Reveal the ternary power lithium batteries more and more strong

Source: 2020 - 03 - 23 14:42 hits: three times to lithium batteries, increasingly powerful reasons revealed it is well known that in recent years, with the ternary material as the anode material of power lithium batteries because of its high capacity and good cycle stability, moderate cost important advantages, such as in power battery industry occupies more and more important position. In the new energy cars, ternary lithium batteries share has more than lithium iron phosphate batteries become a major bright spot, including geely, chery, changan, zhongtai, such as China, the domestic each big mainstream car companies have launched using ternary power battery of new energy vehicles. Such as Beijing EV series, chery, jianghuai iEV4, eQ, arezer 3 EV zhongtai cloud 100, geely emgrand EV, etc. After all, what makes three yuan more powerful batteries? According to an article before, 'hold your hand learning lithium-ion batteries, lithium ion battery function depends on the anode material, are often named after it. Mentioned batteries ternary material on the market mainly refers to nickel, cobalt, manganese as the anode material of lithium ion batteries. 1. Nickel cobalt manganese ternary structure characteristics of the anode materials NMC ternary material generally can be expressed as: LiNixCoyMnzO2, where x + y + z = 1. According to the mole ratio of three elements ( x∶y∶z) Different, they are known as different systems. Mole ratio of 5:2:3 system known as the 523 system. Nickel, cobalt, manganese ternary speculation, three elements of the main valence to + 2, + 3 and + 4, nickel as the main active elements. The reaction in the process of charging and charge transfer is as follows: positive reaction: LiMO2 & rarr; Li1 - xMO2 + xLi+ + xe- The negative reaction: n C + Li + + e - x x - → LixCn battery overall reaction: LiMO2 + n C→ li1 - Xmo2 + LixCn in general, active metal component content is higher, the greater the carrying capacity of the materials. But when the Ni content is too high, can make the Ni2 + Li + position, increase cationic hybrid, resulting in a decline in capacity. Co is a kind of active metal, but it can inhibit cationic hybrid, thus stable material layer structure. Manganese is not involved in the electrochemical reaction, can provide security and stability, at the same time reduce the cost. 2. Different systems of the NMC ternary lithium ion battery features on the market at present there are many nickel cobalt manganese battery, ternary such as 523111811 series, etc. Figure 2 can help us to intuitive understanding of the characteristics and differences of each system. As a car power battery, market demand for its energy density is more and more strict. However, you cannot sell the cow and drink the milk. Can be seen from the figure 2, in order to get a high energy density of the security and stability of power battery, need to add nickel and cobalt in triples. To is a distinct safety risk characteristics of Ni and Co in resources lack of funds. The batteries for the nickel cobalt manganese ternary system is also introduced briefly. 2. 1 LiNi0。 5 Co0。 2 Mn0。 Type 302523 ternary material consumption is the largest three yuan, due to its high specific capacity and thermal stability, and technology advancement and constantly improve the stability, market share expanded rapidly. The type 523 ternary material pursuit of big size, large specific capacity ( The compaction density) , circulation, multiplier, thermal stability, self-discharge, such as balance, as the power battery, can greatly improve the endurance ability of electric tools. 2. LiNi1 2/3 co1/3 mn1 three yuan / 302111 type material has energy, multiplier, circularity and safety performance, etc. But 111 type material in low power and charging and discharging lithium layer at a time of cationic hybrid affected the stability of the material, low discharge voltage platform. At present, lini1/3 co1/3 mn1/302 materials under high temperature and high pressure stability and multiplier function density, cycle has become the research focus of the material. Type 111 ternary material power battery has high specific capacity, circularity, diversity, low temperature discharge and recharge durability and safety performance, can satisfy the electric vehicle and hybrid electric vehicle requirements of power battery.