【重點推薦】二氧化矽基玻璃,更棒的正極材料

   SiO2基玻璃結構強度比B2O3基和P2O5基更高，但很少被用作鋰離子電池正極材料。清華大學南策文院士、趙世璽副教授研究團隊和美國華盛頓大學曹國忠教授製備了一種新型SiO2基玻璃正極材料，並將研究成果發表在Journal of Materiomics第5卷第4期，題目為Electrochemical performance of Li2O-V2O5-SiO2-B2O3 glass as cathode material for lithium ion batteries。您可以點擊文末「閱讀全文」免費下載！

Zhao E-L, Zhao S-X, Wu X, et al. Electrochemical performance of Li2O-V2O5-SiO2-B2O3 glass as cathode material for lithium ion batteries[J]. Journal of Materiomics, 2019, 5(4): 663-669. 此外，小編為各位奉上了更多新能源電池文章！請點擊下方連結查看。

2019年鋰離子電池、固態電池匯總

【電化學專題】元素替換法提高固態燃料電池負極性能

【電化學專題】提高固態電池離子傳導性的妙招

【高通量】利用高通量計算研究鋰離子電池

   採用熔融-淬冷法製備了20Li2O-30V2O5-(50-x)SiO2-xB2O3 (mol.%) (x= 10%,20%, 30%, 40%)，分別命名為LVSB10, LVSB20, LVSB30和LVSB40。所有樣品均為非晶體；隨著矽含量的增加，玻璃網絡結構更加穩定，玻璃化轉變溫度更高；不同的樣品具有不同的熔化溫度。此外，樣品的Si和B的比例不同，V4+所佔分數不同。

    從顯微形貌和元素分布可知，樣品的晶粒尺寸為微米級，元素分布均勻，且沒有出現衍射斑，進一步證明了樣品為非晶體。

Fig. 4. (a) SEM image, (b) grain size distribution diagram, (c) corresponding EDS result, (d) HRTEM image at high resolution and corresponding SAED pattern (inset) of LVSB10 glass sample.

   在所有樣品中，樣品LVSB10的V4+含量最高，具有最佳的電子電導率。越多的V4+，通常會具有更多的小極化子跳躍，從而實現更高的電導率。樣品LVSB10首次放電容量和循環性能比其他樣品優異，但隨著循環次數增加，容量衰減迅速。

Fig. 5. The charge/discharge curves of LVSB10, LVSB20, LVSB30 and LVSB40 glass samples after (a) 1st cycle, (b) 50th cycle and Ex-situ V 2p2/3 XPS spectra of LVSB10 electrode at (c)
4.2 V and (d)1.5 V for first cycle.

   因此，通過球磨處理樣品LVSB10以減小顆粒尺寸。 結果發現，球磨沒有改變其非晶體的性質，但減小了粒徑。球磨後，樣品LVSB10-b的放電容量增加，循環性能和倍率性能得到大幅度改善，這是由於電荷轉移阻抗降低和Li+擴散能力改善。

Fig. 6. (a) SEM image, (b) grain size distribution diagram, (c) HRTEM image at high resolution and corresponding SAED pattern (inset), (d) XRD pattern of LVSB10 glass sample.

Fig. 7. (a) The cycling performance, (b) rate capacity, (c) Nyquist plots and (d) corresponding Z』 - u0.5 plots of LVSB10 glass sample and LVSB10-b sample.

Li2O-V2O5-SiO2-B2O3 (LVSB) glass was first reported as cathode material for L-ion batteries.

LVSB10 glass with the highest V4+ ratio.

The ball milled LVSB10 sample showed better discharge capacity, cycling stability.

Dr.Shi-Xi Zhao is an associate professor at Graduate Shool at Shenzhen, Tsinghua University. He received his Ph.D. (2002) in materials science from Wuhan University of Technology. From 2002 to 2004, Dr. Zhao engaged in postdoctoral research at the Department of Chemistry, Tsinghua University. From August 2004, he has worked at Graduate Shool at Shenzhen, Tsinghua University. His current research is focused mainly on Li-ion battery and supercapacitor materials, and functional ceramics. He has published over sixty academic paper and holds eight Chinese patents.

  Journal of Materiomics（JMAT），是由中國矽酸鹽學會和Elsevier合作出版的英文期刊。第3期完整版已上線，並且今年特推出柔性電子材料特刊，點擊文末「閱讀全文「可免費獲取所有論文全文。   Journal of Materiomics 為同行評議期刊,被SCI和scopus收錄，影響因子5.797(Material Science, multidisciplinary Q1分區)，Citescore為8.,6，從投稿到在線出版一般在60天以內，並且對作者免收版面費！   The Journal of Materiomics is indexed by SCI  (IF=5.797, rank in Q1 of Material Science, multidisciplinary) and Scopus (Citescore 8.6), aims to provide a continuous forum for the dissemination of research in the general field of materials science, particularly systematic studies of the relationships among composition, processing, structure, property, and performance of advanced materials. Supported by the Chinese Ceramic Society, the Journal of Materiomics is a peer-reviewed open-access journal, without publishing charges to authors.   For more information on submitting to Journal of Materiomics, Please read journal’s specific Guide for Author:https://www.journals.elsevier.com/journal-of-materiomics