The development situation of the polyolefin industry during the first four years of the Elevemth Five-year-plan was reviewed.Domestic supply and demand of polyolefins at the period of the Twelfth Five-year-plan were a...The development situation of the polyolefin industry during the first four years of the Elevemth Five-year-plan was reviewed.Domestic supply and demand of polyolefins at the period of the Twelfth Five-year-plan were analyzed and predicted.It was pointed out that production capacity of polyolefin in China will be increased significantly and market demand will keep a steady growth.Large-scale industrial equipment of polyolefin will be developed to meet the increasing demand.展开更多
目前商用聚烯烃隔膜存在电解液亲和性和热稳定性差等问题,导致所组装电池的充放电性能和安全性有所欠缺。为改善电解液的亲和性及热稳定性,采用聚乙烯醇为黏结剂将纳米碳酸钙涂覆至聚丙烯隔膜表面,通过扫描电子显微镜、电化学测试、热...目前商用聚烯烃隔膜存在电解液亲和性和热稳定性差等问题,导致所组装电池的充放电性能和安全性有所欠缺。为改善电解液的亲和性及热稳定性,采用聚乙烯醇为黏结剂将纳米碳酸钙涂覆至聚丙烯隔膜表面,通过扫描电子显微镜、电化学测试、热稳定性分析等方法对改性后的隔膜进行了研究。结果表明,纳米碳酸钙质量分数为1.5%的改性隔膜孔隙率可达到46.47%±0.42%,电解液吸液率提升到168.03%±3.46%,改性后隔膜的电解液亲和性得到了改善。170℃时热收缩率为18.59%±4.12%,拉伸强度提升至169 MPa左右,隔膜的热稳定性与力学性能得到提升。改性后隔膜的离子电导率从0.50 m S/cm提升到了0.78 mS/cm,500次充放电循环后磷酸铁锂正极的放电比容量保持率为84.10%,并且在充放电循环过程中更加稳定。展开更多
文摘The development situation of the polyolefin industry during the first four years of the Elevemth Five-year-plan was reviewed.Domestic supply and demand of polyolefins at the period of the Twelfth Five-year-plan were analyzed and predicted.It was pointed out that production capacity of polyolefin in China will be increased significantly and market demand will keep a steady growth.Large-scale industrial equipment of polyolefin will be developed to meet the increasing demand.
文摘目前商用聚烯烃隔膜存在电解液亲和性和热稳定性差等问题,导致所组装电池的充放电性能和安全性有所欠缺。为改善电解液的亲和性及热稳定性,采用聚乙烯醇为黏结剂将纳米碳酸钙涂覆至聚丙烯隔膜表面,通过扫描电子显微镜、电化学测试、热稳定性分析等方法对改性后的隔膜进行了研究。结果表明,纳米碳酸钙质量分数为1.5%的改性隔膜孔隙率可达到46.47%±0.42%,电解液吸液率提升到168.03%±3.46%,改性后隔膜的电解液亲和性得到了改善。170℃时热收缩率为18.59%±4.12%,拉伸强度提升至169 MPa左右,隔膜的热稳定性与力学性能得到提升。改性后隔膜的离子电导率从0.50 m S/cm提升到了0.78 mS/cm,500次充放电循环后磷酸铁锂正极的放电比容量保持率为84.10%,并且在充放电循环过程中更加稳定。
