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P(VdF-HFP)-基离子液体复合聚合物电解质的阴极稳定性及热稳定性(英文) 被引量:3
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作者 崔闻宇 安茂忠 +1 位作者 杨培霞 张锦秋 《物理化学学报》 SCIE CAS CSCD 北大核心 2011年第1期78-84,共7页
以聚偏氟乙烯-六氟丙烯P(VdF-HFP)聚合物为基体,制备了含离子液体1-甲基-3-乙基咪唑六氟磷酸盐(EMIPF6)、用于锂离子电池的离子液体复合聚合物电解质[P(VdF-HFP)/LiPF6/EMIPF6/EC(碳酸乙烯酯)-PC(碳酸丙烯酯)].采用热重分析法以及燃烧... 以聚偏氟乙烯-六氟丙烯P(VdF-HFP)聚合物为基体,制备了含离子液体1-甲基-3-乙基咪唑六氟磷酸盐(EMIPF6)、用于锂离子电池的离子液体复合聚合物电解质[P(VdF-HFP)/LiPF6/EMIPF6/EC(碳酸乙烯酯)-PC(碳酸丙烯酯)].采用热重分析法以及燃烧实验测试了复合聚合物电解质的热稳定性.离子电导率测试表明,离子液体的存在显著改善了复合聚合物电解质的离子传输;循环伏安测试表明,添加剂EC和PC的加入提高了复合电解质的阴极稳定性,制得的离子液体复合聚合物电解质在0.3-4.3V电压范围内稳定存在.Li4Ti5O12和LiCoO2为电极材料、P(VdF-HFP)/LiPF6/EMIPF6/EC-PC为电解质的半电池表现出优良的循环性能,0.1C充放电倍率下,Li/LiCoO2和Li/Li4Ti5O12半电池的可逆容量分别为130和144mAh·g-1.但EC、PC在一定程度上降低了离子液体复合聚合物电解质的热稳定性. 展开更多
关键词 锂离子电池 离子液体 复合聚合物电解质 阴极稳定性 稳定性
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Effect of amounts of nitrogen-doped carbon coating on cyclic stability of NCM811 for lithium-ion batteries
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作者 JIANG Sheng-yu CHEN Shun-yi +7 位作者 HE Rui REN Yan LIANG Qi-dong ZHU Bin PAN Xiao-xiao ZHANG Wen-xian HUANG Cheng-huan ZHUANG Shu-xin 《Journal of Central South University》 2025年第3期853-866,共14页
Rich-nickel layered ternary NCM811 has been widely used in the field of electric vehicles ascribed to its high theoretical specific capacity.However,poor cycling stability and rate-performance hindered its further dev... Rich-nickel layered ternary NCM811 has been widely used in the field of electric vehicles ascribed to its high theoretical specific capacity.However,poor cycling stability and rate-performance hindered its further development.Herein,different amounts of nitrogen-doped carbon were wrapped on the surface of NCM811 via a facile rheological phase method by regulating the amount of dopamine hydrochloride.The effects of the coating amounts on the structure and electrochemical performance are investigated.The DFT calculation,XRD,SEM and XPS reveal that an appropriate amount of nitrogen-doped carbon coating could uniformly form a protective layer on the NCM811 surface and the introduced N could anchor Ni atoms to inhibit the Li^(+)/Ni^(2+)mixing,but excessive amount would reduce Ni^(3+)to Ni^(2+)so as to conversely aggravate Li^(+)/Ni^(2+)mixing.Among the samples,the NCM811-CN0.75 sample exhibits the most excellent electrochemical performance,delivering a high-rate capacity of 151.6 mA·h/g at 10C,and long-term cyclability with 82.2%capacity retention after 300 cycles at 5C,exhibiting remarkable rate-performance and cyclability. 展开更多
关键词 lithium-ion batteries NCM811 CATHODE surface modification cyclic stability
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First-principle investigation on stability of Co-doped spinel λ-Mn_(4-x)Co_xO_8 被引量:1
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作者 黄可龙 陈春安 +2 位作者 刘素琴 罗琼 刘志国 《Journal of Central South University of Technology》 EI 2007年第2期186-190,共5页
The mechanism of stability of Co-doped spinel λ-MnO_2 that is referred to as spinel Li_xMn_2O_4 (x=0) was studied by using the first-principle calculation method. The total energy and formation enthalpy can be decrea... The mechanism of stability of Co-doped spinel λ-MnO_2 that is referred to as spinel Li_xMn_2O_4 (x=0) was studied by using the first-principle calculation method. The total energy and formation enthalpy can be decreased remarkably due to the Co substation, resulting in a more stable structure of λ-Mn_xCr_(2-x)O_4. The bond order and DOS analysis were given in detail to explain the nature of stability improvement. The calculated results show that as the content of Co dopant increases, the bond order of Mn—O becomes larger and the peak of density of states around Fermi level shifts toward lower energy. The charge density distribution illustrates that the Mn—O bonding is ionic and partially covalent, and the covalent Mn-O bonding becomes stronger with the increase of Co dopant content. The results confirm that the Codoping will enhance the stability of λ-MnO_2 and hence improve the electrochemistry performance of Li_xMn_2O_4. 展开更多
关键词 FIRST-PRINCIPLES STABILITY electrochemical performance Co-doped λ-MnO2
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