Preparation method for lithium-rich manganese-based positive electrode material with controllable appearance and dimensions

A lithium-rich cathode material, lithium-rich manganese-based technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of insufficient rate performance, low first coulomb efficiency, poor cycle performance, etc., and achieve excellent rate performance. , Wide applicability, environment-friendly effect

Active Publication Date: 2017-08-18
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium-rich manganese-based positive electrode material with dual controllable morphology and size and its preparation method for the problems of low initial coulombic efficiency, poor cycle performance and insufficient rate performance of lithium-rich manganese-based positive electrode materials.

Method used

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  • Preparation method for lithium-rich manganese-based positive electrode material with controllable appearance and dimensions
  • Preparation method for lithium-rich manganese-based positive electrode material with controllable appearance and dimensions
  • Preparation method for lithium-rich manganese-based positive electrode material with controllable appearance and dimensions

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Effect test

Embodiment 1

[0039] (1) First, add the soluble transition metal manganese acetate, nickel acetate, and cobalt acetate into the mixed solvent of water, ethanol and ethylene glycol with a volume ratio of 1:3:1 at a molar ratio of 4:1:1 to prepare a total A homogeneous solution A with a transition metal ion concentration of 0.4mol / L; then add a certain amount of CTAB to the solution and stir evenly, wherein the molar ratio of surfactant to total metal ions is 0.5:1;

[0040] (2) soluble sodium oxalate that the amount of total metal ions is 2 times is dissolved in water, ethanol and ethylene glycol mixed solvent (the three are mixed in equal volume) and is formulated into solution B, wherein the volume ratio of solution B and solution A is 1:1;

[0041] (3) Add solution B prepared in step (2) dropwise to solution A at a rate of 1 mL / min, react for 2 h under sealed conditions, after the reaction is completed, filter the resulting product and wash it repeatedly with deionized water and ethanol, ...

Embodiment 2

[0046] (1) First, add the soluble transition metal manganese chloride, nickel chloride, and cobalt chloride into the mixed solvent of water, ethanol and ethylene glycol with a volume ratio of 3:13:1 at a molar ratio of 4:1:1, Prepare a homogeneous solution A with a total transition metal ion concentration of 0.1mol / L; then add a certain amount of SDBS to the solution and stir evenly, wherein the molar ratio of surfactant to total metal ions is 1:1.

[0047] (2) Sodium hydrogen oxalate of 1.5 times of the amount of total metal ion substances is dissolved in water, ethanol and ethylene glycol mixed solvent (the three are mixed in equal volume) and is formulated into solution B, wherein the volume ratio of solution B and solution A is 1:1;

[0048] (3) Add solution B prepared in step (2) dropwise to solution A at a rate of 3 mL / min, and react for 6 h under sealed conditions. After the reaction is completed, the resulting product is filtered and washed repeatedly with deionized wa...

Embodiment 3

[0053] (1) First, add the soluble transition metal manganese chloride, nickel nitrate, and cobalt chloride into the mixed solvent of water and ethylene glycol with a volume ratio of 3:5 at a molar ratio of 4:1:1 to prepare a total transition metal A homogeneous solution A with an ion concentration of 0.5 mol / L; then add a certain amount of CTAB to the solution and stir evenly, wherein the molar ratio of surfactant to total metal ions is 0.75:1.

[0054] (2) soluble sodium oxalate that the amount of total metal ions is 2 times is dissolved in water, ethanol and ethylene glycol mixed solvent (the three are mixed in equal volume) and is formulated into solution B, wherein the volume ratio of solution B and solution A is 1:1;

[0055] (3) Add solution B prepared in step (2) dropwise to solution A at a rate of 10mL / min per drop, and react for 1h under sealed conditions. After the reaction is completed, filter the resulting product and repeat with deionized water and ethanol. Wash ...

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Abstract

The invention discloses a lithium-rich manganese-based positive electrode material with controllable appearance and dimensions and a preparation method therefor. The general formula of the positive electrode material is xLi<2>MnO<3>.(1-x)LiMO<2> (M is one or more of Mn, Ni or Co, and x is greater than 0 and less than 1); the preparation method comprises the following steps of adding a soluble transitional metal into a solvent and stirring into a uniform solution; then adding a surfactant to the solution, stirring uniformly and then adding a soluble oxalate solution; next, performing a co-precipitation reaction at a normal temperature to obtain an oxalate precursor; and performing pre-sintering on the precursor and then mixing with a lithium salt uniformly, and finally, performing a high-temperature solid-phase reaction to obtain the lithium-rich manganese-based positive electrode material. The obtained positive electrode material is uniform in granule grain diameter distribution, high in degree of crystallinity, controllable in appearance and dimensions, excellent in cycling performance and high in rate capability; and in addition, the method is simple in operation, and green and environment friendly.

Description

technical field [0001] The invention is applied in the fields of positive electrode materials and electrochemistry of lithium ion batteries, and relates to a high-performance lithium ion battery lithium-rich manganese-based positive electrode material with controllable morphology and size and a preparation method thereof. Background technique [0002] As an energy storage device, lithium-ion batteries have been widely used in portable appliances, electric vehicles, large-scale energy storage and other fields due to their high energy density, good safety and stability, and environmental friendliness. The cost of positive electrode materials accounts for the largest proportion in the total cost of lithium-ion batteries, about 50%, and the energy density, power density and other properties of lithium-ion batteries mainly depend on the positive electrode materials. In addition, the positive electrode materials also determine the performance of lithium-ion batteries. Main electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 王先友王钢义丽玲余睿智张小慧杨秀康
Owner XIANGTAN UNIV
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