Preparation method of ternary precursor with bulk phase doped with rare earth elements and positive electrode material of ternary precursor

A technology of rare earth elements and positive electrode materials, applied in chemical instruments and methods, electrical components, battery electrodes, etc., can solve the problems of poor element modification performance, poor mixing uniformity, and affecting lithium source embedding, etc. Improved discharge and DC internal resistance, less cracking, good electrochemical cycle performance and structural stability

Active Publication Date: 2020-04-17
浙江尚特新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this sintering method is easy to affect the intercalation of lithium source, and the mixing uniformity of this method is poor, diffusion can only occur on the surface layer, and the effect of element modification performance is poor.

Method used

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  • Preparation method of ternary precursor with bulk phase doped with rare earth elements and positive electrode material of ternary precursor
  • Preparation method of ternary precursor with bulk phase doped with rare earth elements and positive electrode material of ternary precursor
  • Preparation method of ternary precursor with bulk phase doped with rare earth elements and positive electrode material of ternary precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1, configure the nickel-cobalt-manganese salt solution: weigh NiSO according to the stoichiometric ratio 4 ·6H 2 O, MnSO 4 ·H 2 O, CoSO 4 ·7H 2 O and Tb(NO 3 ) 3 ·6H 2 O solid powder, dissolve it into 20L of deionized water, weigh mol(Ni):mol(Mn):mol(Co):mol(Tb)=0.83:0.115:0.05:0.005, and call the salt solution A solution;

[0035] Step 2, the complexing agent NaOH is prepared, the preparation concentration is 5mol / L, the preparation total volume is 15L, and this solution is called B solution.

[0036] Step 3, prepare the bottom solution (ammonia water), the concentration is 6mol / L, the preparation volume is 5L, this solution is called C solution.

[0037] Step 4, after the above-mentioned powders are completely dissolved in deionized water to form an unsaturated solution, take 2L of solution C and inject it into the reactor as the bottom liquid, and then connect the containers containing solution A, solution B and solution C to the self-priming pump of t...

Embodiment 2

[0047] Step 1, configure the nickel-cobalt-manganese salt solution: weigh NiSO according to the stoichiometric ratio 4 ·6H 2 O, MnSO 4 ·H 2 O, CoSO 4 ·7H 2 O and Eu(NO 3 ) 3 ·6H 2 O solid powder, dissolve it into 20L of deionized water, weigh mol(Ni):mol(Mn):mol(Co):mol(Eu)=0.59:0.17:0.17:0.07, and call the salt solution A solution;

[0048] Step 2, the complexing agent NaOH is prepared, the preparation concentration is 8mol / L, the preparation total volume is 10L, and this solution is called B solution.

[0049] Step 3, preparing a bottom solution (aqueous ammonia) with a concentration of 10 mol / L and a volume of 4 L. This solution is called C solution.

[0050] Step 4, after the above-mentioned powders are completely dissolved in deionized water to form an unsaturated solution, take 2L of solution C and inject it into the reactor as the bottom liquid, and then connect the containers containing solution A, solution B and solution C to the self-priming pump of the rea...

Embodiment 3

[0057] Step 1, configure the nickel-cobalt-manganese salt solution: weigh NiSO according to the stoichiometric ratio 4 ·6H 2 O, MnSO 4 ·H 2 O, CoSO 4 ·7H 2 O and Eu(NO 3 ) 3 ·6H 2 O solid powder, put it into 20L deionized water, weigh mol(Ni):mol(Mn):mol(Co):mol(La)=0.5:0.2:0.22:0.08, and call the salt solution A solution;

[0058] Step 2, the complexing agent NaOH is prepared, the preparation concentration is 3mol / L, the preparation total volume is 20L, and this solution is called B solution.

[0059] Step 3, prepare the bottom solution (ammonia water), the concentration is 5mol / L, the preparation volume is 10L, this solution is called C solution.

[0060] Step 4, after the above-mentioned powders are completely dissolved in deionized water to form an unsaturated solution, take 5L of solution C and inject it into the reactor as the bottom liquid, and then connect the containers containing solution A, solution B and solution C to the self-priming pump of the reactor,...

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Abstract

The invention provides a preparation method of a ternary precursor with the bulk phase doped with rare earth elements and a positive electrode material of the ternary precursor, and belongs to the field of lithium ion battery positive electrode materials. The preparation method is suitable for industrial mass production. The preparation method comprises the following steps: preparing a nickel-cobalt-manganese rare earth salt solution, an alkaline solution and a base solution, injecting the solutions into a reaction kettle at a certain rate, carrying out a coprecipitation reaction, regulating parameters in real time, monitoring the growth condition of particles, and carrying out suction filtration and drying to obtain the precursor NixCoyMnzREk(OH)2; and mixing the prepared precursor with lithium hydroxide, carrying out high-temperature sintering, crushing the sintered material by adopting a coarse crushing and fine crushing process, and carrying out particle size grading and magnetic foreign matter removal by virtue of a screening and iron removing machine so as to complete the preparation of the bulk-phase doped ternary positive electrode material. The rare earth La<3+>/Tb< 3+>/Eu<3+> element has a specific outer layer electronic configuration, and can be used for doping crystal lattices of NiCoMn(OH)2 to improve the electronic conductivity of the material and inhibit cation mixed arrangement in the crystal lattices, and Tb-O bonds are stronger than Ni-O and Mn-O bonds in energy, so that the doped material has good electrochemical cycle performance and structural stability.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a ternary precursor doped with rare earth elements in bulk and a preparation method for the positive electrode material thereof. Background technique [0002] At present, the lithium-ion battery cathode materials that have been mass-produced can be roughly divided into three categories according to their structures: the first category is lithium metal oxide LiMO with a hexagonal layered structure. 2 (M=Ni, Co, Mn), belonging to the (Rm) space group, and its representative materials are lithium cobaltate (LiCoO 2 ), lithium nickel cobalt manganese oxide (LiNi x co y mn z o 2 , X+Y+Z=1), lithium nickel cobalt aluminate (LiNi x co y Al z o 2 ,X+Y+Z=1); the second type is spinel structure materials with Fdm space group, and its representative materials are LiMn 2 o 4 ; The third type of material is a compound with a polyanion structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G53/04H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01G53/04C01G53/70H01M4/505H01M4/525H01M4/485H01M10/0525C01P2004/03C01P2006/40C01P2004/61Y02E60/10
Inventor 周伟杰张茴
Owner 浙江尚特新能源科技有限公司
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