Positive electrode slurry and preparation method thereof, positive electrode plate and lithium ion battery

The invention discloses positive electrode slurry and a preparation method thereof, a positive electrode plate and a lithium ion battery. Active substances of the positive electrode slurry comprise lithium manganate and nickel cobalt lithium manganate. According to the positive electrode slurry disclosed by the invention, the lithium manganate and the nickel cobalt lithium manganate are jointly used as active substances, so that the high-temperature cycle performance and the low-temperature discharge performance of the lithium ion battery can be improved. 本申请公开了一种正极浆料及其制备方法、正极极片、锂离子电池，所述正极浆料的活性物质包括锰酸锂和镍钴锰酸锂。本申请的正极浆料，通过将锰酸锂和镍钴锰酸锂共同作为活性物质，可以提升锂离子电池高温循环性能和低温放电性能。