A method for the preparation of ternary cathode materials for lithium-ion batteries by a hydrothermal-assisted co-precipitation strategy

A lithium-ion battery, hydrothermal assisted technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of decreased electrochemical performance of ternary cathode materials, insufficient stability of material structure, and easy collapse of layered structure. , to achieve the effect of improving electrochemical performance, improving structural stability, and reducing the degree of lithium-nickel mixing

Active Publication Date: 2022-04-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Although the ternary cathode material LiNi 1-x-y co x mn y o 2 Compared with other cathode materials, it has great advantages in terms of specific capacity, cycle stability, cost and environmental performance, but ternary cathode materials still have shortcomings
Among them, the mixed arrangement of lithium and nickel is the most worthy of attention. Since the atomic radii of lithium atoms and nickel atoms are relatively close, the material is prone to position exchange during the preparation process and cycle process, resulting in the mixed arrangement of lithium and nickel cations, especially when the nickel in the ternary cathode material The increase of the element content is more serious, resulting in a significant decrease in the electrochemical performance of the ternary cathode material.
After the charge-discharge cut-off voltage of the material is increased, due to the large amount of lithium ion intercalation, the stability of the material structure is insufficient, and the layered structure is easy to collapse.

Method used

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  • A method for the preparation of ternary cathode materials for lithium-ion batteries by a hydrothermal-assisted co-precipitation strategy
  • A method for the preparation of ternary cathode materials for lithium-ion batteries by a hydrothermal-assisted co-precipitation strategy
  • A method for the preparation of ternary cathode materials for lithium-ion batteries by a hydrothermal-assisted co-precipitation strategy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1. Preparation of lithium ion battery ternary cathode material LiNi by hydrothermal assisted co-precipitation strategy 0.8 co 0.1 mn 0.1 o2

[0030] (1) According to the stoichiometric ratio Ni:Co:Mn=8:1:1, weigh nickel sulfate, cobalt sulfate and manganese sulfate, and add them into deionized water to obtain a total concentration of 2mol L -1 mixed salt solution;

[0031] Mix the above mixed salt solution with 6mol·L -1 NaOH, 3mol L -1 NH 3 ·H 2 O was fed into a continuously stirred 1L reactor in parallel by a peristaltic pump for co-precipitation reaction, the stirring rate was set at 1000rpm, the reaction control pH value was 10.5, the ammonia-salt ratio was 3:4, and the temperature was 60°C, and the reaction was continued for 4h , get Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor suspension;

[0032] (2) the prepared Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor suspension was placed in a hydrothermal reaction kettle, and crystallized at 180 °C for 40 h;...

Embodiment 2

[0035] Example 2. Preparation of lithium ion battery ternary cathode material LiNi by hydrothermal assisted coprecipitation strategy 0.6 co 0.2 mn 0.2 o 2

[0036] (1) According to the stoichiometric ratio Ni:Co:Mn=6:2:2, weigh nickel sulfate, cobalt sulfate and manganese sulfate, add them into deionized water, and obtain a total concentration of 2mol L -1 mixed salt solution;

[0037] Mix the above mixed salt solution with 6mol·L -1 NaOH, 3mol L -1 NH 3 ·H 2 O was fed into a continuously stirred 1L reactor in parallel by a peristaltic pump for co-precipitation reaction, the stirring rate was set at 1000rpm, the reaction control pH value was 10.5, the ammonia-salt ratio was 3:4, and the temperature was 60°C, and the reaction was continued for 4h , get Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor suspension;

[0038] (2) the prepared Ni 0.6 co 0.2 mn 0.2 (OH) 2 The precursor suspension was placed in a hydrothermal reaction kettle, and crystallized at 180 °C for 40 h; ...

Embodiment 3

[0041] Example 3. Preparation of lithium-ion battery ternary cathode material LiNi by hydrothermal assisted co-precipitation strategy 0.5 co 0.2 mn 0.3 o 2

[0042] (1) According to the stoichiometric ratio Ni:Co:Mn=5:2:3, weigh nickel sulfate, cobalt sulfate and manganese sulfate, and add them into deionized water to obtain a total concentration of 2mol L -1 mixed salt solution;

[0043] Mix the above mixed salt solution with 6mol·L -1 NaOH, 3mol L -1 NH 3 ·H 2 O was fed into a continuously stirred 1L reactor in parallel by a peristaltic pump for co-precipitation reaction, the stirring rate was set at 1000rpm, the reaction control pH value was 10.5, the ammonia-salt ratio was 3:4, and the temperature was 60°C, and the reaction was continued for 4h , get Ni 0.5 co 0.2 mn 0.3 (OH) 2 Precursor suspension;

[0044] (2) the prepared Ni 0.5 co 0.2 mn 0.3 (OH) 2 The precursor suspension was placed in a hydrothermal reaction kettle, and crystallized at 180 °C for 40 ...

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Abstract

The invention discloses a method for preparing a lithium-ion battery ternary positive electrode material by a hydrothermal assisted co-precipitation strategy, which is to firstly prepare Ni by the hydroxide co-precipitation method. 1‑x‑y co x mn y (OH) 2 Precursor, x+y<1; then the precursor is subjected to hydrothermal crystallization treatment, and finally mixed with lithium and roasted to obtain the lithium-ion battery ternary cathode material LiNi 1‑x‑y co x mn y o 2 , x+y<1. The positive electrode material prepared by the invention has higher charge-discharge specific capacity and cycle stability, and the method of the invention has a significant effect on improving the electrochemical performance of the lithium-ion battery ternary positive electrode material.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of a lithium-ion battery ternary cathode material. Background technique [0002] With the rapid update of technologies such as portability, wearable electronic devices, new energy vehicles and grid energy storage, lithium-ion batteries with the advantages of high energy density, long cycle life, no memory effect, and environmental friendliness are promoting national industry and national economy. Development, mitigation of the global fuel crisis, and response to increasingly prominent environmental issues are playing an irreplaceable role, so higher requirements are placed on the energy density, cycle life, and safety performance of the mobile power it is loaded on. The development of new cathode materials with high specific capacity is the key to further improving the energy density of lithium-ion batteries. [0003] With α-NaFeO 2 Ternary C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525C01P2006/40C01P2004/03C01P2002/72Y02E60/10
Inventor 杨则恒吴兆国张卫新唐伟建
Owner HEFEI UNIV OF TECH
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