Improving the cycling stability of lithium-ion batteries with a dry-processed cathode via the synergistic effect of carboxymethyl cellulose and siloxane
The solvent-free dry process for fabricating battery electrodes has received widespread attention owing to its low cost and environmental friendliness.However,the conventional polytetrafluoroethylene(PTFE)used as a binder in the preparation of dry-processed electrodes results in in-sufficient adhesion,limiting their practical industrial appli-cations.Herein,we reported an industrially viable dry process for producing lithium-ion batteries using the combination of carboxymethyl cellulose(CMC)and siloxane as the binder composite.The synergistic effect of CMC and siloxane en-hanced the adhesive performance of the electrode,thereby improving the mechanical strength and electrochemical per-formance of the developed dry-processed electrode.Half cells based on aluminum-doped lithium manganese oxide(LMA)dry-processed electrodes with CMC and siloxane(LMA/CS)exhibited a capacity retention of 79.8％after 200 cycles at 1 C.Furthermore,LMA/CS||lithium titanate oxide full cells with a high mass loading of 20.6 mg cm-2 demonstrated an excellent capacity retention of 89.2％after 1000 cycles,which is con-siderably higher than that of cells based on slurry-processed electrodes prepared with a polyvinylidene fluoride binder and conventional dry-processed electrodes prepared using a PTFE binder.
The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials,Institute of Polymer Chemistry,College of Chemistry,Nankai University,Tianjin 300071,China
Renewable Energy Conversion and Storage Center(RECAST),Nankai University,Tianjin 300071,China
Tianjin Plan Nano Co.,Ltd,Tianjin 300071,China
State Key Laboratory of Elemento-Organic Chemistry,Nankai University,Tianjin 300071,China
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lithium-ion batteries dry process binder high per-formance siloxane
National Natural Science Foundation of ChinaMinistry of Science and Technology of ChinaHigher Education Discipline Innovation Project(111 Project)
NETL
NSTL
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