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废旧镍钴锰酸锂正极材料的固相直接修复再生技术

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电源技术 2024年第4期48卷 568-583页

作者：朱俊峰田俊行吴科奇王峰姜煜煜孙学义庄卫东北京科技大学绿色低碳钢铁冶金全国重点实验室北京100083 北京科技大学冶金与生态工程学院北京100083 北京科技大学稀贵金属绿色回收与提取北京市重点实验室北京100083 上海空间电源研究所空间电源技术国家重点实验室上海200245

近年来,随着新能源汽车领域的快速发展,锂离子动力电池的出货量不断增加,三元锂离子电池因其优异的高能量密度性能已被广泛应用于便携式电子设备和新能源汽车等领域。随着锂离子电池即将迎来“退役”高峰,镍钴锰酸锂正极材料作为锂离子... 详细信息

近年来,随着新能源汽车领域的快速发展,锂离子动力电池的出货量不断增加,三元锂离子电池因其优异的高能量密度性能已被广泛应用于便携式电子设备和新能源汽车等领域。随着锂离子电池即将迎来“退役”高峰,镍钴锰酸锂正极材料作为锂离子电池中最为关键的电极材料之一,其高效绿色循环利用具有重要的资源、环境、经济及战略意义。目前传统的镍钴锰酸锂正极材料回收技术以火法冶金和湿法冶金为主,这些方法可以从废弃的正极材料中提取高附加值金属,但普遍存在污染大、能耗高、循环周期长等问题。固相直接修复再生技术能够直接对废旧正极材料进行修复,实现正极材料的结构、组分及电化学性能的有效恢复,因其具有工艺简单、绿色高效等优势而受到广泛的关注。围绕固相直接修复再生技术,系统阐述镍钴锰酸锂正极材料的失效机制和修复机理,详细分析焙烧温度、焙烧气氛以及补锂工艺对固相修复再生镍钴锰酸锂正极材料结构和性能的影响及其作用机理,并指出了目前固相直接修复再生技术存在的问题,展望了该技术的未来前景。

关键词：锂离子电池镍钴锰酸锂正极材料直接修复再生固相法

Effect of fluxes on synthesis and luminescence properties of BaSi_2O_2N_2:Eu^(2+) oxynitride phosphors

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Journal of Rare Earths 2018年第3期36卷 225-230页

作者： Jiansheng Huang Ronghui Liu Yuanhong Liu Yunshen Hu Guantong Chen Chunpei Yan junhang tian Bin Hu National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.

Eu^2＋ activated BaSi2 O2 N2 oxynitride bluish-green phosphor was synthesized adopting conventional high-temperature solid-state reaction method, in which BaF2, Na2 CO3 and NH4 Cl were used as the *** phase formation, size distribution and microscopic morphology were characterized to investigate the influence of adding fluxes on photo luminescence properties. The results indicate that with the addition of BaF2 flux, the particle morphology becomes regular and size distribution narrows and the phase purity of BaSi2 O2 N2：Eu^2＋ phosphor can be improved effectively. The photoluminescence intensity of BaSi2 O2 N2：Eu^2＋ phosphor with BaF2 as flux gets enhanced obviously, which is much higher than that of Na2 CO3, NH4 Cl and without flux. The optimum content of BaF2 flux is 4 wt%, and the maximum photoluminescence intensity of the BaSi2 O2 N2：Eu^2＋ phosphor prepared with BaF2 flux rises to 141%,meanwhile, the phosphors with BaF2 flux exhibits low thermal quenching. The results indicate that the BaSi2 O2 N2：Eu^2＋ is sort of promising bluish-green phosphor for application in full-spectra LED.

关键词： BaSi2O2N2 Oxynitride phosphor Flux Thermal stability Rare earths

Broadband near-infrared luminescence and energy transfer of Cr^(3+),Ce^(3+) co-doped Ca_(2)LuHf_(2)Al_(3)O_(12) phosphors

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Journal of Rare Earths 2021年第3期39卷 269-276,I0002页

作者： Jinpin Wu Weidong Zhuang Ronghui Liu Yuanhong Liu Tongyu Gao Chunpei Yan Min Cao junhang tian Xiaoxia Chen National Engineering Research Center for Rare Earth Materials GRINM Croup Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of ChemistryBiology and Materials ScienceEast China University of TechnologyNanchang 330046China

Broadband near-infrared phosphors are highly desirable for food *** Ca_(2)LuHf_(2)Al_(3)O_(12):Cr^(3+)(CLHA:Cr^(3+)) and Ca_(2)LuHf_(2)Al_(3)O_(12):Ce^(3+),Cr^(3+)(CLHA:Ce^(3+),Cr^(^(3+))) phosphors were synthesized by the conventional high-temperature solid state *** CLHA:Cr^(3+)phosphor,with a good thermal stability,shows a red shift owing to radiation reabsorption and non-radiative transition with increasing Cr^(3+)*** co-doped sample,the emission intensity of Cr^(3+)can be enhanced by three times due to the energy transfer from Ce^(3+)to Cr^(3+),which can be evidenced by a significant overlap between the PLE of Cr^(3+)single-doped phosphor and the PL of Ce^(3+)single-doped *** addition,the mechanism of energy transfer is identified as a quadrupole-quadrupole interaction according to decay Lifetime and Dexter’s energy transfer *** broadband NIR emission peaked at 775 nm of CLHA:Cr^(3+),Ce^(3+)phosphor shows a bright prospect in nondestructive quality-control analysis systems for food.

关键词： Broadband near-infrared Energy transfer Garnet phosphor Rare earths

Blue-emitting Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) phosphors for high CRI white LEDs

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Journal of Rare Earths 2021年第6期39卷 627-633,I0001页

作者： Yipeng Zhou Yunsheng Hu Ronghui Liu Yuanhong Liu Weidong Zhuang Min Cao Tongyu Gao junhang tian Yanfeng Li Guantong Chen National Engineering Research Center for Rare Earth Materials GRINM Group Co.Ltd.Beijing100088China CRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

A broadband blue-emitting Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+)(x=0-0.2) phospho rs were synthesized,which can be used for near-UV pumped white light-emitting diodes(w-LEDs).The crystal structures,photoluminescence pro perties,external quantum efficiency,the rmal stability and application perfo rmance of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+),by partially substituting Sr^(2+) with Ca^(2+)(x=0-0.2),were studied by various analytical *** the Ca/Sr ratio of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) gradually increases,the emission peak of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) red-shiftes from 459 to 465 nm,corrected external quantum efficiency increases from 31.8% to 42.9%,and the thermal stability is also *** mechanism of the changes of the photoluminescence emission and excitation spectra,external quantum efficiency and thermal stability properties was also investigated in *** addition,a w-LED was fabricated by using SrLu_(2)O_(4):Ce^(3+)(blue),β-sialon:Eu^(2+)(green) and(Sr,Ca)AlSiN_(3):Eu^(2+)(red) phosphors combined with a 405 nm near-UV LED chip,and its color rendering index(CRI) reaches *** Sr_(0.8)Ca_(0.2)Lu_(2)O_(4):Ce^(3+) is applied as blue phosphor to substitute SrLu_(2)O_(4):Ce^(3+),the obtained w-LED devices have high luminous efficiency,and CRI greater than *** re sults show that the Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) can be potential blue phosphors for n-UV pumped high CRI w-LEDs application.

关键词： n-UV pumped w-LED Blue phosphor Red shift Excellent thermal stability High color rendering index Rare earths

Decomposition of the mixed rare earth concentrate by microwave-assisted method

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Journal of Rare Earths 2016年第5期34卷 529-535页

作者：黄宇坤张廷安刘江豆志河田俊行 Key Laboratory of Ecological Metallurgy of Multi-Metal Intergrown Ores of Ministry of Education School of Materials & MetallurgyNortheastern University

A novel process was proposed to strengthen the decomposition of the mixed rare earth concentrate by utilizing the microwave *** information on the mechanisms by which microwave heating improved the leaching behavior of rare earth elements（REEs）,and an interpretation of the interrelationship between mineralogy,decomposition process,and leaching process were provided in this *** influences of the temperature,time of microwave heating and contents of NaO H（mass ratio of NaO H to mixed rare earth concentrate）on the decomposition of mixed rare earth concentrate were *** results revealed that the temperature was the main factor affecting the decomposition *** recovery of REEs by hydrochloric acid leaching reached 93.28% under the microwave heating conditions：140 oC,30 min and 35.35% NaO *** BET specific surface area and SEM analysis indicated that the particles of mixed rare earth concentrate were non-hole,while the particles presented a porous structure after heating the concentrate by microwave *** the microwave treated sample after water leaching,the BET specific surface area was 11.04 m^2/g,which was higher than the corresponding values（6.94 m^2/g）for the mixed rare earth *** result could be attributed to the phase changes of bastnaesite and monazite,and a number of cracks induced by thermal *** increase of BET specific surface area resulted in an increase of the recovery of REEs by promoting interaction within the system of acid leaching.

关键词： mixed rare earth microwave heating leaching behavior specific surface area microstructure

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镍酸锂系正极材料倍率性能的研究进展

中国稀土学报 2023年第3期41卷 497-519,I0003页

作者：王峰赵桓吴红峰田俊行孙学义庄卫东北京科技大学钢铁冶金新技术国家重点实验室北京100083 北京科技大学冶金与生态工程学院北京100083 北京科技大学稀贵金属绿色回收与提取北京市重点实验室北京100083 有研科技集团有限公司稀土材料国家工程研究中心有研稀土新材料股份有限公司北京有色金属研究总院北京100088 中国石油天然气股份有限公司北京100010

为了获得更高的能量密度和更低的成本,高镍化和无钴化成为了镍基正极材料发展的趋势。在各类高镍无钴正极材料中,镍酸锂(LNO)系正极材料因具有较高的能量密度和较低的成本成为了研究的热点,然而其倍率性能较差,难以满足电动汽车、3C数... 详细信息

为了获得更高的能量密度和更低的成本,高镍化和无钴化成为了镍基正极材料发展的趋势。在各类高镍无钴正极材料中,镍酸锂(LNO)系正极材料因具有较高的能量密度和较低的成本成为了研究的热点,然而其倍率性能较差,难以满足电动汽车、3C数码产品及储能领域日趋增长的快充需求。因此,如何提高其倍率性能,成为了亟待解决的关键问题。本文从原子-晶体-颗粒尺度出发,系统阐述了Li^(+)/Ni^(2+)混排、相变、非理想化学计量配比、颗粒形貌和界面副反应等因素对LNO系正极材料倍率性能的影响,并归纳出制约倍率性能的三个关键因素:体相结构稳定性、界面结构稳定性和锂离子扩散能力。为提高LNO系正极材料的倍率性能,基于以上制约因素提出结构优化(掺杂改性、包覆改性、结构设计)、体系优化(正极掺混、优化电解液添加剂)和工艺优化(优化合成工艺、优化循环制度)等改性策略。最后,基于LNO系正极材料的发展现状,指出了LNO系正极材料发展过程中面临的新挑战。

关键词：锂离子电池高镍无钴镍酸锂系正极材料倍率性能

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稀土光功能材料发展现状及趋势

中国稀土学报 2021年第3期39卷 338-349页

作者：刘荣辉刘元红陈观通余金秋高彤宇田俊行王恒有研科技集团有限公司稀土材料国家工程研究中心有研稀土新材料股份有限公司北京100088

稀土光功能材料作为照明、显示和信息探测等领域的支撑材料之一,已在室内照明、液晶显示、核医学成像、辐射探测、激光工业和国防安全等领域得到广泛应用。介绍了中国稀土光功能材料的技术和产业发展现状,指出了绿色照明、高品质显示和... 详细信息

稀土光功能材料作为照明、显示和信息探测等领域的支撑材料之一,已在室内照明、液晶显示、核医学成像、辐射探测、激光工业和国防安全等领域得到广泛应用。介绍了中国稀土光功能材料的技术和产业发展现状,指出了绿色照明、高品质显示和高敏信息探测等应用新趋势,重点分析了超高色域显示和全光谱健康照明荧光粉、稀土激光和闪烁晶体等稀土光功能材料发展新动态,提出了稀土光功能材料未来发展建议。

关键词：稀土光功能材料白光LED 超高色域显示全光谱照明晶体材料

高镍单晶正极材料的锂离子扩散动力学研究进展

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粉末冶金工业 2023年第5期33卷 125-136页

作者：余暑生田俊行郭辉胡锦榛孙学义庄卫东北京科技大学绿色低碳钢铁冶金全国重点实验室北京100083 北京科技大学冶金与生态工程学院北京100083 北京科技大学稀贵金属绿色回收与提取北京市重点实验室北京100083

高镍正极材料具有高的比能量和较长的循环寿命,是推动锂离子电池技术发展的关键材料之一。传统高镍正极材料的晶粒形貌是二次球粒子,其二次球结构在电化学循环中容易开裂,从而引起电化学性能的衰退和电池安全性问题。单晶化策略能够有... 详细信息

高镍正极材料具有高的比能量和较长的循环寿命,是推动锂离子电池技术发展的关键材料之一。传统高镍正极材料的晶粒形貌是二次球粒子,其二次球结构在电化学循环中容易开裂,从而引起电化学性能的衰退和电池安全性问题。单晶化策略能够有效地提升高镍正极材料的长周期循环性能和安全性,缓解高镍正极材料的热稳定性、晶体结构及颗粒结构稳定性等问题。但是缓慢的锂离子扩散动力学导致高镍单晶正极材料倍率性能恶化和材料结构衰退,是高镍单晶正极材料面临的重大挑战。综述比较了单晶正极材料与传统二次球正极材料之间的结构及电化学性能的差异,分析了单晶正极材料稳定性机制,重点阐述了高镍单晶正极材料的缓慢的锂离子扩散动力学对其失效机制的影响,总结了现阶段研究者改善高镍单晶正极材料的锂离子扩散动力学的策略,提出了提升高镍单晶正极材料的锂离子扩散动力学未来的研究重点,为高镍单晶正极材料产业化研究提供理论指导。

关键词：锂离子电池高镍正极材料单晶锂离子扩散动力学倍率性能

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基于物联网的校园快递派送控制系统的研究

现代信息科技 2021年第17期5卷 178-181页

作者：田君航尹鸿铭钟叶飞董浩刘歆吴韬西北民族大学甘肃兰州730000 不详

互联网的快速发展带动了快递行业的空前繁荣,但快递行业仍存在“最后一公里”的资源浪费、效率低下、可靠性不足以及用户体验感差等一系列问题。文章依托物联网技术,构建智能运送机器人派件系统,制造一种具备自动取件和派送功能的机器... 详细信息

互联网的快速发展带动了快递行业的空前繁荣,但快递行业仍存在“最后一公里”的资源浪费、效率低下、可靠性不足以及用户体验感差等一系列问题。文章依托物联网技术,构建智能运送机器人派件系统,制造一种具备自动取件和派送功能的机器人。该机器人可以自动循迹送货,亦可按照客户要求到指定位置取件然后再将物品运送至指定位置。从而最大限度地解放劳动力,提升物流运输效率并满足客户急件运输的需求。

关键词：树莓派智能运送机器人控制系统微信小程序