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Preparation of concentration gradient magnesium-doped lithium-rich manganese-based oxide positive electrode material and lithium battery application of concentration gradient magnesium-doped lithium-rich manganese-based oxide positive electrode material

A lithium-rich manganese-based, concentration gradient technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems affecting cycle stability, good sphericity, less gradients, etc., and achieve low raw material costs , Maintain stability and high matching effect

Active Publication Date: 2021-08-24
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the high transition metal content on the surface of the existing positive electrode material is likely to cause side reactions with the electrolyte during the charge and discharge process and affect the cycle stability. The preparation method of oxide cathode materials, the precursor and cathode materials obtained by this method have good sphericity, and the element distribution shows the characteristics of less transition metals on the surface and gradient changes

Method used

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  • Preparation of concentration gradient magnesium-doped lithium-rich manganese-based oxide positive electrode material and lithium battery application of concentration gradient magnesium-doped lithium-rich manganese-based oxide positive electrode material
  • Preparation of concentration gradient magnesium-doped lithium-rich manganese-based oxide positive electrode material and lithium battery application of concentration gradient magnesium-doped lithium-rich manganese-based oxide positive electrode material
  • Preparation of concentration gradient magnesium-doped lithium-rich manganese-based oxide positive electrode material and lithium battery application of concentration gradient magnesium-doped lithium-rich manganese-based oxide positive electrode material

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Effect test

Embodiment 1

[0034] Preparation of a lithium-rich manganese-based oxide concentration gradient magnesium-doped modified positive electrode material, setting x = 0.05, that is, the chemical formula is Li 1.1 mn 0.54 Ni 0.13 co 0.13 Mg 0.05 o 2 .

[0035] Step (1): Prepare 1L transition metal mixed salt solution A with a concentration of 2mol L -1 , where manganese nickel cobalt salts are MnSO 4 、NiSO 4 、CoSO 4 The mixture of Mn:Ni:Co molar ratio is 0.54:0.13:0.13. Add another 1L of ammonia water with a concentration of 0.2mol L -1 、Na2 CO 3 The concentration is 2mol L -1 Mix solution B and 0.5LMgSO 4 The concentration is 0.25mol L -1 solution C.

[0036] Step (2): Use circulating water to control the temperature of the reactor at 55° C., set the stirring speed of the stirring paddle in the reactor to 800 rpm, and then use solution B to adjust the pH value to 7.8. After the pH of the system is stable, use a peristaltic pump to add solution C to the constantly stirring solution...

Embodiment 2

[0041] Preparation of a lithium-rich manganese-based oxide concentration gradient magnesium-doped modified cathode material, setting x = 0.07, that is, the chemical formula is Li 1.06 mn 0.54 Ni 0.13 co 0.13 Mg 0.07 o 2 .

[0042] Step (1): Prepare 1L transition metal mixed salt solution A with a concentration of 1mol L -1 , where manganese-nickel-cobalt salt is MnSO 4 、NiSO 4 、CoSO 4 The mixture, the molar ratio is 0.54:0.13:0.13. Add another 1L of ammonia water with a concentration of 0.4mol·L -1 、Na 2 CO 3 The concentration is 1mol L -1 Mix solution B and 175mL MgSO 4 The concentration is 0.5mol L -1 solution C.

[0043] Step (2): Use circulating water to control the temperature in the reactor at 55° C., set the stirring speed of the stirring paddle in the reactor to 900 rpm, and then use solution B to adjust the pH to 8.0. After the pH of the system is stable, use a peristaltic pump to add solution C to the constantly stirring solution A, and then add solut...

Embodiment 3

[0048] Preparation of a lithium-rich manganese-based oxide concentration gradient magnesium-doped modified positive electrode material, setting x = 0.05, that is, the chemical formula is Li 1.1 mn 0.54 Ni 0.13 co 0.13 Mg 0.05 o 2 .

[0049] Step (1): Prepare 1L transition metal mixed salt solution A with a concentration of 1mol L -1 , where manganese nickel cobalt salt is Mn(NO 3 ) 2 , Ni(NO 3 ) 2 , Co(NO 3 ) 2 The mixture, the molar ratio is 0.54:0.13:0.13. Add another 1L of ammonia water with a concentration of 1mol·L -1 、Na 2 CO 3 The concentration is 1mol L -1 Mix solution B and 31mL MgSO 4 The concentration is 2mol L -1 solution C.

[0050] Step (2): Use circulating water to control the temperature in the reactor at 60° C., set the stirring speed of the stirring paddle in the reactor to 1000 rpm, and then use solution B to adjust the pH to 8.0. After the pH of the system is stabilized, use a peristaltic pump to add solution C to the constantly stirring ...

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Abstract

The invention discloses preparation of a concentration gradient magnesium-doped lithium-rich manganese-based oxide and application of the concentration gradient magnesium-doped lithium-rich manganese-based oxide to a lithium battery, the chemical formula of the oxide is Li1.2-2x Mn0.54Ni0.13Co0.13MgxO2, and x is more than 0 and less than or equal to 0.07. the preparation method specifically comprises the following steps: (1) firstly, preparing a manganese salt, cobalt salt, nickel salt and transition metal salt mixed solution and an ammonia water and sodium carbonate mixed solution as a complexing agent and a precipitating agent according to a proportion, and injecting a magnesium salt solution into the transition metal salt mixed solution by utilizing a peristaltic pump; then adding the transition metal salt solution, a precipitator and a complexing agent into a reaction kettle through parallel flow to carry out a co-precipitation reaction to obtain precursor powder with elements distributed in a gradient manner; and (2) mixing and calcining the precursor powder and a lithium salt to obtain the concentration gradient magnesium-doped lithium-rich manganese-based positive electrode material. The gradient doping material is applied to the field of lithium batteries, and is high in discharge capacity and good in cycle performance. The preparation method disclosed by the invention is low in cost, the process has good compatibility with existing equipment, the potential of quantitative production is achieved, and relatively high industrialization value and wide application prospects are shown.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode materials, in particular to a concentration-gradient magnesium-doped modification of a lithium-rich manganese-based oxide and its application to lithium batteries. Background technique [0002] As various countries have successively issued bans on the sale of fuel vehicles, the market for electric vehicles as their substitutes has increased rapidly; at the same time, lithium-ion batteries have received more and more attention as a power source for electric vehicles. People's demand for batteries is increasing. At the same time, in order to alleviate mileage anxiety and reduce costs, it is necessary to develop batteries with higher energy density and better cost performance. At present, cathode materials limit the further improvement of lithium-ion battery cost and performance. The cathodes that have been successfully commercialized mainly include polyanionic, spinel, and layered...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M4/485H01M4/505H01M4/525H01M10/4235H01M10/0525Y02E60/10
Inventor 陈军刘俊祥王佳齐程方益李海霞
Owner NANKAI UNIV
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