Lithium-Air Battery Progress is Breathtaking
S
cientists at UK’s University of Cambridge have devel- oped a working laboratory demonstrator of a lithium-ox- ygen battery that has very high energy density, is more than 90% effi cient, and, to date, can be recharged more than 2000 times, showing how several of the problems holding back the development of these devices could be solved. Lithium-oxygen, or lithium-air, batteries have a theoretical energy density that’s ten times that of a lithium-ion battery. Such a high energy density would be comparable to that of gasoline–and would enable an electric car with a battery that is a fi fth the cost and a fi fth the weight of those currently on the market to drive over 400 miles on a single charge—theoretical- ly, that is. However, as is the case with other next-generation batteries, there are several practical challenges that need to be addressed before lithium-air batteries become a viable alterna- tive to gasoline.
Microscope image showing charged (left) and discharged graphene electrodes.
University of Cambridge researchers have now demon- strated how some of these obstacles may be overcome, and developed a lab-based demonstrator of a lithium-oxygen battery which has higher capacity, increased energy ef- fi ciency and improved stability over previous attempts. Their research was published in the journal Science. What Tao Liu, Clare Grey and their colleagues at Cam- bridge have developed uses a different chemistry than earlier attempts at a nonaqueous lithium-air battery, relying on lithium hydroxide (LiOH) instead of lithium peroxide (Li2
O2 ).
With the addition of water and the use of lithium iodide as a ‘mediator’, their battery showed far less of the chemical
G-925 and GA5026
Carbide inserts that bring high wear resistance to high- speed machining of abrasive and difficult-to-machine materials including high-temp alloys, titanium and stainless steels.
Finish with TurboForm® Inserts
TurboForm® carbide inserts with built-in chip control are ideal for precision finishing of thin wall sections. The high positive-rake cutting edges of these precision-ground, negative-style inserts minimize tool deflection for a truly superior and accurate surface finish.
For more information visit
www.greenleafcorporation.com/turboform
18695 Greenleaf Drive, PO Box 1040, Saegertown, PA 16433 U.S.A. Ph: 1-800-458-1850 | 1-814-763-2915 | Fax: 1-814-763-4423
Greenleaf Corporation is ISO 9001 Certified.
Image courtesy University of Cambridge
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116