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Pyroelectric composite positive electrode material and preparation method and application thereof

A technology of composite positive electrode material and positive electrode material, applied in the field of pyroelectric composite positive electrode material and its preparation, can solve the problem of slow ion migration rate at the interface between positive electrode matrix material and coating layer, difficult to overcome the problem of structural phase transition, and easy doping elements. generation and other problems, to achieve the effect of low material cost, prevention of heat accumulation, and temperature reduction

Inactive Publication Date: 2020-12-08
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have great technical difficulties, for example, it is difficult to obtain a uniform and stable coating layer, it is difficult for dopant elements to enter the crystal lattice and it is easy to generate impurity phases, and it is difficult for conventional modification methods to overcome the electrochemical cycle of positive active materials. The problem of continuous structural phase change, slow ion migration rate at the interface between the positive electrode matrix material and the cladding layer, and poor cycle safety are still prominent

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  • Pyroelectric composite positive electrode material and preparation method and application thereof
  • Pyroelectric composite positive electrode material and preparation method and application thereof
  • Pyroelectric composite positive electrode material and preparation method and application thereof

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preparation example Construction

[0046] According to the method for preparing the pyroelectric composite positive electrode material in the embodiment of the present invention, the pyroelectric material and the positive electrode material are mixed evenly in an organic solvent, the small particle pyroelectric material will adhere to the surface of the large particle positive electrode material, and the wet after adding the solvent The method of mixing will be more uniform than the dry method, and the solvent can play a role in dispersion. After drying, the pyroelectric composite positive electrode material precursor is obtained, and then the pyroelectric composite positive electrode material precursor is subjected to heat treatment to obtain the pyroelectric composite positive electrode material. When the lithium-ion battery is charged and discharged, due to the existence of internal resistance to generate heat, the temperature of the entire battery rises, and the pyroelectric material mixed in the pyroelectri...

Embodiment 1

[0058] A preparation method of a lead germanate positive electrode composite pole piece:

[0059] (1) Dispersing lead germanate in ethylene glycol and wet ball milling, the ball milling time is 12h, and the particle size is 500nm;

[0060] (2) Continue to add a certain amount of lithium-rich manganese-based positive electrode materials in (1), and continue to add ethylene glycol, and continue to stir vigorously after ultrasonication for 10 minutes. The stirring time is 3 hours. The mass ratio of lithium-rich manganese-based to lead germanate is 100:1.5;

[0061] (3) Filtrating the suspension in (2), and placing the obtained filter residue in an oven to bake at 100° C. to obtain a lead germanate composite cathode material precursor;

[0062] (4) heat-treating the precursor obtained in (3) at 550° C. for 6 hours in a resistance furnace to obtain a lead germanate composite positive electrode material;

[0063] (5) Homogenize the composite positive electrode material in (4) with...

Embodiment 2

[0071] A kind of preparation of lead zirconate titanate positive electrode composite pole piece:

[0072] (1) Dispersing lead zirconate titanate in ethanol and wet ball milling, the ball milling time is 12h, and the particle size is 500nm;

[0073] (2) Continue to add a certain amount of nickel-cobalt lithium manganate positive electrode material in (1), and continue to add ethanol, continue to stir vigorously after ultrasonication for 10 minutes, and the stirring time is 3 hours. The mass of nickel-cobalt lithium manganate and lead zirconate titanate The ratio is 100:1;

[0074] (3) Filtrating the suspension in (2), and placing the obtained filter residue in an oven to bake at 100° C. to obtain a lead zirconate titanate composite cathode material precursor;

[0075] (4) heat-treating the precursor obtained in (3) at 650° C. for 6 hours in a resistance furnace to obtain a lead zirconate titanate composite positive electrode material;

[0076] (5) Homogenize the composite pos...

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Abstract

The invention discloses a pyroelectric composite positive electrode material as well as a preparation method and application thereof. The method comprises the following steps: (1) mixing a pyroelectric material, a positive electrode material and a first organic solvent to obtain a solid-liquid mixture; (2) carrying out solid-liquid separation on the solid-liquid mixture to obtain a solid, and drying the liquid to obtain a pyroelectric composite positive electrode material precursor; and (3) carrying out heat treatment on the pyroelectric composite positive electrode material precursor to obtain the pyroelectric composite positive electrode material. The pyroelectric material doped in the pyroelectric composite positive electrode material can convert heat energy into electric energy, a micro-potential difference is generated at the two ends of the material, a micro-electric field is formed, the micro-electric field can improve the migration rate of Li<+> and electrons, reduce the temperature of a pole piece and a battery and prevent heat accumulation, and therefore the rate capability, the cycling stability and the safety of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a pyroelectric composite positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, no memory effect, long life and environmental friendliness, and have broad application prospects in the fields of 3C consumer goods and power vehicles. However, the development of lithium-ion batteries in the field of power is still in the early stage, and there is still a lot of room for improvement in terms of its electrochemical performance, safety, and cost. So far, commercial cathode materials include nickel-cobalt lithium manganese oxide, lithium iron phosphate, layered and spinel lithium manganese oxide, nickel-cobalt aluminum oxide, lithium-rich manganese-based, etc., but these cathode materials have obvious shortcoming. plate. Nickel-cobalt l...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/131H01M10/0525H01M10/613H01M10/654
CPCH01M4/131H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/028H01M2220/20H01M10/613H01M10/654Y02E60/10
Inventor 邓城李冰梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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