Is the electrolyte an important part of the safety of lithium batteries?

Electrolyte is one of the four key materials of lithium batteries (positive electrode, negative electrode, diaphragm, electrolyte). The blood of lithium battery, known as the blood of lithium battery, plays the role of conducting electrons between the positive and negative electrodes of lithium battery. It is the lithium battery obtains high voltage and high voltage. Guarantee of advantages such as energy ratio. In today's era, lithium batteries are widely used, and they are common in data centers, communication base stations, rail transit, and industrial integration. Lithium batteries are so widely used in our lives, so the safety and durability of lithium batteries have become our focus. Challenges in the development of electrolyte The electrolyte is not suitable for high pressure resistance and will be analyzed by oxidation, and the heat release will increase the temperature of the battery. At high temperatures, once the SEI film analysis on the negative electrode surface is destroyed, the exposed negative electrode and the electrolyte will generate heat Reaction, the battery temperature will further increase, causing the electrolyte to react with the positive electrode material and the binder thermally, which may cause the battery to explode. Electrolyte improvement process US researchers recently reported that the use of highly fluorinated electrolyte can greatly improve the storage capacity and durability of lithium batteries. Lithium batteries using flammable organic electrolytes have always restricted the development of lithium secondary batteries (also known as rechargeable batteries or accumulators) to electric vehicles and large-scale energy storage. Recently, the team of Professor Yuliang Cao from the School of Chemistry and Molecular Sciences of Wuhan University and the Pacific Northwest National Laboratory of the United States jointly published online research results on the use of non-combustible phosphate ester electrolytes in lithium batteries in 'Nature Energy'. The University of Maryland, the Army Research and Testing Institute, and the Argonne National Laboratory have prepared a battery with extremely unstable chemical properties of lithium metal as the negative electrode. It is equipped with a high-fluorine electrolyte that can charge and discharge up to a thousand times. The electrical capacity has only dropped to 93% of the initial. The technological development of lithium battery electrolyte is complementary to lithium battery. The electrolyte must be compatible with the cathode material and anode material selected by the customer, as well as the final performance requirements of the customer's lithium battery. From the perspective of technological development, the electrolyte must adapt to changes in the continuously evolving lithium battery technology system and the use requirements of terminal equipment, and constantly adjust its performance and composition. Trends in the domestic electrolyte market. Electrolyte vehicles continue to expand production, and industry competition is becoming more and more fierce. The price of electrolyte dropped from 400,000 yuan/ton at its peak in 2017 to around 50,000 yuan/ton this year. The oversupply situation in the electrolyte market in a short period of time has not changed, and the electrolyte price will remain low. The price may continue to fall. According to the China Automobile Association's forecast, the production and sales scale of my country's new energy vehicles will exceed 1 million in 2018, based on the rising level in the first five months. If each vehicle requires 60 kilograms of electrolyte, my country’s new energy vehicle market will require 60,000 tons of electrolyte in 2018. According to incomplete statistics, the electrolyte output of mainstream listed companies alone will exceed 100,000 tons from 2018 to 2019. In 2018, the power lithium-ion battery electrolyte market will still be in a situation of oversupply. A good electrolyte has a great impact on the safety and durability of lithium batteries, and the lithium battery electrolyte for energy storage is also a specially designed and formulated electrolyte, which effectively improves the practicability of lithium batteries. Energy storage electric lithium iron phosphate batteries are used in small computer rooms, weak current rooms and other room sub-systems, new energy outdoor sites, communication base stations, indoor and outdoor non-air-conditioned sites, radio and television, military, petroleum and meteorological and other unmanned sites. With safety, high efficiency, energy saving, and green as the design and development concept, we provide users with safe, stable and efficient lithium battery products and treatment methods. Non-aqueous electrolytes are widely used in lithium batteries due to their wide electrochemical window and excellent electrochemical performance. However, non-aqueous electrolytes have high flammability and volatility, which may cause safety problems such as fires and explosions in lithium batteries. In order to overcome the flammability problem of the electrolyte, the traditional method is to add flame retardants to the non-aqueous electrolyte, but these flame retardants will cause a strong oxidation-reduction reaction on the surface of the negative electrode, seriously deteriorating the battery performance. Recently, the team of Professor Hongfa Xiang of Hefei University of Technology developed a new type of high-concentration non-combustible electrolyte to make up for the above-mentioned shortcomings. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What to pay attention to when charging and discharging polymer lithium-ion batteries