18650 lithium battery

　　What is the development trend of 18650 lithium battery electrolyte technology?

　　Demand for 18650 lithium battery electrolyte is growing rapidly

　　After years of continuous process improvement and technology accumulation, my country's electrolyte products have not only continued to grow in terms of output, but also product quality has reached the international advanced level. In recent years, the sales volume of my country's 18650 lithium battery electrolyte market has grown rapidly, from 16,800 tons in 2011 to 88,800 tons in 2016, with a compound annual growth rate of 39.51%.

　　Demand for lithium batteries is growing rapidly. With their excellent performance, lithium batteries have gradually replaced nickel-metal hydride, nickel-cadmium and other batteries and are rapidly gaining popularity in the field of mobile power supplies. Global 18650 lithium battery production has maintained rapid growth in the past few years, growing rapidly from 5.95GWh in 2003 to 33.5GWh in 2012, with an average annual growth rate of 21.6%. Currently it is mainly used in mobile phones, laptops, power tools, energy storage and other fields.

　　China's 18650 lithium battery production is growing rapidly. From 2008 to 2013, China's 18650 lithium battery production increased from 1.03 billion to 4.77 billion, an increase of 3.6 times, with an average annual compound growth rate of 30%. With the explosive growth of the three major needs of electric vehicles, electric bicycles and energy storage batteries, the demand for lithium batteries will continue to grow rapidly in the future. The 18650 lithium battery electrolyte market has huge potential.

　　18650 lithium battery electrolyte technology development trends

　　1. High specific energy electrolyte

　　The pursuit of high specific energy is currently the biggest research direction of lithium batteries, especially when mobile devices occupy an increasing proportion of people's lives, battery life has become the most critical performance of batteries.

　　2. High-power electrolyte

　　Low temperature and high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%

　　Charging temperature: 0~45℃ Discharge temperature: -40~+55℃ Specific energy: 240Wh/kg -40℃ Discharge capacity retention rate: 0.5C Discharge capacity ≥ 60%

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　　At present, it is difficult for commercial lithium batteries to achieve high-rate continuous discharge. The main reason is that the battery tabs are seriously heated, and the internal resistance causes the overall temperature of the battery to be too high, which is prone to thermal runaway. Therefore, an electrolyte is required that can prevent the battery from heating up too quickly while maintaining high conductivity. For power batteries, realizing fast charging is also an important direction for the development of electrolytes.

　　3. Wide temperature electrolyte

　　At high temperatures, the battery is prone to electrolyte self-decomposition and intensified side reactions between materials and electrolyte parts; while at low temperatures, electrolyte salts may precipitate and the negative electrode SEI film resistance may double. The so-called wide-temperature electrolyte allows the battery to have a wider working environment.

　　4. Safety electrolyte

　　The safety of batteries is mainly reflected in combustion or even explosion. First of all, the battery itself is flammable. Therefore, when the battery is overcharged, overdischarged, short-circuited, when it is punctured or squeezed by the outside world, when the outside temperature is too high, it will may cause safety accidents. Therefore, flame retardancy is a main direction of research on safe electrolytes.

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