Lithium iron phosphate battery positive electrode pulp, lithium iron phosphate battery using positive electrode pulp and preparation method thereof

Abstract

The invention provides lithium iron phosphate battery positive electrode pulp, a lithium iron phosphate battery using the positive electrode pulp and a preparation method thereof. The positive electrode pulp consists of the following ingredients in percentage by weight: 40 to 55 percent of lithium iron phosphate, 2 to 5 percent of conductive agents, 3 to 5 percent of aqueous bonding agents and 40 to 55 percent of solvents. The battery comprises an electrode sheet coated with the positive electrode pulp. The aqueous positive electrode pulp of the invention greatly improves the positive electrode lithium iron phosphate active material amount, the electrode sheet of the positive electrode has friendly effect on the moisture, and adverse phenomena such as water absorption powder dropping, material dropping and the like can not occur, and the electrode sheet of the positive electrode has good softness and adhesive performance after tabletting, and has good effect in the cutting and conversion operation processes. The solvents in the positive electrode pulp relatively have environment protection effect, and the safety performance of the aqueous bonding agents is stable. The battery of the invention has good integrated performance, high discharging power, capability of fast charging and long circulation life. The preparation method of the battery has good pulp dispersion effect and coating effect.

Description

technical field [0001] The invention relates to the field of chemical energy materials, in particular to a positive electrode slurry for a lithium iron phosphate battery, a lithium iron phosphate battery using the positive electrode slurry and a preparation method thereof. Background technique [0002] Lithium-ion battery, as an environmentally friendly high-performance rechargeable battery, has been widely used in the fields of electronic products and communication tools. Among them, lithium iron phosphate (LiFePO 4 ) batteries have become the main force of the new generation of lithium-ion batteries due to their good thermal stability and cycle performance. [0003] The existing lithium iron phosphate (LiFePO 4 ) The positive electrode of the battery is mainly made of oil-based slurry, and the oil-based slurry is generally a system composed of a binder PVDF and a solvent N-methylpyrrolidone (NMP). However, in the actual production and use of the oil-based lithium iron p...

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Problems solved by technology

[0008] In order to solve the above-mentioned problems in the prior art, the present invention aims at batching the positive electrode slurry in a water system, and provides a positive electrode slurry for a lithium iron phosphate battery, a lithium iron phosphate battery using the positive electrode slurry, and a preparation method thereof. The lithium iron phosphate active material in the positive electrode slurry is high in quality, the softness and adhesiveness of the battery positive electrode sheet after pressing are good, it is environmentally friendly and has good safety performance, and there are no obvious adverse phenomena such as water absorption, powder removal, and material dropout during the preparation process Appear

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