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Preparation method of water-based composite binder for lithium ion battery with common electronic and ion conductivity
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A lithium-ion battery, ion conductivity technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of small joint surface, unfavorable ion and electron conduction, and incomplete adhesion of positive electrode film
Active Publication Date: 2018-02-27
李国富 +1
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However, this type of composite system is in point contact with the active material, the bonding surface is small, and the long-range connection between the manufactured electrode particles is lacking, which is not conducive to the conduction of ions and electrons. As a result, the prepared positive electrodeslurry is coated on the aluminum foil. After drying, The positive electrode film cannot be completely attached to the aluminum foilcurrent collector, especially the single-sided aluminum foil, and the adhesion of the binder system to the current collector is not enough; moreover, the prepared battery has large polarization and poor electrical performance, so it cannot be applied in industry
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Embodiment 2
[0038] [Example 2] The method steps are the same as above, except that the ratio of binder, conductive agent and active material is 8:10:82.
[0039] [Example 3] The method steps are the same as above, except that the ratio of binder, conductive agent and active material is 6:10:84.
[0040] [Example 4] The method steps are the same as above, the difference is that the active material is replaced by LiAl 0.04 mn 1.96 o 4 , the ratio of binder, conductive agent and active material is 8:10:82.
[0041][Example 5] The method steps are the same as above, the difference is that the composite binder is composed of partially hydrolyzed polyacrylamide, polyvinyl alcohol, lithium silicateaqueous solution, and the active material is LiFePO 4 , the ratio of binder, conductive agent and active material is 10:10:80.
Embodiment 6
[0042] [Example 6] The method steps are the same as above, the difference is that the composite binder is composed of polyethyleneoxide, polyvinyl alcohol, lithium silicateaqueous solution, and the active material is LiFePO 4 , the ratio of binder, conductive agent and active material is 10:10:80.
[0043] [Example 7] The method steps are the same as above, the difference is that the composite binder is composed of polyethyleneoxide, polyvinylpyrrolidone, lithium silicateaqueous solution, and the active material is LiFePO 4 , the ratio of binder, conductive agent and active material is 10:10:80.
Embodiment 8
[0044] [Example 8] The method steps are the same as above, the difference is that the composite binder is composed of polyacrylamide, polyethylene glycol, lithium silicate aqueous solution, and the active material is LiFePO 4 , the ratio of binder, conductive agent and active material is 10:10:80.
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Abstract
The invention discloses a preparation method of an aqueous composite binder having electronic and ionic conductivity generality for a lithiumion battery; a flexibilizer, an ionic binder and a water-soluble polymer are blended to form a polymer matrix, wherein the ionic binder provides a lithium source; furthermore, the polymer matrix is capable of conducting lithiumion; a conductive agent is dispersed into the polymer matrix to form a composite conductive polymer; and a filling material is added into a polymeric system, so that a conductive network is formed. The aqueous composite binder prepared by the preparation method disclosed by the invention is an electronic conductor and also is an ion conductor; therefore, the content of lithium ion in a positive plate can be effectively increased; and the cycling stability of the battery is increased.
Description
technical field [0001] The invention relates to the fields of material chemistry and new energy, in particular to a preparation method of a water-based composite binder and the application of the water-based composite binder prepared by the method to the preparation of lithium-ion battery cathode sheets. Background technique [0002] Lithium-ion batteries, as the pioneer of the contemporary battery industry, are mainly used in rechargeable batteries for portable electronic products, power tools and electric vehicles. The domestic and foreign electric vehicle markets continue to expand, and the demand for lithium-ion batteries will also continue to grow. The preparation of lithium-ion batteries requires an auxiliary material binder, which is also an important factor affecting the composition of the battery and its overall performance. [0003] The charging and discharging process of lithium-ion batteries is a cyclic process in which lithium ions and electrons participate tog...
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