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Boosting rate and cycling performance of K-doped Na_(3)V_(2)(PO_(4))_(2)F_(3) cathode for high-energy-density sodium-ion batteries

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Green Energy & Environment 2022年第6期7卷 1253-1262页

作者： Jiexin Zhang YangYang Lai Peng Li Yanxia Wang faping zhong Xiangming Feng Weihua Chen Jianjun Liu Xinping Ai Hanxi Yang Yuliang Cao Engineering Research Center of Organosilicon Compounds&Materials of Ministry of Education College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China National Engineering Research Center of Advanced Energy Storage Materials Hunan410205China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou450001China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences1295 Dingxi RoadShanghai200050China

As a promising cathode material,Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF)has attracted wide attention for sodium-ion batteries(SIBs)because of its high operating voltage and high structural ***,the low intrinsic electronic conductivity and insufficient Na ion mobility of NVPF limit its ***,K-doping NVPF is prepared through a facile ball-milling combined calcination *** effects of K-doping on the crystal structure,kinetic properties and electrochemical performance are *** results demonstrate that the Na_(2.90)K_(0.10)V_(2)(PO_(4))_(3)F_(3)(K0.10-NVPF)exhibits a high capacity(120.8 mAh g^(-1) at 0.1 C),high rate capability(66 mAh g^(-1) at 30 C)and excellent cycling performance(a capacity retention of 97.5%at 1 C over 500 cycles).Also,the occupation site of K ions in the lattice,electronic band structure and Na-ion transport kinetic property in K-doped NVPF are investigated by density functional theory(DFT)calculations,which reveals that the K-doped NVPF exhibits improved electronic and ionic conductivities,and located K^(+) ions in the lattice to contribute to high reversible capacity,rate capability and cycling ***,the K-doped NVPF serves as a promising cathode material for high-energy and high-power SIBs.

关键词： Potassium doping Na_(3)V_(2)(PO_(4))_(2)F_(3) Cathode materials Sodium ion batteries Long-term stability

A polyethylene microsphere-coated separator with rapid thermal shutdown function for lithium-ion batteries

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Journal of Energy Chemistry 2020年第5期29卷 33-40页

作者： Chongrong Zhang Hui Li Shixuan Wang Yuliang Cao Hanxi Yang Xinping Ai faping zhong Hubei Key Lab of Electrochemical Power Sources College of Chemistry&Molecular ScienceWuhan UniversityWuhan 430072HubeiChina National Engineering Research Center of Advanced Energy Storage Materials Changsha 410205HunanChina

Thermal runaway is the main factor contributing to the unsafe behaviors of lithium-ion batteries(LIBs)in practical *** application of separators for the thermal shutdown has been proven as an effective approach to protecting LIBs from thermal *** this work,we developed a thermal shutdown separator by coating a thin layer of low-density polyethylene microspheres(PM)onto a commercial porous polypropylene(PP)membrane and investigated the thermal response behaviors of the as-prepared PM/PP separator in *** structural and thermal analysis results revealed that the coated PM layer had a porous structure,which facilitated the occurrence of normal charge-discharge reactions at ambient temperature,although it could melt completely and fuse together within very short time periods:3 s at 110℃and 1 s at 120℃,to block off the pores of the PP substrate,thereby cutting off the ion transportation between the electrodes and interrupting the battery ***,the PM/PP separator exhibits very similar electrochemical performance to that of a conventional separator at ambient ***,it performs a rapid thermal shutdown at an elevated temperature of^110℃,thus controlling the temperature rise and maintaining the cell in a safe *** to its synthetic simplicity and low cost,this separator shows promise for possible application in building safe LIBs.

关键词： Thermal shutdown Separator Safety Lithium-ion battery

Improved Initial Charging Capacity of Na-poor Na0.44MnO2 via Chemical Presodiation Strategy for Low-cost Sodium-ion Batteries

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Chemical Research in Chinese Universities 2021年第2期37卷 274-279页

作者： ZHOU Xi LAI Yangyang WU Xiangjiang CHEN zhongxue zhong faping Al Xinping YANG Hanxi CAO Yuliang Engineering Research Center of Organosilicon Compounds and Materials of Ministry of Education College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072P.R.China Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan430072P.R.China National Engineering Research Center of Advanced Energy Storage Materials Hunan410205P.R.China

Sodium-ion batteries(SIBs)are promising for grid-scale energy storage applications due to the natural abundance and low cost of *** various Na insertion cathode materials,Na0.44MnO2 has attracted the most attention because of its cost effectiveness and structural ***,the low initial charge capacity for Na-poor Na0.44MnO2 hinders its practical ***,we developed a facile chemical presodiated method using sodiated biphenly to transform Na-poor Na0.44MnO2 into Na-rich *** presodiation,the initial charge capacity of Na0.44MnO2 is greatly enhanced from 56.5 mA·h/g to 115.7 mA·h/g at 0.1 C(1 C=121 mA/g)and the excellent cycling stability(the capacity retention of 94.1%over 200 cycles at 2 C)is *** presodiation strategy would open a new avenue for promoting the practical applications of Na-poor cathode materials in sodium-ion batteries.

关键词： Sodium-ion battery Na0.44MnO2 Chemical presodiation Sodium biphenyl Initial charge capacity

Amorphous NaVOPO_(4)as a High-Rate and Ultrastable Cathode Material for Sodium-Ion Batteries

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CCS Chemistry 2021年第10期3卷 2428-2436页

作者： Yongjin Fang Jiexin Zhang faping zhong Xiangming Feng Weihua Chen Xinping Ai Hanxi Yang Yuliang Cao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072 2National Engineering Research Center of Advanced Energy Storage Materials Changsha 410205 3College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001

The low cost and profusion of sodium resources make sodium-ion batteries(SIBs)a potential alternative to lithium-ion batteries for grid-scale energy storage ***,the use of conventional cathode materials for Na-ion intercalation/deintercalation cannot satisfy the requirements of high-powered and long lifespan performance due to multiphase transition and lattice confinement.

关键词： amorphous NaVOPO_(4) cathod e materials polyanion single-phase-like mechanism sodium-ion batteries

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混合动力汽车氢镍电池组模块电压检测方法

电源技术 2021年第3期45卷 343-345,418页

作者：蒋中明钟发平王崧浩吴纯华科力远混合动力技术有限公司广东佛山528000

针对现有动力电池组单体电池电压采样电路的成本高、电路复杂及采样精度低等问题,提出一种采用光继电器与飞渡电容相结合的模块电池采样电路,该电路具有电气隔离性好、电路简单、一致性好等特点,可靠性和精度都能满足设计需要,并在实验... 详细信息

针对现有动力电池组单体电池电压采样电路的成本高、电路复杂及采样精度低等问题,提出一种采用光继电器与飞渡电容相结合的模块电池采样电路,该电路具有电气隔离性好、电路简单、一致性好等特点,可靠性和精度都能满足设计需要,并在实验室环境下进行了静态精度测试。结果表明,所有通道正偏差≤40 mV,负偏差≤24 mV,远远优于设计指标±64 mV,目前已在公司混合动力电池产品中实际应用,具有参考意义和实用价值。

关键词：混合动力汽车氢镍电池模块电压采样飞渡电容

揭示钠离子电池正极材料Na_(6-2x)Fe_(x)(SO_(4))_(3)(1.5≤x≤2.0)的结构及电化学性质

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Science Bulletin 2023年第17期68卷 1894-1903页

作者：赵阿龙汲方杰刘长禹张世豪陈柯安冯祥明陈卫华钟发平艾新平杨汉西方永进曹余良 College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China National Engineering Research Centre of Advanced Energy Storage Materials Changsha 410205China

铁基硫酸盐聚阴离子材料因其成本低廉、电化学性能优异等优点,是钠离子电池大规模应用最有前景的候选材料之一.尽管Na_(2)Fe_(2)(SO_(4))_(3),Na_(2)Fe_(1.5)(SO_(4))_(3),Na_(2.4)Fe_(1.8)(SO_(4))_(3)和Na_(2.4)Fe_(1.8)(SO_(4))_(3)等Na_(6-2x)Fe_(x)(SO_(4))_(3)(NFSO-x 1.5≤x≤2.0)材料在储钠方面取得了巨大成果,但这些NFSO-x的相和结构特性仍存在争议,难以实现具有最佳电化学性能的纯相材料.本文通过实验方法和密度泛函理论计算研究了6个具有不同x的NFSO-x样品,以分析其相和结构特性.结果表明在NFSO-x的1.6≤x≤1.7区域存在纯相,部分Na离子倾向于占据Fe位点以形成更稳定的框架.NFSO-1.7在NFSO-x样品中表现出最佳的电化学性能,具有高的放电容量(0.1 C时为104.5 mAh g^(-1),接近其理论容量105 mAh g^(-1))、出色的倍率性能(30 C时为81.5 mAh g^(-1)),并在10,000次循环中具有超长的循环稳定性,容量保持率为72.4%.本研究有助于阐明铁基硫酸盐聚阴离子材料的相和结构特征,以促进其在大规模储能中的应用.

关键词：钠离子电池理论容量电化学性质放电容量倍率性能电化学性能密度泛函理论计算聚阴离子

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乘用车混合动力技术发展现状及趋势分析

汽车实用技术 2020年第13期45卷 266-268页

作者：王崧浩钟发平吴纯华科力远混合动力技术有限公司广东佛山528000

近几年国内汽车行业蓬勃发展,但混合动力技术相比国外起步较晚,为响应国家节能汽车发展政策,做到节能减排,发展汽车混合动力技术显得尤为重要。文章简单阐述了混合动力技术的耦合技术,对国内外较成熟的车型混动技术的进行收集整理,简单... 详细信息

近几年国内汽车行业蓬勃发展,但混合动力技术相比国外起步较晚,为响应国家节能汽车发展政策,做到节能减排,发展汽车混合动力技术显得尤为重要。文章简单阐述了混合动力技术的耦合技术,对国内外较成熟的车型混动技术的进行收集整理,简单分析国内外主流车型与技术方案,总结出国内外混动技术优缺点,并对未来汽车混合动力技术发展趋势进行分析与阐述,对国内混合动力技术发展具有一定的参考价值。

关键词：汽车节能混合动力发展趋势

辨证论治COVID-19患者77例临床疗效观察

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辽宁中医杂志 2021年第10期48卷 136-139,222页

作者：钟发平李斐斐谭弘珍常德市第一中医医院湖南常德415000

目的辨证论治77例COVID-19患者,评估中药治疗各型COVID-19患者的临床疗效。方法收集常德市第二人民医院使用中药治疗的77例确诊患者,并按照国家标准分为普通型组、重型组及危重型组。统计分析患者的住院时间、核酸转阴时间、临床转重率... 详细信息

目的辨证论治77例COVID-19患者,评估中药治疗各型COVID-19患者的临床疗效。方法收集常德市第二人民医院使用中药治疗的77例确诊患者,并按照国家标准分为普通型组、重型组及危重型组。统计分析患者的住院时间、核酸转阴时间、临床转重率、复检核酸阳性率及病死率。结果(1)经中药治疗后,普通型组核酸转阴时间为(11.41±7.08)d,住院时间为(15.41±7.08)d;重型组核酸转阴时间为(12.67±2.08)d,住院时间为(16.67±2.08)d;危重型组核酸转阴时间为(14.75±2.63)d,住院时间为(18.75±2.63)d。(2)普通组1例患者转重型病例,临床转重率为1.3%。出院后14 d复测核酸阳性率为0。(3)中医治疗患者的病死率为0,显著低于国家平均病死率3.89%。结论中药治疗COVID-19,不仅能够明显改善患者的临床症状,而且能够显著提高重型及危重型患者的临床治愈率,值得临床扩大研究并推广应用。

关键词：辨证论治中医药临床疗效 COVID-19

sTREM-1在AECOPD患者治疗及疗效评估中的临床价值研究

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中国医师杂志 2015年第9期17卷 1331-1334页

作者：刘娆钟发平裴文军王天立杨泽刚邹叶强南华大学附属常德市第一人民医院呼吸内科湖南省常德415000

目的探讨可溶性髓样细胞触发受体-1（sTREM-1）在指导慢性阻塞性肺疾病急性加重期（AECOPD）患者治疗及疗效评估中的价值.方法选择49例AECOPD患者,在急性加重期（AECOPD组）及在治疗达恢复期（sCOPD组）后测定其血清sTREM-1、降钙素原... 详细信息

目的探讨可溶性髓样细胞触发受体-1（sTREM-1）在指导慢性阻塞性肺疾病急性加重期（AECOPD）患者治疗及疗效评估中的价值.方法选择49例AECOPD患者,在急性加重期（AECOPD组）及在治疗达恢复期（sCOPD组）后测定其血清sTREM-1、降钙素原（PCT）、C反应蛋白（CRP）,两组作自身对照,以健康者49例作为健康对照组,测定其上述炎性指标,比较不同组之间sTREM-1的差异,分析AECOPD组及sCOPD组各组血清sTREM-1与PCT、CRP的相关性.结果（1）不同组间sTREM-1 、PCT、CRP水平差异有统计学意义（P＜0.05）.（2） AECOPD组及sCOPD组血清sTREM-1水平与PCT均呈正相关（P＜0.05）,与CRP均无明显相关（P＞0.05）.结论血清sTREM-1水平对指导AECOPD患者的治疗及疗效评估具有重要的临床参考价值.

关键词：膜糖蛋白类/代谢受体,免疫/代谢肺疾病,慢性阻塞性/代谢