation ability of lithium will decrease at low temperature, especially the embedding ability. Lithium titanate negative electrode will not cause short circuit or deteriorate the negative electrode when it is charged at -30 °C. Lithium dendrite appears, which is not possible with graphite anodes. It can be quickly charged and discharged in a wide range of environments, and is suitable for automotive applications.
5. Self-discharge is small. In one post, we mentioned our experimental data. The positive electrode adopts our conventional lithium manganate and the negative electrode uses lithium titanate. The 60-degree storage capacity of the 28-day capacity is 88%, and the capacity recovery rate is over 95%.
At the same time, lithium titanate materials also have some disadvantages:
1. High lithium potential, resulting in low operating voltage and reduced energy density.
2. The battery production process is easy to produce gas.
3. Electronic conductivity is not good.
This article by the battery forum users manganese acid has lithium original article extracted from: Battery Forum (http://club.battery.com.cn) Detailed source please refer to: http://club.battery.com.cn/thread-127773-1 -1.html
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