別紙41 信果程博士(英文))Date of submission (monlh da>, yeal')

IUトフ山.2023

Dcpanmenl 01'1ξIcclrlcal andItlccl】'on】C 11〕1'onnal【0ⅡS1ⅡdCΠ1 Ⅱ)＼11n】bcr

D20920・1

1ξn旦inecl'in豊Su pel'YIS01メ人tsun01']八latsuda

Radian Febilndrawan

へ1)P11CaΠ1'S "をlnlc

Abstract (Doctor)
Ti11e ofThesis

E行セCts ofoxide lncm'P田'ation into sultlde solid Electrob、1es and Devclopn〕enl
OfA11・solid・state Lithiun〕・10n Batteries

APPI'O×.800 、 、OTds

Solid eleCれ'olytes (SES) play a a'ilica11'ole in aⅡ・solid・stale li11〕ium・ion ba11el'ics (<SSI,1BS)
by actlng as both eleCれ'on seP田'ators and ion conduclors. one pl'on〕isine mcthod lbr sf syn11〕csis isIiq山d‑phase synthesis,＼vhich 011'ers scalability and en飢、σy enlciency. HO、veV引'.impurilies and 山eCon)plexlty of sEs prepal'ed tl〕1'OU旦h this n〕ethod haYe posed chaⅡenσes. makinσ liquid eleC1↑olyles
Indispensable u〕 many casesh〕 a suldy a11ned at ad山'essing 11〕ese chaⅡen(丁es、 higl〕1ン Conduclin旦 li11〕iU1η・ion solid
electl'ob/tes based on a looLi3PS4‑501"il・XLi3P0斗 Con〕posilion (o f x く 20 m01ツ0)圦CI'CSuccessfUⅡy synthesized uslng 11quld‑phase synlheslS >、/1tl〕 etl〕>^I m'oplonale aS 11〕C I"cacl】on
medilun. h〕t磁'estingly, the addition of Li3P04 il]to thc Li3PSI‑1Jil stnlcU11'e. UP I0 ×= 20. did not
resU111n notlceablc se少'egated peaks nlthc x・ray dif介aC110n palten〕SFUI'ther analysis usinσ 31P NMR revealed the fonnation of l)02Sf and l)OSゞ、 Llnils.

indicating tl〕at Li3P0斗 1'eacted with the Lbs・P2Ss syslen〕 to fonn 上i3P0↓・XSX.<lnon甑 the町江lthesized electrolytes、 tl〕e one xvith x = 10 exhibiled tl〕e hiσ1〕esl rooln tempel、at山、e conductiYityOfapproxin〕ately 8.5 × 10‑4 Scln‑1
Moreover、 the study also addressed tl〕e issue of 上i3P04 in〕purily f01、n〕ation dul'inq lhc
Synthesis of L16PS5C1 印'gyl'odite sEs uslng 11quld・PI〕ase synthesis. By replacin旦 hy小'oxidc・based
Solvents with tl〕i01・based solvcnts. Li3P01＼¥as successfU11y elin〕inated 介oln 11〕e l"i61)SSCI S11S二Π〕isn〕odification resulted in the Li6PS5Cl sls ad〕ievinq the highcsl ionic conductiYity value (>2nls'cn〕‑1) ever reported t1Ⅱ'ough liquid・PI〕̲ase synthesis.1n〕POTtantly. tl〕e absencc of li3Pol in lhe
雛'gy'odite sE led to slgnificantly inC↑eased capacily and ren〕al'kable stability

10 furtl〕el' enhance tlw stabilily of the 上i6PS5Cl ar〔丁yrodite sE. the study exP1ω'ed oxygendoping by syl〕thesizing Li6PSS‑25×025XCI (X = 0.0.05. and o.10) solid electrolytes using
Iiquid・phase synthesis. The solid electrolyte ＼Nith x = 0.05 exhibited hiσ1〕 ionic conductivity alon曾
圦lth lmpl'oved elecu'ochemlcal stability aqainS11i11〕iun〕 n〕etal and oxide cathodes. Arqyrodites ＼¥ith
X = 0,05 and x = 0.10 delnonstrated superi0↑ Capacity retention and hiσher coulon〕b efnciencyCon〕Pω'cd to x = 0. M01'eover. tl〕e solid electl'olytes exhibited enhanced stability durinσ LiSyn〕1ΥIctncal ceⅡ n〕casurelnents

OveraⅡ. this ＼ '0↑k pl'ovides Yaluable insi旦hts into achieYinq hiσ1卜P引f01'n〕ance ASSLIBSIhrough liqⅧd・phase s>'ntlwsls. By C田'e丘1Ⅱy contl'011in旦 the con〕position and synthesis conditions、Such as lntroduclng Li3P01 0r oxygen doplng. it is posslble to oP11n〕1Ze the conductlvity andStability of the solid eleclrowte systems. pavlng the v、/ay for tl]e developlnent of advancedaⅡ・solid・slalc lilhiun〕・ion battenes

In addition to addl'essin旦 StabⅡity chaⅡenσes in sU1行de・based solid electrolytes、 oxyσenSubstitution 0行しrs seV伽'al notable advantaσes for the P剖f0↑lnance and functionality of thesen〕aterials in ASSLIBSIhc il〕corporation of l"i3P0斗 inlo lhe Li3PS上Li1 町Steln and l)205 into Li6PSSC11ead to tl)e
Ibnnalion of ox>sulfide unils.1hese oxysulflde c0111Pounds play a crucial role in enhancinσ tl〕e
CICCU、ochcn〕1Cal stability of lhe solid electl、ob北e. parlicular1ン at the int引'face.1he pl、esence of theOxysU111de unlts l〕elps to mlnlmlze un圦,'anled reactions and side e什でCts, ilnpl'ovinσ the oV引"aⅡ
Stab11ily and paf01、mance of tl]e solid electrolyte.1hiS 行ndinσ hiσ1〕1iσ1]ts tl〕e potential ofIncorp01、atlne L13P04 and p?05 as stralegies to enhance the electroche1Υlical stability of solid
eleC11'olytes. n)aldng theln pl'on〕1Sln旦 Candidates foT advanced en引'gy storage apPⅡCations
In sun〕n〕ar>、 oxy旦en substitution in sulade・based solid electrolytes provides nun1凱'OUS
bcnenls for aⅡ・solid・slate litl〕ium・ion battel'ies' 1t enhances Li・ion conductivity、 ilnproves
CICC11'ochclnlcal slability、 expands tl〕c electl'ochen〕ica1 圦indov、,.御'on〕otes con〕palibility with oxideCatl]odcs、 and aⅡ0ν、s for pl'ccisc contl'01 0Yer dopin旦 levels. These advantaσes contribute {o tl〕edeYelopn〕cnl 01' high・pe寸b↑n〕ance ASSI,1BS 入へdth in〕proYed ener()y st飢'aσe capacity.10nσer cycle
Iilc. and enhanced o＼/el'aⅡ bat1剖'y P飢'fonl)ance