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Secondary battery

A secondary battery and electrolyte technology, applied to secondary batteries, battery electrodes, circuits, etc., can solve problems such as diving, negative electrode kinetics reduction, and lower battery cell lithium analysis window

Active Publication Date: 2019-08-20
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the intercalation and extraction of lithium ions in the negative electrode continue, the extrusion force of the positive electrode and the negative electrode increases simultaneously, causing the electrolyte to be squeezed out from between the positive and negative electrodes, and the kinetics of the negative electrode is reduced, thereby reducing the lithium separation window of the cell. And then lead to sharp attenuation of circulation, diving

Method used

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preparation example Construction

[0046] When the secondary battery is a lithium-ion battery, a conventional lithium-ion battery preparation method can be used, which at least includes the following steps:

[0047] Step 1. Coating the positive electrode slurry including the positive electrode active material, conductive agent and binder on the surface of the positive electrode current collector, forming a positive electrode active material layer after drying, and obtaining the positive electrode sheet;

[0048] Step 2, coating the negative electrode slurry including the negative electrode active material and the binder on the surface of the negative electrode current collector, forming a negative electrode active material layer after drying, and obtaining the negative electrode sheet;

[0049] Step 3: Stack the positive pole piece, the separator and the negative pole piece sequentially, and then wind or press them to obtain a bare cell, then inject electrolyte, and package to obtain a secondary battery.

[005...

Embodiment

[0076] Preparation of negative electrode sheet

[0077] Mix carbon material A and carbon material B with conductive agent carbon black Super P and binder styrene-butadiene rubber (SBR) according to the weight ratio of 92:3:5 according to different proportions, add solvent N-methylpyrrolidone, stir and mix Negative electrode slurry is obtained after uniformity. Evenly coat the negative electrode slurry on the coating layer of the negative electrode current collector, dry it at 80-90°C after coating, perform cold pressing, slitting, and cutting into pieces, and then dry it under vacuum at 110°C for 4 hours. Negative electrode sheets 1 to 12 were obtained. The preparation method of the negative pole pieces D1-D5 is similar to that of the negative pole pieces 1-12, except that the carbon material has changed. Wherein, carbon material A includes carbon materials A1-A4, and carbon material B includes carbon materials B1-B4. The physical and chemical parameters of the above-menti...

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Abstract

The invention relates to a secondary battery including a positive electrode pole piece, a negative electrode pole piece, an isolating membrane and an electrolyte. The positive electrode pole piece includes a positive active material layer containing a ternary positive electrode material. The negative electrode pole piece includes a negative active material layer, and active materials contain a carbon material A and a carbon material B. The carbon material B has a high reversible capacity and cooperates with the ternary positive electrode material to achieve a high gram capacity of the battery.Compared with the carbon material B, the carbon material A has a low degree of graphitization, a relatively large interlayer spacing and higher mechanical strength. The combination of the two carbonmaterials ensures that the negative electrode pole piece has both high reversible capacity and good pressure resistance, and the cycle life of the battery is improved.

Description

technical field [0001] The present application relates to the field of secondary batteries, in particular, to a secondary battery and negative electrode active materials in the secondary battery. Background technique [0002] With the popularity of electric vehicles around the world, electric vehicles have higher and higher requirements for cruising range, and correspondingly, it is required to increase the energy density of power batteries. Facing these demands, the layered ternary cathode material NCM(Li(Ni x mn y co z )O 2 , where x+y+z=1) came into being. Compared with the LCO cathode material, Mn and Ni elements are introduced into the NCM material. The Mn element is not chemically active, but it can improve the safety and stability of the material, and at the same time reduce the cost of the material. Ni element can improve the material activity and increase the gram capacity of the material. However, during the charging and discharging process of the ternary mat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M10/0525H01M2004/021H01M4/587H01M4/133H01M4/1393H01M2004/027Y02E60/10
Inventor 曹俊琪张小细闫传苗余洋黄海宁
Owner CONTEMPORARY AMPEREX TECH CO
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