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Tramway News: Today, CATL officially announced sodium ion batteries. Zeng Yuqun said, "Sodium ion batteries have unique advantages in low-temperature performance, fast charging, and environmental adaptability, and are compatible and complementary to lithium batteries. Therefore, diversified technological routes are also an important guarantee for the long-term stable development of our industry.

The first generation sodium ion batteries developed by CATL have the following important performance indicators:

The energy density of the single cell has reached 160Wh/kg,

Charging at room temperature for 15 minutes can reach 80% of the battery capacity,

At a low temperature of -20 ° C, there is a discharge retention rate of over 90%,

In terms of system integration efficiency, it can reach over 80%.

Dr. Huang Qisen, Vice President of CATL Research Institute, stated that sodium ion batteries have exceeded the safety requirements of the national strong standard for lithium batteries in terms of thermal stability.

In general, the energy density of the first generation sodium ion battery is slightly lower than that of the current lithium iron phosphate battery, but it has obvious advantages in low temperature performance and fast charging, especially in high power application scenarios in cold regions.

In addition, in terms of battery system integration, CATL has also developed a solution for AB batteries, which can achieve integrated hybrid sharing with lithium batteries.

Integrating sodium ion batteries and lithium batteries into the same battery system at the same time, mixing, series connection, parallel connection, and integration of the two types of batteries in a certain proportion and arrangement, and balancing control of different battery systems through the precise algorithm of BMS, can achieve complementary advantages, not only filling the energy density gap of sodium ion batteries at the current stage, but also leveraging its advantages of high power and low temperature performance. This lithium-sodium battery system can adapt to more application scenarios.

Huang Qisen introduced that the chemical properties of sodium and the working principle of batteries are very similar to lithium. It belongs to the same main group in the periodic table of elements, and the working principle of batteries is a rocking chair type. The crustal element content of sodium ranks sixth, which means its resources are very abundant. Compared to the compact lithium ion, sodium ion is a big fat person, and it is even larger. This means that during the operation of the battery, the insertion and removal of sodium ions in the material put forward higher requirements for the structural stability and dynamics of the material.

In terms of positive electrode materials for sodium ion batteries, there are currently two types of materials with potential commercial value: Prussian white and layered oxide. Their gram capacity has reached 160mAh/g, which is equivalent to existing lithium battery positive electrode materials.

CATL has built a high-throughput material integrated computing platform that can simulate and design materials at the atomic level. On the basis of previous research, CATL rearranged the charge structure of the material's bulk phase and redesigned the material surface, solving the global problem of rapid capacity decay during the cycling process, and enabling innovative materials to have the conditions for industrialization.

In terms of negative electrode materials, due to the inability of sodium ions to shuttle freely between graphite layers like lithium ions, CATL has developed a hard carbon material with a unique pore structure that can store and quickly pass a large amount of sodium ions. This hard carbon material has a capacity of over 350mAh/g and excellent cycling performance. The overall performance index is comparable to existing graphite.

In terms of electrolyte, CATL has developed a new unique electrolyte system that is compatible with such positive and negative electrode materials, and can be compatible with current lithium battery manufacturing processes and equipment in terms of manufacturing process.

Huang Qisen stated that the energy density of CATL's next generation sodium ion batteries will exceed 200Wh/kg. Entering the TWh era, just like lithium batteries 30 years ago, sodium ion batteries will open up a new commercial battery route, deploy innovation chains around the industrial chain, and lay out the industrial chain around the innovation chain. CATL has already begun the industrial layout of sodium ion batteries, and plans to form a basic industrial chain by 2023.

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