锂电池固体电解质的物理研究方法

作为一种性能优越的新型可充放电池,锂电池的应用日益广泛.人们更多地把它与化学(特别是电化学)相联系,而对锂离子电池所涉及的物理问题,诸如载流子传导、嵌入物理和相变等的认识还不够深入或是刚刚起步.在这里,着重介绍锂电池固体电解质物理学的研究方法,以期对锂离子电池有更深入的了解.     

电动汽车用锂离子电池散热方法研究

锂离子电池被广泛用于电动汽车来代替传统能源,其性能优劣直接关系到整车的性能,而温度是影响锂离子电池性能的主要因素,如果锂电池长时间处于高温下工作,电池性能会迅速衰减,甚至会引发热失控,因此研究锂离子电池的散热方法尤为重要。首先,从锂离子电池的充电机理和熔化过程分析了温度过高对于锂电池的性能影响;总结了空气冷却、液体冷却、相变材料冷却、热管冷却等4种常见锂电池散热方法的原理、特点和应用;最后,分别从不同方面归纳了4种不同散热方法的特点。     

锂离子电池无机正极材料研究进展

正极材料的能量密度是制约锂离子电池体系的瓶颈,锂电池的综合性能的提升很大程度上取决于正极材料的特性.当前锂离子电池正极材料主要为基于层状结构、尖晶石结构以及聚阴离子结构无机材料.本文概述了无机正极材料的性能特点以及最新研究进展.     

电池隔膜将延续高景气度

锂电池主要材料包括正极材料、负极材料、电解液和隔膜,其中隔膜被公认为最具技术含量的环节.隔膜的成本约占锂离子电池成本的20％,毛利率可以达到50％-60％,是四大材料中盈利能力最高的产品.目前锂离子电池倍广泛运用于3C电子产品,新能源汽车、储能电站等领域.     

中国锂电池的领航人——其鲁

曾经有人说:"世界锂电池的研究开发就像攀登珠穆朗玛峰,日本已站到了8000米的高度,美国站到了7000米,欧渊站到6000米,而中国仅仅站到5000米。果真如此吗?北大其鲁教授深谙锂离子二次电池正极材料研发的战略意义,通过不懈的努力,终于研究开发出具有我国自主知识产权的锂离子二次电池,并使其在锂电池高科技产业领域跻身世界前列。     

基于变阶RC网络的锂离子电池等效电路模型

针对电动汽车锂离子电池阻容(resistance-capacitance,RC)模型存在低阶模型近似程度低和高阶模型结构复杂的问题,提出一种兼具实用性和精确性的可变阶RC网络等效电路模型.在充分理解磷酸铁锂电池特性的基础上,对电池进行了测试实验,利用赤池信息量准则(Akaike information criterio...     

数字摄影

科技纸质锂电池(300微米)电池是各种便携式电子产品重要却又恼人的部件.尤其碰到大而且重的电池,让设备的移动性很差;而较小的电池,又会导致设备性能降低或电池寿命变短.不过,现在斯坦福大学开发的新型锂离子电池或将让这一切变得更加便捷:新型的超薄可充电电池已经可以制作在一张纸上.来自斯坦福大学的一位材料科学家将薄膜碳纳米管涂在另一张表层含有金属的锂化合物纳米管上.这些很薄的双层薄膜放在普通纸张     

“锂”想电池 改变世界

2019年的诺贝尔化学奖颁给了约翰·古迪纳夫、斯坦利·惠廷厄姆和吉野彰,以表彰这三位科学家在锂离子电池领域做出的卓越贡献。“他们创造了一个可充电的世界。”瑞典皇家科学院这样评价道。我们时刻能感受到锂电池对人类的重要意义——如今的电子产品都离不开锂电池:智能手机、笔记本电脑、扫地机器人、充电宝……它们都需要锂电池;锂电池已经成为小型电子设备、电动汽车和固定式储能系统的普遍电源。     

锂离子二次电池负极材料及电解质研究

综述了锂离子二次电池负极材料和电介质的研究现状 ,对现行研究和应用的二次锂电池负极材料、电解质中存在的问题进行了深入分析并对材料的分类、特点和发展方向进行了研究     

会“呼吸”的电池

IBM公司的研发人员发明了一种锂电池。在汽车行驶途中,这种电池会“吸”入空气中的氧气,氧气与锂离子产生化学反应,导致电池持续放电;待汽车停靠充电的时候,电池将氧气“呼出”释放到空气中。这整个过程宛如“呼吸”一般。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.