Method for preparing lithium titanate cathode size

Abstract

The invention relates to a method for preparing lithium titanate cathode size, belonging to the battery preparation method field. The method is characterized in that the lithium titanate cathode sizedis added with oxalic acid, wherein 1-6% of oxalic acid is added by taking the total weight of the cathode size as 100%. The method for adding oxalic acid includes: oxalic acid and lithium titanate are mixed in dry, fully mixed to be uniform and then added with other materials to be made into the lithium titanate cathode size; or materials except oxalic acid is firstly mixed into size, and then oxalic acid is added into the size and fully mixed to be uniform, so as to obtain the lithium titanate cathode size. The invention provides a method for preparing lithium titanate cathode size with highadhesive force with afflux surface and good bonding effect, thus being capable of effectively improving electrochemical performances of battery with lithium titanate as cathode such as capacity, cycle performance and the like.

Description

Technical field: [0001] The invention belongs to the field of battery preparation methods, in particular to a preparation method of a lithium titanate negative electrode slurry. Background technique: [0002] Since the commercial application of lithium-ion batteries in the 1990s, lithium-ion secondary batteries have accounted for more than 70% of the global secondary battery market size. Based on the safety considerations of lithium-ion batteries, it is necessary to find new anode materials to replace carbon materials. Spinel-type lithium titanate is used as a negative electrode material for lithium ion batteries, due to its + The higher potential of / Li, there is no problem of metal lithium precipitation during the charging and discharging process, which can greatly improve the safety performance of the battery; at the same time, spinel lithium titanate is also a zero-strain material with excellent cycle performance, which can It is widely used in electric tools, HEV (Hyb...

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Problems solved by technology

However, materials with small particle size have larger specific surface area and higher specific surface energy. When PVDF (polyvinylidene fluoride) oily system is used, the affinity with the current collector is poor, and the bonding effect is not good, so It has caused difficulties in the coating of materials in the actual production and application process, which seriously affects the electrochemical performance of batteries and other problems.