A kind of preparation method of hollow structure coating cathode material

Abstract

The invention discloses a preparation method of a hollow structure coated positive electrode material. The preparation method of the hollow structure coated positive electrode material comprises the following steps: (1) preparing a C / S composite material; (2) preparing a nickel manganese oxide with a hollow structure; and (3) preparing a hollow structure coated positive electrode material. According to the preparation method, the cycle performance of a carbon sulfur composite material is improved by coating the nickel manganese oxide with the hollow structure; the battery positive electrode material provided by the invention can inhibit the self-discharge reaction of a polysulfide, and is combined with O so as to form a chemical bond which is more stable than the Mn-O bond energy to stabilize a nickel manganese acid lithium lattice structure and effectively inhibit the problem of collapse of a nickel manganese acid lithium lattice as Mn3<+> is dissolved into electrolyte, so that the reversible performance of the battery and the capacity retention rate in the cycle process can be improved.

Description

technical field [0001] The invention relates to a battery cathode material. Background technique [0002] The development of portable electronic communication equipment puts forward higher requirements for the performance of the chemical power source used, especially for the specific energy of the battery. Metal lithium / sulfur battery has a theoretical specific capacity of 1675mAh / g-1, and the elemental sulfur cathode material has the advantages of abundant sources, low price, environmental friendliness, and good battery safety. Therefore, lithium-sulfur batteries are considered to be the next generation of energy The most promising battery system offering high specific energy. However, since elemental sulfur is a typical electron and ion insulator, the intermediate polysulfide produced during the reduction process is easily soluble in the organic liquid electrolyte, and part of the dissolved polysulfide diffuses to the surface of the metal lithium anode and undergoes a sel...

AI Technical Summary

Problems solved by technology

However, since elemental sulfur is a typical electron and ion insulator, the intermediate polysulfide produced during the reduction process is easily soluble in the organic liquid electrolyte, and part of the dissolved polysulfide diffuses to the surface of the metal lithium anode and undergoes a self-discharge reaction with it, accelerating Corrosion of lithium to generate disordered Li 2 S 2 and Li 2 S is a partially irreversible reaction, and this series of problems lead to low utilization of electrode active materials and poor battery cycle performance.

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