Chinese scientists have invented a lithium battery that can be used at minus 70 degrees.
News for March 1 , Chinese scientists have developed a lithium battery that can be used at minus 70 degrees Celsius and is expected to be used in extremely cold areas of the Earth and even in space in the future.
Research published in the latest issue of the American academic energy journal "Joule" shows that the new battery developed by Xia Yongyao's team at Fudan University in China uses energy Ethyl acetate has a low freezing point and can conduct electricity under extremely low temperature conditions. As the electrolyte, two organic compounds are used as electrodes, namely the PTPAn cathode and the PNTCDA anode.
The electrolyte is a chemical medium allowing ions to move betweene both electrodes, but the electrochemical reaction at the interface between the electrolyte and the electrodes is difficult to maintain under low temperature conditions.
The researchers said that unlike the electrodes used in traditional lithium batteries, the organic compounds used in this electrode do not rely on the "incorporation process", i.e. they do not need to incorporate lithium ions into the molecular matrix of the electrode, thus avoiding the need for the integration process to slow down at low temperatures.
Xia Yongyao said: “Ethyl acetate electrolyte and organic polymer electrodes enable rechargeable batteries to operate at extremely low temperatures of minus 70 degrees Celsius.”
Traditional lithium batteries are used in performance. is only 50% of its optimal level at minus 20 degrees Celsius, and only 12% of sthe optimal level is minus 40 degrees Celsius. In extremely cold regions like Russia and Canada, the temperature in space is below minus 50 degrees Celsius; the temperature even reaches minus 157 degrees Celsius.
Xia Yongyao said that compared with the electrode materials of traditional lithium batteries, the materials of new batteries are abundant, cheap and environmentally friendly. He expects the price of this material to be only about a third of the price. ancient.
However, the researchers admit that the main production challenge is that the energy per unit mass of this battery is not as good as that of commercial lithium batteries, and that the process of production must be optimized. However, Xia Yongyao believes that it has significant application potential.
DELL-700m 1.7G/512/80/combo laptop
Basic parameters
Inspiron model700M (M520814)
< p>Intel Pentium M (Dothan) 735 (1.7G) processorMaximum processor frequency 1700 MHz
Level 2 cache 2048 KB L2
400 MHz system bus
Motherboard chipset Intel 855GME
Memory capacity 512 MB
Memory type DDR333
Maximum memory supported 2G
storage device
Hard disk type ATA-100
Hard disk parameters 5400 rpm
Hard disk capacity 80G
Built-in optical drive type, COMBO
< p> Floppy disk drive No floppy disk driveDisplay < /p>
Screen size 12.1 inches
Display type WXGA
Display Performance widescreen, resolution 1280 x 800 Rate
< p> Audio videoIntegrated display chip Intel Extreme2 chip
Dynamically shared video memory capacity 64MB memory
Audio System motherboard Integrated AC97 chip < /p>
2-channel speaker
Communication
56K MODEM
Built-in 10-100M network card< /p>
Wireless communication 802.11 b Wireless network card
Input and output
Mouse replacement device touch pad< /p>
USB 2, USB2.0
PCMCIA Card/Express Card 1, Type II
Built-in card reader, SD
Other interfaces : 1 IEEE1394a, S-VIDEO interface, RJ11, RJ45, microphone, sound output hole, AC power jack
Structural characteristics
Weight about 1.86 kg
Specifications 297.2 x 215.9 x 38.1 mm
Electric energy specifications
Battery type 4-cell lithium-ion battery
Battery life 2.5 hours
Others
DOS operating system No pre-factory - installed (English)
Warranty duration and method Warranty 'one year
I don't know if yours is correct, but the sound card is AC97. You can download its driver. from any website. Of course you can also access the official websiteiel from DEll to download the driver
Inspiron 700m / Microsoft Windows XP / Chinese-S Driver Download
http:/. /support.ap.dell.com/support/downloads/devices.aspx?c=cn&l= zh&s=gen&SystemID=INS_PNT_PM_700M&os=WW1&osl=CS Just open it directly