全固態電池因其不可燃本質與傳統的鋰離子電池(Lithium-ion battery, LIB)相比更安全，能避免大量液態電解液造成潛在的漏液燃燒危險，且能直接使用鋰金屬當作負極，透過減少體積提高能量密度，使其成為未來的前景。電解質中又以固態硫化物因其擁有最高的導離子度與熱穩定性電解質最為突出，然而全固態電池中鋰沉積會受到集電器與電解質特性影響，不均勻鋰沉積會影響壽命與低庫倫效率，且當鋰金屬與硫化物接觸也會產生介面副反應。為了隔絕硫化物電解質與無陽極負極在鋰沉積剝離過程的鋰金屬接觸，以及抑制鋰枝晶的不均勻鋰沉積。開發與研究適合的無陽極負極保護層，是本研究的主軸。
研究策略上，主分四個部分。首先，利用化學鍍方式將奈米銀顆粒塗佈在不鏽鋼基材上，其功用作為鋰成核種，形成鋰銀合金，以達到均勻鋰沉積，進而提高電池壽命與安全性，於全電池NMC811_LIC∣p-LPSC&LIC∣SUS@Ag系統於面電容2.7 mAh/cm2下，庫倫效率最高可得94.68%。第二部分，選用二維金屬有機骨架 （MOF）作為負極介面層，期能誘導鋰離子在負極沉積時的均勻性。第三部分，則是在不銹鋼箔上引入碳材介穩相球狀碳(MCMB)與石墨烯(Graphene)緩衝層，除了可以避免沉積鋰和銀顆粒直接接觸硫化物固態電解質產生介面副反應，更可避免在合金與去合金化過程中的體積變化，造成電解質介面結構上的破壞，也有協助PVDF從Alpha相轉成Beta相的功用。於銀碳複合負極中MCMB-Ag複合負極於全電池下能改善極化現象，NMC811_LIC∣p-LPSC&LIC∣SUS@Ag@MCMB全電池系統中，其最高達庫倫效率97.55%。第四階段，引入Beta PVDF高分子層，一方面可以降低碳層導電子性避免鋰長在碳層上，另一方面亦可藉由高分子隔絕負極與硫化物介面，避免枝晶刺穿。但基於碳材本形貌缺陷、顆粒間縫隙使高分子無法完善塗佈應用於MCMB介面層，故將碳材改良改換成層狀石墨烯Graphene，改良過之高分子銀碳複合負極在NMC811_LIC∣p-LPSC&LIC∣SUS@Ag@Graphene@1%PVDF測試，進一步提升了全電池整體庫倫效率，最高可來到99.05%。

All-solid-state batteries are safer than traditional lithium-ion batteries (Lithium-ion batteries, LIBs) due to their non-flammable nature. This kind of battery avoids flammability and leakage of the liquid electrolyte. Besides, it can use lithium as an anode to increase energy density by decreasing the anode volume, making them a future perspective. Among various solid electrolytes, sulfide-type electrolyte stands out above the rest category of solid electrolytes as it has the highest ionic conductivity and best thermal stability. However, lithium deposition will be affected by the contact between the current collector and the electrolyte, and uneven lithium deposition will cause short circuit and low Coulombic efficiency in all-solid-state batteries. The interfacial side reactions will also occur when lithium metal contact with sulfide. In order to isolate the sulfide electrolyte from the anode electrode contact with lithium during plating and stripping, and to suppress the uneven lithium dendrites, we need to overcome the problems of uneven lithium deposition and interfacial side reactions, then develop a suitable anode-free anode.
In the research, there are four main stages. In the first part, silver nanoparticles are coated on the stainless steel substrate, and its function is used as nucleation seed to form lithium-silver alloys to achieve uniform lithium deposition and improve battery performance. The efficiency can reach up to 94.68% in the NMC811_LIC∣p-LPSC&LIC∣SUS@Ag full cell. In the second part, the two-dimensional metal-organic framework MOF is selected as the interfacial layer to induce the uniformity of lithium ions in the deposition. The third part is the layer of carbon MCMB and graphene, both of them can avoid the interfacial side reaction of deposited lithium and silver particles directly contacting the sulfide electrolyte, and it can also be used as buffer layer between the electrode and the solid electrolyte , prevents the volumetric expansion due to the alloying and dealloying process, causing damage to the electrolyte interface structure, and also assists the transformation of PVDF from Alpha phase to Beta phase. The MCMB-Ag composite anode can improve the polarization, and the NMC811_LIC∣p-LPSC&LIC∣SUS@Ag@MCMB full cell its highest Coulombic efficiency can reach to 97.55%. In the fourth stage, the Beta PVDF polymer layer is introduced. It can not only reduce the electrical conductivity of the carbon to prevent lithium from growing on the carbon surface but also isolate the interface between the electrode and the sulfide to avoid dendrite piercing. The polymer silver-carbon composite anode improved by polymer and carbon materials test in full cell system NMC811_LIC∣p-LPSC&LIC∣SUS@Ag@Graphene@1%PVDF elevated the overall Coulombic efficiency to 99.05%.

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