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Method for preparing doped and modified nickel-cobalt lithium aluminate anode materials

A technology of lithium nickel cobalt aluminate and cathode material, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as limited improvement range, and achieve the effects of inhibiting migration, reducing residual alkali, and stabilizing structure

Active Publication Date: 2017-02-15
JINGMEN GEM NEW MATERIAL
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Problems solved by technology

At present, most domestic cathode material manufacturers use the precursors of upstream enterprises as raw materials to prepare cathode materials, and the element doping modification in the later stage is also carried out on the basis of the prepared precursors, and the doping elements enter through sintering Precursor particles, but this only modifies the surface of the material, and the improvement is limited

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  • Method for preparing doped and modified nickel-cobalt lithium aluminate anode materials
  • Method for preparing doped and modified nickel-cobalt lithium aluminate anode materials

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preparation example Construction

[0025] The invention provides a method for preparing a doped modified nickel-cobalt lithium aluminate positive electrode material, comprising:

[0026] (1) preparing the first mixed solution containing nickel salt and cobalt salt, the mol ratio of the nickel ion in the nickel salt and the cobalt ion in the cobalt salt is 0.80:0.15;

[0027] (2) Preparation of the second mixed solution containing aluminum salt, complexing agent and compound containing doping metal elements; said doping metal elements include at least one of titanium, zirconium and magnesium; said doping metal elements and The mass ratio of the aluminum element in the aluminum salt is 0.068-0.405:1;

[0028] (3) The first mixed solution, the second mixed solution, lye and ammonia solution are added into the reactor in parallel flow, and in the reactor, the molar ratios of the three metal ions of nickel, cobalt and aluminum are: 0.80:0.15:0.05, react at a temperature of 50°C-80°C for 36h-64h, after the reaction,...

Embodiment 1

[0058] A method for preparing a doped modified nickel-cobalt lithium aluminate cathode material, comprising:

[0059] (1) Nickel sulfate and cobalt sulfate are prepared into the first mixed solution a in the ratio of 8.0:1.5 by nickel ion and cobalt ion mol ratio, and in the first mixed solution, the total concentration of nickel and cobalt two kinds of metal ions is 100g / L; then prepare respectively the NaOH solution b with a concentration of 6mol / L and the ammonia solution c with a concentration of 10mol / L;

[0060] (2) Take 32kg of aluminum nitrate solid, 650g of titanyl sulfate, 1600g of magnesium nitrate, 1000g of lactic acid and 500ml of concentrated hydrochloric acid, stir at a constant speed for 2h, and prepare a 960L solution to obtain the second mixed solution d;

[0061] (3) A bottom liquid is set in the reaction kettle, the bottom liquid is an ammonia solution with an ammonia content of 8 g / L, the temperature of the ammonia solution is 60° C., and the pH value is ...

Embodiment 2

[0065] A method for preparing a doped modified nickel-cobalt lithium aluminate cathode material, comprising:

[0066] (1) Nickel chloride and cobalt chloride are formulated into the first mixed solution a in the ratio of 8.0:1.5 by nickel ion and cobalt ion mol ratio, and in the first mixed solution, the total concentration of nickel and cobalt two kinds of metal ions is 120g / L; Then prepare the NaOH solution b with a concentration of 8mol / L and the ammonia solution c with a concentration of 12mol / L;

[0067] (2) Take 29kg of aluminum nitrate solid, 500g of zirconium sulfate, 1000g of magnesium nitrate and 500g of disodium EDTA, stir at a constant speed for 2h, and prepare a 720L solution to obtain the second mixed solution d;

[0068] (3) The bottom liquid is set in the reactor, the bottom liquid is an ammonia solution with an ammonia content of 6g / L, the temperature of the ammonia solution is 50° C., and the pH value is 11.5. Add the above-prepared first mixed solution a, N...

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Abstract

The invention provides a method for preparing doped and modified nickel-cobalt lithium aluminate anode materials. The method includes (1), preparing first mixed liquor with nickel salt and cobalt salt; (2), preparing second mixed liquor with aluminum salt, complexing agents and compounds with doped metal elements; (3), combining flow of the first mixed liquor, flow of the second mixed liquor, flow of alkali liquor and flow of ammonia water solution with one another to obtain mixed flow, adding the mixed flow into a reaction kettle, carrying out reaction at the temperatures of 50-80 DEG C for 36-64 h, filtering, washing and drying obtained materials after the reaction is completely carried out so as to obtain doped and modified nickel-cobalt-aluminum precursors; (4), uniformly mixing the doped and modified nickel-cobalt-aluminum precursors and lithium source compounds with one another to obtain mixtures, heating the mixtures in oxygen atmosphere at the speed of 4-10 DEG C / min until the temperatures of the mixtures reach 700-800 DEG C, calcining the mixtures under heat-insulation conditions for 10-20 h, carrying out reaction, then naturally cooling obtained materials until the temperatures of the materials reach the room temperature and smashing and sieving the obtained materials to obtain the doped and modified nickel-cobalt lithium aluminate anode materials. A molar ratio of nickel metal ions to cobalt metal ions to aluminum metal ions in the reaction kettle is 0.80:0.15:0.05. The method has the advantage that the doped metal elements and host elements can be mixed with one another on atomic scales.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a method for preparing a doped modified nickel-cobalt lithium aluminate cathode material. Background technique [0002] Lithium-ion batteries have been widely used in devices such as small electronic products and electric vehicles, and their performance mainly depends on the cathode material. Therefore, the development of cathode materials with high energy density and stable structure has become the focus of attention. Among them, the reversible capacity of nickel cobalt lithium aluminate cathode material (NCA) is close to 200mAh / g, which is the material with the highest specific capacity among commercial cathode materials. [0003] However, the most fatal shortcoming of NCA material is that it is extremely easy to absorb water, and it will quickly react with water and CO when exposed to the air. 2 reaction, thereby forming LiOH and LiCO on the particle sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/525H01M10/0525Y02E60/10
Inventor 张云河许开华叶建
Owner JINGMEN GEM NEW MATERIAL
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