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      English  |  中國科學院
         
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      現在位置:首頁 > 新聞動態 > 科研進展
      化學所在高性能鋰離子電池電極材料上取得新進展
      2019-06-03 | 編輯:guojie | 【 】【打印】【關閉

        能量密度的提升是鋰離子電池領域的研究重點,而正極材料是決定鋰離子電池能量密度的關鍵。鎳錳酸鋰材料是一種高電壓的正極材料,具有高能量密度和良好的倍率性能;然而,其自身的高工作電壓會顯著加速電極材料表面的副反應,嚴重損害電極材料的結構穩定性和長循環性能,限制了它在高比能動力電池中的應用。  

        在國家自然科學基金和中科院先導項目等支持下,中國科學院化學研究所分子納米結構與納米技術院重點實驗室曹安民課題組在電極材料結構控制及穩定性提升上開展了系列工作,基于多級表界面結構設計(J. Am. Chem. Soc. 2018, 140, 7127J. Am. Chem. Soc. 2018, 140, 9070)、表面晶格調控(Chem 2018, 4, 1685-1695ACS Appl. Mater. Interfaces 2018, 10, 22896)等方式,實現了材料表界面活性的有效控制,獲得了電極材料穩定性及器件長循環性能的顯著提升。 

        最近,相關研究團隊提出了一種基于表面納米精度的限域相變提升電極材料穩定性的機制:基于可控的表面高溫固相反應,引入鋅離子促進鎳錳酸鋰的表面尖晶石結構轉變為類巖鹽相、層狀相兩者的復合構型,精確調控兩相比例,在不犧牲材料電化學活性的前提下提升了材料的結構穩定性。這種特殊的表面相態調控機制能夠克服常規表面惰性包覆方式對電荷傳輸的損害,為基于電極材料自身表面化學特性調控,獲得兼具高容量、高穩定性的關鍵電極材料提供了新的手段和機制,相關工作發表在(J. Am. Chem. Soc. 2019, 141, 4900-4907)。 

        1 Zn2+促使尖晶石結構表面產生相變:精確控制固相反應,獲得層狀和類巖鹽共存的表面兩相區,基于相結構和構成的優化提升電極材料的穩定性 

                                   

       分子納米結構與納米技術院重點實驗室 

      201963

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