A high-voltage positive electrode sheet and its preparation method

Abstract

The invention relates to the technical field of lithium batteries, in particular to a high-voltage positive plate and a preparation method thereof. The high-voltage positive plate comprises a positivecurrent collector and a positive pulp layer coated on the surface of the positive current collector, the positive pulp layer is obtained by carbonating a positive active material, a composite conductive agent and binder, and the composite conductive agent is composed of 57-79wt% of cellulose, 20-40wt% of graphene and 1-3wt% of aluminite powder. The high-voltage positive plate and the preparationmethod thereof have the advantages that the cellulose is added into the composite conductive agent, the high-voltage positive plate has a better network structure after the cellulose is carbonized, the migration rate of lithium ions in an electrode material can be effectively improved, the charging and discharging efficiency is improved, the use amount of the graphene is reduced, and the cost is reduced; a small amount of aluminum powder is added into the conductive agent, the practice shows that the electrical conductivity of the positive pulp layer can be effectively improved, and the effectof improving the charging and discharging of large current is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-voltage positive electrode sheet and a preparation method thereof. Background technique [0002] With the rapid development of electronic equipment and the increasingly prominent energy and environmental issues, people have put forward higher requirements for chemical power sources. Lithium-ion batteries have rapidly emerged in the market due to their high voltage, large specific energy, long cycle life, and no pollution, and have become a new type of clean, high-energy energy. Especially in the 21st century, with the rapid development and wide application of various portable electronic devices, wireless mobile communication devices, and electric vehicles, the demand for lithium-ion batteries with higher specific capacity, long cycle life, and low cost appears to be even greater. urgent. [0003] The key to improving the high specific energy index of lithium-io...

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Problems solved by technology

[0003] The key to improving the high specific energy index of lithium-ion batteries lies in the development of high specific energy positive electrode activity and the design of positive electrodes, and most researchers have devoted their main energy to the development of high specific energy positive electrode active materials, while ignoring the positive electrode. Design, especially the design of conductive agents

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