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A comparative study on the reactivity of charged Ni-rich and Ni-poor positive electrodes with electrolyte at elevated temperatures using accelerating rate calorimetry

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Journal of Energy Chemistry 2021年第9期30卷 523-530页

作者： Dongxu Ouyang Yulong Liu Ines Hamam Jian Wang Jeff Dahn State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Department of Physics and Atmospheric Science Dalhousie UniversityHalifax B3H4R2Canada Department of Process Engineering and Applied Science Dalhousie UniversityHalifax B3H3J5Canada

The reactivity between charged Li(Li_(0.115)Mn_(0.529)Ni_(0.339)Al_(0.017))O_(2)(Li-rich),single crystal Li(Ni_(0.8)Mn_(0.1)Co_(0.1))O_(2)(SC-NMC811),LiFePO_(4)(LFP) and LiMn_(0.8)Fe_(0.2)PO_(4)(LMFP) positive electrodes at different states of charge(SOCs) and traditional carbonate-based electrolyte at elevated temperatures is systematically studied using accelerating rate calorimetry(ARC).The results show that the SOC greatly affects the thermal stability of the Li-rich and SC-NMC811 when traditional carbonate-based electrolyte is *** an increase in the SOC increases the energy density of lithium-ion cells,it also increases the reactivity between charged Li-rich and SC-NMC811 samples with electrolyte at elevated *** comparison with SC-NMC811,the Li-rich samples are much more stable at elevated temperatures,and the latter have higher specific ***-NMC811 samples are less reactive than traditional polycrystalline *** LFP and LMFP samples show excellent thermal stability at elevated *** substitution of Fe by Mn in the olivine series positive materials does not impact the reactivity with electrolyte.

关键词： Lithium-ion cells accelerating rate calorimetry Positive electrodes Safety

Scalable synthesis of Na_(3)V_(2)(PO_(4))_(3)/C with high safety and ultrahigh-rate performance for sodium-ion batteries

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Chinese Journal of Chemical Engineering 2022年第6期35卷 280-286页

作者： Guijia Cui Hong Wang Fengping Yu Haiying Che Xiaozhen Liao Linsen Li Weimin Yang Zifeng Ma Department of Chemical Engineering Shanghai Electrochemical Energy Devices Research CenterShanghai Jiao Tong UniversityShanghai 200240China SINOPEC Shanghai Research Institute of Petrochemical Technology Shanghai 201208China Zhejiang NaTRIUM Energy Co.Ltd. Shaoxing 312000China

NASICON-type Na_(3)V_(2)(PO_(4))_(3) is a promising electrode material for developing advanced sodium-ion *** Na_(3)V_(2)(PO_(4))_(3) with good performance by a cost-effective and large-scale method is significant for industrial *** this work,a porous Na_(3)V_(2)(PO_(4))_(3)/C cathode material with excellent electrochemical performance is successfully prepared by an agar-gel combined with freeze-drying *** Na_(3)V_(2)(PO_(4))_(3)/C cathode displayed specific capacities of 113.4 mAh·g^(-1),107.0 mAh·g^(-1) and 87.1 mAh·g^(-1) at 0.1 C,1 C and 10 C,*** the first time,the 500-mAh soft-packed symmetrical sodium-ion batteries based on Na_(3)V_(2)(PO_(4))_(3)/C electrodes are successfully *** 500-mAh symmetrical batteries exhibit outstanding low temperature performance with a capacity retention of 83%at 0℃ owing to the rapid sodium ion migration ability and structural stability of Na_(3)V_(2)(PO_(4))_(3)/***,the thermal runaway features are revealed by accelerating rate calorimetry(ARC)test for the first *** stability and safety of the symmetrical batteries are demonstrated to be better than lithium-ion batteries and some reported sodium-ion *** work makes it clear that the soft-packed symmetrical sodium ion batteries based on Na_(3)V_(2)(PO_(4))_(3)/C have a prospect of practical application in high safety requirement fields.

关键词： Na_(3)V_(2)(PO_(4))_(3)/C Sodium-ion batteries Symmetrical battery accelerating rate calorimetry Battery thermal safety

Interface engineering by gelling sulfolane for durable and safe Li/LiCoO_(2) batteries in wide temperature range

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Science China Materials 2022年第11期65卷 2967-2974页

作者： Xinrun Yu Xianluo Hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Lithium-metal batteries(LMBs)with high energy densities have aroused intensive interest in electrical energy storage devices but suffer from the risk of thermal runaway,especially under harsh conditions of high temperature or thermal *** intrinsically thermally stable electrolytes with higher performance and higher safety beyond commercial liquid electrolytes is a major challenge in this *** we report on a unique,highly durable sulfolanebased gel electrolyte constructed by a facile gelling *** method takes advantages of thermotolerant sulfolane as a plasticizer and strong dipole-dipole interactions to achieve the gelation of polymer polyvinylidene fluoride/polyethylene *** systematically investigated the influence of gelled sulfolane on gel formation,lithium plating/stripping,and solid electrolyte *** from favorable interface engineering,the sulfolane-based gel electrolyte remarkably enhances the cyclic and safety performances of *** used in the Li/LiCoO_(2) battery,the resulting gel electrolyte enables long-term cycling stability at high temperatures up to 90°***,the thermal safety of practical Li/LiCoO_(2) pouch cells(up to 190°C)has also been demonstrated by accelerating rate *** results contribute to the development of high-safety LMBs that require abuse tolerance,high energy,and long calendar life.

关键词： lithium-metal batteries gel electrolytes solid electrolyte interphases thermal safety accelerating rate calorimetry