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Suppressed Internal Intrinsic Stress Engineering in High-Performance ni-rich cathode Via Multi layered In Situ Coating Structure

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Energy & Environmental materials 2024年第2期7卷 58-66页

作者： Jiachao Yang Yunjiao Li Xiaoming Xi Junchao Zheng Jian Yu Zhenjiang He School of Metallurgy and Environment Central South UniversityChangsha 410083China Engineering Research Center of the Ministry of Education for Advanced Battery materials Central South UniversityChangsha 410083China Changsha Research Institute of Mining and Metallurgy Changsha 410083China ningbo Ronbay New Energy Technol Co Ltd Tanjialing East Rd 39Ningbo 315400China

Lini_(x)Co_(y)Al_(z)O_(2)(NCA)cathode materials are drawing widespread attention,but the huge gap between the ideal and present cyclic stability still hinders their further commercial application,especially for the ni-rich Lini_(x)Co_(y)Al_(z)O_(2)(x>0.8,x+y+z=1)cathode material,which is owing to the structural degradation and particles'intrinsic *** tackle the problems,Li_(0.5)La_(2)Al_(0.5)O_(4)in situ coated and Mn compensating doped multilayer Lini_(0.82)Co_(0.14)Al_(0.04)O_(2)was *** refinement indicates that La-Mn co-modifying could realize appropriate Li/ni disorder *** results and in situ XRD patterns reveal that the LLAO coating layer could effectively restrain crack in secondary particles benefited from the suppressed internal *** further improves as NCA-LM2 has superior mechanical *** SEM,TEM,XPS tests indicate that the cycled cathode with LLAO-Mn modification displays a more complete morphology and less side reaction with *** was used to further investigate cathode-electrolyte interface which was reflected by gas ***-LM2 releases less CO_(2)than NCA-P indexing on a more stable *** modified material presents outstanding capacity retention of 96.2%after 100 cycles in the voltage range of 3.0-4.4 V at 1C,13%higher than that of the pristine and 80.8%at 1 C after 300 *** excellent electrochemical performance could be attributed to the fact that the high chemically stable coating layer of Li_(0.5)La_(2)Al_(0.5)O_(4)(LLAO)could enhance the interface and the Mn doping layer could suppress the influence of the lattice mismatch and *** believe that it can be a useful strategy for the modification of ni-rich cathode material and other advanced functional material.

关键词： compensating doped in situ coating multilayer material ni-rich cathode materials suppressed internal strain

Plasma assisted synthesis of Lini_(0.6)Co_(0.2)Mn_(0.2)O_(2) cathode materials with good cyclic stability at subzero temperatures

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Journal of Energy Chemistry 2021年第5期30卷 46-55页

作者： Fanbo Meng Renzong Hu Zhiwei Chen Liang Tan Xuexia Lan Bin Yuan School of materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage Mater.South China University of TechnologyGuangzhou 510640GuangdongChina

Layered ni-rich cathode materials,Lini_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622),are synthesized via solid reaction assisted with a plasma milling pretreatment,which is resulted in lowering sintering temperatures for solid *** plasma milling pretreated NCM622 cathode material sintered at 780℃(named as PM-780)demonstrates good cycling stability at both room and subzero ***,the PM-780 cathode delivers an initial discharge capacity of 171.2 mAh g^(-1) and a high capacity retention of 99.7%after 300 cycles with current rate of 90 mA g^(-1) at 30℃,while stable capacities of 120.3 and 94.0 m Ah g^(-1) can be remained at-10℃and-20℃in propylene carbonate contained electrolyte,***-situ XRD together with XPS and SEM reveal that the NCM622 cycled at-10℃presented better structural stability and more intact interface than that of cathodes cycled at 30℃.It is also found that subzero temperatures only limit the discharge potential of NCM622 without destroying its structure during cycling since it still exhibits high discharge capacity at 30℃after cycled at subzero *** work may expand the knowledge about the low-temperature characteristics of layered cathode materials for Li-ion batteries and lay the foundation for its further applications.

关键词： ni-rich cathode materials Solid reaction Plasma milling Subzero temperature In-situ X-ray diffraction

A low-carbon strategy for revival of degraded single crystal Lini_(0.6)Co_(0.2)Mn_(0.2)O_(2)

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Rare Metals 2023年第2期42卷 459-470页

作者： Kai Yuan Rui-Qi ning Li-Jiao Zhou Chao Shen Si-Si Zhou Jing Li Ting Jin Xiang-Gong Zhang Ke-Yu Xie State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry CorporationWuhan430064China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Northwestern Polytechnical UniversityShenzhen518057China State Key Laboratory of Environment-Friendly Energy materials School of Material Science and EngineeringSouthwest University of Science and TechnologyMianyang621010China

Single crystal Lini_(0.6)Co_(0.2)Mn_(0.2)O_(2)is currently widely used due to the outstanding cycle stability and ***,its sensitivity to the environment and the high residual alkali makes the electrochemical performance and processing property severely degraded after long-term storage,especially for the ni-rich single crystal ***,it is highly urgent to develop a cost-effective strategy for the revival of degraded ni-rich cathode ***,a low-carbon strategy is proposed to revive the degraded single crystal Lini_(0.6)Co_(0.2)Mn_(0.2)O_(2)(SCNCM622)through water *** solid-liquid reaction mechanism of SCNCM622 and water was revealed and the strong dependence of the recovery effect on the washing time was *** optimized conditions,the sample with a washing time of 24 h shows 31.2%reduction in viscosity,18.4%improvement in discharge capacity,15.3%enhancement in cycle life,and excellent rate performance compared to the blank ***,this strategy can achieve higher utilization of single crystal ni-based cathode materials with a lower cost.

关键词： Li-ion battery ni-rich cathode materials Single crystal Lini_(0.6)Co_(0.2)Mn_(0.2)O_(2) Water washing Electrochemical performance

Mechanical densification synthesis of single-crystalline ni-rich cathode for high-energy lithium-ion batteries

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Journal of Energy Chemistry 2023年第4期79卷 562-568页

作者： Gwonsik Nam Jaeseong Hwang Donghun Kang Sieon Oh Sujong Chae Moonsu Yoon Minseong Ko Division of Convergence materials Engineering Pukyong National UniversityBusan 48547Republic of Korea Namyang R&D Center Hyundai Motor CompanyHwaseong 18280Republic of Korea Division of Industrial Chemistry and Polymer Engineering Pukyong National UniversityBusan 48547Republic of Korea Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

The intergranular microcracking in polycrystalline ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance ***,we have suggested a simple but advanced solid-state method that ensures both uniform transition metal distribution and single-crystalline morphology for ni-rich cathode synthesis without sophisticated ***-assisted mechanical densification(PAMD)process on solid-state precursor mixture enables the dynamic mass transfer through the increased solid-solid contact area which facilitates the grain growth during sintering process,readily forming micro-sized single-crystalline ***,the improved chemical reactivity by a combination of capillary effect and vacancyassisted diffusion provides homogeneous element distribution within each primary *** a result,single-crystalline ni-rich cathode with PAMD process has eliminated a potential evolution of intergranular cracking,thus achieving superior energy retention capability of 85%over 150 cycles compared to polycrystalline ni-rich particle even after high-pressure calendering process(corresponding to electrode density of~3.6 g cm^(-3))and high cut-off voltage *** work provides a concrete perspective on developing facile synthetic route of micron-sized single-crystalline ni-rich cathode materials for high energy density lithium-ion batteries(LIBs).

关键词： Lithium-ion batteries ni-rich cathode materials Mechanical densification Solid-state synthesis