Traditional batteries stored energy in thick plates made from heavy metals like lead nickel, and zinc. They delivered from 15 to 20 Wh/kg. Lighter-weight lithium anodes were used in some mili- tary batteries. Then came the need for lightweight batteries for powering cellu- lar telephones and laptop computers. Lithium-ion batteries were developed, And the worldwide demand, just for use In laptop computers, has grown to 150 million units per year.
展开▼