Dendrite lithium kawai yana nufin cewa lokacin da adadin lithium ɗin da aka saka a cikin graphite ya zarce juriyarsa, ion lithium da suka wuce gona da iri za su haɗu da electrons da ke fitowa daga gurɓataccen lantarki kuma su fara sakawa a saman gurɓataccen lantarki. A cikin aiwatar da cajin baturi, wani irin ƙarfin lantarki daga wajen duniya da na ciki lithium ion anode kayan don fitowa a cikin electrolyte matsakaici, electrolyte na lithium ion kuma a karkashin yanayin da ƙarfin lantarki bambanci tsakanin waje duniya zuwa carbon Layer motsi. , saboda graphite tashar tashar layi ce, lithium lithium zai shiga tashar tare da carbon don samar da mahadi na carbon, LiCx (x = 1 ~ 6) graphite interlaminar mahadi an kafa. Ana iya bayyana halayen electrochemical akan anode na baturin lithium kamar haka:

A cikin wannan dabara, kuna da siga guda ɗaya, hoton, kuma idan kun haɗa su biyu tare hoton, zaku sami lithium dendrite. Akwai ra’ayi a nan wanda kowa ya saba da shi, mahaɗan graphite interlaminar. Graphite interlamellar mahadi (GICs a takaice) su ne crystalline mahadi a cikinsa wadanda ba carbonaceous reactants aka saka a cikin graphite yadudduka ta jiki ko sinadarai wajen hade tare da hexagonal cibiyar sadarwa jirage na carbon yayin da graphite lamellar tsarin.

Features:

Dendrite lithium gabaɗaya ana ajiye shi akan wurin tuntuɓar diaphragm da maƙarƙashiya mara kyau. Daliban da ke da gogewa wajen wargaza batura yakamata su sami wani yanki na launin toka akan diaphragm. Ee, wannan shine lithium. Dendrite lithium karfen lithium ne da aka kafa bayan lithium ion ya karbi lantarki. Karfe na lithium ba zai iya samar da lithium ion ba don shiga cikin caji da fitarwa na baturi, yana haifar da raguwar ƙarfin baturi. Dendrite lithium yana tsiro daga saman madaidaicin lantarki zuwa diaphragm. Idan ana ci gaba da ajiyar ƙarfe na lithium, a ƙarshe zai huda diaphragm kuma ya haifar da gajeriyar da’ira, yana haifar da matsalolin amincin baturi.

Abubuwa masu tasiri:

Babban abubuwan da suka shafi samuwar dendrite lithium sune roughness na anode surface, maida hankali gradient na lithium ion da halin yanzu yawa, da dai sauransu Bugu da kari, SEI fim, irin electrolyte, solute maida hankali da kuma tasiri nisa tsakanin tabbatacce. da kuma gurɓataccen lantarki duk suna da wani tasiri akan samuwar lithium dendrite.

1. Mummunan yanayi mara kyau

Ƙarƙashin ƙarancin wutar lantarki mara kyau yana rinjayar samuwar dendrite lithium, kuma yanayin da ya fi dacewa, mafi dacewa shine samuwar dendrite lithium. Samuwar lithium dendrite ya ƙunshi manyan abubuwan ciki guda huɗu, waɗanda suka haɗa da electrochemistry, crystology, thermodynamics and kinetics, waɗanda aka bayyana dalla-dalla a cikin labarin David R. Ely.

2. Gradient da rarraba lithium ion maida hankali

Bayan kuɓuta daga ingantaccen abu, ions lithium suna wucewa ta cikin electrolyte da membrane don karɓar electrons a mummunan lantarki. A yayin aiwatar da caji, ɗimbin ion lithium a cikin ingantattun lantarki a hankali yana ƙaruwa, yayin da ɗimbin ion lithium a cikin gurɓataccen lantarki yana raguwa saboda ci gaba da karɓar electrons. A cikin bayani mai tsarma tare da babban adadin halin yanzu, ƙaddamarwar ion ya zama sifili. Samfurin da Chazalviel da Chazalviel suka kafa ya nuna cewa lokacin da aka rage yawan ƙwayar ion zuwa 0, ƙananan lantarki zai haifar da cajin sararin samaniya na gida kuma ya samar da tsarin dendrite. Girman girma na tsarin dendrite daidai yake da na ƙaura na ion a cikin electrolyte.

3. Yawan halin yanzu

A cikin labarin Ci gaban Dendrite a cikin Lithium/Polymer Systems, marubucin ya yi imanin cewa ƙimar girma na tip na Dendrite Lithium yana da alaƙa da yawa na yanzu, kamar yadda aka nuna a cikin ma’auni mai zuwa:

Hoton

Idan an rage yawan halin yanzu, ci gaban dendrite lithium zai iya jinkirta zuwa wani matsayi, kamar yadda aka nuna a cikin adadi a ƙasa:

Hoton

Yadda za a guji:

Tsarin samuwar lithium dendrite har yanzu a bayyane yake, amma akwai nau’ikan girma daban-daban na ƙarfe na lithium. Dangane da samuwar da abubuwan tasiri na dendrite lithium, ana iya kaucewa samuwar lithium na dendrite daga abubuwan da ke gaba:

1. Sarrafa shimfidar wuri na kayan anode.

2. Girman barbashi mara kyau ya kamata ya zama ƙasa da radius mai mahimmanci na thermodynamic.

3. Sarrafa wettability na electrodeposition.

4. Ƙayyade ƙarfin lantarki a ƙasa da mahimmancin ƙimar. Bugu da ƙari, ana iya inganta tsarin caji da caji na gargajiya, alal misali, ana iya la’akari da yanayin bugun jini.

5. Ƙara abubuwan da ake amfani da su na electrolyte waɗanda ke daidaita ma’amala mara kyau-electrolyte

6. Sauya ruwa electrolyte tare da babban ƙarfi gel / m electrolyte

7. Kafa saman kariya Layer na high ƙarfi lithium anode

A ƙarshe, an bar tambayoyi biyu don tattaunawa a ƙarshen labarin:

1. Ina halayen electrochemical na lithium ions? Daya shi ne cewa lithium ions a saman graphite electrochemical dauki bayan m taro canja wuri, don isa ga jikewa yanayin. Na biyu, lithium ions suna ƙaura zuwa matakan graphite ta hanyar iyakokin hatsi na graphite microcrystals kuma suna amsawa a cikin graphite.

2. Shin lithium ions suna amsawa tare da graphite don samar da fili na lithium carbon da dendrite lithium tare ko a jere?

Barka da zuwa tattaunawa, bar sako ~