包覆型锂离子正极材料LiNi0.9Mn0.03Co0.07O2的合成与性能

采用复合包覆法合成了锂离子正极材料LiNi0.9Mn0.03Co0.07O2,前驱体的合成过程条件与最终包覆的材料性能有关。讨论了包覆沉淀反应过程中沉淀剂、pH值、搅拌速度和氨水浓度对电化学性能的影响。同时还考察了煅烧制度对材料电化学性能的影响。结果表明：在优化条件下Co,Mn均匀包覆在β-Ni（OH）2表面上;合成的正极材料LiNi0.9Mn0.03Co0.07O2在电压范围3～4.3V,电流密度30mA·g^-1下,第二次放电容量为194mAh·g^-1,50次循环后容量仍保持为189mAh·g^-1,材料循环性能稳定。     

LiNi0.6Co0.1Mn0.3O2正极材料的合成与性能

采用共沉淀-高温固相法制备LiNi0.6Co0.1Mn0.3O2锂离子正极材料,并使用X 射线衍射仪（XRD）和扫描电镜（SEM）技术分别表征其结构和形貌.然后将所得LiNi0.6Co0.1Mn0.3O2正极材料组装成扣式电池,并表征其电化学性能,探讨烧结温度和锂配量对其电化学性能的影响.结果表明：所得LiNi0.6Co0.1Mn0.3O2正极材料的放电比容量随烧结温度的升高而增大,且在900℃时表现出最佳的电化学性能.室温下,1C倍率下,锂配量(n(Li)/n(Ni+ Co+ Mn)=1.09)时,正极材料的首次放电容量为143.7 mAh/g,50次循环后,正极材料的放电比容量仍有141.3 mAh/g,容量保持率为98.3%.     

碳酸盐共沉淀法合成Li1＋xNi0.6Co0.2Mn0.2O2Fx正极材料及其电化学性能

采用碳酸盐共沉淀法合成Li1＋xNi0.6Co0.2Mn0.2O2Fx正极材料,研究了不同含量的Li、F复合掺杂对LiNi0.6Co0.2Mn0.2O2样品的晶型结构、形貌以及电化学性能的影响.研究结果表明：Li、F复合掺杂未改变LiNi0.6Co0.2Mn0.2O2样品的层状结构;掺杂后的样品颗粒细化;电化学循环性能和电极过程的可逆性明显得到提高.掺杂量x=0.06时,Li1＋xNi0.6Co0.2Mn0.2O2Fx样品的首次充放电容量分别为168,160 mA·h/g,循环50次后容量为153 mA·h/g.     

碳酸盐共沉淀法合成LiNi1/3Co1/3Mn1/3O2及其电化学性能

以碳酸盐共沉淀法合成了Ni1/3Co1/3Mn1/3CO3前驱体,然后以Ni1/3Co1/3Mn1/3CO3和LiOH·H2O为原料,合成出了层状锂离子电池正极材料Li Ni1/3Co1/3Mn1/3O2.通过XRD,SEM和电化学测试对Li Ni1/3Co1/3Mn1/3O2材料的结构、形貌及电化学性能进行了测试和表征.结果表明,800℃烧结12 h所合成的样品粒度大小分布比较均匀,以0.2 C充放电,其首次放电容量为153 mAh·g-1,循环30次后容量为140 mAh·g-1.     

LiNi0.8Co0.2O2的制备与修饰

由LiOH·H2O、NiO、Co2O3高温固相合成LiNi0.8Co0.2O2,并对制得的样品进行表面修饰.对所得产物进行了X光电子能谱、扫描电镜和X射线衍射测试,用合成的材料组装成电池进行充放电容量测试.实验结果表明:应用此工艺制备的LiNi0.8Co0.2O2具有高的充放电比容量,分别为184.8mA·h·g-1和160.7mA·h·g-1.包覆后初次充放电比容量分别为168.7mA·h·g-1和157.6mA·h·g-1.容量有所下降,但循环性能提高,说明表面修饰可以有效地抑制正极材料与电解液之间的恶性相互作用,能改善材料的循环性能.     

钠电正极材料Na2/3Ni1/3Mn2/3O2的合成工艺参数研究

通过高温固相法制备了钠离子电池正极材料Na2/3Ni1/3Mn2/3O2,并对Na2/3Ni1/3Mn2/3O2的合成工艺参数进行了研究.通过对不同条件下制得的正极材料进行物化性质与电化学性能的表征,确定材料的最佳合成温度为900℃,最佳保温时间为12 h.在2～4.5 V电压区间内,0.2 C倍率下,材料首周的放电容量为110 mAh·g-1,100周充放电后的可逆容量为86 mAh·g-1,容量保持率达78.1％.     

Al2O3包覆LiNi0.8Co0.2O2正极材料及其电化学性能

为了减少锂离子电池正极材料与电解液的相互作用,用沉淀法在LiNi0.8Co0.2O2表面包覆一层Al2O3,并通过电化学测试、扫描电镜和X射线衍射研究其表面形貌和晶体结构.结果表明,经过表面包覆后,有效地抑制了电解液对正极材料的侵蚀,虽然初始放电容量略有降低,但循环性能明显改善;Al2O3包覆量对LiNi0.8Co0.2O2电化学性能存在影响,包覆量为0.7%(质量分数)的样品性能最优.     

LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2的制备及其性能研究

采用二次高温煅烧法制备了三元复合正极材料LiNi0.5Co0.2Mn0.3O2,用SEM、XRD和蓝电测试仪等对其结构和物理化学性能进行表征和测定。结果表明,材料具有较好的层状结构,在2.75~4.25V下0.2C放电容量达到151mAh/g,经50次充放电循环后,放电容量仍为初始放电容量的93%,放电容量保持率较高,是一种电化学性能优良的三元正极复合材料。     

正极材料LiCo0.7Al0.3O2包覆MgO的改性研究

采用溶胶-凝胶法合成了掺杂改性的锂离子电池正极材料LiCo0.7Al0.3O2,并对其进行包覆MgO改性.采用X射线衍射和扫描电镜对该材料的晶体结构和表观形貌进行分析,通过恒电流充放电、循环伏安以及电化学阻抗技术分析其电化学性能.试验结果表明,所制备的正极材料LiCo0.7Al0.3O2和MgO-LiCo0.Al0.3O2均为α-NaFeO2型层状结构,形貌近似球形,且颗粒分布均匀.包覆后的材料充放电电压提高,充放电循环性能得到明显改善,其中以包覆量为1.0%时材料性能最好,首次放电容量为120.17 mAh·g-1,30次循环后容量保持率为89.3%.     

从工业废液中回收镍钴合成锂离子电池正极材料LiNixCo1—xO2

探索了从废液中回收钴在空气气氛下合成锂离子电池正极材料LiNixCo1-xO2的方法和工艺,结果表明,合成材料的充放电性能都比较好,LiNi0.3Co0.7O2在600℃6h→750℃16h时制得的产物初始充电容量达到154.938mAh/g,接近用分析纯的镍钴原料合成的正极材料LiNi0.3Co0.7O2的首次充电容量（156.146mAh/g）。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.