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层状Li(Ni_1-xCo_x)O₂首次可逆行为研究

Study on the first reversible behavior of the layered Li(Ni_1-xCo_x)O₂

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【Author】 GU Yi-Jie1,2,KONG Huan1,HUANG Xiao-wen1,CUI Hong-zhi1,WANG Cui-ling1, YANG Zhi-ning1,WU Hui-kang2,ZHOU Heng-hui3,WEI Qing3 ( 1. College of Materials Science and Engineering,Shandong University of Scie nce and Technology,Qingdao Shandong 266510,China; 2.New Energy Materials R&D Centre,Qingdao Aucma Co.,Ltd.,Qing dao,Shandong 266510, China; 3.College of Chemistry and Molecular Engineering,Perking University ,B eijing 100871,China)

【机构】山东科技大学材料学院；青岛澳柯玛集团有限公司新能源材料研发中心；北京大学化学与分子工程学院；北京大学化学与分子工程学院山东青岛266510 青岛澳柯玛集团有限公司新能源材料研发中心；山东青岛266510；北京100871；

【摘要】介绍了采用共沉淀法合成层状Li(Ni1-xCox)O2的实验方法,采用XRD和电化学方法对合成的层状Li(Ni1-xCox)O2进行了研究。研究结果表明:Co含量为0.3时首次可逆效率发生突变;Co含量小于0.3时,首次不可逆容量损失主要来自存在于Li层的Ni3+很难还原为Ni2+和Ni层中Ni-O八面体的不均匀膨胀,;Co含量大于0.3时,Ni4+转变为Ni3+过程中,Ni-O八面体不均匀膨胀是造成首次不可逆容量的主要原因。同时,随着Co含量的增加,锂离子脱嵌产生的应变减少也是造成首次不可逆容量减少的原因。更多还原

【Abstract】 With x=0.1,0.2,0.3,0.5 and 1,Li(Ni1-xCox)O2 was prepared by cop recipitation of Ni-and Co-salt in mixed solution with NaOH. The performance of the layered Li(Ni1-xCox)O2 was analyzed with XRD and electrochemical methods. The analysis results pointed out that the reason of the first irreversible capac ity loss was that the Ni3+existing in the Li layer was difficult to reduce into Ni2+and the extending of the Ni-O octahedron was unsymmetrical when Co conten t was less than 0.3. The first irreversible capacity mainly came from the Ni-O octahedron unsymmetrical extending when Co content was more than 0.3.更多还原