A combinatorial library of twenty-three,phase pure,near-NMC111(LiNi_(0.33) Mn_(0.33)Co_(0,33)O_(2))composi-tions were synthesised and their electrochemical performance,was mapped(in lithium ion half-cells).Each of the...A combinatorial library of twenty-three,phase pure,near-NMC111(LiNi_(0.33) Mn_(0.33)Co_(0,33)O_(2))composi-tions were synthesised and their electrochemical performance,was mapped(in lithium ion half-cells).Each of the 23 compositions was made in series,using a two-step process of 1)a rapid initial contin-uous hydrothermal precipitation,followed by 2)solid state lithiation.The 23 lithiated NMC samples were then subjected to analytical methods including electron microscopy(selected samples),Powder X-ray Diffraction and electrochemical tests in half cell Li-ion configurations versus Li metal.A sample with a Ni:Mn:Co(NMC)ratio of 39:28:33,revealed a specific capacity of 150 mA h g^(-1) at a C/20 rate,which was 63 and 43% greater capacity than NMC111 and NMC433 samples produced in this work,respectively.The sample with NMC ratio 47:25:28,showed the best capacity retention characteristics,retaining 70%of its C/20 capacity at 1C,after 40 cycles.Further analysis of all the samples by cyclic voltammetry and elec-trochemical impedance spectroscopy,allowed compositional mapping of diffusion coefficients.Overall,the mapping data revealed a gradual change of properties across compositional space,which has vali-dated our combinatorial approach and allowed identification of the optimum performing near-NMC111 cathode materials.展开更多
基金Jawwad A.Darr and Daniel Commandeur would like to thank Innovate UK for funding the research under the Faraday Battery Challenge:innovation R&D,round 3 Project title:Scalable Ultra-Power Electric-vehicle Batteries(SUPErB)[project reference 105300]Thomas Ashton and Jawwad A.Darr would like to thank the EPSRC for funding the JUICED Energy Hub(EP/R023662/1)。
文摘A combinatorial library of twenty-three,phase pure,near-NMC111(LiNi_(0.33) Mn_(0.33)Co_(0,33)O_(2))composi-tions were synthesised and their electrochemical performance,was mapped(in lithium ion half-cells).Each of the 23 compositions was made in series,using a two-step process of 1)a rapid initial contin-uous hydrothermal precipitation,followed by 2)solid state lithiation.The 23 lithiated NMC samples were then subjected to analytical methods including electron microscopy(selected samples),Powder X-ray Diffraction and electrochemical tests in half cell Li-ion configurations versus Li metal.A sample with a Ni:Mn:Co(NMC)ratio of 39:28:33,revealed a specific capacity of 150 mA h g^(-1) at a C/20 rate,which was 63 and 43% greater capacity than NMC111 and NMC433 samples produced in this work,respectively.The sample with NMC ratio 47:25:28,showed the best capacity retention characteristics,retaining 70%of its C/20 capacity at 1C,after 40 cycles.Further analysis of all the samples by cyclic voltammetry and elec-trochemical impedance spectroscopy,allowed compositional mapping of diffusion coefficients.Overall,the mapping data revealed a gradual change of properties across compositional space,which has vali-dated our combinatorial approach and allowed identification of the optimum performing near-NMC111 cathode materials.
