Hong Kong CityU EES: Hloov tau lithium-ion roj teeb tau tshwm sim los ntawm tib neeg cov pob qij txha

Kev tshawb fawb keeb kwm

Qhov kev thov nce ntxiv rau cov khoom siv hluav taws xob tau txhawb txoj kev loj hlob sai ntawm cov khoom siv tau yooj yim thiab cov khoom siv hluav taws xob ceev ceev hauv xyoo tas los no. Flexible lithium ion roj teeb (LIBs) nrog lub zog siab ceev thiab ruaj khov electrochemical kev ua tau zoo yog suav tias yog lub roj teeb zoo tshaj plaws rau cov khoom siv hluav taws xob hnav. Txawm hais tias kev siv cov yeeb yaj kiab nyias nyias thiab cov khoom siv polymer-raws li electrodes ua rau txhim kho qhov yooj yim ntawm LIBs, muaj cov teeb meem hauv qab no:

(1) Feem ntau cov roj teeb uas hloov tau yooj yim yog stacked los ntawm "tsis zoo electrode-separator-zoo electrode," thiab lawv txwv deformability thiab slippage ntawm multilayer stacks txwv tag nrho cov kev ua tau zoo ntawm LIBs;

(2) Nyob rau qee qhov mob hnyav, xws li folding, ncab, winding, thiab nyuaj deformation, nws tsis tuaj yeem lav roj teeb kev ua tau zoo;

(3) Ib feem ntawm lub tswv yim tsim tsis quav ntsej qhov deformation ntawm cov khoom siv hlau tam sim no.

Yog li ntawd, ib txhij ua tiav nws lub kaum sab xis me ntsis, ntau hom deformation, superior mechanical durability, thiab siab zog ceev tseem ntsib ntau yam teeb meem.

Introduction

Tsis ntev los no, xibfwb Chunyi Zhi thiab Dr. Cuiping Han ntawm Lub Nroog University of Hong Kong tau luam tawm ib daim ntawv hu ua "Tib neeg sib koom ua ke txhawb kev tsim qauv rau kev khoov / foldable / stretchable / twistable roj teeb: ua tiav ntau yam deformability" ntawm Energy Environ. Sci. Txoj haujlwm no tau txais kev tshoov siab los ntawm cov qauv ntawm tib neeg cov pob qij txha thiab tsim ib hom kev hloov pauv LIBs zoo ib yam li kev sib koom ua ke. Raws li cov qauv tsim tshiab no, cov roj teeb uas tau npaj, hloov tau yooj yim tuaj yeem ua tiav lub zog ceev thiab yuav tsum tau khoov lossis txawm tias folded ntawm 180 °. Nyob rau tib lub sijhawm, cov qauv txheej txheem tuaj yeem hloov pauv los ntawm kev sib txawv winding kom hloov tau LIBs muaj peev xwm deformation nplua nuj, tuaj yeem siv rau qhov hnyav thiab nyuaj deformations (winding thiab twisting), thiab tuaj yeem ncab, thiab lawv cov peev xwm deformation yog. deb dhau ntawm cov ntaub ntawv dhau los ntawm LIBs hloov tau. Finite element simulation tsom xam tau lees paub tias lub roj teeb tsim nyob rau hauv daim ntawv no yuav tsis dhau irreversible yas deformation ntawm tam sim no hlau collector nyob rau hauv ntau yam hnyav thiab complex deformations. Nyob rau tib lub sijhawm, cov roj teeb sib sau ua ke tuaj yeem ua tiav lub zog ceev txog li 371.9 Wh / L, uas yog 92.9% ntawm cov khoom siv roj teeb ib txwm muaj. Tsis tas li ntawd, nws tuaj yeem tswj xyuas qhov kev ua haujlwm ruaj khov txawm tias tom qab ntau dua 200,000 lub sijhawm ntawm kev khoov dynamic thiab 25,000 zaug ntawm kev hloov pauv hloov pauv.

Kev tshawb fawb ntxiv qhia tau hais tias lub cylindrical chav tsev sib sau ua ke tuaj yeem tiv taus ntau dua thiab nyuaj deformations. Tom qab ntau tshaj 100,000 dynamic stretchings, 20,000 twists, thiab 100,000 dabtsi yog khoov deformations, nws tseem tuaj yeem ua tiav lub peev xwm siab tshaj 88% - tuav tus nqi. Yog li ntawd, qhov hloov pauv tau LIBs tau npaj rau hauv daim ntawv no muab qhov kev cia siab loj rau kev siv tau zoo hauv cov khoom siv hluav taws xob hnav.

Tshawb nrhiav cov ntsiab lus

1) Flexible LIBs, kev tshoov siab los ntawm tib neeg cov pob qij txha, tuaj yeem tswj kev ua haujlwm ruaj khov nyob rau hauv kev khoov, twisting, ncab, thiab winding deformations;

(2) Nrog lub roj teeb hloov pauv tau yooj yim, nws tuaj yeem ua tiav lub zog ceev txog li 371.9 Wh / L, uas yog 92.9% ntawm cov khoom siv roj teeb ib txwm muaj;

(3) Txoj kev sib txawv winding tuaj yeem hloov cov duab ntawm lub roj teeb thiab muab lub roj teeb txaus deformability.

Daim duab qhia

Kev tshawb fawb tau pom tias, ntxiv rau kom ntseeg tau tias lub zog ntim siab thiab ntau dua deformation, tus qauv tsim yuav tsum zam kom tsis txhob muaj cov yas deformation ntawm cov khoom siv tam sim no. Lub finite caij simulation qhia tau hais tias txoj kev zoo tshaj plaws ntawm cov khoom siv tam sim no yuav tsum tiv thaiv cov khoom siv tam sim no kom tsis txhob muaj lub voj voog me me thaum lub sij hawm khoov cov txheej txheem kom tsis txhob muaj cov yas deformation thiab irreversible puas ntawm cov khoom tam sim no.

Daim duab 1a qhia txog cov qauv ntawm tib neeg cov pob qij txha, nyob rau hauv uas lub cleverly loj nkhaus nto tsim pab cov pob qij txha tig smoothly. Raws li qhov no, daim duab 1b qhia txog cov graphite anode / diaphragm / lithium cobaltate (LCO) anode, uas tuaj yeem raug mob rau hauv cov qauv tuab tuab. Hauv kev sib tshuam, nws muaj ob pawg tuab tuab thiab ib feem hloov tau. Qhov tseem ceeb tshaj, cov pawg tuab muaj qhov sib npaug ntawm qhov sib npaug ntawm cov pob txha pob txha, uas yuav pab tsis tau lub siab thiab muab lub peev xwm tseem ceeb ntawm lub roj teeb hloov tau. Lub elastic feem ua raws li ligament, txuas cov pawg tuab thiab muab kev yooj yim (Daim duab 1c). Ntxiv rau winding rau hauv ib pawg square, cov roj teeb uas muaj cylindrical lossis triangular cells tuaj yeem tsim los ntawm kev hloov txoj kev winding (Daim duab 1d). Rau kev hloov pauv LIBs nrog cov square zog cia chav nyob, cov ntu sib txuas yuav dov raws li qhov arc-shaped nto ntawm cov pawg tuab thaum lub sijhawm khoov (Daim duab 1e), yog li ua kom lub zog ntom ntom ntawm cov roj teeb hloov tau. Tsis tas li ntawd, los ntawm elastic polymer encapsulation, saj zawg zog LIBs nrog cylindrical units tuaj yeem ua tiav cov khoom elastic thiab hloov tau (Daim duab 1f).

Daim duab 1 (a) Cov qauv tsim ntawm kev sib txuas tshwj xeeb ligament thiab nkhaus nto yog qhov tseem ceeb kom ua tiav qhov yooj; (b) Schematic daim duab ntawm cov qauv roj teeb hloov tau thiab cov txheej txheem tsim khoom; (c) cov pob txha sib raug rau cov khoom siv electrode thicker, thiab ligament sib haum rau unrolled (D) Cov roj teeb hloov tau yooj yim nrog cov cylindrical thiab triangular hlwb; (e) Stacking schematic daim duab ntawm square cells; (f) Stretching deformation ntawm cylindrical hlwb.

Ntxiv rau kev siv tshuab simulation tsom xam qhov kev ruaj ntseg ntawm cov qauv roj teeb hloov tau. Daim duab 2a qhia txog kev ntxhov siab ntawm tooj liab thiab txhuas ntawv ci thaum khoov rau hauv lub tog raj kheej (180 ° radian). Cov txiaj ntsig tau pom tias qhov kev ntxhov siab ntawm tooj liab thiab aluminium ntawv ci yog qis dua li lawv lub zog tawm los, qhia tias qhov deformation no yuav tsis ua rau cov yas deformation. Cov khoom siv hlau tam sim no tuaj yeem zam tsis tau kev puas tsuaj.

Daim duab 2b qhia tau hais tias qhov kev nyuaj siab faib tawm thaum lub degree ntawm dabtsi yog khoov yog ntxiv, thiab cov kev ntxhov siab ntawm cov ntawv ci tooj liab thiab txhuas ntawv ci tseem tsawg dua li lawv cov khoom muaj zog. Yog li ntawd, cov qauv tuaj yeem tiv taus folding deformation thaum tswj xyuas kom zoo. Ntxiv nrog rau kev khoov deformation, lub kaw lus tuaj yeem ua tiav qee qhov kev cuam tshuam (Daim duab 2c).

Rau cov roj teeb uas muaj cylindrical units, vim yog cov yam ntxwv ntawm lub voj voog, nws tuaj yeem ua tiav ntau dua thiab nyuaj deformation. Yog li ntawd, thaum lub roj teeb yog folded rau 180o (Daim duab 2d, e), stretched mus txog 140% ntawm qhov qub ntev (Daim duab 2f), thiab twisted mus rau 90o (Daim duab 2g), nws muaj peev xwm tswj tau txhua yam stability. Tsis tas li ntawd, thaum khoov + twisting thiab winding deformation yog siv nyias, cov qauv tsim LIBs yuav tsis ua rau cov yas deformation ntawm cov hlau tam sim no nyob rau hauv ntau yam hnyav thiab nyuaj deformations.

Daim duab 2 (ac) Finite element simulation tshwm sim ntawm ib lub xov tooj square nyob rau hauv khoov, folding, thiab twisting; (di) Finite element simulation tshwm sim ntawm lub cylindrical cell nyob rau hauv khoov, folding, stretching, twisting, dabtsi yog khoov + twisting thiab winding.

Txhawm rau ntsuas qhov kev ua tau zoo ntawm electrochemical ntawm lub roj teeb hloov tau tsim, LiCoO2 tau siv los ua cov khoom siv cathode los ntsuas lub peev xwm tawm thiab lub voj voog ruaj khov. Raws li pom nyob rau hauv daim duab 3a, lub peev xwm tawm ntawm lub roj teeb nrog cov square hlwb tsis txo qis tom qab lub dav hlau deformed rau khoov, nplhaib, folded, thiab twisted ntawm 1 C magnification, uas txhais tau hais tias cov neeg kho tshuab deformation yuav tsis ua rau tus tsim ntawm lub roj teeb hloov tau los ua electrochemically Performance poob. Txawm tias tom qab dynamic dabtsi yog khoov (Daim duab 3c, d) thiab dynamic torsion (Daim duab 3e, f), thiab tom qab ib tug tej lub sij hawm ntawm lub voj voog, lub them thiab tso tawm platform thiab ntev-lub voj voog kev ua tau zoo tsis muaj kev hloov pauv, uas txhais tau hais tias cov qauv sab hauv ntawm lub roj teeb muaj kev tiv thaiv zoo.

Daim duab 3 (a) Them thiab tso tawm kev sim ntawm square unit roj teeb hauv qab 1C; (b) Them thiab tawm nkhaus raws li qhov sib txawv; (c, d) Nyob rau hauv dynamic dabtsi yog khoov, roj teeb lub voj voog kev ua tau zoo thiab coj tus nqi thiab tawm nkhaus; (e, f) Nyob rau hauv dynamic torsion, lub voj voog kev ua tau zoo ntawm lub roj teeb thiab tus nqi them-kho tawm nkhaus nyob rau hauv ntau lub voj voog.

Cov txiaj ntsig kev simulation qhia tau hais tias ua tsaug rau cov yam ntxwv ntawm lub voj voog, qhov hloov pauv LIBs nrog cov ntsiab lus cylindrical tuaj yeem tiv taus ntau dua thiab nyuaj deformations. Yog li ntawd, txhawm rau ua kom pom kev ua haujlwm ntawm electrochemical ntawm qhov hloov pauv LIBs ntawm chav tsev cylindrical, qhov kev sim tau ua tiav ntawm tus nqi ntawm 1 C, uas pom tau tias thaum lub roj teeb muaj ntau yam deformations, yuav luag tsis muaj kev hloov pauv hauv electrochemical kev ua haujlwm. Lub deformation yuav tsis ua rau qhov voltage nkhaus hloov (Daim duab 4a, b).

Txhawm rau ntsuas lub cylindrical roj teeb lub electrochemical stability thiab mechanical durability, nws raug lub roj teeb mus rau ib tug dynamic automated load test ntawm tus nqi ntawm 1 C. Kev tshawb fawb qhia tau hais tias tom qab dynamic stretching (Daim duab 4c, d), dynamic torsion (Daim duab 4e, f) , thiab dynamic dabtsi yog khoov + torsion (Daim duab 4g, h), lub roj teeb them-kho tawm lub voj voog kev ua haujlwm thiab qhov sib thooj voltage nkhaus tsis cuam tshuam. Daim duab 4i qhia txog kev ua haujlwm ntawm lub roj teeb nrog lub zog muaj yeeb yuj cia. Lub peev xwm tso tawm los ntawm 133.3 mAm g-1 txog 129.9 mAh g-1, thiab lub peev xwm poob ib lub voj voog tsuas yog 0.04%, qhia tias deformation yuav tsis cuam tshuam rau nws lub voj voog ruaj khov thiab muaj peev xwm tawm.

Daim duab 4 (a) Them thiab tawm lub voj voog kuaj ntawm qhov sib txawv ntawm cov cylindrical hlwb ntawm 1 C; (b) Cov nqi sib xws thiab kev tso tawm nkhaus ntawm lub roj teeb nyob rau hauv cov xwm txheej sib txawv; (c, d) Lub voj voog kev ua haujlwm thiab kev them nqi ntawm lub roj teeb nyob rau hauv dynamic nro Discharge nkhaus; (e, f) lub voj voog kev ua haujlwm ntawm lub roj teeb nyob rau hauv dynamic torsion thiab tus nqi them-kho tawm nkhaus nyob rau hauv ntau lub voj voog; (g, h) lub voj voog kev ua haujlwm ntawm lub roj teeb nyob rau hauv dynamic dabtsi yog khoov + torsion thiab tus nqi them-kho tawm nkhaus nyob rau hauv ntau lub voj voog; (I) Them thiab tso tawm kev xeem ntawm prismatic unit roj teeb nrog txawv configurations ntawm 1 C.

Txhawm rau soj ntsuam daim ntawv thov ntawm cov roj teeb hloov tau yooj yim hauv kev xyaum, tus neeg sau ntawv siv cov roj teeb tag nrho nrog ntau hom kev cia khoom siv hluav taws xob los siv qee yam khoom siv hluav taws xob, xws li lub mloog pob ntseg, smartwatches, mini hluav taws xob kiv cua, khoom siv tshuaj pleev ib ce, thiab cov xov tooj ntse. Ob leeg yog txaus rau kev siv txhua hnub, tag nrho embody lub peev xwm ntawm ntau yam khoom siv hluav taws xob hloov tau yooj yim thiab hnav.

Daim duab 5 siv lub roj teeb uas tsim los rau lub mloog pob ntseg, smartwatches, mini hluav taws xob kiv cua, khoom siv tshuaj pleev ib ce, thiab smartphones. Lub roj teeb hloov tau muab lub zog rau (a) lub mloog pob ntseg, (b) smartwatches, thiab (c) mini hluav taws xob kiv cua; (d) muab lub zog rau cov khoom siv tshuaj pleev ib ce; (e) raws li qhov sib txawv deformation, lub roj teeb hloov tau muab lub zog rau cov xov tooj smartphones.

Summary thiab outlook

Hauv cov ntsiab lus, kab lus no tau tshwm sim los ntawm cov qauv ntawm tib neeg cov pob qij txha. Nws nthuav tawm txoj kev tsim tshwj xeeb rau kev tsim cov roj teeb hloov tau nrog lub zog siab ceev, ntau yam deformability, thiab kav ntev. Piv nrog rau cov kev hloov pauv ib txwm muaj LIBs, qhov kev tsim tshiab no tuaj yeem zam cov yas deformation ntawm cov khoom siv hlau tam sim no. Nyob rau tib lub sijhawm, qhov nkhaus ntawm qhov chaw tshwj tseg ntawm ob qho kawg ntawm lub zog cia chav tsev tsim nyob rau hauv daim ntawv no tuaj yeem txo qhov kev ntxhov siab hauv zos ntawm cov khoom sib txuas. Tsis tas li ntawd, txoj kev sib txawv winding tuaj yeem hloov cov duab ntawm pawg, muab lub roj teeb txaus deformability. Lub roj teeb hloov tau nthuav tawm lub voj voog zoo ruaj khov thiab kev ua haujlwm ruaj khov ua tsaug rau cov qauv tsim tshiab thiab muaj cov ntawv thov dav dav hauv ntau yam khoom siv hluav taws xob hloov tau yooj yim thiab hnav.

Cov ntawv nyeem txuas

Tib neeg kev sib koom ua ke tsim qauv tsim rau khoov / foldable / stretchable / twistable roj teeb: ua tiav ntau yam deformability. (Zog Zog. Sci., 2021, DOI: 10.1039/D1EE00480H)