本文選題：固態(tài)電解質(zhì) + 聚氧化乙烯　； 參考：《儲能科學(xué)與技術(shù)》2016年05期

【摘要】：與采用液體電解液的傳統(tǒng)二次鋰離子電池相比,固態(tài)二次鋰電池在高能量密度和安全性方面具有顯著的潛在優(yōu)勢,近年來成為國內(nèi)外的研究熱點。作為固態(tài)二次鋰電池的核心組成,固態(tài)電解質(zhì)需要具備高離子電導(dǎo)率、寬電化學(xué)窗口、對鋰穩(wěn)定、力學(xué)性能優(yōu)以及可抑制鋰枝晶等特性。為達(dá)到以上要求,本工作探索制備了由納米鉭摻雜鋰鑭鋯氧(LLZTO)粉體與聚氧化乙烯(PEO)復(fù)合的有機(jī)-無機(jī)復(fù)合固態(tài)電解質(zhì)膜材料,對比研究了在有機(jī)物PEO中添加鋰鹽和不添加鋰鹽對固態(tài)電解質(zhì)膜電導(dǎo)率及電化學(xué)特性的影響。發(fā)現(xiàn)在PEO-LLZTO復(fù)合電解質(zhì)膜中,雖然PEO不導(dǎo)電,但界面處存在的滲流效應(yīng)可極大提高膜的總電導(dǎo)率,室溫離子電導(dǎo)率可達(dá)到2×10~(-4) S/cm。這一數(shù)值雖然略低于PEO-Li TFSI-LLZTO復(fù)合電解質(zhì)膜(室溫條件下電導(dǎo)率為6×10~(-4) S/cm),但無鋰鹽添加的PEO-LLZTO復(fù)合電解質(zhì)膜表現(xiàn)出較好的電化學(xué)穩(wěn)定性和較強(qiáng)的抑制鋰枝晶的能力。將PEO-LLZTO復(fù)合電解質(zhì)膜與Li/LiFePO_4和Li/Li Fe0.15Mn0.85PO4組裝成軟包電池,在0.1 C、60℃的測試條件下可充分發(fā)揮正極材料的容量,并可穩(wěn)定循環(huán)200次以上。
[Abstract]:Compared with conventional lithium-ion batteries with liquid electrolyte, solid-state secondary lithium-ion batteries have significant potential advantages in high energy density and safety, and have become a hot research topic in recent years. As the core component of solid-state secondary lithium battery, solid electrolyte should have high ionic conductivity, wide electrochemical window, stable lithium, excellent mechanical properties and restrain lithium dendrite. In order to meet the above requirements, an organic-inorganic composite solid electrolyte membrane material, composed of tantalum doped lithium zirconium oxide (LLZO) powder and polyvinyl oxide (PEO), was prepared. The effects of lithium salt and no lithium salt on the conductivity and electrochemical characteristics of solid electrolyte membrane were studied. It is found that in the PEO-LLZTO composite electrolyte membrane, although PEO is not conductive, the percolation effect at the interface can greatly improve the total conductivity of the membrane, and the ionic conductivity at room temperature can reach 2 脳 10 ~ (-4) S / cm. Although this value is slightly lower than that of PEO-Li TFSI-LLZTO composite electrolyte membrane (the conductivity is 6 脳 10 ~ (-4) S / cm ~ (-1) at room temperature, the PEO-LLZTO composite electrolyte membrane without lithium salt has good electrochemical stability and strong ability to inhibit lithium dendrite. The PEO-LLZTO composite electrolyte membrane was assembled with Li/LiFePO_4 and Li/Li Fe0.15Mn0.85PO4 to form a soft-clad battery. Under the test condition of 0.1C ~ (10) C ~ (60 鈩，

本文編號：1875291