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Preparation method of lithium ion battery positive electrode composite material

A lithium-ion battery and composite material technology, applied in the field of lithium-ion battery material preparation, can solve the problems of material surface structure damage, transition metal dissolution, electrolyte decomposition, etc., to achieve uniform coating, improved surface stability, and electrochemical performance. Improved effect

Inactive Publication Date: 2018-09-04
CENT SOUTH UNIV
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Problems solved by technology

However, the currently used high-nickel ternary cathode materials still have significant problems, such as safety performance, high-voltage cycle stability, storage performance, etc.
[0003] In addition, during the charge-discharge cycle of lithium-ion batteries, the tetravalent nickel ions in the high-nickel cathode material have very strong catalytic oxidation activity, which can easily cause the decomposition of the electrolyte, resulting in damage to the surface structure of the material, dissolution of transition metals, and increased polarization. A series of problems; especially in the high-temperature cycle process, the lithium-ion high-nickel cathode material and the electrolyte intensify the side reaction, the dissolution of transition metals is obvious, and the content of the electrochemically active cathode material decreases

Method used

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  • Preparation method of lithium ion battery positive electrode composite material
  • Preparation method of lithium ion battery positive electrode composite material
  • Preparation method of lithium ion battery positive electrode composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Dissolve 0.0088g (0.1wt%) of ammonium metatungstate in 200ml of ethanol aqueous solution at 30°C (1:1 mix of absolute ethanol and water by volume), then add 0.1g of PVP (polyvinylpyrrolidone), at a constant temperature of 30°C With constant stirring, add 10g Ni to it 0.8 co 0.1 mn 0.1 (OH) 2 Material and keep the temperature constant and stir for 2h. After fully stirring, evaporate the solvent in an 80°C oil bath, transfer to a constant temperature drying oven at 80°C and dry overnight to make the tungsten source crystallize or adsorb on the surface of the positive electrode material to obtain a precursor. Lithium mixing is then carried out (lithium mixing is dry mixing of lithium salt and precursor in an agate mortar), lithium hydroxide is used for lithium salt, and the amount of lithium hydroxide is 2.584g. After the lithium mixing is completed, the obtained material is calcined, the sintering temperature is 800° C., the sintering time is 15 hours, and the claddin...

Embodiment 2

[0044] Dissolve 0.103g of tungsten trichloride in 200ml of ethanol aqueous solution (mixture of anhydrous ethanol and water in a volume ratio of 1:1), then add 0.1g of PVP, keep stirring at a constant temperature of 30 degrees for 2h, and use lithium tungstate as 1wt % calculation, add 10gNi to it 0.5 co 0.2 mn 0.3 (OH) 2 material and keep the temperature constant. After fully stirring, the solvent was evaporated to dryness in an oil bath at 85°C, and transferred to a constant temperature drying oven at 85°C to dry overnight. Carry out mixed lithium afterwards (mixed lithium is to carry out the dry mixing of lithium salt and precursor in agate mortar) lithium salt uses lithium hydroxide, consumption is 2.494g, mixed lithium amount is Ni 0.5 co 0.2 mn 0.3 (OH) 2 1.01 times the molar amount of the metal ions contained in it, and then calcined, the sintering temperature is 900°C, the sintering time is 16 hours, and the cladding material is obtained by natural cooling. XRD...

Embodiment 3

[0046] Dissolve 0.641g of tungsten pentachloride in 200ml of ethanol aqueous solution (mixture of absolute ethanol and water in a volume ratio of 1:1), then add 0.1g of PVP, keep stirring at a constant temperature of 30 degrees for 2 hours, and use lithium tungstate coating as 5wt % Calculation Add 10gNi to it 0.6 co 0.2 mn 0.2 (OH) 2 material and keep the temperature constant. Evaporate the solvent in a 90°C oil bath, transfer to a constant temperature drying oven at 90°C to dry overnight, and then mix lithium (mixing lithium is dry mixing of lithium salt and precursor in an agate mortar) for lithium salt use Lithium carbonate, the dosage is 4.191g, the amount of mixed lithium is Ni 0.6 co 0.2 mn 0.2 (OH) 2 1.1 times the molar amount of the metal ions contained in it, and then calcined, the sintering temperature is 850°C, the treatment time is 18 hours, and the coating material is obtained by natural cooling. XRD shows no lithium tungstate heterophase peak.

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Abstract

The invention provides a preparation method of lithium ion battery positive electrode composite material, which comprises the following steps of: 1) dissolving tungsten source in a solvent, and addingPVP to disperse to form a mixed solution; 2) adding high nickel anode material into the mixed solution, and heating and evaporating the solvent after constant temperature stirring; 3) drying the material obtained in the step 2) and then performing dry mixing with the lithium salt; 4) sintering the dry-mixed material under the aerobic condition to obtain the lithium tungstate-coated high-nickel anode material. The coated layer of the obtained material is good in uniformity, and the coated lithium tungstate helps to improve the electrochemical performance of the high-nickel anode material, in particular to the cycling stability in the high-temperature environment.

Description

technical field [0001] The present invention relates to the technical field of preparation of lithium-ion battery materials, in particular to a preparation method of a lithium-ion battery positive electrode composite material, especially a lithium-ion battery lithium tungstate-coated high-nickel positive electrode composite material. Preparation. Background technique [0002] Cathode material is the most important part of lithium-ion battery, because its specific capacity is lower than that of negative electrode material, which is the key factor limiting the energy density of lithium-ion battery. In the development of lithium-ion batteries, cathode materials have become the focus of researchers. At present, with the development of science and technology, mobile devices have increasingly higher requirements on the performance of batteries in all aspects, and the cathode materials of lithium-ion batteries are developing in the direction of high voltage and high capacity. In ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 胡启阳王春虎颜果春彭文杰王志兴郭华军李新海王接喜
Owner CENT SOUTH UNIV
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