At present, lithium ion batteries have played an increasingly important role in people’s lives, but there are still some problems in lithium battery technology. The main reason is that the electrolyte used in lithium batteries is lithium hexafluorophosphate, which is very sensitive to moisture and has high temperature performance. Instability and decomposition products are corrosive to electrode materials, resulting in poor safety performance of lithium batteries. At the same time, LiPF6 also has problems such as poor solubility and low conductivity in low temperature environments, which cannot meet the use of power lithium batteries. Therefore, it is very important to develop new electrolyte lithium salts with excellent performance.
So far, research institutions have developed a variety of new electrolyte lithium salts, the more representative ones are lithium tetrafluoroborate and lithium bis-oxalate borate. Among them, lithium bis-oxalate borate is not easy to decompose at high temperature, insensitive to moisture, simple synthesis process, no It has the advantages of pollution, electrochemical stability, wide window, and the ability to form a good SEI film on the surface of the negative electrode, but the low solubility of the electrolyte in linear carbonate solvents leads to its low conductivity, especially its low temperature performance. After research, it was found that lithium tetrafluoroborate has a large solubility in carbonate solvents due to its small molecular size, which can effectively improve the low-temperature performance of lithium batteries, but it cannot form an SEI film on the surface of the negative electrode. The electrolyte lithium salt lithium difluorooxalate borate, according to its structural characteristics, lithium difluorooxalate borate combines the advantages of lithium tetrafluoroborate and lithium bis-oxalate borate in structure and performance, not only in linear carbonate solvents. At the same time, it can reduce the viscosity of the electrolyte and increase the conductivity, thereby further improving the low temperature performance and rate performance of lithium ion batteries. Lithium difluorooxalate borate can also form a layer of structural properties on the surface of the negative electrode like lithium bisoxalate borate. A good SEI film is bigger.
Vinyl sulfate, another non-lithium salt additive, is also a SEI film-forming additive, which can inhibit the decrease of the initial capacity of the battery, increase the initial discharge capacity, reduce the expansion of the battery after being placed at high temperature, and improve the charge-discharge performance of the battery, that is, the number of cycles. . Thereby extending the high endurance of the battery and prolonging the service life of the battery. Therefore, the development prospects of electrolyte additives are getting more and more attention, and the market demand is increasing.
According to the “Industrial Structure Adjustment Guidance Catalogue (2019 Edition)”, the electrolyte additives of this project are in line with the first part of the encouragement category, Article 5 (new energy), point 16 “development and application of mobile new energy technology”, Article 11 (Petrochemical chemical industry) point 12 “modified, water-based adhesives and new hot melt adhesives, environmentally friendly water absorbents, water treatment agents, molecular sieve solid mercury, mercury-free and other new efficient and environmentally friendly catalysts and additives, nanomaterials, Development and production of functional membrane materials, ultra-clean and high-purity reagents, photoresists, electronic gases, high-performance liquid crystal materials and other new fine chemicals; According to the review and analysis of national and local industrial policy documents such as the “Notice on the Negative List Guidelines for Economic Belt Development (for Trial Implementation)” (Changjiang Office Document No. 89), it is determined that this project is not a restricted or prohibited development project.
The energy used when the project reaches production capacity includes electricity, steam and water. At present, the project adopts the industry’s advanced production technology and equipment, and adopts various energy-saving measures. After being put into use, all energy consumption indicators have reached the advanced level in the same industry in China, and are in line with national and industry energy-saving design specifications, energy-saving monitoring standards and equipment. Economic operation standard; as long as the project implements various energy efficiency indicators, product energy consumption indicators and energy saving measures proposed in this report during construction and production, the project is feasible from the perspective of rational energy use. Based on this, it is determined that the project does not involve resource utilization on-line.
The design scale of the project is: lithium difluorooxalate borate 200t/a, of which 200t/a lithium tetrafluoroborate is used as the raw material for lithium difluorooxalate borate products, without post-processing work, but it can also be produced as a finished product separately according to market demand. Vinyl sulfate is 1000t/a. See Table 1.1-1

Table 1.1-1 List of product solutions