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Method for reducing residual alkali content of high-nickel material and prepared low-residual-alkali high-nickel material

A technology with high nickel and residual alkali, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problem of high residual alkali, achieve the effect of reducing damage, reducing complexity and shortening the process cycle

Active Publication Date: 2021-03-16
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for reducing the residual alkali content of high-nickel materials and the prepared low-residual alkali and high-nickel material. For the problem of high residual alkali in the product, the method adopts the gradient sintering method, sets a low-temperature platform, melts the weak salt additive in the low-temperature platform, and consumes LiOH and Li on the surface of the high-nickel ternary material through the molten weak salt additive. 2 CO 3 Equal residual alkali

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  • Method for reducing residual alkali content of high-nickel material and prepared low-residual-alkali high-nickel material
  • Method for reducing residual alkali content of high-nickel material and prepared low-residual-alkali high-nickel material

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Embodiment 1

[0039] This embodiment provides a method for reducing the residual alkali content of high-nickel materials, and the method specifically includes the following steps:

[0040] (1) High-nickel ternary cathode material precursor Ni 0.6 co 0.3 mn 0.1 (OH) 2 , Lithium hydroxide and additives are mixed evenly to obtain a mixed material. The molar ratio of the lithium element in lithium hydroxide to the nickel-cobalt-manganese element in the precursor of the high-nickel ternary positive electrode material is 1.02. The additives include lithium sulfate and ammonium dihydrogen phosphate, lithium sulfate The addition amount of the ammonium dihydrogen phosphate accounts for 0.1wt% of the mass of the high-nickel ternary cathode material precursor, and the addition amount of ammonium dihydrogen phosphate accounts for 0.4wt% of the mass of the high-nickel ternary cathode material precursor;

[0041] (2) The mixed material is heated to 700°C at a heating rate of 1°C / min, and kept for 10 h...

Embodiment 2

[0045] This embodiment provides a method for reducing the residual alkali content of high-nickel materials, and the method specifically includes the following steps:

[0046] (1) High-nickel ternary cathode material precursor Ni 0.65 co 0.15 mn 0.2 (OH) 2 , Lithium hydroxide and additives are mixed evenly to obtain a mixed material. The molar ratio of the lithium element in lithium hydroxide to the nickel-cobalt-manganese element in the precursor of the high-nickel ternary positive electrode material is 1.03, and the additives include ammonium sulfate and lithium metaphosphate, ammonium hydrogen sulfate The addition amount of lithium metaphosphate accounts for 0.1wt% of the mass of the high-nickel ternary cathode material precursor, and the addition amount of lithium metaphosphate accounts for 0.2wt% of the mass of the high-nickel ternary cathode material precursor;

[0047] (2) The mixed material is heated to 800°C at a heating rate of 2°C / min, and kept for 8 hours; then c...

Embodiment 3

[0051] This embodiment provides a method for reducing the residual alkali content of high-nickel materials, and the method specifically includes the following steps:

[0052] (1) High-nickel ternary cathode material precursor Ni 0.7 co 0.1 mn 0.2 (OH) 2 , Lithium hydroxide and additives are mixed uniformly to obtain a mixed material, the molar ratio of lithium element in lithium hydroxide to nickel-cobalt-manganese element in the precursor of high-nickel ternary positive electrode material is 1.04, and additives include ammonium hydrogen sulfate and lithium metaphosphate, hydrogen sulfate The amount of ammonia added accounts for 0.3wt% of the mass of the precursor of the high-nickel ternary cathode material, and the amount of lithium metaphosphate added accounts for 0.2wt% of the mass of the precursor of the high-nickel ternary cathode material;

[0053] (2) The mixed material is heated to 850°C at a heating rate of 3°C / min, and kept for 8 hours; then cooled to 400°C at a c...

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Abstract

The invention provides a method for reducing the residual alkali content of a high-nickel material, which comprises the following steps of: mixing a high-nickel ternary positive electrode material precursor, a lithium salt and an additive, and carrying out gradient sintering to obtain a low-residual-alkali high-nickel ternary monofired product, wherein the additive is a weak acid salt. According to the method, a gradient sintering mode is adopted, a low-temperature platform is arranged, a weak acid salt additive is molten in the low-temperature platform, and residual alkali such as LiOH and Li2CO3 on the surface of the high-nickel ternary material is consumed through the molten weak acid salt additive.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-nickel materials, and relates to a method for reducing the residual alkali content of high-nickel materials and a prepared low-residual alkali and high-nickel material. Background technique [0002] In recent years, due to the excessive exploitation and use of traditional energy by human beings, it not only leads to the shortage of traditional energy resources, but also causes many global problems such as environmental pollution and greenhouse effect. Therefore, the development of environmentally friendly and renewable new energy sources is considered to be an important way to replace traditional energy sources. As a new type of battery in new energy sources, lithium-ion batteries stand out among many chemical power sources due to their high energy density, long cycle life, environmental friendliness and high safety, and have attracted widespread attention from human society. Cathode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525
CPCC01G53/44H01M4/505H01M4/525C01P2006/80Y02E60/10
Inventor 李嘉俊崔军燕任海朋陈婷婷
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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