In recent years, with the development of the new energy vehicle industry, in order to cope with the decline of the new energy vehicle subsidy policy, automobile enterprises have gradually begun to layout industrial chain integration projects, especially in the field of battery, motor, electric control, the three major new energy vehicle parts, the “three power integration” upgrade and powertrain integration upgrade.
Let’s take a look at the results of new energy vehicles and new technologies.
As a cathode material for potassium ion batteries with high cycle stability and high rate performance, graphitized carbon nanocages are designed with layered structure and high graphitization degree carbon materials with high stability, so as to buffer the large interlayer changes in potassium storage process. This is the main challenge for graphite materials applied in potassium ion batteries.
It is reported that the power train of the traditional internal combustion engine is composed of the engine, transmission and so on. In the field of new energy vehicles, the power train is divided into three core technologies: “battery, motor and electric control”, which can also be regarded as the “three electric technology” mentioned above.
According to industry sources, the “three-in-one” technology can reduce the overall product development cost by up to two thirds.
At present, there are a comprehensive layout in the technology of the research and development of car enterprises mainly BYD, SAIC new energy, BAIC new energy, Ai Chi automobile and so on.
New energy vehicles in the technology, brand competition has been launched.
In the face of structural overcapacity in the new energy vehicle market, high-quality products and some high-cost and low-quality products relying on subsidies will accelerate the survival of the fittest in the market competition.
To date, although alloy-based materials, transition metal oxides/sulfides, and MXene-based materials have been reported as anode materials for potassium ion batteries (PIB), carbon materials are considered to be the most promising anode materials for large-scale practical applications.
Graphite has superior electrochemical activity when used as the negative electrode of PIB, because potassium ions can form intercalated compounds with graphite through intercalation reaction. When the first-order intercalated compound KC8 is formed, it has a theoretical specific capacity of 279 mAh¡¤g-1.
However, in the process of potassium storage, graphite materials will undergo large interlayer changes (the layer spacing increases by 60% when forming KC8), which will lead to serious structural degradation of graphite and rapid decay of cyclic properties.
Therefore, the main challenge of applying graphite materials to potassium ion batteries is to design high graphitization carbon materials with layered structure and high stability to buffer the large interlayer variation during potassium storage.
