What are the reasons restrict lithium battery energy density?

Source: 2020 - 04 - 01 14:08 hits: time many potential consumers for electric cars, because they are short range, price is high. After all, is what limits the energy density of lithium batteries? In fact, pacion battery chemical system is the main reason behind. In general, the four parts of lithium-ion batteries is crucial: the anode, cathode, electrolyte and diaphragm. Between the positive and negative is a chemical reaction takes place, the equivalent of two veins of the body. Due to the energy density of negative electrode data is greater than the positive electrode data, positive electrode data become a barrel short cut-off for the lithium ion battery energy density. But high nickel data development starts late in our country, poor technology, preparation process and equipment condition is relatively backward. High performance high nickel anode data is one of the key technical difficulties of ratio can battery development. Subverts the traditional method of calculating the negative damage to the hard data is also one of the core data of lithium ion battery anode data. With the constant improvement of the demand, the traditional graphite cathode has been can not meet the requirement of the market of the energy density of batteries. It is estimated that silicon-based specific capacity of anode material can be up to 10 times of graphite anode, graphite anode can be used as a substitute. Traditional silicon base according to the application of the main used carbon cladding technology, namely the silicon surface a layer of carbon composite data. But in the process of charging and discharging, because silicon data volume change is as high as 300%, covering the surface of the carbon data will break off after many cycles, severely weakened the silicon data protection, leading to cell cycle performance is poor. In the same power consumption, size and components of limited cases, range of new energy vehicles, mainly depends on the energy density of the battery pack.