Our laboratory focus on two major energy issues of power generation and energy storage, focusing on the use of inorganic compound materials to make thin film solar cells and solid-state lithium batteries.
I. All Solid State Battery
Compared with traditional lithium batteries, lithium metal batteries using solid electrolytes have higher safety and better energy density, so they became the highly anticipated technology. The research direction of our laboratory will focus on the production of oxide ceramic thin-film electrolytes, ceramic-polymer composite electrolytes, and all-solid-state thin-film batteries, with on-site electron microscope observation. We hope that the safety and performance of solid-state lithium batteries can be higher through these studies. |
(i) Oxide ceramic thin film electrolyte and all solid-state thin film battery
The garnet-type solid electrolyte has excellent resistance to lithium dendrites. The ionic conductivity of the garnet-type solid electrolyte can be further improved by doping elements. We focus on the production of garnet-type oxide ceramic electrolyte membranes, and improve the interface between the electrolyte and the negative electrode and the positive electrode. The negative electrode, electrolyte, and positive electrode are all stacked in a thin film to form an all-solid-state thin-film battery of miniature energy storage component. This micro-component can further increase the energy and power density, and can be used in various applications such as the Internet of Things (IoT) and cost-effective electronic products in the future.
The garnet-type solid electrolyte has excellent resistance to lithium dendrites. The ionic conductivity of the garnet-type solid electrolyte can be further improved by doping elements. We focus on the production of garnet-type oxide ceramic electrolyte membranes, and improve the interface between the electrolyte and the negative electrode and the positive electrode. The negative electrode, electrolyte, and positive electrode are all stacked in a thin film to form an all-solid-state thin-film battery of miniature energy storage component. This micro-component can further increase the energy and power density, and can be used in various applications such as the Internet of Things (IoT) and cost-effective electronic products in the future.
(ii) Ceramic-Polymer Composite Electrolyte
Designing a colloidal composite electrolyte lithium battery between solid and liquid, and using tantalum doped lithium lanthanum zirconium oxide (LLZTO) as the active filler,it can effectively improve the ion conductivity and enhance the compatibility of the electrode and electrolyte interface,and it also can improve the mechanical strength of the electrolyte thus deters the growth of lithium dendrites. The colloidal composite electrolyte lithium battery removes the highly flammable liquid electrolyte to improve safety and has a high degree of stability during long-term charge and discharge cycles. It has high potential for future applications in electric vehicle energy storage equipments.
Designing a colloidal composite electrolyte lithium battery between solid and liquid, and using tantalum doped lithium lanthanum zirconium oxide (LLZTO) as the active filler,it can effectively improve the ion conductivity and enhance the compatibility of the electrode and electrolyte interface,and it also can improve the mechanical strength of the electrolyte thus deters the growth of lithium dendrites. The colloidal composite electrolyte lithium battery removes the highly flammable liquid electrolyte to improve safety and has a high degree of stability during long-term charge and discharge cycles. It has high potential for future applications in electric vehicle energy storage equipments.
(iii) In-situ SEM observation
The initial decrease in impedance at the interface between the solid electrolyte and lithium metal may contribute to the stability of the solid-state battery, but we still don’t clear about the mechanism of the mechanical properties of the interface. How the existence of the intermediate layer at the interface changes the deposition principle during the electrochemical reaction and how the existence of the intermediate layer affects the growth of lithium at the interface with specific defects are also the focus. At present, we make the electrical measurements for the solid electrolyte of all solid-state lithium batteries, and also study the chemical and physical stability of the electrode/solid electrolyte interface, and discuss the electrochemical reaction process and in-situ observation to explore the interface mechanism, and find out how to improve the present lithium batteries.
II. Thin film compound solar cell
The copper indium gallium selenium compound with chalcopyrite structure has a relatively high light absorption coefficient, so it can effectively absorb most of the sunlight at a solar panel whith thickness is only 2 mm, and is further fabricated into a light, thin, and flexible solar cell. In addition, copper indium gallium selenide has excellent radiation resistance due to the essential defects of the material, and can be quickly repaired after the bombardment of high-energy protons or electrons, and is expected to be applied to the new generation of space solar cells. The research direction of this laboratory will focus on the discussion of the defect change, radiation bombardment and repair mechanism of the alkali metal treatment on the copper indium gallium selenium compound, and the use of variable temperature optical and electrical measurement to conduct the discussion. |
(i) Copper indium gallium selenium solar cell treated with alkali metal
Thin-film solar cells came out in the 1970s, and until the 1990s, the American Renewable Energy Laboratory NREL doped Ga element in CIS, which is now CIGS, and it is also the copper indium gallium selenium solar cell that we mainly research. However, Na accidentally became an important role in improving the photoelectric conversion efficiency of CIGS under the pollution of a certain experiment. After decades of evolution, the impact of other alkali metals such as K, Rb, Cs, etc. Material defects is the key to LET the conversion efficiency beyond 20% step by step. By measuring the temperature-variable optical and electrical measurements of various alkali metal processed samples, it is expected to further clarify the important key to improving the efficiency of the device.
Thin-film solar cells came out in the 1970s, and until the 1990s, the American Renewable Energy Laboratory NREL doped Ga element in CIS, which is now CIGS, and it is also the copper indium gallium selenium solar cell that we mainly research. However, Na accidentally became an important role in improving the photoelectric conversion efficiency of CIGS under the pollution of a certain experiment. After decades of evolution, the impact of other alkali metals such as K, Rb, Cs, etc. Material defects is the key to LET the conversion efficiency beyond 20% step by step. By measuring the temperature-variable optical and electrical measurements of various alkali metal processed samples, it is expected to further clarify the important key to improving the efficiency of the device.
(ii) Discussion on the mechanism of radiation bombardment and repairment
The chalcopyrite CIGS with p-type characteristics dominated by shallow defect ( copper vacancies ) (VCu) has great anti-radiation properties, resulting in very high recovery force after radiation (protons/electrons), with simulation software and the basic characteristics of current and voltage of solar cells, photoluminescence (PL), time-resolved photoluminescence spectroscopy (TRPL), admittance spectroscopy (AS), impedance measurement (Electrochemical Impedance Spectroscopy, EIS) , Transient Photocurrent (TPC), Transient Photovoltage (TPV), etc., will further clarify the self-repair mechanism inside the material.Paragraph. |
本實驗室主攻發電與儲能兩大能源議題,著重在使用無機化合物材料製作化合物太陽能電池與固態鋰金屬電池。
I. 全固態電池
相較於傳統鋰電池而言,使用固態電解質之鋰金屬電池有更高的安全性和更佳的能量密度,因此成為一項備受矚目的技術。本實驗室研究方向將著重在製作氧化物陶瓷薄膜電解質、陶瓷-聚合物複合電解質、以及全固態薄膜電池,並搭配臨場通電之電鏡觀測。期望透過這些研究,開發高安全性與高效能之固態鋰電池。
相較於傳統鋰電池而言,使用固態電解質之鋰金屬電池有更高的安全性和更佳的能量密度,因此成為一項備受矚目的技術。本實驗室研究方向將著重在製作氧化物陶瓷薄膜電解質、陶瓷-聚合物複合電解質、以及全固態薄膜電池,並搭配臨場通電之電鏡觀測。期望透過這些研究,開發高安全性與高效能之固態鋰電池。
(i) 氧化物陶瓷薄膜電解質暨全固態薄膜電池
石榴石型固態電解質具有優異的抗鋰枝晶特性。透過摻雜元素可進一步提升石榴石型固態電解質之離子導率。我們著重在製作石榴石型氧化物陶瓷電解質薄膜,並改善電解質與負極、正極之介面,將負極、電解質、正極皆以薄膜狀堆疊成為微型儲能元件之全固態薄膜電池。此微型元件可進一步提升能量與功率密度,未來可應用於物聯網(IoT)、高性價比之電子產品等多樣用途。
石榴石型固態電解質具有優異的抗鋰枝晶特性。透過摻雜元素可進一步提升石榴石型固態電解質之離子導率。我們著重在製作石榴石型氧化物陶瓷電解質薄膜,並改善電解質與負極、正極之介面,將負極、電解質、正極皆以薄膜狀堆疊成為微型儲能元件之全固態薄膜電池。此微型元件可進一步提升能量與功率密度,未來可應用於物聯網(IoT)、高性價比之電子產品等多樣用途。
(ii) 陶瓷-聚合物複合電解質
設計介於固態和液態之間膠態複合電解質鋰電池,並使用鉭參雜鋰鑭鋯氧(LLZTO)作為活性填料可以有效提升離子導率以及增強電極和電解質界面的兼容性,並且能提升電解質的機械強度從而抑制鋰枝晶的生長。膠態複合電解質鋰電池移除高度可燃性液態電解液提升安全性以及在長期充放電循環中具有高度穩定性,未來應用在電動車儲能設備上具有高度潛力。
設計介於固態和液態之間膠態複合電解質鋰電池,並使用鉭參雜鋰鑭鋯氧(LLZTO)作為活性填料可以有效提升離子導率以及增強電極和電解質界面的兼容性,並且能提升電解質的機械強度從而抑制鋰枝晶的生長。膠態複合電解質鋰電池移除高度可燃性液態電解液提升安全性以及在長期充放電循環中具有高度穩定性,未來應用在電動車儲能設備上具有高度潛力。
c. 臨場通電之電鏡觀測
固體電解質和鋰金屬之間的界面處一開始的阻抗降低可能有助於固態電池的穩定性,但對於該界面的機械性質還不清楚其機制。在界面上中間層的存在如何改變電化學反應期間的沉積原理以及中間層的存在如何影響有特定缺陷的界面處的鋰生長也都是討論的重點。目前針對全固態鋰電池的固體電解質做電性量測,研究電極/固體電解質界面的化學和物理穩定性。探討電化學反應過程並進行臨場觀測,探討界面機理,並找出改善的解決方法。
固體電解質和鋰金屬之間的界面處一開始的阻抗降低可能有助於固態電池的穩定性,但對於該界面的機械性質還不清楚其機制。在界面上中間層的存在如何改變電化學反應期間的沉積原理以及中間層的存在如何影響有特定缺陷的界面處的鋰生長也都是討論的重點。目前針對全固態鋰電池的固體電解質做電性量測,研究電極/固體電解質界面的化學和物理穩定性。探討電化學反應過程並進行臨場觀測,探討界面機理,並找出改善的解決方法。
II. 薄膜化合物太陽能電池
具黃銅礦結構之銅銦鎵硒化合物具有相當高的光吸收係數,因此在僅2毫米的厚度下有效吸收大部分的太陽光,進一步製作為輕、薄、可撓的軟性太陽能電池。此外,銅銦鎵硒因材料的本質缺陷而有著優異的抗輻射性能,在高能質子或電子之轟擊後仍可迅速修復,有望應用在新世代太空用太陽能電池。本實驗室研究方向將著重在鹼金屬處理對於銅銦鎵硒化合物之缺陷變化、輻射線轟擊與修復機制探討,並利用變溫光學及電性量測進行探討。
具黃銅礦結構之銅銦鎵硒化合物具有相當高的光吸收係數,因此在僅2毫米的厚度下有效吸收大部分的太陽光,進一步製作為輕、薄、可撓的軟性太陽能電池。此外,銅銦鎵硒因材料的本質缺陷而有著優異的抗輻射性能,在高能質子或電子之轟擊後仍可迅速修復,有望應用在新世代太空用太陽能電池。本實驗室研究方向將著重在鹼金屬處理對於銅銦鎵硒化合物之缺陷變化、輻射線轟擊與修復機制探討,並利用變溫光學及電性量測進行探討。
a. 鹼金屬處理之銅銦鎵硒太陽能電池
薄膜太陽能電池於1970年代問世,直至1990年代時美國再生能源實驗室NREL在CIS中摻雜Ga元素,即現在的CIGS,也是我們主要研究的銅銦鎵硒太陽能電池。然而在某次實驗的污染下,Na意外成為提高CIGS光電轉換效率的重要角色。在數十年的演變之下,其他鹼金屬如K、Rb、Cs等對材料缺陷所造成的影響更是一步步開啟超越20%轉換效率的關鍵。藉由量測各種鹼金屬處理樣品之變溫光學及電性量測可望進一步釐清提升元件效率的重要關鍵。
薄膜太陽能電池於1970年代問世,直至1990年代時美國再生能源實驗室NREL在CIS中摻雜Ga元素,即現在的CIGS,也是我們主要研究的銅銦鎵硒太陽能電池。然而在某次實驗的污染下,Na意外成為提高CIGS光電轉換效率的重要角色。在數十年的演變之下,其他鹼金屬如K、Rb、Cs等對材料缺陷所造成的影響更是一步步開啟超越20%轉換效率的關鍵。藉由量測各種鹼金屬處理樣品之變溫光學及電性量測可望進一步釐清提升元件效率的重要關鍵。
b.輻射線轟擊與修復機制探討
由淺層缺陷銅空缺(VCu)主導形成p-type特性的黃銅礦CIGS具有極大的抗輻射特性,導致在輻射線(質子/電子)照射後仍有極高的回復力,搭配模擬軟體以及太陽能電池的電流電壓基本特性、光激發螢光(Photoluminescence, PL)、時間解析光激發螢光光譜(TRPL)、導納頻譜法(Admittance Spectroscopy, AS)、阻抗量測(Electrochemical Impedance Spectroscopy, EIS)、瞬態光電流響應(Transient Photocurrent, TPC)、瞬態光電壓(Transient Photovoltage, TPV)等,將可進一步釐清材料內部的自修復機制。
由淺層缺陷銅空缺(VCu)主導形成p-type特性的黃銅礦CIGS具有極大的抗輻射特性,導致在輻射線(質子/電子)照射後仍有極高的回復力,搭配模擬軟體以及太陽能電池的電流電壓基本特性、光激發螢光(Photoluminescence, PL)、時間解析光激發螢光光譜(TRPL)、導納頻譜法(Admittance Spectroscopy, AS)、阻抗量測(Electrochemical Impedance Spectroscopy, EIS)、瞬態光電流響應(Transient Photocurrent, TPC)、瞬態光電壓(Transient Photovoltage, TPV)等,將可進一步釐清材料內部的自修復機制。