聚变堆固态包层框架下,针对初步设计的聚变堆氦冷固态包层进行了中子学分析。选择增殖区的氚增殖剂和中子倍增剂分层分布方案,建立了20°对称D型轮胎环全堆计算模型,对聚变中子源分布离散化处理。借助M on te-C arlo粒子输运程序M ...聚变堆固态包层框架下,针对初步设计的聚变堆氦冷固态包层进行了中子学分析。选择增殖区的氚增殖剂和中子倍增剂分层分布方案,建立了20°对称D型轮胎环全堆计算模型,对聚变中子源分布离散化处理。借助M on te-C arlo粒子输运程序M CNP对聚变堆包层的氚增殖性能和核热功率进行了计算。结果表明,堆总体氚增殖率达到1.247,核热密度峰值在赤道包层模块,能够实现聚变堆运行的氚自持条件。展开更多
Solid-state phase transitions of 4-methylanilinium perchlorate （4-CH3C6H4NH3.C104, 1） and tetrafluoroborate （4-CH3C6H4- NH3-BF4, 2） were investigated with variable-temperature X-ray single-crystal structure analys...Solid-state phase transitions of 4-methylanilinium perchlorate （4-CH3C6H4NH3.C104, 1） and tetrafluoroborate （4-CH3C6H4- NH3-BF4, 2） were investigated with variable-temperature X-ray single-crystal structure analysis and thermal studies. Both 1 and 2 undergo first-order phase transitions and exhibit distinct dielectric anomalies at 385 and 247 K, respectively.展开更多
Rational composite design is highly important for the development of high-performance composite polymer electrolytes(CPEs)for solid-state lithium(Li)metal batteries.In this work,Li closo-borohydride,Li_(2)B_(12)H_(12)...Rational composite design is highly important for the development of high-performance composite polymer electrolytes(CPEs)for solid-state lithium(Li)metal batteries.In this work,Li closo-borohydride,Li_(2)B_(12)H_(12),is introduced to poly(vinylidene fluoride)-Li-bis-(trifluoromethanesulfonyl)imide(PVDF-LiTFSI)with a bound N-methyl pyrrolidone plasticizer to form a novel CPE.This CPE shows superb Li^(+)conduction properties,as evidenced by its conductivity of 1.43×10^(-4) S cm^(-1) and Li^(+)transference number of 0.34 at 25℃.Density functional theory calculations reveal that Li_(2)B_(12)H_(12),which features electron-deficient multicenter bonds,can facilitate the dissociation of LiTFSI and enhance the immobilization of TFSI to improve the Li^(+)conduction properties of the CPE.Moreover,the fabricated CPE exhibits excellent electrochemical,thermal,and mechanical stability.The addition of Li_(2)B_(12)H_(12) can help form a protective layer at the anode/electrolyte interface,thereby preventing unwanted reactions.The above benefits of the fabricated CPE contribute to the high compatibility of the electrode.Symmetric Li cells can be stably cycled at 0.2mA cm^(-2) for over 1200 h,and Li||LiFePO_(4) cells can deliver a reversible specific capacity of 140mAh g^(-1) after 200 cycles at 1C at 25℃ with a capacity retention of 98%.展开更多
文摘聚变堆固态包层框架下,针对初步设计的聚变堆氦冷固态包层进行了中子学分析。选择增殖区的氚增殖剂和中子倍增剂分层分布方案,建立了20°对称D型轮胎环全堆计算模型,对聚变中子源分布离散化处理。借助M on te-C arlo粒子输运程序M CNP对聚变堆包层的氚增殖性能和核热功率进行了计算。结果表明,堆总体氚增殖率达到1.247,核热密度峰值在赤道包层模块,能够实现聚变堆运行的氚自持条件。
基金supported by the National Natural Science Foundation of China (21071030)Natural Science Foundation of Jiangsu Province(BK2010425)
文摘Solid-state phase transitions of 4-methylanilinium perchlorate （4-CH3C6H4NH3.C104, 1） and tetrafluoroborate （4-CH3C6H4- NH3-BF4, 2） were investigated with variable-temperature X-ray single-crystal structure analysis and thermal studies. Both 1 and 2 undergo first-order phase transitions and exhibit distinct dielectric anomalies at 385 and 247 K, respectively.
基金supported by the National Natural Science Foundation of China(51971146 and 51971147)the Major Program for the Scientific Research Innovation Plan of Shanghai Education Commission(2019-01-07-00-07-E00015)+3 种基金Shanghai Outstanding Academic Leaders PlanGuangxi Key Laboratory of Information Materials(Guilin University of Electronic Technology,201017-K)Shanghai Rising-Star Program(20QA1407100)the General Program of Natural Science Foundation of Shanghai(20ZR1438400).
文摘Rational composite design is highly important for the development of high-performance composite polymer electrolytes(CPEs)for solid-state lithium(Li)metal batteries.In this work,Li closo-borohydride,Li_(2)B_(12)H_(12),is introduced to poly(vinylidene fluoride)-Li-bis-(trifluoromethanesulfonyl)imide(PVDF-LiTFSI)with a bound N-methyl pyrrolidone plasticizer to form a novel CPE.This CPE shows superb Li^(+)conduction properties,as evidenced by its conductivity of 1.43×10^(-4) S cm^(-1) and Li^(+)transference number of 0.34 at 25℃.Density functional theory calculations reveal that Li_(2)B_(12)H_(12),which features electron-deficient multicenter bonds,can facilitate the dissociation of LiTFSI and enhance the immobilization of TFSI to improve the Li^(+)conduction properties of the CPE.Moreover,the fabricated CPE exhibits excellent electrochemical,thermal,and mechanical stability.The addition of Li_(2)B_(12)H_(12) can help form a protective layer at the anode/electrolyte interface,thereby preventing unwanted reactions.The above benefits of the fabricated CPE contribute to the high compatibility of the electrode.Symmetric Li cells can be stably cycled at 0.2mA cm^(-2) for over 1200 h,and Li||LiFePO_(4) cells can deliver a reversible specific capacity of 140mAh g^(-1) after 200 cycles at 1C at 25℃ with a capacity retention of 98%.
