Ternary lithium ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing the difficulty and cost of material storage, decreasing cycle performance and safety performance, and low efficiency of initial charge and discharge, and achieving shortened The effect of charging and discharging time, improving electrochemical performance and reducing charge transfer resistance

Inactive Publication Date: 2018-09-18
BEIJING TUNGHSU CARBON ADVANCED MATERIALS TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nickel-cobalt-manganese ternary materials, especially high-nickel materials, also have their performance defects. On the one hand, high-nickel materials can absorb water, and they are easily mixed with H in the air when placed in the air. 2 O.CO 2 Irreversible reactions occur, which increases the difficulty and cost of material storage; on the other hand, the material's first charge and discharge efficiency is low, and it is easy to react with the electrolyte in the subsequent process of lithium deintercalation, resulting in structural changes, cycle performance and safety performance decline; In addition, the electrochemical performance at high rates also needs to be improved.

Method used

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  • Ternary lithium ion battery positive electrode material and preparation method thereof
  • Ternary lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0027] A kind of preparation method of ternary lithium ion battery cathode material that one embodiment of the present invention proposes, it comprises:

[0028] Graphene is mixed with an organic solvent to obtain a graphene slurry;

[0029] Mixing and ball milling the graphene slurry with metal compounds and organic solvents, adding ternary materials, and continuing ball milling to obtain a mixed slurry;

[0030] Suction filter or rotary evaporate the mixed slurry, and dry at 100-130°C for 12-36 hours to obtain a mixed powder;

[0031] The mixed powder is calcined in an inert gas atmosphere to obtain a positive electrode material for a ternary lithium ion battery.

[0032] Preferably, the organic solvent is at least one of N-methylpyrrolidone, ethanol, acetone and tetrahydrofuran.

[0033] Preferably, the metal compound is aluminum hydroxide and / or magnesium hydroxide.

[0034] Preferably, the rotating speed of the ball mill is 250r / min, the ball milling time is 20-240min,...

Embodiment 1

[0041] A kind of preparation method of ternary lithium ion battery cathode material that one embodiment of the present invention proposes, it comprises:

[0042] Graphene is mixed with N-methylpyrrolidone to obtain graphene slurry;

[0043] 0.061g Al(OH) 3 Add to 30.26g, 2wt% graphene slurry, and add 50g N-methylpyrrolidone at the same time to reduce the viscosity; after mixing, ball mill in a ball mill for 50min at a speed of 300r / min, changing the direction of rotation every 5min ; join LiNi 0.5 co 0.2 mn 0.3 o 2Powder 50g, then continue ball milling for 90min, the rotating speed is 300r / min, to obtain mixed slurry;

[0044] The mixed slurry was subjected to a rotary evaporation operation in a rotary evaporator to evaporate the solvent N-methylpyrrolidone, and then placed in a vacuum drying oven for vacuum drying for 24 hours at a drying temperature of 120°C to obtain a mixed powder;

[0045] The mixed powder was calcined at 850 °C for 6 h in an inert gas atmosphere in...

Embodiment 2

[0050] A kind of preparation method of ternary lithium ion battery cathode material that one embodiment of the present invention proposes, it comprises:

[0051] Graphene is mixed with N-methylpyrrolidone to obtain graphene slurry;

[0052] 0.015g Mg(OH) 2 Add to 26.85g, 3wt% graphene slurry, and add 46.78g N-methylpyrrolidone at the same time to reduce the viscosity; after mixing, ball mill in a ball mill for 50min at a speed of 300r / min, changing the rotation every 5min Orientation; add LiNi 0.6 co 0.2 mn 0.2 o 2 Powder 50g, then continue ball milling for 90min, the rotating speed is 300r / min, to obtain mixed slurry;

[0053] The mixed slurry was subjected to a rotary evaporation operation in a rotary evaporator to evaporate the solvent N-methylpyrrolidone, and then placed in a vacuum drying oven for vacuum drying for 24 hours at a drying temperature of 120°C to obtain a mixed powder;

[0054] The mixed powder was calcined at 700 °C for 5 h in an inert gas atmosphere i...

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Abstract

The invention relates to a ternary lithium ion battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: mixing graphene with an organic solvent to obtain a graphene slurry; and mixing and ball-milling the graphene slurry, a metal compound and the organic solvent, and adding a ternary material to obtain a mixed slurry; performing suction filtration or rotary evaporation on the mixed slurry, and drying the obtained mixture to obtain a mixed powder; and calcining the mixed powder in an inert gas atmosphere to obtain the ternary lithium ion battery positive electrode material. A layer of a metal oxide and graphene composite material is uniformly adhered to the surface of a ternary material in order to form a core-shell structure, so the stability of the material structure in the lithium deintercalating process is enhanced; and the graphene is adhered to gaps between the surface of the material and material particles, so theconductivity is improved. The ternary lithium ion battery positive electrode material has the advantages of short charging time, excellent rate performance and excellent cycle life, the preparation method is simple and is easy to operate, and the positive electrode material is particularly suitable for the field of power batteries.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion battery materials, in particular to a ternary lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the urgent demand of new energy electric vehicle power batteries for high battery life, fast charging and discharging capabilities, and cost reduction, ternary batteries have become a hot spot for people to pay attention to. The nickel-cobalt-manganese ternary cathode material also overcomes the capacity of lithium iron phosphate Too low, high cost of lithium cobalt oxide batteries, and poor structural stability of lithium manganese oxide batteries have become mainstream cathode materials in the market. The chemical formula of nickel-cobalt-manganese ternary cathode material is LiNi x co y mn (1-x-y) o 2 , the electrochemical performance of the material is closely related to the content of Ni, Co, and Mn. Ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/583H01M4/62H01M10/0525C01B32/20
CPCC01B32/20H01M4/362H01M4/505H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李青赵菲菲李赫然王忠辉
Owner BEIJING TUNGHSU CARBON ADVANCED MATERIALS TECH CO LTD
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