Yintoni ukuchasana kwangaphakathi kwebhetri ye-lithium?
Xa umsinga utyhutyha ngaphakathi ebhetrini, idibana noxhathiso, nto leyo ebangela ukuncipha kwamandla ombane ebhetri. Oku kuxhathisa kubizwa ngokuba kukuxhathisa kwangaphakathi kwebhetri. Ngenxa yokunganyangeki kwebhetri ngaphakathi, amandla ombane etheminali angaphantsi kwamandla e-electromotive kwaye avule-amandla ombane wokujikeleza ngexesha lokuphuma. Ngexesha lokutshaja, amandla ombane etheminali angaphezulu kwamandla e-electromotive kwaye avule-amandla ombane wesekethe. Ukumelana nebhetri kwangaphakathi yiparameter ebaluleke kakhulu yomthombo wamandla ekhemikhali. Ichaphazela ngokuthe ngqo amandla ombane ebhetri, amandla asebenzayo, amandla aphumayo, kunye namandla. Kumthombo wamandla osebenzayo wekhemikhali, okuya kusezantsi ukuchasana kwangaphakathi, kungcono.
Ukuchasana kwebhetri kwangaphakathi akutshintshi; iyahluka ngexesha lokukhutshwa kuxhomekeke ekubunjweni kwezinto ezisebenzayo, ukugxilwa kwe-electrolyte, ukushisa kwebhetri, kunye nexesha lokukhutshwa. Ukuxhatshazwa kwangaphakathi kwebhetri kubandakanya ukuchasana kwe-ohmic yangaphakathi (R₀) kunye nokuxhatshazwa kwangaphakathi kwe-polarization (Rf) ebonakaliswe ngama-electrodes ngexesha lokuphendula kwe-electrochemical. Isimbuku sezi zibini sibizwa ngokuba yibhetri epheleleyo yangaphakathi yokumelana (Rw).
Ukuxhathisa kwangaphakathi kwe-Ohmic ubukhulu becala kuqulunqwe ukuxhathisa kwangaphakathi kwezinto ze-electrode, i-electrolyte, isahluli, kunye nokumelana nokunxibelelana kwamacandelo ahlukeneyo. Inxulumene nobukhulu bebhetri, ulwakhiwo, indlela yokwenza i-electrode (umzekelo, ukuncamathelisa-uhlobo kunye ne-electrode ye-tubular kwi-lead{4}}ibhetri yeasidi, kunye nebhokisi{5}}uhlobo kunye ne-sintered electrode kwiibhetri ze-alkaline), kunye nokuqina kwe-asembly. Ukuchasana kwangaphakathi kwe-Ohmic kuthobela umthetho ka-Ohm.
Ukuchasana kwangaphakathi kwe-polarization kubhekiselele ekuchaseni kwangaphakathi okubangelwa yi-polarization phakathi kwee-electrodes ezintle kunye nezibi zomthombo wamandla ekhemikhali ngexesha le-electrochemical reaction. Isisixa sokuchasana okubangelwa yi-electrochemical polarization kunye nokugxila
i-polarization.
Ukuchasana kwe-polarization kwangaphakathi kuhambelana nobume bezinto ezisebenzayo, isakhiwo se-electrode, kunye nenkqubo yokuvelisa ibhetri, ngokukodwa ngokusondeleyo kwiimeko zokusebenza kwebhetri; ukukhutshwa kwangoku kunye nobushushu kunempembelelo ebalulekileyo. Ngexesha lokukhutshwa koxinano oluphezulu lwangoku, zombini i-electrochemical polarization kunye ne-concentration polarization yanda, enokuthi ibangele ukunyanzeliswa kwe-electrode engalunganga, ngaloo ndlela inyusa ukumelana ne-polarization yangaphakathi. Amaqondo obushushu aphantsi achaphazela kakubi i-electrochemical polarization kunye ne-ion diffusion; Ngoko ke, ukuchasana kwebhetri kwangaphakathi nako konyuka phantsi{2}}kweemeko zobushushu obuphantsi. Ngoko ke, ukuchasana kwe-polarization akusiyo rhoqo, kodwa utshintsho kunye nesantya sokukhutshwa, ukushisa kunye nezinye iimeko.
Inkcazo yohlalutyo yokuxhathisa kwangaphakathi kwebhetri ngolu hlobo lulandelayo:
Kwifomula, bE (iₐ,τ,C) Iₐ⁻¹-Ukuchasana kwebhetri yepolarization yangaphakathi;
b-I-coefficient yokwahluka kwe-terminal voltage yebhetri ehambelana ne-terminal ye-terminal voltage E phantsi kweemeko ezilinganisiweyo zomthamo xa ibhetri ihlawuliswa kwaye ikhutshwe nge-Iₐ yangoku;
Rₑₗ(τ,C){0}}Ukumelana ne-electrolyte;
Rₑ(C){0}}Ukuxhathisa i-Electrode. I-electrolyte resistance Rₑₗ kunye ne-electrode resistance Rₑ ihambelana ngokungafaniyo nomthamo webhetri ngokukhawuleza;
iₐ, τ, C{0}}Ukutshaja kwebhetri kunye nokukhupha yangoku, ubushushu, kunye nobume bomthamo ngelo xesha.
Ukuchasana kwangaphakathi kwebhetri kuncinci kwaye kaninzi akunamsebenzi phantsi kweemeko ezininzi zokusebenza. Nangona kunjalo, iibhetri zamandla kwizithuthi zombane zihlala zisebenza phantsi kweemeko eziphezulu zangoku kunye nezinzulu zokukhutshwa, okubangelwa ukuhla kwamandla ombane okubangelwa ukuchasana kwangaphakathi. Kule meko, impembelelo yokuchasana kwangaphakathi kwisiphaluka sonke ayinakuhoywa.
