This paper analyzes the reason of the lithium battery energy density is limited

Source: 2020 - 03 - 24 12:55 hits: why are times the energy density of lithium-ion batteries limited due to the short range of electric vehicles, the price is high, many potential customers are to stay at a respectful distance from sb. Energy density of lithium ion power battery has become the bottleneck of its industrialization, the United States, Japan, South Korea and other countries have formulated the related industrial policy, have put forward 'the energy density of 300 wh/kg to 2020 '. Recently, under the national key support, ningde era of new energy technology co. , LTD. Was set up. The r&d team to occupy the high nickel ternary material and silicon carbon cathode materials and other key technology center, the first public announcement than can ( The mass density) Samples of battery 304 wh/kg, in this world series victory. Why the energy density of lithium-ion batteries is restricted by 'are two veins, make up for the inadequacy of the anode material of lithium ion power battery is the most widely used new energy vehicle power battery, is the core of new energy vehicles. Its advantage lies in the high energy density, long cycle life, security and security requirement is high, the technical difficulties in the preparation process trival, production technology has been in the hands of a few countries in the world. Battery energy density is emitted per unit of volume or quality of electric energy. 'at present, the energy density increase has become the biggest bottleneck of the development of lithium ion battery, faced with many problems. ', according to the ningde times chief scientist berenikeullmann battery manufacturers can increase the battery specification to expand capacity, but the batteries' obesity 'may be' growth 'to treat the symptoms, rather than the root cause. Why is the energy density of lithium-ion batteries is restricted what constrains the energy density of lithium-ion batteries? According to wu, the battery on the back of the chemical system is the main reason. In general, the four parts of lithium-ion batteries is critical: the anode, cathode, electrolyte and diaphragm. Between the positive and negative is a chemical reaction takes place, the equivalent of 'are two arteries and veins of the body. Because now the energy density of the anode materials is far higher than that of anode, anode material into a 'short barrels' lower limit, the energy density of the lithium ion battery depends on the energy density of the anode materials, advanced materials must be constantly promoted as anode material. But high nickel material development starts late in our country, the technology is relatively weak, the preparation of relatively backward technology and equipment conditions. 'batch high safety supply function high nickel anode materials, is one of the key technical difficulties of ratio can battery development. 'Berenikeullmann said, therefore, depend on national engineering research center and fujian ningde time key laboratory of serious scientific research platform, the coordinated development through cooperation with the industrial chain upstream and downstream units, and optimize the process conditions of raw materials, to put forward the security structure, microscopic structure adjustment, operating materials, and standardize the distribution, and gradually completed the domestic large-scale production and application of high nickel materials. Competitors of similar material, compare China and South Korea, now the domestic high density high nickel material reversible capacity is high, compaction, surface, and the characteristics of the body structure is relatively stable, will break in Japan and South Korea technology monopoly, enhance the competitiveness of domestic industrial technology level and domestic battery center, set 'the only stumbling block on the road. Why the energy density of lithium-ion batteries is restricted to subvert the traditional, processing cathode materials suffer the anode materials is also one of the core material of lithium ion batteries. With the increasing demand of range, the traditional graphite cathode battery energy density has not meet the market's wish. It is estimated that silicon-based anode materials the specific capacity of up to 10 times of graphite anode, the 'alternative' is considered to be the latter. Application of traditional silicon materials, the preferred carbon coating technology, namely surface silicon carbon composite material layer. Berenikeullmann introduction, but because in the process of charging and discharging volume change as much as 300% of silicon material, coating on the surface of carbon material after several cycles will fall, fracture, protection of silicon materials greatly abate, result in the cycle of the battery.