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Preparation method of high-safety ternary composite material

A composite material, high-safety technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as good safety performance and poor rate performance, and achieve the effect of maintaining safety, high compatibility, and improving safety performance.

Inactive Publication Date: 2017-08-11
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of current ternary materials such as good safety performance and poor rate performance, the present invention provides a preparation method of a ternary composite material with high safety performance, good cycle performance and high rate performance, and is applied to lithium ion battery

Method used

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  • Preparation method of high-safety ternary composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Depend on figure 1 Known, a kind of preparation method of high safety ternary composite material, by weight percentage, comprises the following steps:

[0020] 1. Preparation of mixed slurry:

[0021] First, add 15g of polyvinylidene fluoride to 500ml of trimethylhexyl bis(trifluoromethylsulfonyl)imide ionic liquid, after the dispersion is uniform, add 20g of Li 3 PMo 12 o 40 Porous metal lithium oxide compound, 20gLi 5 La 3 Ta 2 o 12 Inorganic lithium compound, after stirring evenly, add 100g LiNi 0.3 co 0.5 mn 0.2 o 2 Ternary materials, and through a high-speed disperser, LiNi coated with lithium compounds is obtained 0.3 co 0.5 mn 0.2 o 2 Ternary composite material A;

[0022] 2. Sintering and carbonization:

[0023] LiNi 0.3 co 0.5 mn 0.2 o 2 The ternary composite material A was transferred to a tube furnace, and in an inert atmosphere, the temperature was raised to 250°C at a heating rate of 5°C / min, and kept for 2 hours, and then the temperatur...

Embodiment 2

[0027] 1. Preparation of mixed slurry:

[0028] First, 10g of polyvinyl alcohol was added to 500ml of N-methyl-N-propylpiperidine bis(trifluoromethylsulfonyl)imide (PP13TFSI) ionic liquid, and after the dispersion was uniform, 10g of Li 3 PW 12 o 40 Porous metal lithium oxide compound, 10gLi 5 La 3 Nb 2 o 12 Inorganic lithium compound, after stirring evenly, add 100g LiNi 0.3 co 0.5 mn 0.2 o 2 Ternary materials, and through a high-speed disperser, LiNi coated with lithium compounds is obtained 0.3 co 0.5 mn 0.2 o 2 Ternary composite material A;

[0029] 2. Sintering and carbonization:

[0030] LiNi 0.3 co 0.5 mn0.2 o 2 The ternary composite material A was transferred to a tube furnace, and in an inert atmosphere, the temperature was raised to 200°C at a heating rate of 1.0°C / min, and kept for 3 hours, and then the temperature was raised to 600°C at a heating rate of 1.0°C / min, and kept warm 3h, then naturally cool down to room temperature to obtain the ternar...

Embodiment 3

[0034] 1. Preparation of mixed slurry:

[0035] First, add 20g of polymethyl acrylate binder to 500ml of trimethylhexyl bis(trifluoromethylsulfonyl)imide ionic liquid, after the dispersion is uniform, add 30g of Li 4 SiW 12 o 40 Porous metal lithium oxide, 30g LiAlO 2 , after stirring evenly, add 100g LiNi 0.3 co 0.5 mn 0.2 o 2 Ternary materials, and through a high-speed disperser, LiNi coated with lithium compounds is obtained 0.3 co 0.5 mn 0.2 o 2 Ternary composite material A;

[0036] 2. Sintering and carbonization:

[0037] LiNi 0.3 co 0.5 mn 0.2 o 2 The ternary composite material A was transferred to a tube furnace, and in an inert atmosphere, the temperature was raised to 300°C at a heating rate of 10°C / min, and kept for 1 hour, and then the temperature was raised to 900°C at a heating rate of 10°C / min, and kept 1h, then naturally cooled to room temperature to obtain LiNi 0.3 co 0.5 mn 0.2 o 2 Ternary composite material B;

[0038] 3. Electrochemical...

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Abstract

The invention belongs to the field of lithium ion battery material preparation, and specifically relates to a preparation method of a high-safety ternary composite material. The preparation process of the preparation method comprises the following steps: firstly mixing a porous metal lithium oxygen compound with a lithium compound to form a solution, adding a ternary material, dispersing uniformly at a high speed to obtain a mixed sizing agent, and then preparing a ternary composite material through sintering, carbonization and an electrochemical lithium supplementing process thereof. The prepared composite material is combined with negative ions of the porous metal lithium oxygen compound by using lithium ions, in the charging and discharging process of batteries, the lithium ions of the porous metal lithium oxygen compound can exchange lithium ions in an electrolyte constantly, so that the safety of the ternary material is maintained, and the transmission rate of the lithium ions is also improved; and moreover, the electrical conductivity of the lithium ions in the lithium compound is high and the lithium ions are coated on the surface of the ternary material so that the probability of occurrence of secondary reaction is reduced, and the safety performance and rate capability are improved.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion battery materials, in particular to a high-safety ternary composite material and a preparation method thereof. Background technique [0002] Ternary materials are widely used in lithium-ion batteries due to their advantages such as high energy density, and are also used in pure electric vehicles, energy storage and other fields. However, the cycle stability and thermal stability of nickel-cobalt-manganese ternary materials are poor, which restricts their wide application. The traditional method to improve the electrochemical stability and thermal stability of ternary materials used in lithium-ion batteries is surface modification, such as surface coating of metal oxides, fluorides, metal phosphates, etc., these coatings can improve the activity The interface stability between the substance and the electrolyte prevents the generation of hydrogen fluoride during charge and discharge. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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