Latest research progress of lithium batteries-Part 1
CAO Jin-liang, CHEN Xiu-qiang, ZHANG Chun-guang, LI Hong
(School of Electronic and Information Engineering, Taiyuan University of Science and Technology, Taiyuan Shanxi 030024, China)
Abstract: The latest progress of lithium batteries, including anode and cathode materials, electrolyte and equilibrium management circuit, was discussed, and the management plan and the development of the existing IC products were described.
Key words: lithium batteries; anode and cathode materials; electrolyte; equilibrium management circuit; SOC
Energy, information and environmental protection are important issues facing mankind in the 21st century. Facing the depletion of non-renewable energy sources such as petroleum, the research and development and utilization of clean energy and renewable energy have attracted wide attention from all countries. Lithium batteries have been used as early as the 1990s. With the continuous deepening of their research, countries around the world generally believe that lithium batteries will become one of the main candidate power sources in the 21st century.
The significant advantages of lithium batteries are their high specific energy, long cycle life, low self-discharge rate, no memory effect and environmental pollution . Nowadays, the research hotspots of lithium batteries by researchers from all over the world mainly focus on the three aspects of large capacity, long life and safety. Now, in-depth research has been conducted on battery design, positive and negative electrode material preparation technology, electrolyte and its additive improvement, battery production technology and integrated battery protection circuit, and a large number of research results have been applied to production practice.
The main obstacles and bottlenecks restricting the popularization and application of lithium batteries are battery charging time and safety issues. The safety of lithium batteries has always been a major issue that plagues the industry. The recall of electronic devices and accidents have also made consumers pay more and more attention to the safety of batteries. For example, the first-generation iPod nano recently suffered from safety hazards such as battery overheating. Apple will recall the first generation of iPod nano music players that have this problem, which has aroused widespread concern about battery safety.
Lithium batteries are mainly composed of positive electrode material, negative electrode material, electrolyte and battery balanced protection circuit. Now we will introduce them separately：
1 Development of positive and negative materials and electrolytes 1.1 Cathode material
The development history of lithium batteries is also the history of material development . Today, the cathode materials used for lithium-ion batteries are mainly phosphates, which have been widely used in small batteries, but they are not suitable for large-scale EV and HEV power batteries due to safety issues. Received date: 2013-01-05 About the author: Cao Jinliang (1969—) male, native of Henan Province, Ph.D. The main research direction is Detection technology and its automation. in. Compared with most metal oxide cathode materials, it has good thermal stability and high safety, coupled with its good electrochemical performance, so since its inception, it has been widely concerned by people and has become a lithium ion battery. One of the hot spots in the research of cathode materials.
Lithium batteries are classified into lithium cobalt phosphate, lithium manganese phosphate, and lithium iron phosphate according to the positive electrode material. Among them, lithium cobalt phosphate is relatively expensive. From the perspective of battery production costs, lithium cobalt phosphate is not the preferred cathode material; lithium manganese phosphate is inferior to lithium iron phosphate in terms of safety and service life. It can be seen that lithium iron phosphate batteries will become One of the main energy sources for development at the moment.
India's largest car manufacturer Tata has teamed up with British powertrain engineers to plan to build the second generation of Indica. The car battery uses a 31 kWh lithium iron phosphate battery, which has a cruising range of 160 km and a maximum of 200 km. It can be seen that lithium iron phosphate batteries are feasible in practical applications.
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