Ni-MH battery pack

　　Main technological progress of domestic power Ni-MH battery pack

　　Ouyang Minggao's speech mainly revolved around battery technology: "I am now focusing on three issues: battery, power consumption, and charging. Ni-MH battery pack are the key to the component level and core technology level; power consumption is the core issue of the current vehicle integration technology; and charging technology is experiencing a period of great demand growth and technological development. Today I will mainly talk about battery technology."

　　1: Main technological progress of domestic power Ni-MH battery pack

　　Regarding the main technological progress of domestic power Ni-MH battery pack, Ouyang Minggao said: "First, the 300 watt-hour/kilogram battery cell to be industrialized in 2020 has made substantial breakthroughs. The technical routes adopted by CATL, Tianjin Lishen and Guoxuan High-tech are similar: the positive electrode is high-nickel ternary, and the negative electrode is silicon-carbon negative electrode. The 300 watt-hour/kilogram battery cell can produce a battery system of about 200-210 watt-hour/kilogram, which is a great improvement compared with the energy density of about 230 watt-hour/kilogram of the single cell and about 150 watt-hour/kilogram of the battery system at the beginning of this year."

　　"Second, we hope to achieve the goal of 400 Wh/kg of energy density for battery cells in 2025. At present, the goal of 300 Wh/kg is to change the negative electrode from carbon to silicon-carbon, and the positive electrode material needs to be changed to reach 400 Wh/kg. There are several types of positive electrode materials available, and the breakthrough is the high-capacity lithium-rich manganese-based positive electrode material."

　　"Third, the hottest battery in the global battery field in 2017 is solid-state Ni-MH battery pack. There are currently many research institutions, industrial units and enterprises in China working on it. Now I will take solid-state Ni-MH battery pack as an example to introduce the global hot spots in power battery technology."

　　2: All-solid-state lithium battery

　　Regarding all-solid-state lithium battery, Ouyang Minggao introduced: "All-solid-state lithium battery, each of these six words cannot be changed. The so-called "all-solid-state lithium battery" is a lithium battery in which the electrodes and electrolyte materials used in the working temperature range are solid and do not contain any liquid components. The full name is "all-solid-state electrolyte lithium battery". This all-solid-state lithium battery is divided into all-solid-state lithium primary battery and all-solid-state lithium secondary battery. All-solid-state lithium secondary battery is further divided into all-solid-state lithium ion battery and lithium metal battery".

　　"It has advantages and disadvantages. In terms of advantages, first, high safety, second, high energy density, third, wide range of positive electrode material selection, and fourth, high system specific energy; in terms of disadvantages, first, the ion conductivity of solid electrolyte materials is low, second, the solid/solid interface contact and stability are poor, third, the rechargeability of metal lithium, and fourth, the high manufacturing cost".

　　Then, Ouyang Minggao said: "At present, the main breakthroughs, performance advantages and industrialization prospects are solid-state lithium-ion Ni-MH battery pack. The difference between it and all-solid-state lithium Ni-MH battery pack is that not all of them are solid electrolytes. The real solid-state lithium-ion battery has a solid electrolyte, but there is a small amount of liquid electrolyte in the battery cell; the so-called semi-solid state means that the solid electrolyte and the liquid electrolyte each account for half, or half of the battery cell is solid and half is liquid; the quasi-solid state is mainly solid and a small amount is liquid."

　　Three: Comprehensive review and outlook

　　Looking back at 2017, Ouyang Minggao summarized four points: "First, lithium-ion power battery monomers are expected to achieve the 300 watt-hour/kilogram target by 2020. At present, domestic and foreign technology research and development are basically at the same level, but safety research needs to be strengthened. The core of this battery is safety. Second, with regard to lithium-sulfur Ni-MH battery pack and lithium-air Ni-MH battery pack, the current progress at home and abroad is relatively slow, and no breakthrough progress was seen in 2017.

　　Third, the research and development and industrialization of solid-state Ni-MH battery pack continue to heat up, but are affected by the stability of the solid/solid interface and the rechargeability of the metal lithium negative electrode. Due to the constraints of the two major problems, the real all-solid-state lithium metal anode battery has not yet matured, but the lithium-ion battery with inorganic sulfide as solid electrolyte should be said to have a breakthrough. Overall, the path of solid-state battery development: the electrolyte may be from liquid, semi-solid, solid-liquid mixture to solid, and finally to all-solid. As for the anode, it will be from graphite anode, to silicon-carbon anode, and finally to metal lithium anode, but there is still technical uncertainty. Fourth, the innovative lithium-ion battery based on high-capacity lithium-rich cathode and high-capacity silicon-carbon anode is more feasible than lithium-sulfur and lithium-air Ni-MH battery pack."

　　Looking ahead, Ouyang Minggao, on behalf of the expert group, made several judgments on the development trend of battery technology: "First, by 2020: the energy density of battery cells will be 300 Wh/kg, the specific power will be 1000 Wh/kg, the cycle will be more than 1000 times, and the cost will be less than 0.8 yuan/Wh. The corresponding positive high-nickel ternary material will change from the nickel: cobalt: manganese ratio of 3:3:3 to 6:2:2 and finally to 8:1:1, and the corresponding negative electrode material will transform from carbon negative electrode to silicon-carbon negative electrode."

　　"Second, by 2025: the lithium-rich manganese-based materials that have made important breakthroughs will further improve their performance, from a cell density of 300 Wh/kg to 400 Wh/kg, and the cost per Wh will change from less than 80 cents to less than 60 cents."

　　"Third, by 2030: the biggest breakthrough may be the large-scale industrialization of solid-state Ni-MH battery pack. The energy density of battery cells will be expected to reach 500 watt-hours/kilogram. By then, conventional cost-effective car models should be able to achieve a range of more than 500 kilometers. Of course, this also requires the cooperation of other technologies such as power consumption and lightweighting."

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