Advantages, disadvantages and prospect of lithium titanate batteries

Disadvantages of lithium titanate batteries:

High potential for lithium, resulting in low working voltage and lower energy density

2. Battery manufacturing process is easy to produce gas

3. Poor electron conductivity

Advantages of lithium titanate batteries:

Good safety, the most important point of electric vehicle batteries is the need for high safety, lithium titanate because of its high equilibrium potential, will not form lithium dendrites at the negative pole, and have good safety.

2. The recycling performance is good. Because it is a "zero-strain" material, it does not change the structure during the charging and discharging process and has very superior recycling performance.

3. It can be quickly charged and discharged. The diffusion coefficient of lithium ions in lithium titanate crystals is 2 × 10-8cm-2 / S, which is an order of magnitude more than the negative electrode of graphite. It can be quickly charged and discharged. The rapid charging ability is an examination of electric vehicle batteries. An important indicator.

4. The operating temperature range is -30 °C -60 °C. At low temperatures, the embedding and removal capabilities of lithium will be reduced, especially the embedding capabilities. Lithium dendrites that cause short circuit or deterioration of negative poles will not appear when charged at -30 °C. appear, This is the graphite negative pole can not do, in a wide range of environments can quickly charge and discharge, suitable for vehicle use.

5. Since the discharge is small, we mentioned our experimental data in a post. The positive pole uses our conventional lithium manganate, the negative electrode uses lithium titanate, and the 60-degree storage has a 28-day capacity surplus of 88 %, and the capacity recovery rate is 95 % or more.

Disadvantages of Lithium Titanium Battery: Introduction of Disadvantages

1. High potential for lithium, resulting in low working voltage and lower energy density

2. Battery manufacturing process is easy to produce gas

3. Poor electron conductivity

Disadvantages of Lithium Titanium Battery: An Introduction to Advantages

1. The safety is good. The most important point for electric vehicle batteries is the need for high safety. Lithium titanate has a high balance potential and will not form lithium dendrites at the negative pole and has good safety.

2. The recycling performance is good. Because it is a "zero-strain" material, it does not change the structure during the charging and discharging process and has very superior recycling performance.

3. It can be quickly charged and discharged. The diffusion coefficient of lithium ions in lithium titanate crystals is 2 × 10-8cm-2 / S, which is an order of magnitude more than the negative electrode of graphite. It can be quickly charged and discharged. The rapid charging ability is an examination of electric vehicle batteries. An important indicator.

4. The operating temperature range is -30 °C -60 °C. At low temperatures, the embedding and removal capabilities of lithium will be reduced, especially the embedding capabilities. Lithium dendrites that cause short circuit or deterioration of negative poles will not appear when charged at -30 °C. appear, This is the graphite negative pole can not do, in a wide range of environments can quickly charge and discharge, suitable for vehicle use.

5. Since the discharge is small, we mentioned our experimental data in a post. The positive pole uses our conventional lithium manganate, the negative electrode uses lithium titanate, and the 60-degree storage has a 28-day capacity surplus of 88 %, and the capacity recovery rate is 95 % or more.

Lithium titanate batteries have the characteristics of small size, light weight, high energy density, good sealing performance, no leakage, no memory effect, low self-discharge rate, rapid charging and discharging, long cycle life, wide operating temperature range, safety, stability, green and environmental protection, etc.. Therefore, it has a wide range of applications in the field of communication power supply.

When lithium titanate is used as a negative electrode material, the potential platform is as high as 1.55 V, which is more than the traditional graphite negative material Gaochu 1V. Although some energy density is lost, it also means that the battery is safer. Technical expert Lulanguang has said that the demand for negative voltage is relatively low when the battery is charged quickly, but if it is too low, lithium batteries can easily precipitate very lively metallic lithium, which not only conducts electricity, but also reacts with electrolytic liquids., and then release heat, Produces combustible gases and causes fires. The high 1V voltage of lithium titanate avoids the negative voltage of 0, which indirectly avoids the precipitation of lithium ions, thus ensuring the safety of the battery.

Since lithium titanate batteries can be used safely at high and low temperatures, they also reflect their important advantages of wide temperature(especially low temperature). At present, the safe operating temperature area of the lithium titanate battery is between -50 and 65 degrees, while the energy of the ordinary graphite negative battery begins to decay when the temperature is below -20 degrees, and the charging capacity is only at -30 degrees. 14 % of the total charging capacity, Can't work properly in the cold weather. In addition, because lithium titanate batteries, even if overcharged, have only 1 % volume change, known as zero-strain material, which gives them a very long life. Weiyincang, chairman of Yinlong, once stated that the battery life of Yinlong lithium titanate can reach 30 years, which is equivalent to the service life of a car, while the average life expectancy of an ordinary graphite negative material battery is only 3-4 years. Lithium titanate batteries are less expensive in terms of life cycle.

The last advantage of lithium titanate is that it has a strong rapid charging and discharging ability and a high charging rate. At present, the charging ratio of the silver lithium titanate battery is 10C or even 20C, while the battery charging rate of the ordinary graphite negative electrode material is only 2C-4C. Based on these technical characteristics of lithium titanate batteries, the industry believes that it meets the needs of new energy buses and large-scale energy storage equipment.

Replacing fuel vehicles with electric vehicles is the best choice to solve urban environmental pollution. Lithium-ion power batteries have attracted widespread attention. In order to meet the demands of electric vehicles on the on-board ion power cells, the development of negative electrode materials with high safety, high ratio performance and long life is a hot and difficult point.

The commercial lithium ion battery negative electrode mainly uses carbon materials, but there are still some disadvantages in the application of lithium batteries with carbon as the negative electrode:

1, it is easy to precipitate lithium dendrites when overcharging, causing a short circuit in the battery, affecting the safety performance of lithium batteries;

2, easy to form SEI membrane, resulting in lower charging and discharging efficiency for the first time, and large irreversible capacity;

3, that is, the platform voltage of the carbon material is low(close to metallic lithium), and it is easy to cause the decomposition of the electrolyte, which brings about safety risks.

4, in the process of lithium-ion embedding, extraction volume change is large, the cycle stability is poor.

Compared with carbon materials, spinel type Li4TI5O12 has obvious advantages:

1, it is a zero-strain material, good recycling performance;

2, the discharge voltage is stable, and the electrolyte does not decompose, improving the safety performance of lithium batteries;

3, compared with carbon negative electrode materials, lithium titanate has a high lithium ion diffusion coefficient(2 * 10-8cm2 / s), and can be charged and discharged at high magnification.

4, lithium titanate has a higher potential than pure metal lithium, and it is not easy to produce lithium crystal branches, which provides a basis for ensuring the safety of lithium batteries.

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