Electrode binder slurry composition for lithium ion electrical storage devices
A technology of composition and binder, applied in the direction of non-aqueous electrolyte battery electrodes, lithium batteries, battery electrodes, etc., can solve problems, existing health and environmental problems
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Embodiment 1
[0178] A (meth)acrylic copolymer dispersant was prepared as follows: 375.4 g of triethyl phosphate (TEP) was added to a four necked round bottom flask equipped with mechanical stirring blades, thermocouple and reflux condenser. The flask containing TEP solvent was heated to a set point of 120 °C under nitrogen atmosphere. Make containing 228.2g methyl methacrylate (MMA), 215.7g 2-ethylhexyl acrylate (EHA), 58.4g ethyl acrylate (EA), 58.4g N-vinylpyrrolidone (NVP), 11.5g acrylate hydroxy A monomer solution of ethyl ester (HEA) and 11.5 g of methacrylic acid (MAA) was thoroughly mixed in a separate vessel. A solution of 12.9 g of tert-amyl peroxy 2-ethylhexyl carbonate (Trigonox 131, available from AkzoNobel) and 61.1 g of TEP was prepared and added to the flask over 185 minutes. Five minutes after starting the initiator solution, the addition of the monomer solution was started and the monomer solution was added to the flask over a period of 180 minutes. After both the initia...
Embodiment 2
[0181] The binder was prepared as follows: Triethyl phosphate (41.67 g) and the dispersant of Example 1 (26.89 g) were added to a plastic cup. Stir the mixture with a dispersing blade until the acrylic is thoroughly incorporated into the solvent. Subsequently, a polyvinylidene fluoride polymer (31.59 g of PVDF T-1 from Inner Mongolia 3F Wanhao Fluorochemical Co., Ltd.) was slowly added over 30 to 60 minutes while stirring with a dispersing blade until the PVDF was completely incorporated into the mixture. The measured total non-volatile content of this slurry was 45.24% by weight.
[0182] The solids content of all compositions except the dispersant composition was measured by the following procedure. Aluminum weighing pans from Fisher Scientific were weighed using an analytical balance. The weight of the empty pan is recorded to four decimal places. Add approximately 1 g of the dispersion to the weighing pan. The weight of the pan and wet dispersion is reported to four de...
Embodiment 3
[0184] The electrode slurry was prepared as follows: triethyl phosphate (14.83 g) and binder from Example 2 (2.15 g) were added to a plastic cup. Conductive carbon LITX200 (Cabot Corporation) (0.72 g) was added in 2 portions and each sequential blend was mixed in a double asymmetric centrifugal mixer at 2000 rpm for 5 minutes. Cathode active powder NMC 111 (EQ-Lib-LNCM111, MTI Corporation) (22.33 g) was added in 2 portions and each sequential blend was mixed for 5 minutes at 2000 rpm in a double asymmetric centrifugal mixer to produce a formulated slurry material. The total non-volatile content of this slurry was 60.0% by weight. The final ratio of NMC111:carbon:binder dry solids was 93:3:4.
[0185] Wet films were prepared on aluminum foil by knife coating this formulated slurry using a doctor blade. This wet film was heated in an oven to a maximum temperature of 120°C for at least 10 minutes. After cooling, the dry film average thickness was determined to be 106 microns ...
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