A kind of nickel-cobalt-manganese ternary material coated with lithium manganese silicate and preparation method thereof

Abstract

The invention discloses a nickel-cobalt-manganese ternary material coated with lithium manganese silicate and a preparation method thereof. The general chemical formula is Li (1+4n) Ni x co y mn (1‑x‑y+n) Si n o 2+4n , where, 0.6≤x≤0.7, 0.1≤y≤0.2, 0≤n≤0.05; the method prepares a sintered LiNi x co y mn (1‑x‑y) o 2 , and then the primary sintered LiNi x co y mn (1‑x‑y) o 2 Add it into the manganese lithium silicate coating solution, and finally sinter to obtain the nickel cobalt lithium manganese oxide ternary material coated with manganese lithium silicate; like this, the present invention utilizes the advantages of high capacity and high safety of manganese lithium silicate to Its coating and the surface of the ternary material can improve the capacity and safety of the material; and by combining the long cycle life of the ternary material itself, an ideal power battery cathode material can be obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nickel-cobalt-manganese ternary material coated with lithium manganese silicate and a preparation method thereof. Background technique [0002] With its high working voltage, low self-discharge effect and good cycle performance, lithium-ion batteries are widely used in communications, portable computers and electronic energy storage devices; It is one of the short boards of pure electric vehicles, so it is imminent to increase the capacity of positive electrode materials, especially for the higher energy density of lithium ion battery positive electrode materials. Therefore, it is necessary to develop new lithium ion battery positive electrode materials. [0003] In recent years, cathode materials prepared from cobalt oxides and nickel oxides are currently the most widely used materials, but materials prepared from cobalt and nickel have problems in te...

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Problems solved by technology

[0003] In recent years, cathode materials prepared from cobalt oxides and nickel oxides are currently the most widely used materials, but materials prepared from cobalt and nickel have problems in terms of safety, material sources, and preparation processes. problems; and for other cathode materials, there are also aspects that need to be improved, for example: LiMn 2 o 4 Low price, good safety performance, but its theoretical capacity is not high, cycle performance and thermal stability are poor; LiFePO 4 Although it has good thermal stability and cycle performance, as well as high specific energy and safety, its low electronic conductivity and lithium ion diffusion rate have become a major obstacle to its continued research and application; for this reason, Nytén et al. proposed for the first time Lithium manganese silicate (Li2MnSiO4) is considered to be the most ideal lithium ion battery cathode material with its high specific capacity of 333mAh / g.

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