Battery "davos" - network October 28 - (Chen The investigation Changsha ningxiang direct seeding) "solid state battery technology, especially the all solid state battery technology is still facing many technical challenges, including solid solid interface problems, such as high performance battery materials development and engineering", who blue new energy technology co., LTD., vice general manager of Beijing to jin, "mixed solid liquid battery scale production is expected to be in 5 years, solid-state batteries is expected in the commercial application of five to 10 years."
October 27-29, the annual global event -- ABEC 2020 | the 8th Chinese battery industry, ningxiang (changsha) international battery of new energy industry peak BBS ningxiang grandly held in changsha. The BBS by ABEC (battery "davos"), the organizing committee, zhongguancun new battery technology innovation alliance, ningxiang exclusive sponsor in the zone and more than 500 from the global battery of new energy industry chain "policy, production, study and research, gold, and with" and media representatives from all circles to attend, in the new energy battery competition under the background of globalization, explore the upward path independent brands, GongYi industry the way of the construction of a healthy ecosystem.
BBS in the same period, by the ministry of industry and information office of hunan province, sponsored by the department of commerce, people's government of changsha city of hunan province, hunan (changsha) battery industry exposition 2020 grand opening, the exhibition area of 20000 square meters, is focused on the industry cutting-edge products, technology, service, brings together the byd, baic, new energy, new energy, chery lishen battery, we have pleasure in wanda, general electric, the division in star city, warburg energy storage, fluorine, Shi Dasheng China family, gold and silver river, laser, Mr Ottaway, five-star aluminium nearly 200 battery quality exhibitors of new energy industry chain.
On the morning of the 28th, Xiang Jin made a keynote speech entitled "Some Thoughts on the Industrialization of Solid State Battery" at the forum. He shared the opportunities and challenges of Solid State Battery, design and manufacturing, and the construction of standard system, etc., and selected some of his wonderful views for the readers.
To introduce jin, at present, liquid lithium ion battery is SEI continued growth and reaction, formation of lithium, lithium and death within a short circuit, the positive transition metal dissolved oxygen, the positive analysis, particle volume change and electrode, electrolyte of high voltage, large by oxidation, electrolytic liquid drained, bilge gas corrosion, high temperature storage and running performance attenuation, aluminum foil, copper foil, oxidation, thermal runaway free metal content requirements in PPB level, to process complex, electrode plate and diaphragm tension control demands high, plate alignment degree is high.
In the short term, the above problems can be through the anode material modification, anode materials modification, up for anode materials, ceramic coated membrane, a new diaphragm, flame retardant electrolyte, SEI/CEI control, pre lithium technology, prevent overcharge additives, adhesives optimization, pole piece structure optimization, hot composite technology, the design optimization of batteries, reduce pollution, high precision manufacture and so on ways to improve the performance of batteries.
In the long term, solid-state batteries promise to solve these common problems of liquid lithium-ion batteries. All solid-state batteries have higher high temperature resistance due to their inner series, no need for welding fluid collector, and can reduce the series of the system. Compared with liquid batteries, the volume ratio of energy in each stage of pole plate, cell and group has been greatly improved, and the overall increase can reach more than 60%. "In terms of liquid batteries and energy density, people think 350 Wh /kg is the accepted ceiling. For the relatively mature semi-solid battery in the industry, its energy density can be improved from the current 260 Wh /kg to 400 Wh /kg or even 500 Wh /kg in the future. Of course, all solid-state batteries, which are much safer, have reached 600 Wh /kg, and there is potential for much more in the future." To the jin said.
The industrialization of solid-state batteries also faces many challenges, such as effectively solving interface problems, developing high-performance solid-state electrolyte materials, and developing high-specific energy anode and cathode materials, Xiang said. In addition to the improvement of comprehensive performance, solid electrolyte materials also put forward more stringent requirements for production process, cost and quality control.
According to Xiang Jin, solid-state battery mass production is marked by the completion of cell design and process verification; All materials have entered the stage of mass production; It can support mass production after commissioning of manufacturing equipment. BMS and battery pack design finalization; The customer has completed the battery pack A, B, C sample testing stage, entered SOP6 cost accounting completed and competitive; Establish a standardized manufacturing system; Factory design finalization; Supply chain initial formation; Passing national standard test and forming new national standard; Relative to liquid electrolyte lithium ion battery products are competitive.
Among them, the factors that affect the mass production of solid-state batteries include: the understanding of key basic scientific issues is not comprehensive enough; The structure-activity relationship between material and core is not fully understood. Shortcomings in some performance; The development of all solid-state batteries is still in the pilot stage of small-scale production; New processes and equipment need to be further developed; And the existing most advanced technology benchmarking performance has no advantage; The cost is relatively high; The large-scale raw materials and industrial manufacturing system has not yet been formed.
At the forum, Xiang Jin also focused on introducing the new technology of solid-state batteries. In his view, polymer solid state battery, sulfide solid state battery and oxide solid state battery manufacturing process route is not the same, dry mixing, dry electrode technology and thermal composite technology is the future trend. Among them, the dry electrode technology that has attracted much attention is to directly bond a small amount of adhesive and conductive agent with positive/negative electrode powder without using solvent, form a thin electrode material belt through the extruder, and then laminate the electrode material belt to the metal foil collector to form the finished electrode. And hot composite technology has been used in the traditional liquid battery, currently with 590 module or more modules are widely used, in order to reduce the large size batteries in the subsequent laminated and dislocation core in the process of turning, and improve the qualified rate of battery in the process of production, while increasing the yield of the battery in the process of PACK, each battery manufacturer in develop these composite technology.
In addition, about the construction of the solid-state batteries standard system, to jin said the liquid battery standardization starts late, solid-state batteries cannot leave liquid battery, solid-state batteries standardization is of great significance, the development of industry, scale manufacturing, recovery phase, and in the electric has great significance, such as the design of the solid-state batteries and battery liquid and the performance difference is bigger, so the relevant standard system needs further study.
