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熔融鹽法合成高密度鋰離子電池正極材料LiNi0.8Co0.2-xAlxO2
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國家自然科學基金資助(20671031)


Preparation of High-Density LiNi0.8Co0.2-xAlxO2 as Cathode Material for Lithium Ion Battery by Molten Salt Method
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    摘要:

    利用低共熔組成的0.38LiOH-0.62LiNO3混合鋰鹽體系，與高密度前驅體Ni0.8Co0.2-xAlx(OH)2(0≤x≤0.15)在低溫下自混合，無需前期研磨和后續(xù)洗滌，直接制備出高密度Co-Al共摻雜的鋰離子電池正極材料LiNi0.8Co0.2-xAlxO2(0≤x≤0.15)。X射線衍射分析結果表明，合成的LiNi0.8Co0.2-xAlxO2具有規(guī)整的層狀α-NaFeO2結構。掃描電鏡顯示產(chǎn)物顆粒均勻，LiNi0.8Co0.15Al0.05O2的振實密度達2.97 g·cm-3。電性能測試表明，在0.2 C放電倍率和3.0~4.3 V的電壓范圍內(nèi)，LiNi0.8Co0.15Al0.05O2首次放電比容量達167.5 mAh·g-1，且具有良好的循環(huán)性能

    Abstract:

    Co-Al co-doped cathode material LiNi0.8Co0.2-xAlxO2 (0≤x≤0.15) was directly synthesized without artificial grinding and washing by a eutectic molten-salt mixture (0.38LiOH-0.62LiNO3) method. According to this method, the eutectic molten-salt mixture was self-mixed with high tap density precursor Ni0.8Co0.2-xAlx(OH)2 thoroughly at low temperature and then sintered at a certain temperature. The tap-density of LiNi0.8Co0.15Al0.05O2 obtained is 2.97 g·cm-3. According to XRD and SEM, these LiNi0.8Co0.2-x AlxO2 materials have an order α-NaFeO2 layer structure and regular morphology. The charge-discharge tests show that the LiNi0.8Co0.15Al0.05O2 has an initial discharge capacity as high as 167.5 mAh·g-1 and excellent capacity retention in the range from 3.0 V to 4.3 V at a specific current of 0.2 C.

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湯宏偉,趙付雙,常照榮.熔融鹽法合成高密度鋰離子電池正極材料LiNi0.8Co0.2-xAlxO2[J].稀有金屬材料與工程,2010,39(2):333~337.[Tang Hongwei, Zhao Fushuang, Chang Zhaorong. Preparation of High-Density LiNi0.8Co0.2-xAlxO2 as Cathode Material for Lithium Ion Battery by Molten Salt Method[J]. Rare Metal Materials and Engineering,2010,39(2):333~337.]
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  • 收稿日期:2009-04-10
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