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Fluorinated high-nickel ternary material as well as preparation method and application thereof

A high-nickel ternary material and fluorination technology, applied in chemical instruments and methods, inorganic chemistry, nickel compounds, etc., can solve problems such as increased internal resistance, small performance effects, and loss of nickel source, and achieve complete crystallinity , good rate performance, uniform dispersion effect

Active Publication Date: 2021-02-26
新乡天力锂能股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, people have invested a lot of research and development efforts on high-nickel ternary materials (NCM, NCA). Cobalt source and manganese source crystal synthesis conditions are very harsh, it is easy to cause a large loss of nickel source, and it is impossible to completely synthesize effective nickel-cobalt-manganese crystals
[0003] In order to solve the above problems, the research on the modification of the molded ternary materials is mainly carried out at this stage, but the effect of improving the performance is still very small.
Although the capacity of lithium battery ternary materials can be maximized at high voltage, as the number of cycles increases, secondary particles or agglomerated single crystals may appear in the later stage of primary particle interface differentiation or agglomerated single crystal separation, and the internal resistance changes. Large, the battery capacity will decay quickly, and the cycle performance will deteriorate

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  • Fluorinated high-nickel ternary material as well as preparation method and application thereof
  • Fluorinated high-nickel ternary material as well as preparation method and application thereof
  • Fluorinated high-nickel ternary material as well as preparation method and application thereof

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preparation example Construction

[0040] The invention provides a method for preparing a high-nickel fluoride ternary material, comprising the following steps:

[0041] Vacuum rectification is carried out on the electrolyte solution of the invalid lithium-ion battery, and the residual solution obtained is crystallized with ammonia water to obtain lithium fluoride;

[0042] Lithium fluoride, nickel sulfate, cobalt sulfate, manganese sulfate and water are mixed to obtain a mixed solution;

[0043] Mix the mixed solution and complexing agent, age to obtain a precursor; the chemical formula of the precursor is Ni x co y mn z (OH) 2 nLiF, wherein, x≥0.5, x+y+z=1; n=0.05~0.5;

[0044] The precursor and lithium hydroxide are mixed and then calcined to obtain the high-nickel fluoride ternary material.

[0045] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0046] In the invention, vacuum rectification is carrie...

Embodiment 1

[0070] After vacuum distillation of the spent lithium-ion battery electrolyte (vacuum degree of 1KPa, temperature of 115°C), the temperature is controlled at 65°C, and the residual liquid obtained by using ammonia water with a concentration of 1.5mol / L is washed several times to crystallize Lithium fluoride is obtained;

[0071] Lithium fluoride, NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, manganese sulfate and water mix, obtain mixed solution, wherein the mol ratio of Ni, Co and Mn is 8:1:1, and the total molar ratio of the mol of Li and Ni, Co and Mn is 0.05:1, described mixed solution The total concentration of solute in medium is 2mol / L;

[0072] At 60°C and a stirring rate of 320r / min, after adding ammonia water with a concentration of 2mol / L to the mixed solution, adjust the pH value to 12 with a NaOH solution with a concentration of 1.5mol / L, and wait for the nickel, cobalt, manganese After being completely deposited on the surface of lithium fluoride, after aging for 11 hours...

Embodiment 2

[0076] After vacuum rectification (vacuum degree: 0.8KPa, temperature: 115°C) of the spent lithium-ion battery electrolyte, the temperature is controlled at 60°C, and the obtained residual liquid is washed with ammonia water with a concentration of 1.5mol / L for several times. Crystallization obtains lithium fluoride;

[0077] Lithium fluoride, NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, manganese sulfate and water mix, obtain mixed solution, wherein the mol ratio of Ni, Co and Mn is 8:1:1, and the total molar ratio of the mol of Li and Ni, Co and Mn is 0.1:1, described mixed solution The total concentration of solute in medium is 1.8mol / L;

[0078]At 55°C and a stirring rate of 300r / min, add ammonia water with a concentration of 2mol / L to the mixed solution to keep the concentration of ammonia in the subsequent aging system at 10±0.5g / L, then use a concentration of 1.5mol / L NaOH solution to adjust the pH value to 11.5. After nickel, cobalt and manganese are completely deposited on th...

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Abstract

The invention relates to the technical field of electrode materials, in particular to a fluorinated high-nickel ternary material and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: carrying out vacuum rectification on a failure lithium ion battery electrolyte, and crystallizing the obtained residual liquid by adopting ammonia water to obtain lithium fluoride; mixing lithium fluoride, nickel sulfate, cobalt sulfate, manganese sulfate and water to obtain a mixed solution; mixing the mixed solution with a complexing agent, and conducting aging to obtain a precursor; and mixing the precursor with lithium hydroxide, and conducting calcining to obtain the fluorinated high-nickel ternary material. The fluorinated high-nickel ternary material prepared by the preparation method disclosed by the invention has good cycling stability and high-rate charge-discharge performance.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a high-nickel fluoride ternary material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used due to their excellent properties such as high voltage, high capacity, high cycle and good thermal stability. With the development of science and technology, lithium cobalt oxide is subject to its structural stability and price, and its position will be replaced by other materials in the near future. The layered nickel-cobalt-manganese ternary material has the advantages of high specific capacity, good safety performance and low production cost, and its status in the lithium battery industry is steadily rising. It is considered to be the most promising lithium battery cathode material to replace lithium cobalt oxide. However, with the rapid development of contemporary technology, people have higher and hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525H01M10/54
CPCC01G53/50C01G53/006H01M4/505H01M4/525H01M10/0525H01M10/54C01P2002/72C01P2004/03Y02W30/84Y02E60/10
Inventor 董振伟陈浩易贺迪张磊闫晓志王瑞庆
Owner 新乡天力锂能股份有限公司