超細晶鈦酸鋇基儲能陶瓷的性能與微觀結構

劉佰博; 王曉慧; 李龍土

doi:10.13374/j.issn2095-9389.2017.06.012

超細晶鈦酸鋇基儲能陶瓷的性能與微觀結構

doi: 10.13374/j.issn2095-9389.2017.06.012

清華大學新型陶瓷與精細工藝國家重點實驗室, 北京 100084

基金項目:

國家重點基礎研究發展計劃資助項目(2015CB654604)

國家自然科學基金創新研究群體項目(51221291)

國家自然科學基金資助項目(51272123)

詳細信息

中圖分類號: TB321
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出版歷程
- 收稿日期: 2016-10-19

Properties and microstructure of ultrafine-crystalline BaTiO3-based energy storage ceramics

State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China

摘要

摘要: 利用水基化學包覆法在納米鈦酸鋇粉體包覆氧化鋁、二氧化硅和氧化鋅等物質,并通過兩段式燒結法制備了平均晶粒尺寸120 nm的超細晶鈦酸鋇基儲能陶瓷.包覆層的存在抑制了晶粒生長和異常晶粒長大,同時將陶瓷的交流擊穿場強大幅提高至150 kV·cm^-1以上,儲能密度達到0.829 J·cm^-3.電子能量損失譜顯示,包覆摻雜的元素明顯偏聚于陶瓷晶界,形成具有芯-殼結構的晶粒.而高溫阻抗譜的測試和擬合結果則進一步解釋了陶瓷性能改善的原因.雖然此超細晶陶瓷的儲能密度并不十分突出,但其晶粒細小均勻、燒結溫度低,因而可用于制備多層陶瓷電容器,從而大幅提高儲能密度,這是常見的儲能陶瓷無法實現的.
- 儲能陶瓷 /
- 鈦酸鋇 /
- 晶粒尺寸 /
- 電滯回線 /
- 芯-殼結構
Abstract: Al₂O₃, SiO₂ and ZnO were coated around nano-sized BaTiO3 particles by means of aqueous chemical coating. Then, BaTiO 3 -based energy storage ceramic material with average grain size of 120 nm was fabricated by the two-step sintering method. The coating layer can restrain grain growth and abnormal grain growth, and can enhance significantly the AC breakdown strength of the material to over 150 kV·cm^-1, while providing energy density of 0.829 J·cm^-3. Energy-dispersive spectroscopy proves the gathering of doping elements near grain boundaries, thus indicating the existence of a core-shell structure. High-temperature impedance spectroscopy and fitting results further explain that the energy storage properties were improved. Although the energy density of this ultrafinecrystalline ceramic material is moderate, the advantages of fine grains and low sintering temperature make it possible for the material to be used in multilayer ceramic capacitors, which can increase energy storage by orders of magnitude. This improvement is impossible to achieve with conventional energy storage ceramics.
- energy storage ceramics /
- barium titanate /
- grain size /
- hysteresis loop /
- core-shell structure

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參考文獻(14)

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