Dynamic lithium-ion battery development needs to consider comprehensive performance green recycling is imminent

Awdur: Iflowpower - Mofani oa Seteishene sa Motlakase se nkehang

my country's new energy automotive industry has risen, which has prompted the dynamic lithium-ion battery technology to develop rapidly, and the power lithium-ion battery retirement has triggered all parties concerned. On August 1, "Interim Provisions on the Administration of New Energy Automobile Power Battery Recycling" (referred to as "Recycling Traceability Regulations") will formally implement, emphasize the implementation of the processed responsibility extension system, requiring auto processing companies to take the main responsibility of the power storage battery recycling. This provision is alert to resource waste and environmental pollution.

Wu Feng, academician, my country Academy of Engineering, and Wu Feng, director of the Green Energy Research Institute of Beijing Institute of Technology, said in an interview with reporters, developing lithium-industrial industries, and do high-efficiency utilization of advanced battery technology research and development and lithium resources. For the recovery of power lithium-ion batteries, you should try to use green recovery techniques, and the guards have caused secondary pollution to the environment. Frontier breakdown Multi-party will continue to start at the beginning of 2000 my country Electric Automobile Project, Xu Guanhua, Minister of Science and Technology, has pointed out that the key to electric cars is the battery.

At present, lithium-ion batteries have become hot spots of all parties concerned. In Wu Feng, the lithium-ion battery has become the hotspot, which is the current international competition, which has become the current international competition, and become the current international competition. Communication (5G), key links such as electric vehicles, energy storage power stations and security.

Recently, there were reports that the X-57 pure electric aircraft project developed by the NASA (NASA) has been carried out for 3 years, so that the first flight is to achieve air zero emissions, and the commercialization of commercialization is more difficult to develop. my country's new energy car subsidies have presented subsidy. This year, the Ministry of Finance, Ministry of Industry, Ministry of Science and Technology, and the Development and Reform Commission jointly announced the "Notice on Adjustment of New Energy Automobile Promotion and Using Financial Subsidy Policy", and the subsidies of pure electric passenger cars began to slide, and further improved lithium ions Battery energy density requirements.

Wu Feng believes that the development of dynamic lithium-ion batteries and new energy vehicles must strive to meet the market development needs. The country is interested in encouraging high-energy density batteries to achieve longer battery life, meeting further demand for markets. 2020 subsidies will be canceled, it is a matter of urgent way to make battery and new energy cars better adapt to market development and demand.

Since the "13th Five", the development trend of energy-lithium-ion battery energy density indicators has become higher and higher. 2015 dynamic lithium-ion battery energy density index is 120 ~ 180 watt / kg, material system is tight to lithium iron phosphate - graphite, termer material - graphite. In recent recent, 2020 new generation of power lithium-ion battery energy density indicators is: lithium-rich material-silicon carbon negative electrode battery core is 300 watt / kg.

From the perspective, medium (2025) to achieve 400 watt / kg, long (2030) to achieve 500 watt / kg. In recent years, the key materials and techniques of battery are remarkable, but there is still room for improvement. Here, it refers to the improvement of comprehensive performance, including the safety, energy density, power density, life, cost, etc.

Only battery overall performance improved, in order to better meet the development of new energy auto markets. From a technical point of view, lithium-ion batteries should be simple to do with energy, but it is difficult to do high indicators, because it is necessary to consider constraints of various conditions. Wu Feng believes that the use of three-dimensional positive material and silicone carbon negative electrode material, can prepare energy density 319 watt / kg high ratio energy lithium-ion battery.

However, the energy density of the dynamic lithium ion battery is increasing in addition to the positive and negative electrode material, and the risk of the electrolyte used is increasing, and one of the risk of the lithium ion battery is the electrolyte. To this end, while seeing the tightness of the dynamic lithium ion battery, it is also necessary to consider the implementation of some industrialization indicators. Especially as the battery energy density of key indicators, how to take into account safety, cycle, and magnification, such as energy, cycle, and magnification, etc.

In fact, the current high-specific energy battery research is the most intute technology in the industry. Wu Feng is hosted by the national 973 lithium-ion battery research project, since 2002, I have experienced the third phase. The project is desirable to study, from "light elements, multi-electronic response" materials, combined with polyionic effects, develop high-active electrode materials, and construct a high-specific secondary battery new system.

The recycling link should be green technology, the second battery production has risen sharply, which has penetrated into the various categories of the national economy and people's lives. The battery has a huge environment and resource pressure on the society. Studies have shown that 1 20 grams of mobile phone battery can pollute the water of 3 standard swimming pools; if it is discarded on the land, it can make 1 square kilometers of land pollution for about 50 years.

In Wu Feng, if it is a few tons of electric vehicle power lithium-ion batteries discard in the natural environment, a large number of heavy metals and chemical substances enters nature, which will cause great pollution to the environment. It is because there is a large amount of potential pollution hidden dangers, the power lithium-ion battery industry is not to accelerate the footsteps of recycling mechanisms. Power lithium-ion battery recycling work is getting more and more.

In a global scale, Wu Feng's prediction is that the number of global waste lithium-ion batteries is about 25 billion to 2020. The negative impact on the environment will be increasingly serious, and the lithium resources will also be weak, and the dynamic lithium-ion battery recovery is imminent. In this context, "Recycling" is about to land on August 1st.

The general service life of the power lithium-ion battery is about 20 years, but the general capacity is decremented to 80%, and will be retired and the usage time is about 3 to 8 years. As the world's largest new energy auto market, Wu Feng believes that the power of the whole industry should be set by the development of waste lithium-ion batteries. Dynamic lithium-ion battery recovery involves a cost problem.

After all, lithium resources and cobalt resources are non-renewable resources, so waste battery materials recycling and resource renewal have a critical economic and social benefits. Take Japan as an example, which recovered through waste metal, the annual recovery of gold exceeds the world's largest production of South Africa, the silver production exceeds the world's most ubiquitual Poland. In terms of recycling technology, there are currently more artificial art technology at home and abroad, which is difficult to prevent secondary pollution in strong acid recovery.

Wu Feng team adopted the recovery technology of natural organic acids, compared with the current strong acid, sulfuric acid and nitric acid abroad, which was green, which was better than the level of strong acid in extraction and extraction time, and realized the waste. Green Efficient Recycling of Lithium Ion Battery. For positive material, it was originally used to recover metal ions in waste batteries in natural organic acids (citric acid, malic acid, ascorbic acid, etc.

), and lithium ions and cobalt ion extracts were over 90%. The natural succinic acid in recently adopted, the extraction rate increased from 94% to 99%, and the extracted battery material also reached the requirements, and qualified positive material can be prepared. For negative electrode materials, the original idea is that the recycling carbon negative is not cost-effective, the idea of ​​the Northern Workers team is to recover the negative recovery of waste lithium-ion batteries.

How to prepare carbon adsorbents, use for high phosphorus sewage. At present, the amount of phosphorus adsorption is up to 588 μg / g is one of the highest carbon adsorbents, and the adsorbent after the sewage can also be used as soil sustained release fertilizer. In Wu Feng's view, the development of new green secondary batteries originated from secondary battery solid electrolyte materials and nickel-hydrogen battery hydrogen storage materials, relying on innovation and progress in key material technology.

The team led by experts from Beijing University of Technology, Wuhan University, Tsinghua University and other units, from 2002 to this day, has been cooperated for 16 years. Any related experience in many years is: innovation is not hypere, can not be very eager to have a good time, otherwise it will be blooming; the development of industrial development depends on the market, can't make long, otherwise it will be a cloud smoke. .