Doped monocrystal multi-component material for lithium ion batteries and preparation method of such doped monocrystal multi-component material

A lithium-ion battery and single-crystal-like technology, which is applied in the field of single-crystal-like multi-element cathode materials and their preparation, can solve the problems of low specific capacity of lithium-ion batteries, prone to lithium precipitation, and low first discharge efficiency of cathode materials, etc.

Inactive Publication Date: 2017-05-31
烟台卓能锂电池有限公司
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Problems solved by technology

Patent CN 105161714 A discloses "a calcium-doped lithium-ion battery ternary cathode material and its preparation method", which uses a solid-phase method and a high-temperature solid-phase sintering method to prepare a calcium-doped lithium-ion battery ternary cathode material; Patent CN 104201371 A discloses "a preparation method of nickel-cobalt-lithium manganese oxide composite positive electrode material", which strengthens the melting reaction between particles and improves the bulk density of the product through the addition of a binder; after high-temperature fusion, The binder remaining on the surface of the nickel-cobalt-lithium manganese oxide composite positive electrode material is used to block the side reaction between the material and the electrolyte; patent CN 104282901 A discloses "a nickel-cobalt-manganese ternary positive electrode material for high conductivity power battery Manufacturing method", the patent uses M metal doping to increase the migration speed of Li+ in the ternary lattice, and TCO gel coating improves the electron migration rate of the ternary cathode material and improves the surface characteristics of the ternary material; however

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  • Doped monocrystal multi-component material for lithium ion batteries and preparation method of such doped monocrystal multi-component material
  • Doped monocrystal multi-component material for lithium ion batteries and preparation method of such doped monocrystal multi-component material
  • Doped monocrystal multi-component material for lithium ion batteries and preparation method of such doped monocrystal multi-component material

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preparation example Construction

[0061] A method for preparing a doped lithium-ion battery-like single-crystal multi-element positive electrode material of the present invention comprises the following steps;

[0062] S1: Preparation of Ni by co-precipitation method x co y mn 1-x-y-z m z (OH) 2 Multicomponent composite material precursor

[0063] Mix nickel salt, cobalt salt, manganese salt, and M source salt according to the metal molar ratio of x:y:1-x-y-z:z to obtain mixed solution A. The concentration of solution A is 0.5-2.5mol / L. The solution A and the precipitating agent are added together into the reactor containing the complexing agent for reaction, the stirring speed is controlled at 500-800r / min, the pH is controlled at 10.5-14, the reaction time is 15-36 hours, and the reaction temperature is controlled at 40 -80°C, get precipitate B after reaction, age the precipitate B, the aging time is 10-30h, wash, wash with deionized water, the number of washes is 4-6 times, filter, wash again, the numb...

Embodiment 1

[0099] (1) Nickel salt, cobalt salt, manganese salt, and titanium salt are mixed according to the metal molar ratio of 0.75:0.1:0.1:0.05, and dissolved in deionized water to make a mixed salt solution with a concentration of 1mol / L. The mixed salt solution, 2mol / L precipitant NaOH solution and complexing agent NH 3 ·H 2 O solution three co-flow, join in the reactor that fills the NaOH solution that pH is 11.25 and be bottom liquid, control pH to keep 11.25 ± 0.05 all the time, stir and react at 50 ℃ for 24 hours (nitrogen is used as protective gas in the reaction process), The product slurry is obtained by overflowing, the product slurry is aged for 20h, and filtered to obtain the multi-component precursor intermediate product;

[0100] (2) Wash the above-mentioned intermediate product with 80°C deionized water 6 times to remove excess impurity ions, filter and dry at 80°C for 24 hours to obtain Ni 0.75 co 0.1 mn 0.1 Ti 0.05 (OH) 2 Multi-component precursors, the particl...

Embodiment 2

[0109] (1) Nickel salt, cobalt salt, manganese salt, zirconium salt and lithium source are carried out ball milling, and the rotating speed is 400r / min, and the time is 55min;

[0110] (2) Nickel salt, cobalt salt, manganese salt, and zirconium salt are mixed according to the ratio of metal molar ratio of 0.7:0.15:0.12:0.03, mixed with a vertical drum mixer, dissolved in deionized water to make a concentration of 2mol / L mixed salt solution. The mixed salt solution, 4mol / L precipitant NaOH solution and complexing agent NH 3 ·H 2 O solution three co-currents, join in the reactor that fills the NaOH solution that pH is 11.55 and be the bottom liquid, control pH to keep 11.55 ± 0.05 all the time, stir and react at 60 ℃ for 30 hours (nitrogen is used as protective gas in the reaction process), The product slurry is obtained by overflowing, the product slurry is aged for 28h, and filtered to obtain the multi-component precursor intermediate product;

[0111] (3) Wash the above-me...

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Abstract

The invention belongs to the technical field of anode materials for lithium ion batteries and particularly discloses a doped monocrystal multi-component material for lithium ion batteries and a preparation method of such doped monocrystal multi-component material. The doped monocrystal multi-component material and the preparation method thereof have the advantages that nickel-cobalt-manganese ternary materials are modified, and M-source metals are doped when a precursor is prepared to decrease the material sintering temperature and improve material tapping density, so that the mixed arrangement degree of Ni<2+> in a Li<+> layer is weakened obviously; through high-temperature sintering and tempering processes, the precursor of the multi-composite material, prepared through a coprecipitation method, is more stable in crystal structure, metal ions in the material are inhibited from dissolving through surface coating, side reaction between the metal ions and electrolyte is inhibited, and stability and electrochemical performance of an active material are further enhanced; a doped monocrystal multi-component material finished product is stable in crystal structure, high in safety and compaction density and excellent in rate capability and cycle performance, so that specific capacity and charge-discharge voltage of the material are further enhanced; the preparation method is small in doping quantity, simple to operate, easy to control, widely applicable and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a kind of single crystal multi-component positive electrode material and a preparation method thereof. Background technique [0002] With the increasing global energy shortage and environmental protection requirements, the development and promotion of electric vehicles has attracted more and more attention from governments around the world, and lithium-ion power batteries, as the core components of power systems, have also received more and more attention. The composition of lithium-ion batteries mainly includes positive electrodes, separators, electrolytes, negative electrodes, and shells. At present, the negative electrode materials mainly use graphite materials with relatively low potential and high capacity, and the price is relatively low. Therefore, the research on cathode materials is one of the key technologies fo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01G11/30H01G11/46H01G11/86
CPCH01G11/30H01G11/46H01G11/86H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 张伟周舟程洁王训才陈玉超崔云龙苏善金丁雪娇
Owner 烟台卓能锂电池有限公司
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