Dendrite lithium zvinongoreva kuti kana huwandu hwelithium yakaiswa mugraphite ikadarika kushivirira kwayo, iyo yakawandisa lithium ion inobatana nemaerekitironi anobva kune negative electrode uye otanga kuisa pamusoro peiyo negative electrode. Mukuita kuchajazve bhatiri, voltage kubva kunze kwenyika uye yemukati lithium ion anode zvinhu zvinobuda mukati me electrolyte medium, electrolyte yelithium ion zvakare pasi pemamiriro ekusiyana kwevoltage pakati penyika yekunze kune kabhoni layer kufamba. , nokuti girafu inzira yakatsetseka, lithium lithium ichapinda mugero nekabhoni kuti iite carbon compounds, LiCx (x = 1 ~ 6) graphite interlaminar compounds inoumbwa. Iyo electrochemical reaction pane anode ye lithium bhatiri inogona kuratidzwa seinotevera:

Mune iyi fomula, une imwe parameter, mufananidzo, uye kana iwe ukawedzera iwo maviri pamwechete mufananidzo, iwe unowana dendrite lithium. Pane pfungwa pano iyo munhu wese anoziva nayo, graphite interlaminar makomisheni. Graphite interlamellar compounds (GICs kwenguva pfupi) icrystalline compounds umo ma-non-carbonaceous reactants anoiswa mumagraphite layers nenzira yepanyama kana yekemikari kuti isanganise nehexagonal network ndege dzecarbon apo ichichengetedza graphite lamellar structure.

Features:

Dendrite lithium inowanzoiswa pane yekubata chinzvimbo che diaphragm uye iyo isina kunaka pole. Vadzidzi vane ruzivo mukupwanya mabhatiri vanofanira kazhinji kuwana gireyi zvinhu pa diaphragm. Hongu, ndiyo lithium. Dendrite lithium inonzi lithium simbi inoumbwa mushure mekuti lithium ion igamuchire elekitironi. Lithium simbi haichakwanisa kuumba lithium ion kutora chikamu mukuchaja uye kuburitsa maitiro ebhatiri, zvichikonzera kudzikiswa kwehuwandu hwebhatiri. Dendrite lithium inokura kubva pamusoro peiyo negative electrode yakananga ku diaphragm. Kana lithium simbi ikaramba ichiiswa, inozopedzisira yaBoora diaphragm uye kukonzera bhatiri pfupi dunhu, zvichikonzera matambudziko ekuchengetedza bhatiri.

Zvinhu zvinokanganisa:

Zvinhu zvikuru zvinokanganisa kuumbwa kwe dendrite lithium ndiyo roughness ye anode surface, concentration gradient ye lithium ion uye ikozvino density, etc. Mukuwedzera, SEI film, rudzi rwe electrolyte, solute concentration uye chinhambwe chinoshanda pakati pezvakanaka. uye ma electrode asina kunaka ese ane imwe pesvedzero pakuumbwa kwe dendrite lithium.

1. Negative pamusoro roughness

Kushata kweiyo negative electrode surface kunokanganisa kuumbwa kwe dendrite lithium, uye iyo yakanyanyisa pasi, iyo inonyanya kuita kuti iite dendrite lithium. Kuumbwa kwe dendrite lithium kunosanganisira zvinhu zvina zvikuru, kusanganisira electrochemistry, crystology, thermodynamics uye kinetics, iyo inotsanangurwa zvakadzama munyaya yaDavid R. Ely.

2. Gradient uye kugovera kwe lithium ion concentration

Mushure mekupukunyuka kubva muzvinhu zvakanaka, iyo lithium ion inopfuura nepakati pe electrolyte uye membrane kuti igamuchire maerekitironi pamagetsi asina kunaka. Munguva yekuchajisa, kuwanda kwelithium ion mupositive electrode kunowedzera zvishoma nezvishoma, ukuwo kuwanda kwelithium ions mumagetsi asina kunaka kunodzikira nekuda kwekuramba kugamuchirwa kwemaerekitironi. Mune mhinduro yakanyungudutswa ine yakakwira ikozvino density, iyo ion concentration inova zero. Muenzaniso wakagadzwa naChazalviel naChazalviel unoratidza kuti kana iyo ion concentration yakaderedzwa kusvika ku0, iyo yakaipa electrode inoumba nzvimbo yenzvimbo yechaji uye inogadzira dendrite chimiro. Kukura kwechimiro chedendrite kwakafanana neiyo yeion migration rate mu electrolyte.

3. Kuwanda kwezvino

Muchinyorwa Dendrite Kukura muLithium/Polymer Systems, munyori anotenda kuti Kukura mwero wetipi yeDendrite Lithium ine hukama nehukuru hwazvino, sezvakaratidzwa mune inotevera equation:

Mufananidzo

Kana iyo density iripo yakaderedzwa, kukura kwe dendrite lithium kunogona kunonoka kune imwe nhanho, sezvakaratidzwa mumufananidzo uri pasi apa:

Mufananidzo

Ungadzivisa sei:

Iyo yekugadzira michina ye dendrite lithium ichiri kujeka, asi kune akasiyana ekukura modhi yelithium simbi. Zvinoenderana nekugadzirwa uye kupesvedzera zvinhu zve dendrite lithium, kuumbwa kwe dendrite lithium kunogona kudzivirirwa kubva kune zvinotevera zvinhu:

1. Dzora kupfava kwepamusoro kweanode zvinhu.

2. Hukuru hwezvimedu zvisina kunaka hunofanira kuva diki pane yakakosha thermodynamic radius.

3. Dzora kunyorova kwe electrodeposition.

4. Deredza simba re electroplating pasi pemutengo wakakosha. Uye zvakare, iyo yechinyakare yekuchaja uye yekuburitsa michina inogona kuvandudzwa, semuenzaniso, pulse modhi inogona kutariswa.

5. Wedzera electrolyte additives inodzikamisa iyo negative-electrolyte interface

6. Tsiva mvura ye electrolyte ine simba guru gel/solid electrolyte

7. Gadzira chikamu chekudzivirira chepamusoro chesimba guru lithium anode

Pakupedzisira, mibvunzo miviri yasiiwa kuti ikurukurwe pakupera kwechinyorwa:

1. Ndeipi iyo electrochemical reaction ye lithium ions? Imwe ndeyekuti lithium ions pamusoro pe graphite electrochemical reaction mushure mekutamisa hukuru hwakasimba, kusvika kune saturation state. Chechipiri, lithium ions inofamba ichienda mumagirafu magirafu kuburikidza nemiganhu yezviyo zve graphite microcrystals uye inopindira mu graphite.

2. Ko lithium ions inobata ne graphite kuti iite lithium carbon compound uye dendrite lithium synchronously kana sequentially?

Kugamuchirwa kukurukura, siya meseji ~