baterie:zincbromine [badgerhole]

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Denik
Navody, postupy
Teorie
Nabijeni
Material

Denik

2020.04.07 200ml do toho 0.1mol (28.75g) ZnSO4.7H2O a 0.2mol (20.58g) NaBr odparit na cca 40ml, nechat vysrazet na2so4 pak jeste pridat 2,05g NaBr a doredit na 40ml

baterie

#1 6.5ml elektrolytu, nabijeno 100mA cca 20 minut zacal tect brom.
#2 4ml elektrolytu, nejde zavrit neprodysne
#3 4ml elektrolytu

2020.04.08

#3 nabijena 50mA a cca 3.88V po cca 36min napeti 4.51V pri 50mA, po sesti minutcha cca 1.8V ale po pripojeni motoru se neroztoci a baterka ma 0.04V, lampicka sviti.. na baterce cca 200mV, na vystupu 2.5V, po cca ctvrt hodine na baterce 0.17V, pak 1L05 cca 50mA

#4 6ml elektrolytu zacala nabijeni na 3.3v pri 50mA, prosakuje na plose pres grafit. asi to chce vic folie.
#5 uhli 0.6-0.8mm 1.4g a zinkovej plech, nafukuje se
#2 pridany 2ml, druhy pokus o uzavreni, tece plochou
#6 6ml elektrolytu

2020.04.07

200ml do toho 0.1mol (28.75g) ZnSO4.7H2O a 0.2mol (20.58g) NaBr odparit na cca 40ml,

nechat vysrazet na2so4 pak jeste pridat 2,05g NaBr a doredit na 40ml

2020.04.21 0.2mol ZnSO4.7H2O a 0.4mol NaBr , vyvarit dekantovat, pridat 4.11g nabr

Navody, postupy

Elektrolyt

Priprava bromidu zinecnateho

20200126_How To Make Zinc Bromide For A Battery Electrolyte.mp4

1mol ZnSO4
2 moly NaBr

RMS dela 1M roztok ZnSO4 a 2M roztok NaBr smicha a odpari 3/4 vody (z 200ml na 50ml) normalne to dela na 1/8.. tedy skonci zhruba s 4M roztokem

NaSO4 max 2M roztok ZnBr cca 10M max

na udrzeni bromu v baterce: Tetrabutylammonium bromide https://www.sigmaaldrich.com/catalog/product/sial/426288?lang=en&region=CZ

https://www.sciencedirect.com/science/article/pii/S2589004220305356

vyroba

zelena houba 0.19g houby pobere 6.75g vody

elektrolyt:

6mm carbon felt soaked in 0.25M TBAB

3.5M znbr2 + 1M NaBr and 2% by weight polyethylene glycol kdyz pouzivas tbab, jinak to bude jiny.. to je v nejakym jinym videu

ve videu 20201020_Building Big Batteries For DIY Off Grid.mkv je 2.5M roztok ZnBr2 a 0.5M NaBr

v tom videu okolo 17:53 taky mluvi o dispernim oxidu kremicitym, aby se z elektrolytu udelal gel

TBAB je jedna z: https://en.wikipedia.org/wiki/Quaternary_ammonium_cation

Kapacita

20201020_Building Big Batteries For DIY Off Grid.mkv to popsuje okolo 9:00

Konstrukce

Kraicka s vyvodama nahore

krabicka vevnitr 20×32

elektrody 20×65 a 20x 50

Teorie

https://pubs.rsc.org/en/content/articlehtml/2016/ee/c6ee02782b

https://iopscience.iop.org/article/10.1149/2.0151816jes/pdf

https://www.researchgate.net/publication/268113564_New_Bromine_Complexing_Agents_for_Bromide_Based_Batteries

Nabijeni

tady se mluvi o nabijeni napetim 1.5V https://www.sandia.gov/ess-ssl/publications/SAND2000-0893.pdf

20201020_Building Big Batteries For DIY Off Grid.mkv okolo 13:00 rika:

RMS mluvi o nabijeni proudem na plochu elektrody v jednom videu o nab cca 20-50mA/cm2 povrchu elektrod. podle poklesu proudu/napet by se se melo poznat nabiti, pri prebijeni se muze tvori H2 a O2. a o15-30mA/cm2 povrchu elektrody ve videu 20191125_Robert Murray-Smith_The Zinc Bromide Battery - How To Make It.mp4

https://pubs.rsc.org/en/content/articlelanding/2017/ee/c6ee02782b#!divAbstract