Graphene-based lithium-ion power battery, fast charging, high energy, long service life!

by:CTECHi     2021-07-27

Today, vigorously developing lithium-ion power battery vehicles, using electricity instead of oil, is one of the strategic measures to ensure my country's energy security.

Trucks loaded with scrap mobile phone batteries and electric vehicle batteries drove into the recycling plant. Batches of discarded batteries were dumped into the processing production line, passed through several checkpoints, were unloaded, and returned to the furnace for remanufacturing. Workers control the machine and wait to separate and recycle the plastic, metal, and waste metal in the battery. These recycled materials are likely to be used in the manufacture of the next battery.

In September last year, this watch was widely circulated in the technology circle.

(The timetable for the ban on the sale of fuel vehicles in various countries. Picture source: China New Automobile)

Including the Netherlands, Germany, and France Many countries such as the United Kingdom and the United Kingdom have announced a timetable for the ban on the sale of fuel vehicles. The most radical one is the Netherlands, which plans to ban the sale of vehicles in 2025. Xin Guobin, Vice Minister of the Ministry of Industry and Information Technology, revealed at the 2017 China Automotive Industry Development (TEDA) International Forum on September 9 that China has begun to study and formulate a timetable for banning the sale of traditional fuel vehicles.

Relevant data shows that this year's new energy passenger vehicles have maintained a continuous monthly growth trend for 7 consecutive months. According to industry insiders, the new energy automobile industry has just started and will maintain a compound growth rate of 30% in the next few years, making it the industry with the most certain growth. With the rapid development of new energy vehicles, as the 'heart' of new energy vehicles, the power lithium battery industry is also growing rapidly.

However, with the explosive growth of new energy vehicles, the amount of scrapped power batteries is about to usher in a small peak. The service life of lithium batteries in electric vehicles is generally 3-5 years. Because when the battery capacity decays below 80% of the initial capacity, the cruising range of the electric vehicle will be significantly reduced, and the power battery will have to be replaced.

How does the battery 'rebirth' step by step?

Today, the vigorous development of lithium-ion power battery vehicles and the use of electricity instead of oil are one of the strategic measures to ensure my country's energy security.

What the little brick will talk about today is the graphene-based lithium-ion power battery.

This project is aimed at the current performance requirements of electric vehicles for fast charging, high energy and long life of power batteries, and is engaged in high-quality graphene-based lithium-ion power batteries for electric vehicles The development of this project will help China occupy a favorable position in the field of lithium-ion batteries and improve China’s international competitiveness in the field of new energy vehicles. On the whole, the industrialization of this project will enable China’s lithium-ion power battery products for electric vehicles to span Entering the international advanced ranks, and thus forming a regional advantage.

Original function

1. Propose a small molecule-assisted exfoliation method for the large-scale preparation of high-quality graphene powder for lithium batteries It has independently designed and built a pilot-scale preparation line for 100kg-level graphene powder. The prepared graphene materials are used in lithium-ion power batteries to significantly improve the performance.

2. Using a new type of dispersant and dispersion technology, developed a graphene oil-based conductive paste with good dispersion and strong stability, which has good processing performance and can be directly applied to lithium-ion batteries The production process solves the current problems of difficult dispersion, easy agglomeration, and poor processability in the application of graphene in lithium batteries.

3. Utilizing the large surface area and high conductivity of graphene to develop a fast-charging and long-life graphene-based lithium iron phosphate battery, shortening the battery charging time to 6 minutes .

Table 1 Comparison of this graphene-based lithium iron phosphate battery with other technologies of the same type

Table 2 This graphene Comparison of basic ternary battery with other technologies of the same type

There is also a feasible solution to the battery recycling problem

Finally about Battery disposal problem. This problem is that the electric vehicle Ru0026D team of Shenzhen Advanced Institute of Chinese Academy of Sciences is developing a fully automated production line for dismantling and processing lithium batteries. The team aims at the recycling, dismantling and utilization of scrap batteries. The goal is to build an environmentally friendly production line with all materials recycled. .

The battery initially passes through the first-stage treatment system consisting of a breakdown system and a waste gas liquid recovery system. After this step, the metal casing of the battery is removed, and the electrolyte and toxic and harmful gases generated during the dismantling process are also effectively recovered by the waste gas liquid device.

Next, the battery will enter the separator and electrode material separation system, where the battery will go through the four separation systems respectively. After coming out, the battery will be basically unloaded. Eight yuan'. In this step, the production line can obtain diaphragms, carbon powder, electrode materials, etc. The electrode material is the most 'valuable' part of the battery, it accounts for more than 60% of the battery cost, so the recycling value is the highest.

The last step, through the wet smelting system, can extract high-purity lithium, iron and other metals in the electrode material, and recover precious metals such as lithium, cobalt, nickel, and manganese. After this step, in addition to the metal can be reused, the remaining 'harvest' can also be sold as products to battery companies.

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