Method for doping anion in positive electrode material of lithium ion battery, positive electrode and battery

A lithium-ion battery and cathode material technology, applied in the field of anion doping, can solve the problems of no anion doping method, etc., and achieve the effect of low equipment price, simple process, and simple and easy operation

Active Publication Date: 2022-05-24
香港城市大学深圳研究院
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, anion doping is a method that can modify nickel-rich materials on a large scale, but so far there is no anion doping method that can be industrialized.

Method used

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  • Method for doping anion in positive electrode material of lithium ion battery, positive electrode and battery
  • Method for doping anion in positive electrode material of lithium ion battery, positive electrode and battery
  • Method for doping anion in positive electrode material of lithium ion battery, positive electrode and battery

Examples

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Embodiment 1

[0037] This embodiment provides a kind of Cl - The preparation method of the doped nickel-rich cathode material, the technological process is as follows figure 1 shown, including the following steps:

[0038] (1) 2M Ni(NO) with Ni:Co:Mn molar ratio of 65:30:5 was configured 3 ) 2 , Co(NO 3 ) 2 , MnCl 2 Mixed solution, configure 4M NaOH solution as precipitant, configure 0.2M ammonia water as complexing agent;

[0039] (2) 100mL of deionized water was added to the reaction kettle as the bottom liquid, mixed solution, NaOH solution, and ammonia water were added to the reaction kettle at the same rate (feeding at a rate of 10mL / h for 8h) at the same time, and nitrogen was passed through the process for protection, The temperature was 60°C, the pH was 7.5, and the reaction was carried out for 8 hours. After the reaction, the product was washed, filtered and dried to obtain the precursor;

[0040] (3) putting the precursor obtained in step (2) into a tube furnace for anneali...

Embodiment 2

[0045] The difference between this embodiment and Embodiment 1 is that the annealing temperature in step (3) is 500°C.

[0046] The Cl of the nickel-rich cathode material obtained in this example - The proportion of ions is less than 1% (such as image 3 shown), indicating that the doping content can be changed by adjusting the annealing process of step (3).

Embodiment 3

[0048] The difference between this embodiment and embodiment 1 is that: step (1) adopts 1M Ni(C 2 H 5 O 2 ) 2 , Co(C 2 H 5 O 2 ) 2 , MnCl 2 mixture.

[0049] This example obtained 2.03 at. % of Cl - Doped nickel-rich cathode materials (such as Figure 4 shown).

[0050] The above-mentioned embodiment is based on Cl - For example, a homogeneous phase doping was successfully achieved, and other halide ions were similar, and the doping of other anions could be achieved by replacing chlorides with fluorides or nitrates, phosphates, and oxalates.

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Abstract

The invention provides a method for doping anions in the cathode material of a lithium ion battery, the cathode and the battery. The method includes: configuring a mixed solution containing nickel salt, cobalt salt, and manganese salt; configuring NaOH solution; configuring ammonia solution; adding the mixed solution, NaOH solution and ammonia solution to the water, and under the protection of an inert atmosphere, the Reaction for 5h-15h under the condition of pH value 7.5-9, after washing, suction filtration and drying, the precursor is obtained; the precursor is annealed for 2h-6h in an oxygen atmosphere at 200°C-400°C to obtain an oxide; The oxide is ground and mixed with the lithium salt, and sintered in two stages under an oxygen atmosphere to obtain an anion-doped lithium-ion battery cathode material. The method of the invention can realize homogeneous and single doping of anions without other doping sources and treatment processes, has low cost, simple and easy operation, non-toxicity, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for doping anions into a positive electrode material of a lithium ion battery, and belongs to the technical field of lithium ion batteries. Background technique [0002] As people pay more and more attention to the living environment, new energy vehicles have attracted widespread attention due to their environmental friendliness and sustainable development. However, the cost of fuel cell vehicles is too high and cannot be afforded by the general public economically. In order to solve this problem, it is necessary to develop cheap, less polluting, safe and reliable energy storage technology. [0003] Rechargeable batteries have been extensively studied in the past decade and have been used in many fields. Among them, lithium-ion batteries are the best choice for electric vehicle power batteries due to their advantages in power density and energy density. However, the energy density of current commercial batteries canno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/44H01M4/525H01M4/505H01M10/0525H01M2004/028C01P2002/72Y02E60/10
Inventor 刘奇朱和康
Owner 香港城市大学深圳研究院
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