能源紧缺和环境污染问题日益严重,因此电池的研究受到高度重视。目前,对于锂电池的检测技术发展并不成熟,特别是对于锂电池内阻的测量存在很大的不足。而锂电池的内阻又是荷电状态(SOC)和健康状态(SOH)估计的关键参数。针对提高锂电池...能源紧缺和环境污染问题日益严重,因此电池的研究受到高度重视。目前,对于锂电池的检测技术发展并不成熟,特别是对于锂电池内阻的测量存在很大的不足。而锂电池的内阻又是荷电状态(SOC)和健康状态(SOH)估计的关键参数。针对提高锂电池内阻测量精度的目的,采用四线法的原理设计了锂电池内阻测量的实际电路,通过在交流阻抗法的基础上根据同步积分法的原理对锂电池的内阻进行测量。并利用Simulink的DSP builder模块建模仿真得到同步积分法在加入20 d B高斯噪声的干扰下,具有很好的去噪声效果,通过取样积分法的幅度取值可知测量误差能够达到4%以内,甚至更小。展开更多
A Sb-Fe-carbon-fiber （CF） composite was prepared by a chemical vapor deposition （CVD） method with in situ growth of CFs us- ing Sb203/Fe2O3 as the precursor and acetylene （C2H2） as the carbon source. The Sb-Fe-C...A Sb-Fe-carbon-fiber （CF） composite was prepared by a chemical vapor deposition （CVD） method with in situ growth of CFs us- ing Sb203/Fe2O3 as the precursor and acetylene （C2H2） as the carbon source. The Sb-Fe-CF composite was characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM） and transmission electron microscopy （TEM）, and its electrochemical per- formance was investigated by galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy. The Sb-Fe-CF composite shows a better cycling stability than the Sb-amorphous-carbon composite prepared by the same CVD method but using Sb2O3 as the precur- sor. Improvements in cycling stability of the Sb-Fe-CF composite can be attributed to the formation of three-dimensional network structure by CFs, which can connect Sb particles firmly. In addition, the CF layer can buffer the volume change effectively.展开更多
文摘能源紧缺和环境污染问题日益严重,因此电池的研究受到高度重视。目前,对于锂电池的检测技术发展并不成熟,特别是对于锂电池内阻的测量存在很大的不足。而锂电池的内阻又是荷电状态(SOC)和健康状态(SOH)估计的关键参数。针对提高锂电池内阻测量精度的目的,采用四线法的原理设计了锂电池内阻测量的实际电路,通过在交流阻抗法的基础上根据同步积分法的原理对锂电池的内阻进行测量。并利用Simulink的DSP builder模块建模仿真得到同步积分法在加入20 d B高斯噪声的干扰下,具有很好的去噪声效果,通过取样积分法的幅度取值可知测量误差能够达到4%以内,甚至更小。
基金supported by the Zijin Program of Zhejiang Universitythe Fundamental Research Funds for the Central Universities (No.2010QNA4003)+1 种基金the Ph.D. Program Foundation of the Ministry of Education of China (No.20100101120024)the Foundation of Education Office of Zhejiang Province, China (No.Y201016484)
文摘A Sb-Fe-carbon-fiber （CF） composite was prepared by a chemical vapor deposition （CVD） method with in situ growth of CFs us- ing Sb203/Fe2O3 as the precursor and acetylene （C2H2） as the carbon source. The Sb-Fe-CF composite was characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM） and transmission electron microscopy （TEM）, and its electrochemical per- formance was investigated by galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy. The Sb-Fe-CF composite shows a better cycling stability than the Sb-amorphous-carbon composite prepared by the same CVD method but using Sb2O3 as the precur- sor. Improvements in cycling stability of the Sb-Fe-CF composite can be attributed to the formation of three-dimensional network structure by CFs, which can connect Sb particles firmly. In addition, the CF layer can buffer the volume change effectively.
