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鉛青化成制正極活性物質(zhì)的不同結(jié)構(gòu) |
| 由不同相組成的鉛青通過(guò)化成制得的正極活性物質(zhì)有不同的結(jié)構(gòu)，通過(guò)掃描電鏡分析表明：正極活性物質(zhì)是由不同形狀的凝聚塊的枝狀構(gòu)架所組成，帶有許多大孔的凝聚塊彼此連接成溝渠，這是由大孔結(jié)構(gòu)或大大小小的正極活性物質(zhì)凝聚塊形成的骨架的組成體。在高倍電鏡下看到凝聚塊是由大量的針狀或棱柱狀晶體組成的，這意味著上述晶粒是正極活性物質(zhì)的最小結(jié)構(gòu)單元，這些最小結(jié)構(gòu)單元―不同形態(tài)學(xué)的單個(gè)晶粒，在每個(gè)凝聚體內(nèi)各晶體之間有許多微孔，這些微孔的數(shù)量與體積大小，都取決于晶體的形態(tài)學(xué)。在凝聚體內(nèi)晶體與微孔的總體，在這個(gè)層面上而言對(duì)正極活性物質(zhì)，就是微觀(guān)結(jié)構(gòu)與晶體。 可以預(yù)言，在正極工作時(shí)有兩種不同功能的結(jié)構(gòu)層面：在電解液與Pbo：晶體之間，這個(gè)系統(tǒng)中有硫酸的流動(dòng)，有水的流動(dòng)以及離子的遷移（運(yùn)動(dòng)），微孔會(huì)產(chǎn)生-個(gè)很大的活性表面，這個(gè)表面上發(fā)生電化學(xué)反應(yīng)，在這個(gè)表面上必然在很大程度上決定了極板的容量。作為凝聚體是-個(gè)機(jī)械的骨架傳輸電流，作為-個(gè)傳輸系統(tǒng)會(huì)與小晶體Pbo：保持-體。 The lead that mutually constitutes to°from the dissimilarity is green to pass to become to make of cathode the live material contain different structure and pass a scanning electricity mirror to analyze enunciation:The cathode live material is constituted by the -like in shape frame that is coagulated a piece by the different shape and take to have coagulating of many big boreses piece each other links into ditch, this is the constituting of framework that is coagulated a piece of formation by the big bore structure or the various cathode live material body.At Gao Bei Dian mirror the bottom see coagulate a piece from a great deal of needle-like in shape or Leng the pillar-like in shape crystal constitute of, this means that the above-mentioned crystal grain is a cathode the minimum structure unit of activity material, these minimum structure unit ― the different appearance learns of single crystal grain, coagulate an of each crystal inside the body to have many tiny bores in each one, the amount and physical volume size of these tiny bores, all be decided by the appearance of crystal to learn.At coagulate crystal inside the body with tiny bore of total, on this level but speech to cathode the live material is tiny view structure and crystal. Can predict, have two kinds of structure levels of different functions when the cathode works:In the electrolyte and Pbo:Of crystal, there is the fluxion of sulfuric acid in this system, there are aqueous fluxion and the migration(exercise) of ion, the tiny bore will produce- very big live surface, this superficial occurrence gives or gets an electric shock chemical reaction, at this superficially and by all means and to a large extent come to a decision pole knothole capacity.Conduct and actions coagulates a body BE- machine of the framework deliver electric current, conduct and actions-deliver system meeting and small crystal Pbo:Keep-body. |
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