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Co‐Crosslinked Water‐Soluble Biopolymers as a Binder for High‐Voltage LiNi(0.5)Mn(1.5)O(4)|Graphite Lithium‐Ion Full Cells

The use of water‐soluble, abundant biopolymers as binders for lithium‐ion positive electrodes is explored because it represents a great step forward towards environmentally benign battery processing. However, to date, most studies that employ, for instance, carboxymethyl cellulose (CMC) as a binder...

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Detalles Bibliográficos
Autores principales: Kuenzel, Matthias, Choi, Hyeongseon, Wu, Fanglin, Kazzazi, Arefeh, Axmann, Peter, Wohlfahrt‐Mehrens, Margret, Bresser, Dominic, Passerini, Stefano
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7318297/
https://www.ncbi.nlm.nih.gov/pubmed/32125075
http://dx.doi.org/10.1002/cssc.201903483
Descripción
Sumario:The use of water‐soluble, abundant biopolymers as binders for lithium‐ion positive electrodes is explored because it represents a great step forward towards environmentally benign battery processing. However, to date, most studies that employ, for instance, carboxymethyl cellulose (CMC) as a binder have focused on rather low electrode areal loadings with limited relevance for industrial needs. This study concerns the use of natural guar gum (GG) as a binding agent for cobalt‐free, high‐voltage LiNi(0.5)Mn(1.5)O(4) (LNMO), which realizes electrodes with substantially increased areal loadings, low binder content, and greatly enhanced cycling stability. Co‐crosslinking GG through citric acid with CMC allows for an enhanced rate capability and essentially maintains the beneficial impact of using GG as a binder rather than CMC only. Lithium‐ion full cells based on water‐processed LNMO and graphite electrodes provide a remarkably high cycling stability with 80 % capacity retention after 1000 cycles at 1 C.