Method for preparing high-power lithium-ion battery conductive agent and lithium-ion battery

A lithium-ion battery and conductive agent technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as hindering battery power performance, poor low-temperature cold start performance, large ion diffusion resistance, etc., to improve low-temperature cold start performance, increase energy density, and improve the effect of terminal voltage

Active Publication Date: 2019-08-16
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A good conductive agent should have a relatively high specific surface area, a moderate particle size, and a high oil absorption value. However, because the current conductive agent is an inorganic conductive agent, it has poor affinity for the electrolyte, which makes the ionic conductivity of the diaphragm Very low, resulting in a large ion diffusion resistance, hindering the improvement of the power performance of the battery cell, manifested as weak fast charging performance, low instantaneous power and poor low temperature cold start performance

Method used

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  • Method for preparing high-power lithium-ion battery conductive agent and lithium-ion battery
  • Method for preparing high-power lithium-ion battery conductive agent and lithium-ion battery

Examples

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Effect test

specific Embodiment approach 1

[0025] A preparation method of a high-power type lithium-ion battery conductive agent, comprising the following steps:

[0026] Step 1: Add the polymer monomer into the aqueous solution containing the templating agent, disperse evenly, stand at -30-50°C for 0.5-24h, add a polymer initiator to initiate the polymerization of the polymer monomer, and stand for 24h to obtain A conductive agent polymer suspension with a solid content of 5-55% by weight;

[0027] Step 2: After the conductive agent polymer suspension is centrifuged, the lower precipitate is ultrasonically washed with absolute ethanol, and then centrifuged again, and the washing and centrifuged steps are repeated several times until the upper layer after centrifugation is colorless and clear. After removing the supernatant, place the lower precipitate in a vacuum drying oven at 60-90°C for 12-48 hours in a vacuum environment and grind to obtain solid powder S;

[0028] Step 3: Place the solid powder S in N 2 Or high...

Embodiment 1

[0040] (1) Preparation of new high-power lithium-ion battery conductive agent M1

[0041] Add the aniline monomer into the aqueous solution of 0.4wt.% cetyltrimethylammonium chloride, disperse evenly and keep it at 25°C for 4 hours, then add ammonium persulfate equivalent to the aniline monomer into the solution to initiate Polymerize and stand for 24 hours to obtain a conductive agent polymer suspension with a solid content of 5-55wt%; after the conductive agent polymer suspension is centrifuged, the lower sediment is ultrasonically washed with absolute ethanol, and the ultrasonic frequency is 80- 150KHz, ultrasonic time is 30min, and then centrifugal separation, repeat the washing and centrifugal separation steps several times, until the supernatant liquid after centrifugation is colorless and clear, after removing the supernatant liquid, put the lower precipitate in a vacuum drying oven at 85°C The environment was dried for 12h and ground to obtain a solid powder S; the sol...

Embodiment 2

[0049] The difference between Example 2 and Example 1 lies in that the conductive agent D1 in the positive electrode sheet P1 contains 100 wt% of M1 instead of 100 wt% of conductive carbon black Super-P. In the negative electrode sheet N1, the conductive agent E1 contained 100wt% of conductive carbon black Super-P was changed to 100wt% of M1. The prepared battery is denoted as C2.

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Abstract

The invention discloses a method for preparing a high-power lithium-ion battery conductive agent and a lithium-ion battery, relating to the technical field of lithium-ion batteries. The specific scheme is as follows: a polymer monomer is added into an aqueous solution containing a templating agent, uniformly dispersed, and allowed to stand at 30 to 50 DEG C for 0.5 to 24 hours, and a polymer initiator is added to initiate the polymerization of a polymer monomer to obtain a conductive agent polymer suspension with the solid content of 5 to 55 wt%; after the centrifugal separation of the conductive agent polymer suspension, a lower layer sediment is washed with absolute ethanol for several times until a supernatant is colorless and clear, after removing the supernatant, the lower layer sediment is placed in a 60 to 90 DEG C vacuum environment in a vacuum drying oven for 12 to 48 hours and is ground to obtain solid powder S; the solid powder S is placed in a N2 or Ar gas atmosphere environment for high-temperature carbonization to obtain the high-power lithium-ion battery conductive agent. Positive and negative electrodes made by using the conductive agent prepared by the invention have high electron conductivity and ionic conductivity, and the large-rate charge and discharge ability of the lithium-ion battery can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a high-power lithium ion battery conductive agent and a lithium ion battery containing the conductive agent. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, flexible size, and unlimited application fields, so they have received keen attention and vigorous pursuit from various industries. The rapid development of lithium-ion battery technology has greatly promoted industries such as mobile phones, laptops and other portable electronic devices, as well as new energy vehicles. Higher and more advanced technical product requirements. Today, when the volume energy density and weight energy density have reached the bottleneck, various industries have begun to put forward more and more stringent technical requirements for batteries in terms of fast charging, instantaneous power, and low-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 何江龙申红光樊亚楠刘城赖冠全叶璐田义军李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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