本文關鍵詞：鋰基液態(tài)金屬電池的研究　出處：《昆明理工大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 大規(guī)模儲能 液態(tài)金屬電池 充放電循環(huán)

【摘要】：近年來,隨著可再生能源技術的快速發(fā)展,加速了人們對低成本、長壽命、大容量儲能系統(tǒng)的需求。大規(guī)模儲能技術在增強未來電網的穩(wěn)定性、可靠性、安全方面將起著至關重要的作用。2006年美國麻省理工學院(MIT)Sadoway團隊提出“全液態(tài)金屬電池”大規(guī)模儲能的概念,受到國內外研究者的廣泛關注。全液態(tài)金屬電池不涉及隔膜與分離結構,具有電流密度高、循環(huán)壽命長、制作簡單和易于放大等優(yōu)點,在大規(guī)模儲能中有著廣闊的應用前景。本文通過混料試驗設計方法,首先獲得適用于鋰基液態(tài)金屬電池的低熔點全鋰熔鹽組分配比,測試出此組分熔鹽體系(LiF-LiCl-LiBr)最基本的物性數(shù)據(jù),然后開展以鋰為負極的液態(tài)金屬電池的研究,進行了鋰基電池體系電極對的選擇,1.2Ah容量原型電池制備與電化學性能測試,10Ah放大容量電池的密封結構設計、組裝與充放電性能測試等。使用 Design-Expert 軟件的混料設計模塊(Mixture design techniques),選用單純形格子設計(Simplex Lattice),優(yōu)化(optimization)得到的LiF-LiCl-LiBr熔鹽體系最低初晶溫度值為416.586°C,摩爾百分比為21.2:30.8:48.0。此成分的初晶溫度(熔點)測量值為444℃,460-520℃范圍內的電導率測定值大于3.0S.cm-1、密度測定值介于2.17-2.42g.cm-3之間,滿足鋰基液態(tài)金屬電池用熔鹽特性的要求。按1.2Ah的理論容量、Li-Pb-Sb摩爾比例為45:38:17的全放電成分,使用LiF-LiCl-LiBr共晶電解質(Tm=444℃),電池組裝后加熱控溫到490℃,在不同的電流密度下(150mA/cm2、300mA/cm2、500mA/cm2)進行了充放電循環(huán)測試。其中在150mA/cm2電流密度下實現(xiàn)98%的庫倫效率和87.5%的電壓效率,平均放電電壓為0.8V,能量效率達到85.8%。電池的性能測試表明,液態(tài)金屬和熔鹽之間的電極-電解質界面上有超快的電荷轉移動力學,液態(tài)金屬電極內部有快速的物質傳輸。開展10Ah全密封電池的結構設計及試驗,提出鋰液內置式集流器的設計概念。通過1OAh電池多次的組裝與測試,研究發(fā)現(xiàn),放電過程中正極上還原出的金屬Li不容易穿透較厚的Pb-Sb合金層,易在Pb-Sb合金層生成Li3Sb金屬間化合物。
[Abstract]:In recent years, with the rapid development of renewable energy technology, people's demand for low cost, long life, large capacity energy storage system has been accelerated. Large scale energy storage technology is enhancing the stability and reliability of power grid in the future. Security will play a vital role. In 2006, MIT / Sadoway team proposed the concept of "all-liquid metal cells" for large-scale energy storage. Full liquid metal battery has many advantages, such as high current density, long cycle life, simple fabrication and easy amplification. It has a broad application prospect in large-scale energy storage. In this paper, the low melting point total lithium molten salt distribution ratio for lithium-base liquid metal batteries is obtained by mixing experimental design method. The basic physical properties of the molten salt system LiF-LiCl-LiBrwere tested, and then the study of the liquid metal battery with lithium as negative electrode was carried out, and the selection of electrode pairs of lithium-base battery system was carried out. Preparation and Electrochemical performance Test of 1.2Ah capacity prototype Battery sealed structure Design of 10Ah Amplified capacity Battery. Assembly, charge-discharge performance test, etc. Mix design module using Design-Expert software, mix design technique). Simplex Lattice. The lowest initial crystal temperature of LiF-LiCl-LiBr molten salt obtained by optimizing optimization is 416.586 擄C. The molar percentage is 21.2: 30.8: 48.0.The primary crystal temperature (melting point) of this composition is 444 鈩，

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