Lithium titanate battery can solve the problem of safe quick charge

Lithium titanate is considered as a safer and longer life anode material than carbon, and its prospect is favored by many enterprises. Many domestic enterprises have invested in the development and manufacturing of lithium titanate energy storage products, such as Shanghai electric and zhengdao group. Others, such as jinlu, put money into lithium titanate storage and frequency modulation plants. For a time, lithium titanate has become a hot topic in energy storage industry.

Lithium titanate battery has a broad application prospect

Dong mingzhu, chairman and President of Gree Electric Appliances,Inc. Of Zhuhai, is very bullish on lithium titanate technology. She pointed out that the energy storage advantages of lithium titanate batteries could not only be applied in the new energy vehicle market, but also have considerable application prospects in the smart home layout.

Due to the characteristics of high safety, high stability, long life and green environmental protection of lithium titanate battery, lithium titanate material will become the negative material of the new generation lithium ion battery and be widely used in new energy vehicles, electric motorcycles and projects requiring high stability and long cycle. A third party has conducted tests on lithium titanate batteries and found that they are far safer than other lithium batteries because they do not emit smoke, catch fire or explode under harsh tests such as acupuncture, extrusion and short circuit. Therefore, many people in the industry believe that lithium titanate is very suitable for the military and other fields that require high stability of the battery.

In recent years, the technology and performance of domestic lithium titanate batteries have been continuously improved. Although lithium titanate is still a new material, a number of companies have been engaged in related industries and realized the localization of lithium titanate batteries. For example, zhuhai yinlong new energy co., LTD. (" yinlong "for short), after acquiring American ati nano technology co., LTD., applied its technology to the production of lithium titanate batteries for electric buses and energy storage systems, with an annual output of 3,000 tons.

It is known that the United States titanium nanotech company in lithium titanate battery has its unique core technology. The 10-ampere high-power lithium battery developed takes lithium cobalt oxide as the positive electrode, and its excellent low-temperature discharge performance enables the battery to discharge more than 60% of its capacity at the low temperature of minus 40 degrees Celsius. The battery is also highly thermal-stable, and does not ignite or explode even if it is left unheated for 30 minutes at 240 degrees Celsius. In California, the hybrid bus with the lithium titanate battery has been well received.

In addition, domestic suppliers of lithium titanate batteries include sichuan xingneng new materials co., LTD., whose products are mainly sold to Europe to supply local electric buses. Shenzhen beitui new energy materials co., ltd. has made great efforts in materials. Its carbon-coated lithium titanate and carbon-free carbon-coated lithium titanate materials are also widely sold in China.

The lithium titanate battery will become the next development trend when the carbon anode meets the development bottleneck and the silicon and tin anode materials do not produce enough energy. Industry insiders point out that the advantages of lithium titanate batteries may become more obvious with the wide range of charging devices.

As a cathode material has advantages

The safety and stability performance of electric vehicles is the index that consumers pay the most attention to, and the battery cycle life determines the cost performance of the whole new energy vehicles, which is the main competition point after the new energy vehicles are separated from the subsidy policy in the future. Today's new energy vehicles are mostly equipped with batteries that are not easily disassembled, making battery choice particularly important -- not only in terms of whether they will catch fire or explode while driving, but also in terms of how long the battery will last.

When the battery is charged and discharged, lithium ions can be embedded and unembedded in the negative electrode of lithium titanate without affecting its stable structure. The crystal structure of lithium titanate has almost no change, which is called "zero strain". Therefore, lithium titanate material is also called "zero strain material". This property plays an important role in electrode materials. Traditional graphene, due to its layered structure, will cause material deformation during lithium ion embedding and embedding process, resulting in insufficient cycling performance. However, other traditional lithium ion batteries, such as lithium iron phosphate batteries, will have the problems of large capacity attenuation and shortened life in the use process, which not only affects the normal use of users, but also increases the cost of battery replacement.

Lithium titanate batteries solve this problem well. Its "zero strain" property can avoid the change of structure caused by the expansion and contraction of the material in the process of charging and discharging, so as to improve the performance of the electrode and reduce the substantial attenuation of specific capacity and greatly improve the cycle life of the battery.

According to relevant test data, the average cycle life of ordinary batteries is 3,000 times, while the total charge and discharge cycles of lithium titanate batteries can reach more than 30,000 times. After being used as a power battery for 10 years, it can be used as a storage battery for another 20 years. This also means that the life cycle of the lithium titanate battery can be the same as that of the vehicle, users do not need to replace the battery in the actual use process, and almost do not increase the later cost.

Due to the potential problem of conventional graphite negative battery, a layer of film will be formed on the interface of electrolyte, and "lithium dendrite" is easily formed, which will affect the safety of battery. And compared with the carbon anode materials for lithium titanate of potential higher than metallic lithium 1.55 v, low reactivity, between the electrolyte and the result is often in the electrolyte with carbon negative electrode is formed on the surface of the membrane on the surface of lithium titanate basic formation, so as to avoid the phenomenon of lithium dendrite, greatly improve the stability and safety of the battery.

In addition, the performance of lithium titanate battery in high and low temperature performance is also very good. Generally, electric cars will have problems when charging and discharging at -10c, while lithium titanate batteries have good performance of wide temperature resistance and strong durability, and their performance is still maintained at normal temperature within the range of -50c to 60c.

It is worth noting that compared with carbon anode materials, lithium titanate has a higher lithium ion diffusion coefficient and can be charged and discharged at a high rate. Taking too long to charge has long been a hurdle for electric cars, and many consumers say they don't want to spend too much time waiting for charging. Relevant tests show that compared with traditional graphite batteries, the charging time of 2~4 hours will be shortened to 6 minutes by lithium titanate batteries at the same capacity, and the charging and discharging rate will be improved by more than 10 times.

At present, although lithium titanate battery has some controversy, because it is only used as a negative electrode material, and cannot determine the other performance of the battery, not to mention its low energy density, high cost of competitive disadvantage, but it is undeniable that its advantage also points to the pain point of other types of power battery in the market today. With the improvement of productivity of domestic enterprises and the increase of research and development efforts on lithium titanate battery, it is believed that most of the cost and technical problems can be solved in the future, and the requirement on its energy density will be reduced as the charging pile is covered in a wide range. The industry is still full of expectations for it.

It is known that the cost of the fourth-generation high-energy density lithium titanate battery independently developed by yinlong is 40% lower than that of the third-generation, and the energy density is 60% higher. In the future, yinlong will solve the problem of short range of new energy vehicles through the combination of lithium titanate battery and fuel cell.

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