Many enterprises break through the high nickel 811 battery 300Wh/kg energy density
Since 2018, a number of companies including lishen battery have made technological breakthroughs in high-nickel NCM 811 and NCA ternary batteries, which also drives the application of silicon-carbon anode materials. Recently, an enterprise released a record of communication and interaction with investors. The sample of high nickel NCM 811 ternite soft bag prepared by it has passed the mid-term inspection of the ministry of science and technology recently. The energy density is up to 302 Wh/kg, and the negative electrode is made of silicon carbon material.
A $5 billion market
As a new type of cathode material for lithium ion batteries, silicon carbon anode plays a more significant role in improving the energy density of the battery than graphite anode. The application of silicon-carbon anode materials can increase the content of active materials in the battery, thus greatly increasing the capacity of the single cell.
According to the action plan for promoting the development of automobile power battery industry released by the ministry of industry and information technology and other four ministries and commissions, the specific energy of China's new-type lithium ion power battery monomer will exceed 300Wh/kg by 2020 and reach 500Wh/kg by 2025. It is difficult for traditional graphite materials to meet this requirement. Therefore, in the development path of high energy density, high nickel ternary materials are used for the positive pole of power batteries, while silicon carbon anode materials are used for the negative pole.
It is not difficult to conclude that the NCM 811 and NCA will become the mainstream of the power battery market in the future. With the preparation technology of silicon carbon anode and the technology of high nickel system mastered by battery manufacturers becoming mature, silicon carbon anode will have a broad market in the future. Data shows that in 2018, domestic consumption of silicon-carbon composite materials reached 2000-3000 tons, about doubling year-on-year. It is predicted that the domestic silicon carbon anode material market will reach 5 billion yuan in 2020.
Internationally, silicon-carbon materials have been widely used in Japanese and Korean enterprises. Tesla has applied the silicon carbon negative electrode to the vehicle power battery. The Model 3 USES the silicon carbon negative electrode, and 10% silicon is added into the traditional graphite negative electrode material to increase the battery capacity to more than 550mAh/g, and the monomer energy density to more than 300wh/kg. Japan has realized the mass production of 18650 battery made of silicon carbon anode material. Japan also introduced the silicon carbon anode material lithium battery, applies in mitsubishi motors; Developed high current capacity silicon anode lithium battery; Japan is pushing silicon-negative lithium batteries into consumer electronics and electric cars.
From the domestic situation, the leading battery enterprises are accelerating the development and trial production of silicon carbon anode system. Material enterprises, some into the supply chain of tesla, panasonic's power battery cell supporting part of the negative material; Some have small trial production capacity; In addition, they are also actively promoting the industrialization of silicon carbon anode.
It is reported that as early as October 2016, an enterprise and the institute of physics of the Chinese academy of sciences and other institutions jointly declared the "industrialization technology development of a new generation of lithium ion power battery" project started to develop lithium ion power battery with high nickel ternary material as the positive electrode and silicon carbon composite as the negative electrode. And not long ago, ouyang minggao of academician of Chinese academy of sciences introduces, the specific energy of battery of high ni 3 yuan positive pole and silicon carbon negative pole that this enterprise develops already achieved 304Wh/kg, will put on the market this year.
In 2018, with the support of the national key research and development program "new energy vehicles", lishen battery project team developed a nickel-series positive electrode material with high specific energy, long cycle life and good safety performance for lithium ion power battery based on the preliminary research of NCA positive electrode material. Through nano-preparation, nano-dispersion, coating and pre-embedded lithium and other technologies, developed high capacity, high first efficiency, cycle stability and good rate of performance of silicon carbon anode materials. The specific energy of cell monomer developed based on this system is up to 303Wh/Kg.
In addition to the field of new energy vehicle power batteries, in the field of energy storage, silicon carbon anode materials will also have a better application prospects. At the same time, aerospace, ships and ships and other fields have also put forward higher energy density and power density requirements for lithium ion battery, and nano-silica carbon material is also the most potential lithium ion battery cathode material at the present stage, and its application prospect is very broad.
The obstacles are great
Nevertheless, the personage inside course of study says, silicon carbon negative pole material has had very big promotion now popularity, but still have many obstacle on application.
First of all, in the process of mass production of batteries, there are still problems such as rapid capacity attenuation, easy deformation of batteries, and the number of cycles failing to meet the requirements. Secondly, the cost performance is not high. When the battery capacity increases by 5% to 10%, the cost of the battery will increase by 20% to 30% or even higher. High nickel ternary + silicon-carbon composite materials have always been considered as the gold match, but there is a problem of one-to-one matching between diaphragm and electrolyte, and it is difficult to find the matching electrolyte.
Although the large-scale application of silicon-carbon anode materials still has a long way to go, with the gradual application of high-nickel NCM811 and NCA ternary batteries, the demand for silicon-carbon anode materials is bound to explode.