锂离子电池负极材料标准解读

随着锂离子电池行业的兴起,其负极材料也得到了蓬勃发展。我国在锂离子电池领域所占据的市场份额仅次于日韩,已有多家负极材料厂商处于世界先进水平。为了促进锂离子电池负极行业的健康发展,我国从2009年开始就陆续颁布了相关标准,涉及原料、产品和检测方法,提出了各项参数的具体指标,并给出了相应的检测方法,对负极材料的实际生产和应用起到了指导性作用。本文介绍了这些标准的主要内容和要点,包括晶体结构、粒度分布、密度、比表面积、pH值、水含量、主元素含量、杂质元素含量、首次放电比容量和首次充放电效率。此外,本文还对今后的标准制定工作提出了部分建议

锂离子电池负极材料标准解读

随着锂离子电池行业的兴起,其负极材料也得到了蓬勃发展。我国在锂离子电池领域所占据的市场份额仅次于日韩,已有多家负极材料厂商处于世界先进水平。为了促进锂离子电池负极行业的健康发展,我国从2009年开始就陆续颁布了相关标准,涉及原料、产品和检测方法,提出了各项参数的具体指标,并给出了相应的检测方法,对负极材料的实际生产和应用起到了指导性作用。本文介绍了这些标准的主要内容和要点,包括晶体结构、粒度分布、密度、比表面积、pH值、水含量、主元素含量、杂质元素含量、首次放电比容量和首次充放电效率。此外,本文还对今后的标准制定工作提出了部分建议

锂离子电池负极材料标准解读

随着锂离子电池行业的兴起,其负极材料也得到了蓬勃发展。我国在锂离子电池领域所占据的市场份额仅次于日韩,已有多家负极材料厂商处于世界先进水平。为了促进锂离子电池负极行业的健康发展,我国从2009年开始就陆续颁布了相关标准,涉及原料、产品和检测方法,提出了各项参数的具体指标,并给出了相应的检测方法,对负极材料的实际生产和应用起到了指导性作用。本文介绍了这些标准的主要内容和要点,包括晶体结构、粒度分布、密度、比表面积、pH值、水含量、主元素含量、杂质元素含量、首次放电比容量和首次充放电效率。此外,本文还对今后的标准制定工作提出了部分建议

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^