Synthesis of sub-micrometer lithium iron phosphate particles using supercritical hydrothermal method for lithium ion batteries

In this study, sub-micrometer LiFePO₄ particles with high purity and crystallinity were synthesized using supercritical hydrothermal method as the cathode material for lithium ion batteries. Experimental results show that templates and calcination time have significant impacts on the purity, particle size and morphology of LiFePO₄ particles. The as-prepared LiFePO₄ particles using polyvinyl pyrrolidone (PVP) template with additional one hour calcination at 700°C exhibit characteristics of good crystallinity, uniform size distribution, high capacity and cycling performance. The specific discharge capacities of 141.2 and 114.0mA·h/g were obtained at the charge/discharge rates of 0.1 and 1.0 C, respectively. It retained 96.0% of an initial capacity after 100 cycles at 1.0 C rate. The good electrochemical performance of the as-synthesized material is attributed to the synergistic factors of its reasonable particle size and surface areas and high crystallinity.     

橡胶沥青碾压工艺初探

文章以沪蓉西高速公路沥青路面施工为例,探讨如何保证橡胶沥青路面压实成型后的压实度和平整度。这对高等级公路橡胶沥青路面的施工具有一定的指导意义。     

邳州公交开展“百日优质服务竞赛”活动

为创新服务理念,拓展服务领域,提升服务质量,充分展示公交行业文明、礼仪、诚信的精神风貌和行业形象,邳州公共交通公司自2008年11月20日-2009年2月20日组织开展“百日优质服务竞赛”活动。     

公路路堑边坡加筋土挡墙处治的稳定性分析

以广东省某高速公路路堑边坡滑坡加筋土挡墙处治方案为研究对象,详细地分析了加筋土处治公路路堑滑坡的优缺点;分别运用极限平衡理论与有限元强度折减法计算路堑边坡加筋前后稳定性安全系数;将极限平衡理论与有限元强度折减法计算结果相结合,对该滑坡加筋土边坡处治技术进行稳定性分析评估。