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secondary battery

A secondary battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of long charging time, metal precipitation, affecting battery cycle life and safety, etc., and achieve good fast charging performance, high energy density, and good cycle life. Effect

Active Publication Date: 2021-04-27
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, long charging time is one of the important factors limiting the rapid popularization of new energy vehicles
From the perspective of technical principles, the negative electrode has a great influence on the fast charging performance of the battery. If the negative electrode cannot withstand high current charging, metal will be precipitated on the negative electrode during fast charging, and a large number of by-products will be produced on the surface of the negative electrode, which will affect the cycle of the battery. longevity and safety

Method used

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Examples

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preparation example Construction

[0037]Methods for the preparation of these materials are well known and commercially available. Those skilled in the art can make appropriate choices according to the actual use environment.

[0038] Various parameters involved in this specification have general meanings known in the art and can be measured by methods known in the art. For example, it can be tested according to the methods given in the examples of the present invention.

[0039] The construction and production method of the secondary battery of the present invention are known per se. Usually, a secondary battery is mainly composed of a positive electrode piece, a negative electrode piece, a separator, and an electrolyte. Discharge. In order to avoid the short circuit of the positive and negative electrodes through the electrolyte, it is necessary to separate the positive and negative electrodes with a separator. The form of the secondary battery may be, for example, an aluminum case as an outer case, or a ...

Embodiment

[0056] In order to make the object, technical solution and beneficial technical effect of the present invention clearer, the present invention will be further described in detail below in conjunction with examples. However, it should be understood that the embodiments of the present invention are only for explaining the present invention rather than limiting the present invention, and the embodiments of the present invention are not limited to the embodiments given in the specification. The specific experimental conditions or operating conditions that are not indicated in the embodiments are made according to conventional conditions, or according to the conditions recommended by the material supplier.

[0057] 1. Preparation of batteries for testing

[0058] The batteries of Examples 1-16 and Comparative Examples 1-8 were prepared according to the following method:

[0059] A) Preparation of positive electrode sheet:

[0060] Mix the positive electrode active material (see T...

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Abstract

The present invention relates to a secondary battery. Specifically, the secondary battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte, and the negative electrode sheet includes a negative electrode current collector and a negative electrode film coated on at least one surface of the negative electrode current collector and containing negative active materials. Layer, the secondary battery satisfies: 0.12≤α / (β+γ)≤0.6, where α represents the capacity excess coefficient of the battery; β represents the compacted density of the negative electrode film layer, unit g / cm 3 ; γ represents the capacitance per unit area of ​​the negative film layer, unit mAh / cm 2 . The secondary battery has the characteristics of high energy density, fast charging and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and more specifically, the invention relates to a secondary battery. Background technique [0002] New energy vehicles represent the development direction of the world's automobile industry. As a new type of high-voltage, high-energy-density rechargeable battery, secondary batteries have outstanding features such as light weight, high energy density, no pollution, no memory effect, and long service life, so they are widely used in new energy vehicles. [0003] However, long charging time is one of the important factors limiting the rapid popularization of new energy vehicles. From the perspective of technical principles, the negative electrode has a great influence on the fast charging performance of the battery. If the negative electrode cannot withstand high current charging, metal will be precipitated on the negative electrode during fast charging, and a large number of by-products w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 康蒙申玉良王家政何立兵
Owner CONTEMPORARY AMPEREX TECH CO
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