Modified nickel oxide negative material and preparation method thereof

Abstract

The invention discloses a modified nickel oxide negative material. Nickel oxide with a hollow structure is taken as a matrix and is doped with metal elements (including one or more of lithium, sodium and potassium). A preparation method of the modified nickel oxide negative material comprises the following steps: dissolving metal element nitrate and nickel nitrate in water for mixing uniformly to obtain a mixed liquor, and then performing spray pyrolysis treatment on the obtained mixed liquor, thereby obtaining the modified nickel oxide negative material, wherein a metal element is one or more of lithium, sodium and potassium, and the molar concentration ratio of metal ions and nickel ions in the mixed liquor is equal to (1:100)-(10:100). The nickel oxide negative material has a hollow spherical feature, so that diffusion paths of lithium ions are reduced, and the volume change in a circulating process is alleviated to a certain degree. As nickel oxide is doped with the metal elements including lithium, sodium and potassium, the conductivity of the material is improved, the charge transfer impedance is lowered, and the electrochemical performance of a battery is improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a novel metal element-doped nickel oxide negative electrode material and a preparation method thereof. Background technique [0002] With the increasing demand for clean and high-power energy storage devices, transition metal oxide anodes have attracted considerable attention due to their considerable reversible capacity and higher energy density compared with graphite anodes. Among them, nickel oxide has a theoretical capacity of up to 718mAhg due to its low cost and low toxicity. -1 , has become an important research direction of high energy density battery materials. However, nickel oxide, like all transition metal oxides, has two fatal defects that limit its practical application in lithium-ion battery materials: one is the poor conductivity of nickel oxide, and the other is that the large volume change during the cycle is likely to cause material damage. The st...

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Problems solved by technology

[0003] At present, a method of doping nickel oxide is also proposed. The patent with the publication number of CN102104147A discloses a nickel-cobalt composite oxide, a nickel-cobalt doped oxide and a preparation method thereof. The patent prepares a trivalent hydroxide precursor , so that high-valent doping elements such as aluminum and gallium can enter the material lattice, and the product has good sphericity, complete crystallization, and good activity. However, in order to oxidize nickel and cobalt to trivalent, various reagents need to be added during the process of precipitation , and to control the potential and pH value, after precipitation, aging, filtration and finally spray pyrolysis are required. Therefore, the process has the disadvantages of complicated process, strict process requirements, and high cost.

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