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A kind of battery electrode and its preparation method and battery

A battery electrode and battery technology, applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, electrode carriers/collectors, etc., can solve the problems of poor high-temperature performance of the battery and the inability to conduct heat from the inside to the environment in time, and achieve uniform dispersion, The effect of reducing fever and avoiding reunion

Active Publication Date: 2020-12-08
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a battery electrode, which has a fast heat conduction path with a specific orientation inside the battery material, so that the heat inside the battery can be effectively transferred to the environment extension, so as to solve the problem of the internal heat of a single battery in the prior art. The heat generated cannot be conducted from the inside to the environment in time, resulting in poor high-temperature performance of the battery

Method used

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  • A kind of battery electrode and its preparation method and battery
  • A kind of battery electrode and its preparation method and battery
  • A kind of battery electrode and its preparation method and battery

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preparation example Construction

[0060] Correspondingly, an embodiment of the present invention also provides a method for preparing a battery electrode, comprising the following steps:

[0061] (1) A current collector is provided, and a thermally conductive modified layer is prepared on the current collector by a physical coating method, a chemical vapor deposition method, an evaporation deposition method or a sputtering method;

[0062] (2) Take graphene with a sheet-like structure, and prepare graphene surface-modified with magnetically responsive nano-dots by microwave synthesis, hydrothermal method, magnetron sputtering method, evaporation deposition method or chemical vapor deposition method;

[0063] (3) Mix the graphene whose surface is modified with magnetically responsive nano-dots with electrode active materials and binders to obtain a slurry, and apply the slurry evenly on the thermally conductive modification layer under the action of an external magnetic field surface, and dried under the action...

Embodiment 1

[0087] A method for preparing a battery electrode, comprising the following steps:

[0088] (1) Construction of copper current collector with graphene coating on the surface: soak copper foil (99.9% purity) in 1mol / L hydrochloric acid solution for 10 minutes to remove surface impurities, rinse and dry repeatedly with clean water, then place copper foil in N 2 In a protective atmosphere, the temperature was raised to 600° C. within 30 minutes, and 5% (oxygen accounted for the volume fraction of the entire incoming gas flow) trace oxygen was introduced for 1 hour to perform micro-oxidation treatment to form a three-dimensional current collector with CuO nanowire arrays grown on the surface. Then adjust the atmosphere to H 2 / Ar, heat up to 700°C, and introduce 3% methane / Ar mixed gas (3% is the volume fraction of methane in the total gas), cool down to room temperature naturally after reacting for 1h, and obtain a copper current collector with a graphene coating on the surface,...

Embodiment 2

[0095] A method for preparing a battery electrode, comprising the following steps:

[0096] (1) Construction of aluminum-magnesium alloy current collector with graphene coating on the surface: soak the aluminum-magnesium alloy current collector in 0.1mol / L hydrochloric acid solution for 5 minutes to remove impurities on the surface of the current collector, rinse and dry repeatedly with clean water. Then place the aluminum-magnesium alloy current collector in H 2 In the / Ar mixed atmosphere, the temperature was raised from room temperature to 450 °C at a rate of 10 °C / min, and the temperature was kept constant for 1 hour to remove impurity salts that may remain in the current collector. Then the temperature was raised to 700°C at 3°C / min, and 3% acetonitrile / Ar mixed gas was introduced, and the temperature was naturally cooled to room temperature after 1 hour of reaction to obtain an aluminum-magnesium alloy current collector with a graphene coating on the surface;

[0097] (...

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Abstract

An embodiment of the present invention provides a battery electrode, including a current collector and an electrode material layer disposed on the current collector, the electrode material layer includes an electrode active material and a sheet-like graphene, and the surface of the graphene is modified There are magnetically responsive nano-dots, and in the graphene, the graphene with a mass ratio of more than 50% and the surface of the electrode material layer on the current collector are aligned at an angle of 45°-90°, so as to form a Oriented thermal paths. The cell material of the battery electrode has a fast heat conduction path with a specific orientation inside, so that the heat inside the cell can be effectively transferred outward to the current collector, and then transferred from the current collector to the peripheral environment, which solves the problem of internal heat dissipation in a single cell in the prior art. The generated heat cannot be conducted from the inside to the environment in time, resulting in poor high-temperature performance of the battery. The embodiment of the invention also provides a preparation method of the battery electrode and a battery containing the battery electrode.

Description

technical field [0001] The invention relates to the technical field of energy storage devices, in particular to a battery electrode, a preparation method thereof and a battery. Background technique [0002] Secondary batteries have been widely used in the fields of consumer electronics and communications. Fast charging and high energy are the main requirements for the development of next-generation energy storage technologies. However, as the charging speed of the battery increases and the energy density continues to increase, a large amount of heat will be generated during the working process of the battery, resulting in a sharp rise in the internal temperature of the battery cell, changes in the structure of the electrode material, rapid decline in battery capacity, and potential safety hazards that cannot be ignored. [0003] Battery heat generation and thermal runaway are mainly affected by internal factors such as charge and discharge rate, internal resistance, depth of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/1393H01M4/133
CPCH01M4/133H01M4/1393H01M4/66H01M4/663H01M4/667H01M10/613H01M4/62Y02E60/10H01M4/13H01M10/4235H01M10/654H01M10/653H01M4/628
Inventor 周慧慧李阳兴刘辰光许国成
Owner HUAWEI TECH CO LTD
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