Doped ternary positive electrode material and preparation method and application thereof

A positive electrode material and doped technology, applied in the field of doped ternary positive electrode materials and their preparation, can solve the problem of insufficient material structure stability, insufficient cycle performance and safety of lithium ion batteries, and poor ternary positive electrode materials. and other problems, to achieve the effect of being conducive to rapid transmission, improved structural stability, and improved structural stability

Active Publication Date: 2021-11-19
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a doped ternary positive electrode material and its preparation method and application, so as to solve the poor effect of doping the ternary positive electrode material in the prior art and the insufficient stability of the material structure, which easily leads to Insufficient Cycle Performance and Safety of Lithium-ion Batteries

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  • Doped ternary positive electrode material and preparation method and application thereof

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[0027] As described in the background technology section, the effect of doping ternary cathode materials in the prior art is not good, and the structural stability of the material is insufficient, which easily leads to insufficient cycle performance and safety of lithium-ion batteries. In order to solve the above problems, the present invention provides a method for preparing a doped ternary positive electrode material, which includes the following steps: Step S1, after mixing the displacement ion body, the organic displacement agent, and the solvent, conduct a dissolution heat reaction to obtain a dissolved Thermal reaction solution; wherein, the replacement ion body is M(OH) n , M is selected from the second main group element, the third main group element, the fourth main group element, the third subgroup element, the fourth subgroup element, the sixth subgroup element, the seventh subgroup element or the eighth group element , n is an integer from 2 to 4; the organic displ...

Embodiment 1

[0042] (1) Add magnesium hydroxide to a polyvinylpyrrolidone aqueous solution with a concentration of 10g / L, the mass ratio of magnesium hydroxide to polyvinylpyrrolidone is 100:1, stir for 10min until the magnesium hydroxide is uniformly dissolved, and the stirring speed is 300rpm.

[0043] (2) Add the dissolved solution into the reaction kettle, put the reaction kettle into an oven for heat-dissolution reaction, the hydrothermal temperature is 200° C., and the hydrothermal time is 15 hours to obtain the heat-dissolve reaction solution.

[0044] (3) The ternary precursor Ni 0.83 mn 0.11 co 0.06 (OH) 2 Add it into the heat-dissolving reaction solution, stir evenly at 450rpm, record the total number of moles of nickel, cobalt, and manganese atoms in the ternary precursor as N, and record the number of moles of magnesium atoms in the replacement ion magnesium hydroxide as N' , then N:N' is 100:1.

[0045] (4) Put the uniformly stirred solution into a freeze dryer for freeze-...

Embodiment 2

[0054](1) Add zirconium hydroxide to a polypyrrole aqueous solution with a concentration of 10g / L, the mass ratio of zirconium hydroxide to polypyrrole is 200:1, stir for a certain period of time until the magnesium hydroxide is uniformly dissolved, and the stirring speed is 300rpm.

[0055] (2) Add the dissolved solution into the reaction kettle, put the reaction kettle into an oven for heat-dissolution reaction, the hydrothermal temperature is 200° C., and the hydrothermal time is 15 hours to obtain the heat-dissolve reaction solution.

[0056] (3) The ternary precursor Ni 0.83 mn 0.11 co 0.06 (OH) 2 Join in the dissolving heat reaction solution, stir evenly at 450rpm, the total number of moles of nickel, cobalt, manganese atoms in the ternary precursor is recorded as N, and the number of moles of zirconium atoms in the replacement ion zirconium hydroxide is recorded as N', then N:N' is 200:3.

[0057] (4) Put the uniformly stirred solution into a lyophilizer for lyophil...

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Abstract

The invention provides a doped ternary positive electrode material and a preparation method and application thereof. The preparation method comprises the steps of S1, mixing a replacement plasma, an organic replacement agent and a solvent, and carrying out a dissolution thermal reaction to obtain a dissolution thermal reaction solution; S2, mixing and stirring the dissolved thermal reaction solution and nickel-cobalt-manganese hydroxide, and then freeze-drying to obtain a freeze-dried product; S3, grinding the freeze-dried product, and then mixing with lithium hydroxide to obtain a mixed material; and S4, calcining the mixed material to obtain the doped ternary positive electrode material. The doped ternary positive electrode material prepared by the method provided by the invention is stable in structure, has good cycle performance and safety when being applied to the lithium ion battery, and also has good rate capability.

Description

technical field [0001] The invention relates to the field of battery positive electrode materials, in particular to a doped ternary positive electrode material and its preparation method and application. Background technique [0002] Cathode materials are the most critical raw materials in lithium-ion batteries. In the composition of lithium-ion battery products, the positive electrode material occupies the most important position. The quality of the positive electrode material directly determines the performance index of the final lithium-ion battery product, and the positive electrode material accounts for about 40% of the battery cost. , so it determines the safety performance of the battery, and its cost directly determines the cost of the battery. It should be said that the development of lithium-ion battery cathode materials has led the development of lithium-ion batteries. [0003] Among the cathode materials for lithium batteries currently being used and developed,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/50H01M4/505H01M4/525H01M10/0525C01P2006/40Y02E60/10
Inventor 任海朋崔军燕李嘉俊陈婷婷
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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