涂碳鋁箔在鋰硫電池中的應(yīng)用

涂碳鋁箔在鋰硫電池中的應(yīng)用Application of carbon-coated aluminum foil for Li-S secondary batteries

利用導(dǎo)電炭黑和導(dǎo)電石墨兩款碳材料制作涂碳鋁箔，將其作為鋰硫電池正極的集流體，考察箔材種類對電極性質(zhì)和電池性能的影響規(guī)律。結(jié)果表明：所制作的涂碳鋁箔具有“點(diǎn)-面”結(jié)合的導(dǎo)電架構(gòu)，其不僅可以改善硫電極的導(dǎo)電性，而且有利于增強(qiáng)活性物質(zhì)與集流體的粘結(jié)性、抑制電解液對鋁箔的腐蝕。涂碳鋁箔可以顯著降低電池的極化阻抗，維持穩(wěn)定的充放電平臺。相比使用傳統(tǒng)鋁箔，使用涂碳鋁箔的電池的活性物質(zhì)利用率更高，循環(huán)性能更為優(yōu)異，經(jīng)0.2C充放電循環(huán)40次后，其放電容量達(dá)到602 F/g，容量保持率為77.7%。

The carbon-coated aluminum (Al) foil was prepared by mixing two conductive carbon materials (carbon black+graphite) and studied as a current collector of Li-S battery. The effects of foil type on the electrode properties and cell performance were investigated. The results show that the carbon-coated Al foil possesses a point-surface combined conductive framework between active material layer and Al foil layer, which not only improves the conductivity of the sulfur electrode, but also enhances the adhesion of active material to current collector and inhibits the corrosion of the electrolyte to Al substrate. When using carbon-coated Al foil, the cell polarization is significantly reduced and stable charge-discharge platform is maintained. Compared to common Al foil, the carbon-coated Al foil favors more utilization of active material and more excellent cycle performance. The retained capacity reaches 602 F/g and capacity retention is 77.7% for the cell loading carbon-coated Al foil after 40 cycles at rate of 0.2C.

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