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Preparation method of in-situ doped and modified nickel cobalt manganese lithium oxide positive material

A nickel-cobalt-manganese-lithium oxide and in-situ doping technology, which is applied in the direction of positive electrodes, active material electrodes, battery electrodes, etc., can solve problems such as structural instability, battery cycle performance degradation, and limited improvement range, and achieve cycle performance improvement , saving cost and simplifying the preparation process

Inactive Publication Date: 2015-06-10
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of the positive electrode material becomes unstable under high voltage, which reduces the cycle performance of the battery.
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, by forming a stable surface layer. Protects its structure, but this only modifies the surface of the material and the improvement is limited

Method used

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  • Preparation method of in-situ doped and modified nickel cobalt manganese lithium oxide positive material
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  • Preparation method of in-situ doped and modified nickel cobalt manganese lithium oxide positive material

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Embodiment 1

[0031] 1) The soluble salts of nickel, cobalt, and manganese are configured into 10L 2.3mol / L nickel, cobalt, and manganese metal cation-containing mixed salt solutions (I) according to the molar ratio of nickel, cobalt, and manganese elements of 5:2:3 , configure 10L of 6mol / L NaOH solution and 2.2L of 12mol / L ammonia water and mix the two to obtain a mixed solution (II);

[0032] 2) Prepare 20 g of titanyl sulfate into 5 L of titanyl sulfate solution, add 40 ml of concentrated hydrochloric acid, stir, add 10 g of sodium lactate, and stir for 2 hours at a constant speed to obtain a mixed solution containing titanium metal (Ⅲ);

[0033] 3) Pump the mixed salt solution (I), NaOH and ammonia water mixed solution (II) and metal titanium-containing mixed solution (III) prepared in step 1) and step 2) into the reaction kettle at the same time, and control the NaOH and ammonia water The flow rate of the mixed solution makes the pH of the mixed reaction solution in the reactor be 11....

Embodiment 2

[0036] 1) the soluble salt of nickel, cobalt, manganese is configured into 10L 2mol / L nickel, cobalt, manganese metal cation mixed salt solution (I) according to the molar ratio of nickel, cobalt, manganese element is 5:2:3, Configure 12L of 4mol / L NaOH solution and 2L of 12mol / L ammonia water and mix the two to obtain a mixed solution (II);

[0037] 2) Prepare 43 g of aluminum nitrate as 4.5 L of aluminum nitrate solution, add 42 g of disodium ethylenediaminetetraacetate to it, and stir at a constant speed for 1 hour to obtain a mixed solution (III) containing metal aluminum;

[0038] 3) Pump the mixed salt solution (I), the mixed solution of NaOH and ammonia water (II) and the mixed solution containing metal aluminum (III) prepared in step 1) and step 2) into the reaction kettle at the same time, and control the concentration of NaOH and ammonia water. The flow rate of the mixed solution makes the pH of the mixed reaction solution in the reactor be 11.5, the stirring speed o...

Embodiment 3

[0041] 1) the soluble salt of nickel, cobalt, manganese is configured into 10L 2mol / L nickel, cobalt, manganese metal cation mixed salt solution (I) according to the molar ratio of nickel, cobalt, manganese element is 5:2:3, Configure 26L of 2mol / L NaOH solution and 2.5L of 10mol / L ammonia water and mix the two to obtain a mixed solution (II);

[0042] 2) 7g of magnesium nitrate and 17g of aluminum nitrate are configured as a mixed solution of 4L of magnesium nitrate and aluminum nitrate, 26g of disodium edetate is added thereto, and stirred at a constant speed for 0.5h to obtain a mixed solution containing metal magnesium and aluminum (Ⅲ );

[0043] 3) Pump the mixed salt solution (I), the mixed solution of NaOH and ammonia water (II) and the mixed solution (III) containing metal magnesium and aluminum into the reaction kettle at the same time, and control the NaOH and The flow rate of the ammonia water mixed solution makes the pH of the mixed reaction solution in the reacto...

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Abstract

The invention discloses a preparation method of an in-situ doped and modified nickel cobalt manganese lithium oxide positive material. The preparation method of the in-situ doped and modified nickel cobalt manganese lithium oxide positive material is characterized by introducing metal elements in the process of preparing a nickel cobalt manganese precursor to stabilize the structure and implementing atom-scale mixing of doped elements and main elements in the process of preparing the precursor. Compared with the solid phase surface doping, the method can be used for stabilizing the material structure as a whole, so that the sintered positive material is relatively high in stability under the high voltage, thereby working under the relatively high voltage; the battery capacity is greatly improved; meanwhile, the cycle performance is greatly improved; by virtue of the preparation method of the positive material, a process of producing the precursor and a process of doping in the later period are integrated, so that the preparation process is simplified; the cost is saved; the raw materials are bulk chemical products; the industrialization is liable to implement.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a method for preparing an in-situ doped modified nickel oxide cobalt manganese lithium positive electrode material. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long cycle life, no memory effect, small self-discharge and environmental friendliness, and have been widely used in small electronic products and electric vehicles and other equipment. The performance of lithium-ion batteries mainly depends on the performance of the cathode material. Therefore, the development of cathode materials with high energy density and stable structure has become the focus of attention. [0003] Nickel-cobalt-manganese ternary cathode material is one of the research hotspots of a new generation of lithium battery cathode materials. This type of material combines LiNiO 2 、LiCoO 2 , ...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 任崇徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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