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Lithium silicate coated lithium-rich manganese-based positive electrode material and preparation method and application thereof

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., to achieve the effect of solving instability, inhibiting the formation of intergranular cracks, and improving capacity retention

Inactive Publication Date: 2020-02-18
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The manganese-based cathode material prepared by the above method needs to be improved in terms of reversible specific capacity, cycle performance and high-voltage performance. In this regard, a lithium-rich manganese-based cathode material coated with lithium silicate and its preparation method and application are proposed. It has a high reversible specific capacity and energy density, which is of great significance to the development of lithium-ion battery technology

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  • Lithium silicate coated lithium-rich manganese-based positive electrode material and preparation method and application thereof
  • Lithium silicate coated lithium-rich manganese-based positive electrode material and preparation method and application thereof

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Embodiment 1

[0058] This embodiment provides a lithium-rich manganese-based positive electrode material coated with lithium silicate Li 2 mn 0.5 Ti 0.5 o 2 F / Li 2 SiO 3 The preparation method, described preparation method comprises the steps:

[0059] (1) mixing the mixed salt solution of manganese sulfate and titanium sulfate, the concentration of hydroxide ion is the sodium hydroxide solution of 5mol / L, the ammoniacal liquor of 8mol / L and the pH value of the bottom liquid to the mixed solution is 10; Liquid is (NH 4 ) 2 SO 4 Mixed aqueous solution with NaOH, in the bottom liquid (NH 4 ) 2 SO 4 The concentration of NaOH is 1.5mol / L, and the concentration of NaOH is 1.5mol / L; the solid-liquid separation is carried out after 12 hours of reaction at 50°C under stirring conditions, and the precursor Mn is obtained after the solid is washed and dried. 0.5 Ti 0.5 (OH) 2 , Mn in the mixed salt solution 2+ with Ti 4+ The total concentration is 10mol / L, the drying temperature is 70°...

Embodiment 2

[0064] This embodiment provides a lithium-rich manganese-based positive electrode material coated with lithium silicate Li 2 mn 0.5 Zr 0.5 o 2 F / Li 2 SiO 3 The preparation method, described preparation method comprises the steps:

[0065] (1) mixing the mixed salt solution of manganese acetate and zirconium sulfate, the concentration of hydroxide ion is the potassium hydroxide solution of 10mol / L, the ammoniacal liquor of 2mol / L and the pH value of the bottom liquid to the mixed solution is 13; Liquid is (NH 4 ) 2 SO 4 Mixed aqueous solution with NaOH, in the bottom solution (NH 4 ) 2 SO 4 The concentration of NaOH is 0.5mol / L, and the concentration of NaOH is 0.5mol / L; after 24 hours of reaction at 70°C under stirring conditions, solid-liquid separation is carried out. After the solid is washed and dried, the precursor Mn 0.5 Zr 0.5 (OH) 2 , Mn in the mixed salt solution 2+ with Zr 4+ The total concentration is 0.01mol / L, the drying temperature is 120°C, and th...

Embodiment 3

[0070] This embodiment provides a lithium-rich manganese-based positive electrode material coated with lithium silicate Li 2 mn 0.5 Ti 0.5 o 2 F / Li 2 SiO 3 The preparation method, described preparation method comprises the steps:

[0071] (1) mixing the mixed salt solution of manganese acetate and tetrabutyl titanate, the concentration of hydroxide ions being 6mol / L sodium hydroxide solution, 4mol / L ammonia water and the bottom liquid until the pH value of the mixed solution is 11; The bottom liquid is (NH 4 ) 2 SO 4 Mixed aqueous solution with NaOH, in the bottom solution (NH 4 ) 2 SO 4 The concentration of NaOH is 1 mol / L, and the concentration of NaOH is 1 mol / L; the solid-liquid separation is carried out after 5 hours of reaction at 60°C under stirring conditions, and the precursor Mn is obtained after the solid is washed and dried. 0.5 Ti 0.5 (OH) 2 , Mn in the mixed salt solution 2 + with Ti 4+ The total concentration is 2mol / L, the drying temperature is ...

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Abstract

The invention provides a lithium silicate coated lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The chemical general formula of the positiveelectrode material is Li2Mn0.5M0.5O2X / Li2SiO3, M is a + 4-valent transition metal, and X is a halogen element. By introducing + 4-valent transition metal ions and halogen element ions, the valence state of Mn in the obtained modified lithium-rich manganese-based positive electrode material is reduced, and the reaction activity of O is reduced, so that the reversible specific capacity and the cycling stability of the material are improved; meanwhile, the lithium silicate is used for compounding the lithium-rich manganese-based positive electrode material, so that the formation of intercrystalline cracks of the material in a high-pressure process is inhibited, and the capacity retention ratio of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a positive electrode material and its preparation method and application, in particular to a lithium-silicate-coated lithium-rich manganese-based positive electrode material and its preparation method and application. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. Among them, the cathode material is currently the main factor limiting the performance of the battery, and the cost of the cathode material is close to 40% of the cost of the lithium-ion battery. To achieve large-scale application of lithium-ion batteries, it is necessary to meet a series of requirements such as low cost, safety, not limite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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