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Radioisotope Battery Institute of nuclear physics chemistry Liu Yebing Presentation Outline Why choose nuclear batteries History Classification Progress of nuclear battery summary How to power the portable devices? Walkman/ MP3/ MP4 Cell phone Laptop External power Fuel Cells Chemical Batteries Radioisotopes battery Why choose nuclear batteries Definition convert energy from radioactive decay to electricity Virtue long life (space, pacemakers etc when recharging or refueling is difficult or hard) high energy density high reliable Many of the conversion technologies can function in harsh environments be very useful as onboard MEMS power sources No need watch on Scalability Shortfalls Comparison in energy density The history of nuclear battery International 1913: DCG (English physicist H.G.J Moseley’s) 1924: CPD 1950s: semi-conductor convert and other kinds of transform mechanism 1960s：RTG commission 1970s：Thermionic commission 1980s：nuclear pile as the (Radioisotope power system) RPSs source (kW)； 1987： Resonant nuclear battery( Paul. Brown) 1997：Multi-porous Silicon beta-voltaic NB conception About 2000: wide band gap semiconductor materials were used in PN junction 2004： Three dimensional porous Silicon beta-voltaic NB make great progress The focus Large radioisotope power systems for deep space investigation (thermal conversion) Static/MM-RTG Dynamic/stirling Milliwatt micro-nuclear battery for MEMS medical used (radio-voltaic) 3-D multi-porous silicon betavoltaic battery Wide band gap semiconductors as the PN junction material cantilever In our country 1967~1983: RTG prototype (1970s 210Po-RTG 2kg 1.4w η4.2% ) 1991: electromagnetic wave emit and collect conception nuclear battery design and theoretic calculation (Institute of neoteric physics of CAS Chinese Academy of Sciencer) 2000: plan to study the space nuclear power system(No.5 institute of space investigation ，Shanghai