How to break through the power lithium ion battery material under the new situation?

　　Author ：Iflowpower – Portable Power Station Supplier

On May 14th, 2017 my country (Yima) Lithium Electric Material Industry and Technology Development Forum How to adapt to new trends, and how to grasp investment opportunities in the power lithium-ion battery. Expertists from New Energy Motors, Research Institutes, and Industry Association brought audio-visual feast for the representatives. The power lithium-ion battery market increased by 50% in the future.

"Four high one drop" Chengdu Yajun New Energy Automobile Technology Co., Ltd. Deputy Minister Chen Keyu pointed out that new energy vehicle power lithium-ion batteries face battery price during use High, the charging time is too long, the battery life is short, the environment is poor, and the service life is short.

Therefore, new energy vehicles put forward new development needs for lithium-ion batteries: First, improve high temperature, low temperature, charging, discharge consistency. Second, high charging ratio is achieved by battery design and material improvement. The third is to improve the energy density.

It is important to optimize the electrode structure, optimize the electrode structure, improve the active material load; apply a new material system, improve the battery operating voltage; optimize the new material system, use the new battery structure and other ways to achieve. The fourth is to improve safety, especially under extreme conditions. 5 is to reduce costs.

Sixth is to pay attention to battery secondary recycling. Liu Yanlong, deputy director of Chengdu Yajun New Energy Automobile Technology Co., Ltd.

, my country Chemistry and Physical Power Industry Association, said Liu Yanlong, said that the annual average increase of lithium-ion battery market for new energy vehicles in the next five years is about 50%. Progress of lithium-ion battery technology, important research and application of key battery materials innovation, further improve battery performance, improve quality, reduce cost, improve safety through new materials. Liu Yanlong pointed out that the lithium-ion battery electrolyte and diaphragm on the improvement of battery performance and safety have become important, and the electrolyte additive and diaphragm coating are combined with lithium-ion batteries to increase voltage (lifting energy density), maintain life and safe safety.

Important measures. In the field of battery electrolyte, we should focus around the functional electrolyte, the choice of additives is the focus of today's electrolyte research. Especially in the new type of electrolyte system (containing solvent, solute and additive), a functional electrolyte (containing additive) suitable for high nickel NCM power lithium ion batteries is suitable for electrolytes in the energy storage battery (especially additives), low temperature electrolytes, high temperatures.

Type (150 degrees Celsius) and flame retardant electrolyte. The coating (or compound) diaphragm is the focus of the development of the diaphragm application, and the surface of the diaphragm is coated, and the thermal stability of the diaphragm can be improved; the second is to improve the infiltration of the electrolyte to the electrolyte, which is advantageous for the battery The resistance is lowered, the discharge power is improved; the third is that the coating can prevent or reduce the oxidation of the diaphragm, which is conducive to the operation of the high voltage positive electrode and extend the battery cycle life. Liu Yanlong, secretary-general of my country's Chemistry and Physical Power Industry Association, replaces the import of climax, and the deputy secretary general of my country's Plastic Processing Industry Association, Sun Dongquan, Secretary-General of my country's Plastic Concord Battery Differential Committee, pointed out that as the world's largest lithium ion battery Country of manufacture, my country's demand for diaphragm is increasing.

In recent years, the annual increase rate in the domestic diaphragm market is generally lower than the increase rate of domestic separators, indicating that the market share of domestic separators is constantly rising, and the differential drain is a general trend. Deputy Secretary-General of my country's Plastic Processing Industry Association, Sun Dongquan, Secretary-General of my country's Plastic Cooperation Battery Differential Committee, Overcome, my country's lithium battery compact membrane low-end market production, product prices continue to decline, long accounts, but new investment projects are still in source Ground horse, disorderly competition plus. Although the import of high-end products is shrinking, the gap between domestic diaphragm companies and foreign leadership companies is still large.

It is expected that domestic high-end markets in China in 2017 to 2018 will have a climax. In 2019, there will be a small amount of imports, and more than 80% of the diaphragm will realize localization. Sun Dongquan pointed out that the performance indicators of raw materials such as PP or PE resin have huge impact on the performance of the diaphragm.

The domestic diaphragm company lacks the source of stable diaphragm specializes in the material to meet demand, and the product development is far away. In terms of dry method, Sinopec Beijing Institute of Chemical Technology has developed specialized for domestic lithium-ion battery diaphragms. It has been put into application in diaphragm companies; special materials for wet method, Sinopec Shanghai Petrochemical Research Institute is developing wet lithium-ion battery diaphragm special materials In the future, it will also be promoted.

In terms of improving diaphragm performance, there are currently three ideas: one is newly added functional coatings on the basis of PP film and PE film to meet special needs such as high temperature characteristics; the other is to develop inorganic or organic materials total mixed PE, PP The film; the third is to thoroughly change the matrix material, such as material using polyimide and other materials instead of conventional PP and PE materials. Zeng Songjun, the customer manager of my country Petrochemical Sales Co., Ltd.

Huazhong Branch, pointed out that my country's PP membrane is more than 3.6 million tons, and the electrical membrane is not large compared with the packaging film, but it is related to a high-tech product product. Very considerable.

Many domestic companies have developed and produce low-end working materials, but with the downstream users' requirements for battery, capacitors, the demand for low-end products has dropped to about 20%, and many companies are due to technical and market capacity. Cause, gradually abandon the research and development and production of polypropylene capacitor film raw materials. The wet separator has always been used as a raw material using ultra-high molecular weight polyethylene (can be as low as 5 microns), the intensity is higher, more suitable for high energy density batteries.

However, in fact, relevant companies can also consider the PP raw materials, so that the dry diaphragm can also be more thinner and safer while ensuring higher strength. my country Petrochemical Sales Co., Ltd.

Huazhong Branch Account Manager Zeng Songjun and representatives also discussed new technological trends in lithium battery compact membranes. Wu Yuping, specialty professor, vice president of the Energy College of Nanjing University of Technology, introduced the gelation trend of lithium electric diaphragm, Henan Yi Tengxin Energy Technology Co., Ltd.

Technology Zhou Yuzhen introduced the technical design of lithium-ion battery diaphragm technology Trend Electrode Material Design Considering Integrated Factor Zhongnan University Professor Hu Guorong, a light metal and industrial electrochemistry research institute, pointed out that the research and development of positive material materials has become the key to constrained large-scale promotion applications of such materials. In 2000, there was a single collar of cobalt-cobalt, almost 100% of the market. After 2000, lithium manganate, ternary and lithium iron phosphate positive materials began to develop.

At present, there is about 40% of the market, and the three yuan system accounts for about 35%, and the rest is lithium manganate, lithium iron phosphate and binary. NCA). Materials for further development in the future, there is an important lithium-rich manganese-rich solid solution material, phosphate lithium phosphate, phosphate iron, phosphate graphene composite material.

The lithium manganate and lithium iron phosphate is important to the field of large energy storage and power lithium-ion battery; due to the improvement of lithium-ion battery manufacturing and the supply of lithium-ion batteries on energy density, the ternary material is currently used in power lithium ions. Battery field. Therefore, the three-yuan materials have a good application in the future two markets, and its market prospects will occupy the largest market share of the positive material.

However, due to the ternary NCA, NCM is limited by nickel-cobalt resource limit, and the nickel-cobalt recovery problem in ternary material batteries must be solved. President of the School of Metallurgy and Environment, Central South University The first element of the new energy vehicle power lithium-ion battery design Beijing Petrochemical University Professor, Beijing Chemical Technology Mao Cui Xiuxi, introduced black phosphorus (ethylene) in secondary ion battery, the apprentice of the Institute of Electrical Engineering, my country Glosene Ethylene in the lithium ion battery focuses on five major issues my country University of Petroleum (Beijing) New Energy Research Institute, Sun Hui, my country University of Petroleum (Beijing) New Energy Research Institute, He pointed out that the future development of lithium-ion battery electrolytes Solve the following question: First, the safety of electrolyte and battery. It can be solved by ionic liquid, fluorocarbonate, adding supercharged additive, flame retardant, using high stability lithium salt to solve.

The second is to improve the working voltage of the electrolyte. It can be solved by purifying a solvent, an ionic liquid, a fluorocarbonate, adding a positive surface film additive or the like. The third is to broaden the operating temperature range.

The low temperature electrolyte system should use a lower melting point of an ether and a nitrile system; a high temperature should be used to improve the ionic liquid (molten salt), the new lithium salt, fluoroate ether. Fourth, extend battery life. To accurately regulate the composition and structure of the solid electrolyte membrane (SEI film), it is important to achieve the SEI film forming additive, free transition metal ion capture, etc.

5 is to reduce costs. To reduce the cost of lithium salts and solvents, how to improve the technical problems of battery performance when the lithium salt and solvent is low, and now we still have to study. Everbright Securities Petrochemical Researcher Chen Guanxiong analyzed the investment opportunity of lithium-ion battery materials.