Taw qhia txog lithium hlau phosphate roj teeb

Nyob rau hauv cov qauv siv lead ua ntawm LiFePO4, oxygen atoms nruj nreem ntim rau hauv hexagonal kev npaj. Lub PO43 tetrahedron thiab FeO6 octahedron tsim cov pob txha pob txha ntawm cov siv lead ua, nrog Li thiab Fe tuav lub octahedral voids, thaum P tuav lub tetrahedral voids, qhov twg Fe occupies co angular txoj hauj lwm ntawm lub ntug ntawm lub octahedron positioned. . Lub FeO6 octahedra yog interconnected ntawm lub dav hlau bc ntawm cov siv lead ua, thaum lub LiO6 octahedra qauv nyob rau hauv lub b-axis kev taw qhia yog interconnected rau hauv ib tug saw zoo li qauv. 1 FeO6 octahedron coexists nrog 2 LiO6 octahedrons thiab 1 PO43 tetrahedron. [3]
Vim qhov tsis sib xws ntawm FeO6 co octahedral network, hluav taws xob conductivity tsis tuaj yeem tsim; Nyob rau tib lub sijhawm, PO43 tetrahedron txwv qhov ntim hloov ntawm lub lattice, cuam tshuam rau de embedding thiab electron diffusion ntawm Li ntxiv, uas ua rau tsis tshua muaj hluav taws xob conductivity thiab ion diffusion efficiency ntawm LiFePO4 cathode khoom. [3]
Lub peev xwm theoretical tshwj xeeb ntawm LiFePO4 roj teeb yog qhov siab (kwv yees li 170mAh / g), thiab lub platform tso tawm yog 3.4V. Li ntxiv tau dhau los ua tus txheej txheem tawm los ntawm kev tshem tawm thiab muab nws rov qab los ntawm qhov zoo thiab tsis zoo electrodes. Thaum lub sij hawm them nyiaj, cov tshuaj tiv thaiv oxidation tshwm sim, qhov twg Li ntxiv migrates ntawm qhov zoo electrode thiab yog embedded rau hauv qhov tsis zoo electrode los ntawm electrolyte. Hlau hloov los ntawm Fe2 ntxiv rau Fe3 ntxiv, ua rau muaj kev cuam tshuam oxidation.