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Over-discharge prevention negative electrode, preparation method thereof and battery

An over-discharge and negative electrode technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of carbon negative electrode capacity exhaustion, negative electrode current collector copper dissolution, potential rise, etc. The process is simple and the effect of preventing over-discharge

Pending Publication Date: 2021-10-08
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN103840130A discloses a lithium battery carbon negative electrode that prevents overdischarge, which is used to solve the problem that the existing carbon negative electrode capacity is exhausted, the potential will rise rapidly, and then the dissolution of copper in the negative electrode current collector and the precipitation on the surface of the positive electrode will occur.

Method used

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  • Over-discharge prevention negative electrode, preparation method thereof and battery

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preparation example Construction

[0045] In another specific embodiment, the present invention provides a method for preparing the above-mentioned anti-overdischarge negative electrode, the preparation method comprising:

[0046] At least one side surface of the current collector 3 is coated with an anti-overdischarge functional layer 2 including a niobium-titanium compound, and a negative electrode active material layer 1 is prepared by coating the surface of the anti-overdischarge functional layer 2 .

Embodiment 1

[0048] This embodiment provides an anti-over-discharge negative electrode. One side surface of the current collector 3 is sequentially provided with an anti-over-discharge functional layer 2 and a negative electrode active material layer 1. The anti-over-discharge functional layer 2 includes a first binder and TiNb 2 o 7 . TiNb in anti-over-discharge layer 2 2 o 7 The mass content is 75%. The thickness of the anti-over-discharge functional layer 2 is 5 μm, and the first binder is polyimide.

[0049] The negative electrode active material layer 1 includes a negative electrode active material, a conductive agent and a second binder in a mass ratio of 97:1:2. The negative electrode active material is graphite; the conductive agent is super P; the second binder is polyimide.

Embodiment 2

[0051] This embodiment provides an anti-over-discharge negative electrode. The surfaces of both sides of the current collector 3 are sequentially stacked with an anti-over-discharge functional layer 2 and a negative electrode active material layer 1. The anti-over-discharge functional layer 2 includes a first binder and TiNb 2 o 7 . TiNb in anti-over-discharge layer 2 2 o 7 The mass content is 50%. The thickness of the anti-over-discharge functional layer 2 is 10 μm.

[0052] The negative electrode active material layer 1 is exactly the same as that in Example 1.

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Abstract

The invention provides an over-discharge-preventing negative electrode, a preparation method thereof and a battery. The over-discharge-preventing negative electrode comprises a current collector, and an over-discharge-preventing functional layer and a negative electrode active material layer are sequentially laminated on the surface of at least one side of the current collector, and the over-discharge-preventing functional layer comprises a niobium-titanium compound. The over-discharge prevention functional layer comprising the niobium-titanium compound is arranged between the current collector and the negative electrode active material layer, so that further reduction of the negative electrode potential is buffered, SEI decomposition and dissolution and precipitation of the current collector are avoided, and the lithium ion battery has the characteristics of simple structure, simple preparation process, small influence on the battery capacity, good over-discharge prevention effect, high safety and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an anti-overdischarge negative electrode, a preparation method thereof and a battery. Background technique [0002] Lithium-ion batteries are widely used in various mobile or stationary energy storage scenarios such as new energy vehicles, consumer electronics and energy storage. Over-discharge is one of the common safety hazards of lithium-ion batteries. Over-discharge phenomena are generally divided into two categories: over-discharge during use and over-discharge during storage. [0003] The use of over-discharge mainly includes the following situations. When the battery is normally discharged at a large rate, due to the inconsistency of the internal polarization of the battery, although the overall potential of the battery is within the normal operating range, the potential of the negative electrode part may be too high and cause over-discharge. In addition, t...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M4/62H01M10/0525H01M10/42
CPCH01M4/133H01M4/1393H01M10/4235H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 车佩佩
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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