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

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

【摘要】：近年來(lái),隨著可再生能源技術(shù)的快速發(fā)展,加速了人們對(duì)低成本、長(zhǎng)壽命、大容量?jī)?chǔ)能系統(tǒng)的需求。大規(guī)模儲(chǔ)能技術(shù)在增強(qiáng)未來(lái)電網(wǎng)的穩(wěn)定性、可靠性、安全方面將起著至關(guān)重要的作用。2006年美國(guó)麻省理工學(xué)院(MIT)Sadoway團(tuán)隊(duì)提出“全液態(tài)金屬電池”大規(guī)模儲(chǔ)能的概念,受到國(guó)內(nèi)外研究者的廣泛關(guān)注。全液態(tài)金屬電池不涉及隔膜與分離結(jié)構(gòu),具有電流密度高、循環(huán)壽命長(zhǎng)、制作簡(jiǎn)單和易于放大等優(yōu)點(diǎn),在大規(guī)模儲(chǔ)能中有著廣闊的應(yīng)用前景。本文通過(guò)混料試驗(yàn)設(shè)計(jì)方法,首先獲得適用于鋰基液態(tài)金屬電池的低熔點(diǎn)全鋰熔鹽組分配比,測(cè)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(fù)極的液態(tài)金屬電池的研究,進(jìn)行了鋰基電池體系電極對(duì)的選擇,1.2Ah容量原型電池制備與電化學(xué)性能測(cè)試,10Ah放大容量電池的密封結(jié)構(gòu)設(shè)計(jì)、組裝與充放電性能測(cè)試等。使用 Design-Expert 軟件的混料設(shè)計(jì)模塊(Mixture design techniques),選用單純形格子設(shè)計(jì)(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(diǎn))測(cè)量值為444℃,460-520℃范圍內(nèi)的電導(dǎo)率測(cè)定值大于3.0S.cm-1、密度測(cè)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(zhì)(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(jìn)行了充放電循環(huán)測(cè)試。其中在150mA/cm2電流密度下實(shí)現(xiàn)98%的庫(kù)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(dá)到85.8%。電池的性能測(cè)試表明,液態(tài)金屬和熔鹽之間的電極-電解質(zhì)界面上有超快的電荷轉(zhuǎn)移動(dòng)力學(xué),液態(tài)金屬電極內(nèi)部有快速的物質(zhì)傳輸。開展10Ah全密封電池的結(jié)構(gòu)設(shè)計(jì)及試驗(yàn),提出鋰液內(nèi)置式集流器的設(shè)計(jì)概念。通過(guò)1OAh電池多次的組裝與測(cè)試,研究發(fā)現(xiàn),放電過(guò)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，

本文編號(hào)：1384978