傳統儲能系統如鋰離子電池，由於其使用易燃、易揮發、易爆炸的有機電解液，在國內外已發生多起熱失控事件，存在其安全隱患的問題，並且能量密度基本已達到近理論上限。鋰硫電池因鋰陽極和硫陰極可提供3860 mA∙h g-1和1672 mA∙h g-1 的高理論電容，以及綠色環保和低成本，是下一代儲能設備的理想候選材料。然而，鋰硫電池面臨緩慢的反應動力學、低硫負載量在變化/放電過程中基於材料本身的相變，多硫化物會在陽極和陰極之間產生擴散，因而導致庫侖效率降低和鋰金屬表面導致電池失效。
在此，我們將Li2S-P2S5利用高能球磨法來合成硫化物固體電解質，並使用多硫化物作為鋰硫電池的陰極，以抑制鋰金屬的生長來提高電池的安全性；同時引入材料厚度之問題探討，期許在材料使用之餘可以達到商用的目的。本作品使用硫化物固態電解質替代可燃液態電解質且在室溫狀態下進行運作，並結合鋰硫電池的高比電容量，大幅提升了安全性。
此外本研究亦嘗試透過材料的設計與合成來解決固態電池之挑戰。我們在上述二元體系外添加了鹵素鋰鹽進行硫銀鍺礦型固態電解質合成出Li6PS5X，以簡易的方法製造出非晶形態的固態電解質。與二元體系相比，鹵素鋰鹽的摻雜(即X=F、Cl、Br、I)不僅增加了離子導電率，也增强了與Li金屬界面的穩定性。如摻雜F的固態電解質在循環的過程中產生含有LiF的SEI層，有助於增强界面的穩定性，以實現電池在循環過程中保持穩定的性能，並維持電量保有率。

Conventional energy storage systems, such as lithium-ion batteries, have suffered many thermal runaway incidents at home and abroad due to the use of organic electrolytes that are flammable, volatile, and explosive, and their energy density has basically reached its theoretical upper limit. Lithium-sulfur batteries as a promising candidate for next-generation energy storage devices because the lithium anode and sulfur cathode can provide high theoretical capacitance of 3860 mA∙h g-1 and 1672 mA∙h g-1 respectively, and they are also environmentally friendly and low-cost. However, lithium-sulfur batteries face slow reactive kinetics, low sulfur loading due to the material's own phase transition during the charge/discharge process, and polysulfide diffusion between the anode and cathode, which leads to a reduction in Coulombic efficiency and battery failure due to lithium metal surfaces. Here, we synthesize a binary system of Li2S-P2S5 using high-energy ball milling to synthesize sulfide solid electrolytes, and use polysulfides as the cathode of lithium-sulfur batteries to inhibit the growth of lithium metal to improve the safety of the batteries. This work uses sulfide solid electrolyte to replace the combustible liquid electrolyte and operates at room temperature, and combines the high specific electric capacity of lithium-sulfur batteries to greatly improve safety. In addition, this study also attempts to solve the challenge of solid-state batteries through material design and synthesis. Li6PS5X was synthesized by adding lithium halide to the above binary system to produce an amorphous solid-state electrolyte in a simple way. Compared with the binary system, the doping of lithium halides (i.e., X=F, Cl, Br, I) not only increases the ionic conductivity but also enhances the stability of the interface with Li metal. For example, the F-doped solid electrolyte produces a LiF-containing SEI layer during the cycling process, which helps to enhance the stability of the interface, thus realizing the stable performance of the battery during the cycling process and maintaining the power retention rate.

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