Novel high-nickel ternary anode material and preparation

Abstract

The invention relates to a novel high-nickel ternary anode material and preparation, and belongs to the field of a lithium ion battery anode material. Firstly, a NixCoyMnz(OH)2 (x+y+z=1, wherein y issmaller than or equal to 0.1, and x is greater than 0.6 but is smaller than 0.8) spherical precursor is prepared by a coprecipitation method; then, the mixing is performed with lithium salt with the stoichiometric proportion by a rheological phase method; then, through high-temperature calcination, a spherical NixCoyMnz(OH)2 (x+y+z=1, wherein y is smaller than or equal to 0.1, and x is greater than 0.6 but is smaller than 0.8) high-nickel ternary anode material is prepared. The Ni content is controlled to be 0.6 to 0.8; the Co content is controlled to be 0.1 or below, so that the characteristics of high capacity and low cost are ensured. In addition, by regulating the Mi and Mn stoichiometric proportion, the positive ion mixing degree can be reduced; the material surface crystalline structure is stabilized. The tap density of the high-nickel ternary anode material is 3.5mg / cm<3>; the reversible capacity reaches up to 200mAh / g; excellent cycle performance and rate performance are realized; the novel high-nickel ternary anode material has wide application prospects when being used as a high-energy density lithium ion battery anode material.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a novel high-nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] The cathode material is one of the core materials of the lithium-ion battery, and the performance of the cathode material plays a decisive role in the electrochemical performance of the lithium-ion battery. Therefore, it is particularly necessary for the research and development of cathode materials. Finding cathode materials with large capacity, good cycle stability, high safety and low cost has always been the goal of researchers. Currently LiCoO 2 The cathode material has the highest commercial degree and the most mature production technology, and it occupies a large share in today's cathode material market. However, LiCoO 2 The material itself has some significant disadvantages: first, Co is a rare element and is not e...

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Problems solved by technology

However, LiCoO 2 The material itself has some significant disadvantages: first, Co is a rare element and is not easy to mine, which increases the production cost of the material; second, Co is poisonous and will cause certain harm to the human body and the environment; third, LiCoO 2 The actual discharge specific capacity is low, only about half of the theoretical capacity; Fourth, the stability of the material during use is poor, which is likely to bring safety hazards. These defects limit the further expansion of the material's market share

[0005] Although LiNi has been successfully commercialized 1 / 3 co 1 / 3 mn 1 / 3 o 2 、LiNi 0.4 co 0.2 mn 0.4 o 2 、LiNi 0.5 co 0.2 mn 0.3 o 2 、LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary cathode materials, but they still have disadvantages such as low specific capacity, high Co content, and difficult cost compression

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