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Preparation method of double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains

A positive electrode material and double-shell technology, which is applied in the field of lithium-ion battery electrode material preparation, can solve the problems of low first-cycle coulombic efficiency, insufficient high-rate charge-discharge capability, and poor material conductivity of lithium-rich layered oxide positive electrode materials. Achieve the effect of improving the high-current charge and discharge capacity, reducing the lithium diffusion resistance, and improving the conductivity

Active Publication Date: 2020-08-25
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]However, the first-cycle coulombic efficiency of the lithium-rich layered oxide cathode material is low, and there is a voltage drop problem during the cycle, especially the poor conductivity of the material, and the high-rate charge Insufficient discharge capacity, which limits its commercial application

Method used

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  • Preparation method of double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains
  • Preparation method of double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains
  • Preparation method of double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains

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Embodiment 1

[0034] Prepare A solution, weigh manganese sulfate, nickel sulfate, cobalt sulfate according to the molar ratio Mn:Ni:Co=4:1:1, and dissolve in deionized water to prepare 2mol / L A solution; prepare B solution, weigh a certain A certain amount of precipitating agent and complexing agent are dissolved in deionized water, wherein the precipitating agent is sodium carbonate, the concentration of sodium carbonate solution is 2mol / L, the complexing agent is ammonia, and the concentration of ammonia is 0.1mol / L; polyvinylpyrrolidone is dissolved in Stir well in deionized water to prepare a 0.1 g / L polyvinylpyrrolidone solution. Co-precipitation is carried out in four stages: Stage 1, add A solution, B solution, and polyvinylpyrrolidone solution dropwise into deionized aqueous solution, control the pH value of the reaction system to 8.0, the stirring speed is 800 rpm, and the solution temperature is 50°C 1. Reaction for 12 hours; Stage 2, stop adding polyvinylpyrrolidone solution drop...

Embodiment 2

[0039] Prepare A solution, weigh manganese nitrate, nickel nitrate, and cobalt nitrate according to the molar ratio Mn:Ni:Co=5:1:1, and dissolve them in deionized water to prepare 0.1mol / L A solution; prepare B solution, weigh A certain amount of precipitating agent and complexing agent are dissolved in deionized water, wherein the precipitating agent is sodium bicarbonate, and the concentration of sodium bicarbonate solution is 0.1mol / L, and the complexing agent is ammonium bicarbonate, and the concentration is 0.01mol / L; Dissolve polyvinylpyrrolidone in deionized water and stir evenly to prepare a 0.5 g / L polyvinylpyrrolidone solution. Co-precipitation is carried out in four stages: stage 1, add solution A, solution B, and polyvinylpyrrolidone solution dropwise into the deionized aqueous solution, control the pH value of the reaction system to 6.0, the stirring rate is 300 rpm, and the solution temperature is 20°C , Reaction for 40 hours; Stage 2, stop adding polyvinylpyrrol...

Embodiment 3

[0043] Prepare A solution, weigh manganese formate, nickel formate, cobalt formate according to the molar ratio Mn:Ni:Co=4:1:1, and dissolve in deionized water to prepare 1mol / L A solution; prepare B solution, weigh certain A certain amount of precipitating agent and complexing agent are dissolved in deionized water, wherein the precipitating agent is potassium carbonate, the concentration of potassium carbonate solution is 1mol / L, the complexing agent is ammonium carbonate, and the concentration is 0.05mol / L; polyvinylpyrrolidone is dissolved in In deionized water, stir evenly to prepare a 5.0 g / L polyvinylpyrrolidone solution. Co-precipitation is carried out in four stages: stage 1, add A solution, B solution, and polyvinylpyrrolidone solution dropwise into the deionized aqueous solution, control the pH value of the reaction system to 9.0, the stirring rate is 3000 rpm, and the solution temperature is 60°C 1. Reaction for 2 hours; Stage 2, stop dripping polyvinylpyrrolidone ...

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Abstract

The invention discloses a preparation method of a double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains. The material is regulated and controlled and designed from the dual perspectives of crystal grain arrangement and secondary particle morphology, the double-shell spherical lithium-rich layered oxide positive electrode material with radially arranged crystal grains is prepared, and the material shows good comprehensive performance, especially excellent rate capability and cycling stability. The material is simple in preparation process, low in production cost, environmentally friendly, expected to realize industrial mass production and wide in application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery electrode materials, and in particular relates to a preparation method of a double-shell spherical lithium-rich layered oxide cathode material with radially arranged crystal grains. Background technique [0002] At present, the rapid development of consumer electronics, electric vehicles and other fields has continuously increased the energy density requirements of lithium-ion batteries, and traditional cathode materials have gradually been unable to meet these requirements. The general formula of lithium-rich layered oxides is xLi 2 MnO 3 •(1-x)LiMO 2 ,M=Ni or Co or Mn, mainly composed of Li 2 MnO 3 and LiNi x1 co x2 mn x3 o 2 Composed of two components, its structure is similar to LiCoO 2 The layered structure has the advantages of high discharge specific capacity (>250mAh / g), high output voltage, green safety, and low production cost, and is expected to become a can...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/366H01M4/628H01M4/624H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 许保磊李荐
Owner HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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