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A composite doped nickel-cobalt positive electrode material and its preparation method

A technology of compound doping and positive electrode materials, applied in battery electrodes, electrical components, electrochemical generators, etc. Improved performance and stability

Active Publication Date: 2016-11-23
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the LiNi disclosed above x co y m z o 2 There are still some problems with cathode materials
For example, the preparation process is complicated, and the solid-phase doping method makes the element distribution uneven; the liquid-phase doping method cannot solve the problem of excessive difference in sedimentation velocity caused by high solubility of high-valent hydroxides.
There are also some low-valent element doping will cause more serious Ni 2+ Same as Li + Mixed arrangement; some high-valent element doping will lead to a decrease in the conductivity of the material

Method used

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  • A composite doped nickel-cobalt positive electrode material and its preparation method
  • A composite doped nickel-cobalt positive electrode material and its preparation method
  • A composite doped nickel-cobalt positive electrode material and its preparation method

Examples

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Embodiment 1

[0045] (1) Take nickel chloride, cobalt chloride, magnesium chloride and aluminum chloride crystals in a molar ratio of 8:1:0.5:0.5, dissolve nickel chloride, cobalt chloride and magnesium chloride in water and mix uniformly to obtain solution A, Its metal ion concentration is 2.0mol / L; aluminum chloride and chelating agent sodium citrate are dissolved in water according to the ratio of 1:1 and mixed evenly to obtain solution B; 7mol / L ammonia water and 2mol / L sodium hydroxide solution are The volume ratio of :4 is mixed uniformly to obtain solution C.

[0046] (2) the NaClO of solution A, solution B and solution C and 2mol / L 4 And flow into the continuous reaction kettle, the reaction kettle is filled with the bottom liquid with a pH value of 11.0 and a temperature of 50°C. Control the pH value of the reaction system at 11.0±0.02 through solution C, and react for 30 hours. After the precipitated product is washed, the pH value is below 10.0, the washing is stopped and the s...

Embodiment 2

[0049] (1) Weigh nickel sulfate, cobalt sulfate, zinc sulfate and aluminum sulfate crystals in a molar ratio of 7:2:0.1:0.9, dissolve nickel sulfate, cobalt sulfate and zinc sulfate in water and mix uniformly to obtain solution A, and its metal ions The concentration is 2.0mol / L; dissolve calcium sulfate and chelating agent salicylic acid in water according to the ratio of 1:3 and mix evenly to obtain solution B; mix 2mol / L ammonia water and 4mol / L sodium hydroxide solution according to the volume of 1:3 Mix evenly to obtain solution C.

[0050] (2) the NaClO of solution A, solution B and solution C and 5mol / L 4 And flow into the continuous reaction kettle, the reaction kettle is filled with the bottom liquid with a pH value of 9.5 and a temperature of 70°C. Control the pH value of the reaction system at 10.6±0.02 through solution C, and react for 30 hours. After the precipitated product is washed, the pH value is below 10.0, the washing is stopped and the slurry is dried to...

Embodiment 3

[0053] (1) Weigh nickel chloride, cobalt chloride, calcium chloride and chromium chloride crystals at a molar ratio of 8:0.5:1:0.5, dissolve nickel chloride, cobalt chloride and calcium chloride in water and mix well Obtain solution A, and its metal ion concentration is 2.0mol / L; Dissolve chromium chloride and chelating agent EDTA in water according to 1:1 ratio and mix uniformly, obtain solution B; Mix 4mol / L ammonia water and 6mol / L sodium hydroxide solution Mix evenly according to the volume ratio of 1:2 to obtain solution C.

[0054] (2) Mix solution A, solution B and solution C with 1mol / L NaClO 4 And flow into the continuous reaction kettle, the reaction kettle is filled with the bottom liquid with a pH value of 10.0 and a temperature of 40°C. Control the pH value of the reaction system at 10.4±0.02 through solution C, and react for 30 hours. After the precipitated product is washed, the pH value is below 10.0, the washing is stopped and the slurry is dried to obtain a...

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Abstract

The invention discloses a composite doping type nickel-cobalt positive electrode material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a nickel-cobalt salt solution with low valence metal salt to obtain a solution A, uniformly mixing a high valence metal salt solution with a chelating agent to obtain a solution B, uniformly mixing a complexing agent solution with a precipitant solution to obtain a solution C, stirring and heating the solution A, the solution B, the solution C and an oxidant which are added into a reaction still with a base solution in a parallel flowing manner, carrying out solid-liquid separation on the sizing agent after full reaction, carrying out washing and drying to obtain a nickel-cobalt composite precursor, uniformly mixing the precursor with lithium salt, calcining the mixture in an oxygen atmosphere, grinding and classifying after the calcination, and finally screening to obtain the composite doping type nickel-cobalt positive electrode material. According to the composite doping type nickel-cobalt positive electrode material and the preparation method thereof, the process is simple, the element distribution is uniform, atomic-scale mixing can be achieved and the electric property of the prepared positive electrode material is comprehensively enhanced.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a composite doped nickel-cobalt positive electrode material and a preparation method thereof. Background technique [0002] Currently, layered LiCoO 2 It is the most common positive electrode material in practical lithium-ion batteries, but due to the limited natural resources and high price of cobalt, its application development has been greatly restricted. while LiNiO 2 Considered as the most promising alternative to LiCoO 2 One of the materials whose theoretical capacity is comparable to that of LiCoO 2 It is close to, and has no pollution to the environment, and has advantages in price and resources, but it is difficult to synthesize stoichiometric products, so LiNiO 2 It has not yet been widely promoted and applied. [0003] Combining the advantages of diamond-based and nickel-based materials, the material LiNi is obtained by substituting part of Ni for Co x co 1-x ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/485
CPCH01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 吕正中姜倩荣袁中直刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD