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Negative electrode material, electrochemical device comprising negative electrode material and electronic device

A negative electrode material, coating technology, applied in electrochemical generators, nanotechnology for materials and surface science, negative electrodes, etc.

Active Publication Date: 2019-11-12
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main modification method is to use some hardeners (such as metal salts, inorganic acid salts) or some lithium ion shielding agents to improve the water resistance and stability of the material surface. These methods can alleviate the hydrolysis and collapse of silicate to a certain extent, but Still can't fundamentally solve the hydrolysis problem of silicate

Method used

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  • Negative electrode material, electrochemical device comprising negative electrode material and electronic device
  • Negative electrode material, electrochemical device comprising negative electrode material and electronic device
  • Negative electrode material, electrochemical device comprising negative electrode material and electronic device

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preparation example Construction

[0035] 2. Preparation method of negative electrode material

[0036]The embodiment of the present application provides a method for preparing any of the above negative electrode materials, the method comprising:

[0037] (1) Adding the pre-lithiated silicon-oxygen material and the inorganic coating material to a solvent to form a suspension, filtering and drying to obtain a pre-lithiated silicon-oxygen material whose surface is coated with an inorganic coating layer; and

[0038] (2) Add the above-mentioned pre-lithiated silicon oxide material and polymer whose surface is coated with an inorganic coating layer into a solvent to form a mixed solution, remove the solvent, and heat at about 50-300°C for about 4-12 hours to obtain Negative material.

[0039] In some embodiments, the inorganic coating material includes at least one of the following materials: phosphoric acid, tripolyphosphoric acid, sodium tripolyphosphate, potassium tripolyphosphate, sodium metaaluminate, potassi...

Embodiment

[0090] The performance evaluation of the examples and comparative examples of the lithium-ion battery according to the present application will be described below.

[0091] 1. Preparation of negative electrode active materials

[0092] Prepare the negative electrode active material of embodiment 1-18 according to the following method:

[0093] (1) Pre-lithiated silicon-oxygen material (C%=about 3.2%, Dv50=about 5.1 μm, silicon grain size is about 5nm, buffer phase is Li 2 SiO 3 ) and the inorganic coating material are added to ethanol, stirred for about 0.5-4 hours until a uniform suspension is formed, the formed suspension is filtered, and the filtered material is dried at about 80°C for about 12 hours to obtain an inorganic coating on the surface Layer-coated pre-lithiated silicon oxide material;

[0094] (2) Add the above-mentioned pre-lithiated silicon-oxygen material and the polymer whose surface is covered by the inorganic coating layer to ethanol to form a suspension...

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Abstract

The invention relates to a negative electrode material, an electrochemical device comprising the negative electrode material and an electronic device. The negative electrode material comprises a lithiation silica material, an inorganic coating layer and a polymer coating layer, wherein one Si-O-M bond is at least arranged between the inorganic coating layer and the lithiation silicon oxide material, and M includes at least one of an aluminum element, a boron element, and a phosphorus element. The negative electrode material provided by the invention has relatively high stability to water, relatively high initial coulombic efficiency and relatively good cycling stability.

Description

technical field [0001] The present application relates to the field of energy storage, in particular to a negative electrode material and an electrochemical device and an electronic device containing it, especially a lithium ion battery. Background technique [0002] Due to its 1500-1800mAh / g gram capacity and relatively low volume expansion (<160%), silicon-oxygen anode materials are most likely to become the anode materials for next-generation lithium-ion batteries. However, the first Coulombic efficiency generally lower than 75% is an important reason that limits its application at present. By performing pre-lithiation treatment on silicon-oxygen negative electrode materials, the initial Coulombic efficiency of lithium-ion batteries containing pre-lithiated silicon-oxygen negative electrode materials can be increased to more than 88%, so it has been extensively studied by the industry. However, the pre-lithiation will have a certain impact on the stability of the sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/60H01M10/0525
CPCH01M10/0525H01M4/5825H01M4/628H01M4/362H01M4/386H01M4/134H01M4/136B82Y30/00H01M2004/027Y02E60/10H01M4/485H01M4/366H01M4/602H01M4/62H01M2004/021
Inventor 姜道义陈志焕崔航谢远森
Owner NINGDE AMPEREX TECH
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