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release time:2024-07-05 Hits: Popular:AG11 battery
In the era of CR1632 battery, we can see the research and development results of new electrolytes of Xinzhoubang and Tianci Materials
Electrolyte is one of the four main materials of battery materials, and the cost of electrolyte accounts for about 5%-10% of the cost of lithium batteries. It is estimated that the installed capacity of batteries in 2018 is expected to be 117GWh, the demand for electrolyte is 151,400 tons, and the market space is 6.6 billion yuan. By 2020, the installed capacity of batteries is expected to be 228GWh, the demand for electrolyte is 303,500 tons, and the market space is 11.2 billion yuan.
The electrolyte has a relatively important impact on the performance of the battery, especially some functional additives, which have a relatively strong complementary effect on the improvement of capacity density and power density, high and low temperature performance, cycle life, and safety performance.
In line with the subsidy policy and the market demand for high energy density of batteries, CR1632 battery have exploded. From January to August 2018, my country's cumulative output of power batteries reached 38.52GWh, of which ternary batteries produced a total of 20.12GWh, accounting for 52.23% of the total output; lithium iron phosphate batteries produced a total of 17.78GWh, accounting for 46.17% of the total output. Ternary batteries exceed lithium iron phosphate and occupy a dominant position. In the high-nickel system, battery cell manufacturers have greatly increased the requirements for electrolyte upgrades, which are mainly reflected in the use of new additives and electrolyte formulas.
New additives: For high-nickel systems, it is necessary to solve the problems of gas production on the positive electrode surface, film formation stability and safety of the negative electrode. New additives can solve the problems encountered by high nickel in a targeted manner. Electrolyte companies with the ability to develop new additives will benefit significantly.
Electrolyte formula: The electrolyte formula development cycle is long and the cost is high. It is currently one of the links with the highest barriers for battery companies. As the division of labor in the industry expands, the focus of development will tilt towards electrolyte manufacturers, who have greater advantages in formula development and additive research and development.
Xinzhoubang's new negative electrode film-forming additive LDY269 and lithium salt additive SCT97
It is understood that in ternary material power batteries, the two most commonly used classic additives are VC and PS, which can significantly improve the high-temperature storage performance and cycle performance of the battery, but the biggest defect is that it will significantly increase the impedance, reduce power and low-temperature performance. In response to this situation, Xinzhoubang has developed a new low-impedance negative electrode film-forming additive LDY269 and lithium salt additive SCT97.
The new negative electrode film-forming additive LDY269 is characterized by a reduction in interfacial impedance when forming a film on the negative electrode, and will not increase the interfacial impedance of the negative electrode like VC. The lithium salt additive SCT97 can significantly reduce the internal resistance of the battery, improve low-temperature performance, and significantly improve high-temperature storage performance. When used in batteries with NMC532 as the positive electrode, the effect of SCT97 is significantly better than that of PS. When LDY269 is combined with SCT97, better results can be obtained than the VC combination. Not only is the impedance lower, but the high-temperature storage performance is also better, especially when charging at 0℃, there will be no obvious lithium precipitation like the VC combination.
Tianci Materials DTD, lithium difluorophosphate, LIFSI and other electrolyte additives
Tianci Materials said that the advantages of the electrolyte additives produced by the company in the field of high-nickel ternary materials are mainly in the high level of high and low temperature. It can effectively inhibit gas production at high temperatures and maintain low impedance at the same time, thus not affecting low-temperature performance. The products mainly include DTD, lithium difluorophosphate, LIFSI, etc.
Tianci Materials develops LiFSI with better chemical stability as a functional additive, and even partially replaces lithium hexafluorophosphate as the main solute to improve the high-temperature resistance of the electrolyte and improve the performance of the solid electrolyte interface film on the surface of the graphite negative electrode, especially inhibiting the generation of hydrogen fluoride, thereby achieving the improvement of key battery performance, including cycle life, rate performance and safety, which is one of the development directions of electrolyte technology in recent years.
As the industry price war tends to ease, the market share of core enterprises in the industry is consolidated, and the market structure gradually becomes clear, the fluctuation of electrolyte prices in the future market will be mainly affected by cost fluctuations, and the difference in industry profitability will come from the technology premium. The technology premium comes from the advantages of additives and formulas, which is reflected in the better performance of products. Look at it from two angles: 1) Consumer VS power. Consumer batteries generally have higher voltages and stronger differences. The price of consumer electrolytes is generally 10% higher than that of power batteries; and the development of power batteries towards high-nickel and high-voltage platforms also requires electrolyte additives to protect materials such as the positive electrode, which also means better profit margins. 2) Domestic orders VS foreign orders. Overseas orders have higher requirements and better prices, and the first entrants will gain a better position.
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