Why is there no revolutionary progress in lithium-ion battery technology?

With the development of science and technology, the performance of smart phones is getting higher and higher, the screen is getting bigger and bigger, the resolution rate is getting bigger and bigger, the camera is getting more and more advanced, the function is getting more and more advanced. But you may not understand that the battery technology of mobile phones has not improved much for 24 years. Not only the cell phone in your cell phone, but also the latest electric cars. Without the battery, they are just scraps of iron. Compared with the rapid progress in other fields of science and technology, what problems have been encountered in the development of battery technology? Don't worry, the author will come together for everyone. 1. The birth time and principle of lithium-ion battery In 1991, Sony launched the first commercial lithium-ion battery, which is still used today and is known as the mainstream electronic device battery technology. Because lithium ion is the lightest alkali metal element, it has the characteristics of being smaller, lighter, and higher energy density, so it quickly replaced nickel batteries. Lithium-ion batteries include iron phosphate, manganese, graphite, titanate and other metal and non-metal materials. However, the electric energy and chemical energy can be realized only by the insertion and extraction of lithium ions in the positive and negative electrodes. The mutual transformation, and finally complete the charge and discharge process. From 1991 to 2015, the battery technology was not without progress, but the development was slow. At present, lithium-ion batteries are far higher than lead-acid and nickel-metal hydride batteries in terms of energy density, high and low temperature characteristics, and rate performance, but it is still difficult to meet the rapidly rising demand for electronic products and electric vehicles. 2. Two ways to increase battery capacity There are only two essential ways to increase the battery life of lithium-ion batteries. One is to increase the battery volume to expand the power, and the other is to increase the density in a limited volume to obtain long-term energy efficiency. The first method is currently used in Tesla battery cars. Remove the Tesla shell. Underneath are more than 7,000 18650 batteries, weighing 700kg, which is close to one-third of the total weight of the car. The second method is often used on mobile phones. Due to the limited size of mobile phones, it is impossible to plug batteries in unlimitedly. However, after the efforts of researchers, the density of mobile phone batteries has been greatly improved. The use of high-energy ratio negative electrode materials has doubled the capacity of mobile phone batteries per unit volume.