The lithium battery industry attracts hundreds of billions of dollars. Where does the golden compass point? The 2018 China International Lithium Battery and Electric Technology Development Summit Forum will be held in Shanghai on April 20-21

　　The lithium battery industry attracts hundreds of billions of dollars. Where does the golden compass point? The 2018 China International Lithium Battery and Electric Technology Development Summit Forum will be held in Shanghai on April 20-21. The conference is organized by: First Lithium Power Grid, First Electric Vehicle Network, China Co-hosted by Charging Pile Network, Lithium Battery Hundreds Association, and He Li Exhibition, at the same time: China International Electric Vehicles and Charging and Swap Technology Summit Forum, this conference more than 40 guests attended the speech sharing, and more than 500 guests attended.

　　Good morning everyone, I am Guoneng Battery from Beijing. Today I will talk about the development of high-performance batteries. The four parts I will talk about today are the first background introduction, the second talk about the product technology route, the third is for the design and related progress of high-performance batteries, and the fourth is about the planning and development of Guoneng battery. The general capacity situation.

　　First, let me talk about the overall new energy power background. With the derivation of national policies, environmental pollution is getting more and more serious. Our demand for new energy vehicles is increasing. Statistics show that from 2009 to 2015, 740,000 vehicles increased. The number of new energy vehicles in the world will reach 6.6 million in 2025. The sales of new energy vehicles will drop significantly in the next ten years. From the perspective of this model in the new energy market, passenger vehicles are mainly occupied by the ternary system. The dedicated ternary system is also relatively large. At present, the ternary system is mainly used. With the national policy of 300WH/KG by 2020 and the cost will be reduced to one dollar per watt-hour, the current thinking of each battery system is similar, and the earliest is With LFP+carbon graphite as the volume of 110-160WH/KG, with the increasing energy density of the ternary positive electrode and negative electrode system, this energy does not meet people's requirements. As the requirements become higher and higher, the system is constantly changing , Followed by slowly NCM + carbon to 16O-220WH/KG, filtering to rich lithium + silicon 260-350WH/KG, it can basically meet the requirements of the national policy in 2020, and finally there are some cutting-edge, now we are in the system At present, the research is still based on the ternary system, or ternary and graphite or silicon carbon.

　　Our company’s technical route last year was 160WH/KG, and this year’s system was 180WH/KG. Last year, the ternary system was mainly based on 523 and graphite systems. Now this year, it is slowly shifting to 622 graphite and silicon carbon systems. The further development of high-fracture pressure silicon-carbon systems will definitely move to all-solid-state batteries in the future. This is the battery development roadmap.

　　If we take the silicon-carbon system as the technical route of the negative electrode, we will first launch the 622 silicon-carbon system with 260WH/KG this year, and the 622-silicon-carbon system for the positive electrode and the negative electrode. In 2019, we are preparing to launch 280WH/KG to reach 300WH in 2020. /KG requirements.

　　Let me talk about this silicon anode. There are many studies on this. Now it is more difficult for graphite to reach the national requirement of 300-350WH/KG. Therefore, there are more researches on silicon anodes. We know that silicon has a great advantage in terms of passenger capacity. It is relatively high, about 10 times that of the conventional negative electrode. At the same time, the platform is also graphite paste. It has better safety performance than graphite. It has some fatal shortcomings. There is a 300% volume change during the process of removing lithium and inserting lithium. The volume change of graphite is about 10 or so, causing the active material to crack and pulverize, so there is a great difficulty for our battery. The problem of suppressing the volume expansion of the silicon negative electrode. What problems will the volume expansion cause? The material will be caused during the charging and changing cycle. The pulverization and shedding of the SEI film, and the formation of the SEI film and the impact on the electrolysis consumption, so how we now solve the problems in the application process of the silicon anode, mainly from two considerations, the first is the perspective of the material itself, This is a problem that materials manufacturers and battery manufacturers have to overcome together. Now we are making improvements in materials. From the point of view of material synthesis, the main route now is the nanometerization of silicon, which is mainly 0-dimensional, 1-dimensional, 2-dimensional, and 3-dimensional. The 0-dimension is mainly for nano particles, which must be made smaller, the 1st-dimension is for nanowires, the 2nd-dimension is nano-film, and the 3-dimension is porous structure.

　　The second is to do the packaging, which will cover the silicon carbon. The first is to leave some buffer for expansion, mainly to improve the conductivity of the lithium battery through some metal doping. From the perspective of the battery company, how to make good use of this material? How to use it in the battery well, there are some related matching connectors, how to suppress the expansion of silicon in the cycle? How do we tolerate the electrolysis in the process of the binder, how to reveal the impact of these negative electrodes, in Destruction and formation How do we find a good additive or solvent to form a more stable SEI film? During the cycle, the SEI film is more stable and will not break so severely.

　　The nanometerization of silicon is mainly mentioned from the above, from the perspective of 0-dimensional, 1-dimensional, and 2-dimensional. Among them, the most commonly used one is that many companies in the lower right corner use this method. The first is two. Cyclic silicon provides cushioning, forming a grape structure or pomegranate structure.

　　Then, in terms of the direction of the battery, it is mainly the adhesive and electrolyte. The most basic problem of the adhesive is the problem of electrical conductivity. How does the adhesive make the interface better? The interface of the electrode is our adhesive. How to increase the intensity. Here is how we choose a good binder? Make the silicon system have better performance during the battery operation, so that we choose the binder, first, it has better strength, and second The productivity modulus and fatigue resistance are better, and the affinity to the electrolyte is better. The conductive agent battery peels off during the cycle. We need to find a better conductive agent to form a better network. Many people mentioned carbon Now the best performance should be the single-arm carbon tube, because in all aspects of the conductive agent, the conductive agent will be connected to the role of the adhesive. Due to the length and diameter of the tube, the conductivity will be more complete, and the conductivity will be better in the end. . We use the results of the silicon anode to make a battery of 622 and silicon-carbon system. The energy density is about 264WH/KG, and the cycle is about 80% for one thousand weeks. There is a big problem with the battery. We have an additive that is very helpful for circulating silicon, but this will cause problems under high temperature reactions. This is a comparison of the performance of different electrolytes, and the performance of all aspects of the battery can be improved to a large extent through special additives. This is because we have chosen a lot of binders and finally the electrolysis has been greatly improved.

　　The last two points of view are that the material itself improves the effect and suppresses swelling. From the perspective of battery application, how to homogenize is solved. The second is how to make the material thinner according to the density requirement, how to solve the problem, and the structure design. How to determine the density and porosity, then the binder and conductivity, as well as the study of the electrolyte, and the study of the pre-reformation process.

　　Now let’s talk about the planning and production capacity. We have research institutes, systems research institutes, BMS research centers, and materials research institutes. At the same time, we are also equipped with a complete command center. In order to recycle the battery, a closed loop is created.

　　Our production capacity, now there are nine major bases in the country, last year was about 1.2GWH, last year's sales volume fifth. The main branches of our customers are located all over the country, mainly concentrated in East China, North China, and coastal areas. This is our customer branch. Thank you.