Journal
CHEMSUSCHEM
Volume 13, Issue 10, Pages 2650-2660Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201903483
Keywords
batteries; energy transfer; lithium; manganese; polymers
Funding
- German Federal Ministry of Education and Research within the Li-EcoSafe project [03X4636A, 03X4636D]
- Helmholtz Association
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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.
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