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Preparation method of high-capacity single-crystal positive electrode battery material and product

A positive battery, high-capacity technology, applied in the growth of polycrystalline materials, positive electrodes, single crystal growth, etc., can solve the problems of difficult lithium ion diffusion, limit the development of single crystal materials, etc., to improve the diffusion rate, stability and cycle. Good performance and the effect of increasing capacity

Pending Publication Date: 2022-03-22
SINOSTEEL ANHUI TIANYUAN TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method and product of a high-capacity single crystal positive electrode battery material to solve the problem that the diffusion of lithium ions in single crystal positive electrode materials is relatively difficult and limits the development of single crystal materials

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  • Preparation method of high-capacity single-crystal positive electrode battery material and product

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preparation example Construction

[0027] The preparation method in the above-mentioned embodiment specifically includes the following steps:

[0028] (1) Prepare the solution of the iron source, nickel source, cobalt source, manganese source, ferrous source, and magnesium source in container a in proportion; then prepare the nickel source, cobalt source, and manganese source of battery level in proportion The solution is in container b;

[0029] Iron source in container a: nickel source: cobalt source: manganese source: ferrous source: magnesium source molar ratio should be 0.2~6:1:1:1:1:1; nickel source in container b: cobalt source: manganese source mole The ratio should be 6~9:0.5~2.5:0.5~2.5; the molar ratio of the total metal cations in container a to the total metal cations in container b should be 1:4~30;

[0030] The iron source can be battery-grade sulfate, nitrate or chloride corresponding to +3 valence; the nickel source, cobalt source, manganese source, ferrous source, and magnesium source can be ...

Embodiment 1

[0040] (1) Prepare battery grade 3mol ferric sulfate, 1mol nickel sulfate, 1mol cobalt sulfate, 1mol manganese sulfate, 1mol ferrous sulfate, 1mol magnesium sulfate solution in container a in proportion; prepare battery grade nickel sulfate 26.4mol, cobalt sulfate 8.8 mol, manganese sulfate 8.8mol solution in container b;

[0041] (2) Add all the solution in container a into reactor A and stir, then add 2L of 12mol / L sodium hydroxide solution to reaction vessel A, control the reaction pH at 12.5, and continue stirring for 10h after adding the sodium hydroxide solution; Finally, add the container b solution, 2.2L of 10mol / L ammonia water, and 6mol / L sodium hydroxide solution into reactor A, control the reaction pH at 11, wash the obtained slurry, filter and dry to obtain powder d;

[0042] (3) Fully mix the powder d obtained in step (2) and 60.5 mol of lithium source, put them into a tube furnace and heat at 4°C / min to 850°C, keep it warm for 8h, during which an oxygen atmosphe...

Embodiment 2

[0044] (1) Prepare battery grade 1.5mol ferric sulfate, 1mol nickel sulfate, 1mol cobalt sulfate, 1mol manganese sulfate, 1mol ferrous sulfate, 1mol magnesium sulfate solution in container a; prepare battery grade nickel sulfate 67.2mol, cobalt sulfate A solution of 19.2mol and 9.6mol of manganese sulfate is in container b;

[0045] (2) Add all the solution in container a to reactor A and stir, then add 2.94L of 6mol / L sodium hydroxide solution to reaction container A, control the reaction pH at 12, continue stirring for 18h after adding the sodium hydroxide solution ; Finally, add the container b solution, 6mol / L ammonia water 3.2L, and 12mol / L sodium hydroxide solution into the reactor A, control the reaction pH at 11.5, wash the obtained slurry, filter and dry to obtain powder d;

[0046] (3) Fully mix the powder d obtained in step (2) and 108.2 mol of lithium source, put them into a tube furnace and heat to 760°C at 1°C / min, keep warm for 2h, during which an oxygen atmosph...

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Abstract

The invention discloses a preparation method of a high-capacity single-crystal positive electrode battery material and a product, relates to the technical field of single-crystal high-entropy battery materials, and aims to solve the problems that lithium ion diffusion of a single-crystal positive electrode material is relatively difficult, and the development of a single-crystal material is limited. The preparation method comprises the following steps: preparing a rod-like single crystal oxide by using a superfine needle-like iron-rich base high-entropy material as a crystal nucleus so as to improve the diffusion rate of lithium ions; the preparation method specifically comprises the following steps: preparing a battery-grade raw material solution, synthesizing a superfine needle-like iron-rich high-entropy material crystal nucleus under a high pH condition, continuously growing, adding lithium, and sintering to obtain a single crystal powder product; from another perspective, the rod-like single crystal oxide is prepared by using the superfine needle-like iron-rich base high-entropy material as a crystal nucleus, so that the diffusion path of lithium ions between electrolyte and single crystal internal lattices is shortened, and the problem that the lithium ions in the single crystal positive electrode material are difficult to diffuse is solved; the capacity, the cycling stability and the safety of a battery material product are improved, and meanwhile, a road is broadened for the development of a high-entropy material.

Description

technical field [0001] The invention relates to the technical field of single crystal high-entropy battery materials, in particular to a preparation method and product of a high-capacity single crystal positive electrode battery material. Background technique [0002] Single-crystal cathode materials consist of one or a few large grains, while traditional polycrystalline materials are usually spherical aggregates of many submicrocrystals. Particle pulverization in polycrystalline cathode materials is one of its more common failure modes, leading to exfoliation of active materials and increased surface area, which is especially evident in nickel-rich materials. The single crystal ternary material has no grain boundaries inside, which can effectively deal with the problem of grain boundary breakage and the resulting performance degradation. Compared with commercial polycrystalline ternary materials, single crystal ternary materials have better performance at room temperature a...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B29/62C30B1/02H01M4/505H01M4/525H01M4/485H01M10/0525
CPCC30B29/22C30B29/62C30B1/02H01M4/505H01M4/525H01M4/485H01M10/0525H01M2004/028Y02E60/10
Inventor 李晓祥裴晓东骆艳华
Owner SINOSTEEL ANHUI TIANYUAN TECH
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