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
View PDF7 Cites 0 Cited by
  • 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 e

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Over-discharge prevention negative electrode, preparation method thereof and battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] In another embodiment, the present invention provides a method of preparation of the above-described anti-discharged negative electrode, the preparation method comprising:

[0046] The preparation of the anti-translating function layer 2 including the niobium titanium compound is prepared in at least one side surface of the collector 3, and the negative electrode active material layer 1 is prepared on the surface of the anti-transition function layer 2.

Example Embodiment

[0047] Example 1

[0048] This embodiment provides an anti-prevention function layer 2 and an anode active material layer 1, including a first binder and TiNb, including the first binder and TiNb, including the first binder and the negative electrode active material layer 1. 2 O 7 . Anti-transmissive function layer 2 in tinb 2 O 7 The mass content is 75%. The anti-transition function layer 2 has a thickness of 5 μm, and the first binder is a polyamide.

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

Example Embodiment

[0050] Example 2

[0051] In this embodiment, there is provided an anti-prevention function layer 2 and an anode active material layer 1, and the anti-translating function layer 2 includes a first binder and a first binder and a first binder and a first binder. Tinb 2 O 7 . Anti-transmissive function layer 2 in tinb 2 O 7 The mass content is 50%. The thickness of the anti-transition function layer 2 is 10 μm.

[0052] The negative electrode active material layer 1 is identical to Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products