@article {44626, title = {Co9Se8 nanoparticles as high capacity anode material for lithium-ion batteries}, journal = {Materials Research Express}, volume = {5}, year = {2018}, month = {JUL}, pages = {075510}, abstract = {

Present investigation deal with the facile synthesis of Co9Se8 nanoparticles (NPs) and their application as the potential anode for lithium-ion battery (LIB). The primary size of the Co9Se8 NPs can be achieved between 10 similar to 25 nm while the secondary cluster size ranging from 150 similar to 200 nm as observed by transmission electron microscope (TEM). The specific capacity of Co9Se8 NPs LIB anode can reach around similar to 610 mAhg(-1) during charging (lithium ion released from Co9Se8 nanoparticles), and -730 mAhg(-1) during discharging (lithium ion intercalated) at an applied current density of similar to 100 mAg(-1). These values are significantly higher than that of the commercial graphite anode (theoretical capacity similar to 372 mAhg(-1)). The irreversibility of Co9Se8 anode (similar to 15\%) is also significantly lower than that of most metal oxides and silicon-based anodes (irreversibility ranging between 30 similar to 50\% or higher for Si). The reason for superior specific capacity and low irreversibility compared to metal oxides and silicon-based materials could be owing to the stable nano-cluster size which help to reduce the diffusion path and internal resistance to lithium ion.

}, keywords = {irreversibility, lithium-ion battery, lithium-ion diffusion, Nanoparticles, specific capacity}, issn = {2053-1591}, doi = {10.1088/2053-1591/aad16d}, author = {Kumar, Pushpendra and Hu, Lung-Hao} } @article {47340, title = {Architecture of NaFe(MoO4)2 as a novel anode material for rechargeable lithium and sodium ion batteries}, journal = {Applied Surface Science}, volume = {559}, year = {2021}, month = {SEP }, pages = {149903}, type = {Article}, abstract = {

In recent decades, particular focus has been given to enhance the capacity of LIBs and SIBs either by developing new materials or by modifying existing materials. Hence, we have demonstrated a new anode material i.e. sodium iron molybdate [NaFe(MoO4)2] for both LIBs and SIBs. NaFe(MoO4)2 has been successfully synthesized by solid-state combustion technique and tested as a promising new anode material for both LIBs and SIBs. A detailed analysis of the crystal structure has been performed using DFT calculations. NaFe(MoO4)2 crystallizes in the monoclinic phase with the space group C2/c (\#15). FESEM also shows highly crystalline monoclinic shaped crystals of micron size. When evaluated as an anode material for LIBs, NaFe(MoO4)2 electrode exhibited electrochemical capacity of 920 mAhg- 1 in the second cycle at the current density of 50 mAg-1. Though capacity decreases on further cycling, the coulombic efficiency was maintained at 99\% for 50 cycles. Significantly, a high discharge capacity of 100 mAhg- 1 was maintained at a very high rate of 1 Ag-1. On the other hand, we have also tested NaFe(MoO4)2 for SIBs which shows excellent reversible specific capacity i.e. 100 mAhg- 1 at the current density of 100 mAg-1 even after 500 cycles. This novel system has shown good stability for LIBs and SIBs which is hitherto unattempted.

}, keywords = {Electrochemical study, lithium-ion battery, Morphology, NaFe(MoO4)2, Sodium-ion battery}, issn = {0169-4332}, doi = {10.1016/j.apsusc.2021.149903}, author = {Tamboli, Asiya M. and Tamboli, Mohaseen S. and Praveen, C. S. and Dwivedi, Pravin Kumari and Karbhal, Indrapal and Gosavi, Suresh W. and Shelke, V, Manjusha and Kale, Bharat B.} } @article {49767, title = {Modulation of lithium ion transport and cycling stability using rigid and flexible urethane moieties on the backbone of polymers}, journal = {ACS Applied Materials \& Interfaces}, volume = {17}, year = {2025}, month = {NOV }, pages = {63784-63791}, type = {Article}, abstract = {

Graphite is the anode of choice for lithium-ion batteries. Due to volume change and poor conductivity of inorganic materials, they do not show comparable performance to that of graphite. Conjugated polymers are attractive because of their modularity and ease of synthesis. Herein, we report three polymers based on diketopyrrolopyrrole (DPP) as the anode. In an energy device, stored charges are due to a diffusive and capacitive component. Increasing the capacitive component is a challenge in both organic and inorganic systems. In our polymers, we installed urethane moieties that increase the capacitive component. The excellent Li+ ion transporting urethane moiety is part of the polymer chain. The Li+ ion transport is also impacted by the packing of the polymer chain. Therefore, the DPP units and urethane moieties are connected with either an alkyl chain, phenyl or biphenyl. The polymers with either alkyl or phenyl spacers showed stable cycling stability over 4000 charge-discharge cycles. On the other hand, the specific capacity of the batteries comprising a polymer with biphenyl started decreasing after 500 charge-discharge cycles. This is due to the solubility of the polymer in the battery electrolyte. The polymer with a phenyl spacer showed a higher Li+ ion diffusion coefficient due to the space generated between the polymer chains. The X-ray photoelectron spectroscopy analysis showed that the Li+ ions are bound to carbonyls, indicating the role of urethane in the charge transport. The polymer with an alkyl spacer showed a very high specific capacity of 600 mAh/g (1500th cycle) at a current density of 0.2 A/g, which is much higher than the theoretical capacity of graphite (372 mAh/g). The charge storage in all these polymers is dominated by a capacitive component, with the highest metric of 81\% shown by a polymer with an alkyl spacer.

}, keywords = {Cycling stability, diketopyrrolopyrrole, high capacity, lithium-ion battery, non-conjugatedpolymer, urethane}, issn = {1944-8244}, doi = {10.1021/acsami.5c15080}, author = {Kargude, Radhakisan and Rajendran, Prakash Babu and Kika, Sharmin Percy and Krishnamoorthy, Kothandam} } @article {49814, title = {Orthogonally Engineered Redox-Active Polyimide-Carbon Nanotube Hybrids for Long-Life Lithium-Ion Battery Cathode}, journal = {Small}, volume = {22}, year = {2026}, month = {JAN}, type = {Article}, abstract = {

The diverse structural tunability and engineered electronic properties of organic polymers have sparked significant interest in their use as cathode materials for lithium-ion storage. Recent advances suggest that organic cathodes can serve as promising alternatives to conventional metal oxide counterparts due to their elemental abundance, safety, and high theoretical capacity. However, developing cathode materials that simultaneously exhibit high specific capacity, long cycle life, and excellent rate performance remains a critical challenge. In this study, the synthesis and application of a redox-active polyimide based on orthogonally positioned, active site-rich mellitic trianhydride (MTA) and naphthalene diimide (NDI), integrated with multi-walled carbon nanotubes (MWCNTs), referred to as MTA-NDI@CNT are reported. The pristine MTA-NDI polymer demonstrates a specific capacity of 60 mAh g-1 at a current density of 200 mA g-1 and exhibits remarkable cycling stability over 20 000 cycles. Upon hybridisation with CNT (10 wt.\%), the composite (MTA-NDI@CNT) delivers a nearly threefold enhancement in specific capacity, reaching 170 mAh g-1 at 500 mA g-1, along with stable cycling performance over 1300 cycles and 60.5\% capacity retention.

}, keywords = {cathode, CNT, lithium-ion battery, orthogonality, Polyimide}, issn = {1613-6810}, doi = {10.1002/smll.202509881}, author = {Thanasekar, Chandragopal and Javaregowda, Bharathkumar H. and Veer, Sairam Dnyaneshwar and Devasia, George and Krishnamurty, Sailaja and Krishnamoorthy, Kothandam and Babu, Sukumaran Santhosh} }