Nanostructured Conductive Polymer Gels as a General Framework Material To Improve Electrochemical Performance of Cathode Materials in Li-Ion Batteries

Controlling architecture of electrode composites is of particular importance to optimize both electronic and ionic conduction within the entire electrode and improve the dispersion of active particles, thus achieving the best energy delivery from a battery. Electrodes based on conventional binder sy...

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Bibliographic Details
Published in:Nano letters 2017-03, Vol.17 (3), p.1906-1914
Main Authors: Shi, Ye, Zhou, Xingyi, Zhang, Jun, Bruck, Andrea M, Bond, Andrew C, Marschilok, Amy C, Takeuchi, Kenneth J, Takeuchi, Esther S, Yu, Guihua
Format: Article
Language:English
Subjects:
Binders
charge transport
conductive polymer
electrochemistry
Electrode materials
Electrodes
Electronics
ENERGY STORAGE
energy storage (including batteries and capacitors)
ENGINEERING
gel framework
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
lithium ion battery
lithium iron phosphate
Lithium-ion batteries
mesostructured materials
Nanostructure
Particulate composites
Rechargeable batteries
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Summary:Controlling architecture of electrode composites is of particular importance to optimize both electronic and ionic conduction within the entire electrode and improve the dispersion of active particles, thus achieving the best energy delivery from a battery. Electrodes based on conventional binder systems that consist of carbon additives and nonconductive binder polymers suffer from aggregation of particles and poor physical connections, leading to decreased effective electronic and ionic conductivities. Here we developed a three-dimensional (3D) nanostructured hybrid inorganic-gel framework electrode by in situ polymerization of conductive polymer gel onto commercial lithium iron phosphate particles. This framework electrode exhibits greatly improved rate and cyclic performance because the highly conductive and hierarchically porous network of the hybrid gel framework promotes both electronic and ionic transport. In addition, both inorganic and organic components are uniformly distributed within the electrode because the polymer coating prevents active particles from aggregation, enabling full access to each particle. The robust framework further provides mechanical strength to support active electrode materials and improves the long-term electrochemical stability. The multifunctional conductive gel framework can be generalized for other high-capacity inorganic electrode materials to enable high-performance lithium ion batteries.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.6b05227