902030 polymer battery.Matching of new high-safety, high-voltage resistant electrolytes and other lithium battery materials

　　High-specific energy power lithium battery cathode materials, new high-safety, high-voltage resistant electrolytes and other matching lithium battery materials will play a positive role in promoting the industrialization of high-specific energy single batteries above 300Wh/kg. Prior to this, many battery companies including Guoxuan Hi-Tech, Lishen Battery, CATL, etc. also developed 300wh/kg high specific energy battery samples. Specifically, almost all of the above-mentioned battery companies use a material system of high nickel positive electrode + silicon carbon negative electrode, and develop a new high-voltage electrolyte to solve the problem of low internal expansion cycle life of the battery. They adopt the soft package technology route, thus developing a 300wh /kg of single cell. In fact, under the guidance of subsidy policies, the energy density of domestic power batteries has increased rapidly in the past two years. The specific energy of lithium iron phosphate battery cells reaches an average of 160wh/kg, and the system energy density is about 140wh/kg; the specific energy of ternary battery cells is about 220-240wh/kg, and the system energy density is about 140-160wh/kg. In 2019, the energy density of power batteries will continue to rise. The mass-produced lithium iron phosphate battery is expected to reach 190wh/kg, and the system is 160wh/kg; the high specific energy ternary battery cell can reach 260wh/kg, and the system can reach more than 180wh/kg. Judging from the current upward trend in power battery energy density, power batteries with a single capacity of 300wh/kg are expected to achieve industrial application in 2020, but the scale will not be too large. Since high-nickel batteries still face problems such as immature high-nickel materials, manufacturing processes that need to be improved, and imperfect cooperation in the industrial chain, there is still a certain distance between them and large-scale mass production applications. At the same time, as the energy density of power batteries continues to increase, the safety, consistency and reliability of batteries have become looser. If the energy density is increased at the expense of battery safety and cycle life, it may cause a series of safety accidents, which will have a fatal blow to the new energy vehicle industry. Therefore, both OEMs and battery manufacturers are currently discussing the energy density level of power batteries in 2019, and it is generally believed that it is not appropriate to blindly increase it. Instead, we need to carry out diversified development and design on the basis of ensuring battery safety, give full play to the performance advantages of lithium iron phosphate and ternary batteries, and enhance the product competitiveness of electric vehicles. Let’s take a look at the new technologies and major events in the lithium battery industry this week. 1. Disruptive innovation in the United States contributes to breakthroughs in lithium battery technology. A report on the development of the global lithium battery industry released by the German Fraunhofer Association for Applied Research specifically mentioned the disruptive innovation in the R&D and industrial fields of the United States, that is, achieving Technology that offers a significant improvement in at least one performance parameter, such as energy density, over existing lithium-ion batteries. Starting this year, several start-ups including SilaNanotechnologies, SolidPower, QuantumScape and others will bring their batteries to the commercial market. Gene Berdichevsky, CEO of Sila Nanotechnologies, said: "It took us 8 years and about 35,000 material synthesis before we had something commercial." Sila Nanotechnologies has previously received US$70 million in D from world-renowned companies such as Siemens. This round of financing will be used to continue to fine-tune battery technology and build its first commercial production line for silicon anode batteries. One of Sila's current automotive partners is BMW. Comment: There is no shortage of innovative lithium battery technologies in the laboratory, such as lithium-air batteries, graphene batteries and all-solid-state batteries. However, judging from the existing technology, the industrialization time of the above-mentioned new battery technology is still far away, mainly because the preparation technology of raw materials is not yet mature and the cost of battery manufacturing is difficult to reduce. Lithium-ion batteries are still a relatively mature and reliable solution. 2. Power batteries will be included in the "Three Guarantees" for electric vehicles. On March 14, the "Regulations on Responsibilities for Repair, Replacement, and Return of Household Automobile Products (Revised Draft for Comments)" (hereinafter referred to as the "Revised Draft of "Three Guarantees for Automobiles")" was published by the Ministry of Justice China The Government Legal Information Network and the State Administration for Market Regulation website were simultaneously released to solicit opinions from the whole society. Any unit or individual can give feedback to the State Administration for Market Regulation through the Internet, email, letter, etc. before April 13. This revised version of the "Three Guarantees for Cars" supplements and improves the "Three Guarantees" responsibilities for household electric vehicles: 1) The power battery and driving motor will be included in the free replacement assembly as the main systems of household vehicles in parallel with the engine and transmission. stipulates the scope; 2) Incorporate recurring quality problems of power batteries, driving motors and their main parts into the return and exchange terms; 3) Require manufacturers to express the power battery discharge capacity attenuation limit and corresponding test methods on the "Three Guarantees" certificate Above; the failure of the power battery of household electric vehicles to catch fire has been added to the terms of vehicle return and exchange. 4) This regulation applies to the power battery and driving motor in gasoline-electric hybrid vehicles. Hydrogen energy and other new energy vehicles have not yet been launched in batches, and this revision does not involve relevant content for the time being. At the same time, the revised "Three Guarantees for Automobiles" further strengthens the protection of consumers' legitimate rights and interests. In response to the current problem of high usage compensation fees for consumers to return or exchange cars, through comparative study of similar foreign regulations and calculations, the usage compensation coefficient n was adjusted from 0.5% to 0.8% in the current "Three Guarantees for Cars" to an upper limit of no more than 0.7 %, the lower limit is not capped. Considering that the current "Three Guarantees" start date is calculated from the date of issuance of the car purchase invoice, and in actual sales activities, there are cases where the product is delivered to consumers later than the invoice issuance date, for this reason, the "Three Guarantees" will be calculated from the actual delivery date. deadline provisions. Comment: Currently, due to a series of immature and imperfect reasons such as lithium battery technology, three-power systems and charging networks, electric vehicles have a series of quality problems, and the quality problems of power batteries are particularly prominent. This time, the inclusion of power batteries in the "three guarantees" for electric vehicles provides consumers with a guarantee, and also puts a hoop in the OEM and battery factories to prevent consumers' rights and interests from being infringed. 3. Ningde era uses interface film coating to solve the problem of silicon carbon hardness. Silicon-based materials are regarded as the next generation materials to replace graphite. According to calculations, the specific capacity of silicon-based negative electrode materials can reach 10 times that of graphite negative electrodes, and are regarded as The latter's "replacement". The application of traditional silicon-based materials mainly uses carbon coating technology, which is to compound a layer of carbon material on the surface of silicon materials. However, since the volume of the silicon material changes up to 300% during the charge and discharge process, the surface-coated carbon material will break and fall off after multiple cycles, and the protective effect on the silicon material will be greatly weakened, resulting in poor battery cycle performance. Wu Kai, chief scientist of CATL, introduced that CATL has abandoned traditional carbon coating technology and turned to research on artificial electrolyte interface film coating technology. It took more than 2 years to apply this technology to the preparation of silicon materials, and developed a new artificial electrolyte interface film-coated silicon-carbon composite anode material with independent intellectual property rights. Its cycle performance is significantly better than that of foreign products. “Compared with carbon materials, the artificial electrolyte interface film has stronger binding force with silicon materials, better elasticity, is not easily broken or pulverized, and plays a very good protective role for silicon materials, so it can greatly increase the silicon content during cycles. Interface stability of the material, thereby improving the cycle life of the battery." Comment: Based on this technology, CATL has taken the lead in developing a battery sample with a specific energy (mass energy density) of 304Wh/kg, which shows that it uses an artificial electrolyte interface film Coating technology solves the expansion problem of silicon carbon materials to a certain extent. This move will promote the country's full mastery of core technologies such as material modification and precursor synthesis, realize the localization of key material technologies, and provide an important guarantee for the gradual commercialization and application of silicon-carbon composite anodes.

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