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 LiNi0.5Mn1.5O4 (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.
Co-crosslinked water-soluble biopolymers as a binder for high-voltage LiNi0.5Mn1.5O4| graphite lithium-ion full cells / Kuenzel, Matthias; Choi, Hyeongseon; Wu, Fanglin; Kazzazi, Arefeh; Axmann, Peter; Wohlfahrt-Mehrens, Margret; Bresser, Dominic; Passerini, Stefano. - In: CHEMSUSCHEM. - ISSN 1864-5631. - 13:10(2020), pp. 2650-2660. [10.1002/cssc.201903483]
Co-crosslinked water-soluble biopolymers as a binder for high-voltage LiNi0.5Mn1.5O4| graphite lithium-ion full cells
Passerini, Stefano
2020
Abstract
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 LiNi0.5Mn1.5O4 (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.File | Dimensione | Formato | |
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