Indlela yokutshaja ibhetri yeLithium kunye nemilinganiselo yokuchasa ukutshaja (2)

Kweli phepha, ukusebenza kwe-overcharge ye-40Ah yebhetri ye-pouch ene-electrode efanelekileyo ye-NCM111 + LMO iphononongwa ngovavanyo kunye nokulinganisa.I-overcharge currents yi-0.33C, 0.5C kunye ne-1C, ngokulandelanayo.Ubungakanani bebhetri yi-240mm * 150mm * 14mm.(ibalwe ngokwe-voltage elinganisiweyo ye-3.65V, umthamo wayo wamandla athile umalunga ne-290Wh/L, isephantsi noko)

I-voltage, iqondo lokushisa kunye nokutshintsha kwangaphakathi kokuchasana ngexesha lenkqubo yokuhlawula ngaphezulu kuboniswe kuMfanekiso 1. Inokwahlulwa ngokufanelekileyo ngokwezigaba ezine:

Inqanaba lokuqala: 1

Inqanaba lesibini: 1.2

Inqanaba lesithathu: 1.4

Inqanaba lesine: I-SOC> 1.6, uxinzelelo lwangaphakathi lwebhetri lugqithise umda, i-casing rupture, i-diaphragm iyancipha kwaye iguqulwe, kunye ne-thermal runway yebhetri.Isiphaluka esifutshane senzeke ngaphakathi kwebhetri, umthamo omkhulu wamandla ukhululwa ngokukhawuleza, kwaye ubushushu bebhetri buphakama ngokukhawuleza ukuya kuma-780 ° C.

Ubushushu obuveliswe ngexesha lenkqubo yokuhlawulela i-overcharge ibandakanya: ukushisa okuguquguqukayo kwe-entropy, ukushisa kwe-Joule, ubushushu bokusabela kweekhemikhali kunye nobushushu obukhutshwe yisekethe emfutshane yangaphakathi.Ubushushu bokusabela kweekhemikhali bubandakanya ubushushu obukhutshwe ngokuchithwa kwe-Mn, ukuphendula kwe-lithium yesinyithi kunye ne-electrolyte, i-oxidation ye-electrolyte, ukubola kwefilimu ye-SEI, ukubola kwe-electrode engalunganga kunye nokubola kwe-electrode efanelekileyo. (NCM111 kunye ne-LMO).Itheyibhile 1 ibonisa utshintsho lwe-enthalpy kunye nokusebenza kwamandla okuphendula ngalunye.(Eli nqaku alizihoyi iimpendulo ezisecaleni zezibopheleli)

Umfanekiso wesi-3 uthelekiso lwezinga lokuvelisa ubushushu ngexesha lokutshaja ngokugqithisileyo ngemisinga eyahlukeneyo yokutshaja.Ezi zigqibo zilandelayo zinokuthathwa kuMfanekiso3:

I-1) Njengoko ukutshaja kwangoku kusanda, ixesha lokubaleka kwe-thermal liqhubela phambili.

I-2) Ukuveliswa kobushushu ngexesha lokugqithisa lilawulwa ngukushisa kwe-Joule.I-SOC <1.2, imveliso yobushushu iyonke ilingana nobushushu beJoule.

3) Kwinqanaba lesibini (1

4) I-SOC> 1.45, ubushushu obukhutshwe yi-reaction ye-lithium yensimbi kunye ne-electrolyte iya kudlula ukushisa kwe-Joule.

5) Xa i-SOC> 1.6, i-reaction yokubola phakathi kwefilimu ye-SEI kunye ne-electrode engalunganga iqala, izinga lokuvelisa ubushushu be-electrolyte oxidation reaction liyenyuka ngokukhawuleza, kwaye izinga lokuvelisa ubushushu lilonke lifikelela kwixabiso eliphezulu.(Iinkcazo ku-4 no-5 kuncwadi azihambelani nemifanekiso, kwaye imifanekiso elapha iya kuphumelela kwaye ihlengahlengiswe.)

I-6) Ngethuba lenkqubo yokugqithiswa, ukuphendulwa kwe-lithium yensimbi kunye ne-electrolyte kunye ne-oxidation ye-electrolyte yizona zimpendulo eziphambili.

Ngolu hlalutyo lungentla, amandla e-oxidation ye-electrolyte, umthamo we-electrode engalunganga, kunye nobushushu bokuqalisa kokubaleka kwe-thermal zi parameters ezintathu eziphambili zokutshaja ngaphezulu.Umfanekiso wesi-4 ubonisa impembelelo yeeparitha ezintathu eziphambili ekusebenzeni ngokugqithisileyo.Kungabonwa ukuba ukonyuka kwamandla e-oxidation ye-electrolyte kunokuphucula kakhulu ukusebenza kwebhetri, ngelixa umthamo we-electrode engalunganga inefuthe elincinci ekusebenzeni kwe-overcharge.(Ngamanye amazwi, i-electrolyte ephezulu ye-voltage inceda ukuphucula ukusebenza kwebhetri, kwaye ukwandisa umlinganiselo we-N / P kunempembelelo encinci ekusebenzeni kwebhetri.)

Iimbekiselo

D. Ren et al.Ijenali yemithombo yamandla 364 (2017) 328-340