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Power battery density is expected to achieve 300Wh/kg by 2020.

2018-08-30(1352) Hits

  Recently, a seminar on "Grasp the global trend of change and achieve high-quality development" sponsored by the 100-member Electric Vehicle Association was held at Tsinghua University. Academician Ouyang Ming Gao attended the meeting and delivered a keynote speech entitled "Progress and Development Trend of Power Battery Technology 2017".

  Ouyang Minggao's speech centered on battery technology: "I now focus on three issues: battery, power consumption, charging. Battery is the key of component level and core technology level; power consumption is the core issue of vehicle integration technology; and charging technology is experiencing a period of great demand growth and technological development. Today I mainly talk about battery technology.

  First. Main technical progress of domestic power battery

  On the main technical progress of domestic power batteries, Ouyang Minggao said: "First, to industrialize the 300 watt-hour/kg battery monomer in 2020, has made substantive breakthroughs. For example, Ningde times, Tianjin Lishen and Guoxuan adopted the same technical route: the positive electrode is high nickel ternary, the negative electrode is silicon carbon negative electrode. A 300-watt-hour/kg battery unit could produce a 200-210-watt-hour/kg battery system, which is a significant improvement over the 150-watt-hour/kg battery system at the beginning of this year, with a single energy density of about 230 watt-hours/kg.

  "Second, for industrialization by 2025, we hope to achieve the target of 400 watt-hour/kg of impact cell energy density. At 300 watt-hours/kg, the anode is actually converted from carbon to silicon carbon, and at 400 watt-hours/kg it is the cathode material. There are several kinds of cathode materials available at present, and the breakthrough is the high capacity lithium-rich manganese-based cathode materials.

  "Third, the global battery industry in 2017 is a solid state battery. At present, there are many research institutions, industrial units and enterprises in China, and I take solid-state battery as an example to introduce the global power battery technology hotspot.

  Second: all solid state lithium battery

  About all-solid-state lithium batteries, Ouyang Minggao said: "All-solid-state lithium batteries, these six words each word can not change. The so-called "all-solid-state lithium battery" is a kind of lithium battery with solid electrodes and electrolyte materials used in the operating temperature range, and without any liquid components. It is called "all-solid-state electrolyte lithium battery". The all solid state lithium battery is also divided into all solid state lithium battery and all solid state lithium two battery. All solid state lithium two batteries are further divided into all solid state lithium ion batteries and lithium metal batteries.

  "It has both advantages and disadvantages. Advantages include high safety, high second energy density, wide selection range of the third cathode material, and high specific energy of the fourth system. The result is high.

  Ouyang Minggao then said: "There are breakthroughs, performance advantages and industrial prospects, mainly solid-state lithium-ion batteries. It differs from all solid-state lithium-ion batteries by not all solid-state electrolytes. The real solid-state lithium-ion batteries have solid electrolytes, but a small amount of liquid electrolytes in the cell. The quasi solid state is mainly solid and a small amount of liquid.

  Third: comprehensive review and Prospect

  Looking back on 2017, Ouyang Minggao summed up four points: "First, the lithium-ion power battery monomer is expected to achieve the goal of 300 watt-hour/kg by 2020. At present, the domestic and foreign technology research and development is basically at the same level, but the safety research needs to be strengthened. The core of this battery is safety. Secondly, the progress of lithium-sulfur battery and lithium-air battery is relatively slow at home and abroad, and there is no breakthrough in 2017.

  Thirdly, the industrialization of solid-state batteries continues to heat up, but the solid-solid interface stability and lithium metal anode rechargeability constraints, the real all-solid-state lithium metal anode batteries are not mature, but the inorganic sulfide as solid-state electrolyte lithium-ion batteries should say breakthroughs. Overall, solid-state battery development path: electrolytes may be from liquid, semi-solid, solid-liquid mixing to solid, and finally to all-solid. As for the negative electrode, it will be from graphite anode to silicon carbon anode, and eventually to lithium metal anode, but there are still technical uncertainties.

  Fourthly, innovative lithium-ion batteries based on high-capacity lithium-rich cathodes and high-capacity silicon-carbon cathodes are more feasible than lithium-sulfur and lithium-air batteries.

  Looking forward to the future, Ouyang Minggao on behalf of the expert group on battery technology development trends made a few judgments: "First, by 2020: battery energy density 300 watt-hour / kg, specific power 1000 watt-hour / kg, more than 1000 cycles, the cost of 0.8 yuan / watt-hour. The corresponding high nickel ternary cathode material will be changed from nickel: cobalt: manganese ratio 3:3 to 6:2:2 and finally 8:1:1. The corresponding negative electrode material will be changed from carbon negative electrode to silicon carbon negative electrode.

  "Second, by 2025: significant breakthroughs in lithium-rich manganese-based materials will further enhance their performance, from 300 watt-hour/kg of monomer density to 400 watt-hour/kg at a cost of less than 80 cents per watt-hour to less than 60 cents per watt-hour."

  "Third, by 2030, the major breakthrough may be the industrialization of solid battery scale. The cell specific energy density will be expected to hit 500 watts / kg. At that time, the conventional cost-effective model should be able to reach more than 500 kilometers, of course, this also requires power consumption, lightweight and other technologies.