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A kind of preparation method of high specific energy negative pole sheet and lithium ion battery thereof

A lithium-ion battery and negative pole piece technology, which is applied in the direction of electrolyte storage battery manufacturing, electrode manufacturing, battery electrodes, etc., can solve the problems of poor electrolyte compatibility, poor safety performance, and poor rate performance, and achieve good compatibility, The effect of increasing the occupancy ratio and increasing the volumetric energy density

Active Publication Date: 2017-11-03
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, patent CN104659332 A discloses a high-rate lithium iron phosphate battery positive electrode and its manufacturing method. The current collector body of the electrode is through-hole foamed nickel with a three-dimensional conductive skeleton structure, and the surface of the foamed nickel conductive skeleton is coated with an electronically conductive protective film. layer, the electrode prepared by it has the problems of poor compatibility with the electrolyte, poor safety performance and poor rate performance, which affect its popularization and use

Method used

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  • A kind of preparation method of high specific energy negative pole sheet and lithium ion battery thereof
  • A kind of preparation method of high specific energy negative pole sheet and lithium ion battery thereof
  • A kind of preparation method of high specific energy negative pole sheet and lithium ion battery thereof

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Effect test

Embodiment 1

[0015] 1. Preparation of negative high-viscosity slurry: Weigh 1000g of graphite, 300g of activated carbon, and 50g of graphene and mix them uniformly in a three-dimensional mixer, then add 100g of LA133 water-based binder, and stir evenly in a high-viscosity mixer to obtain negative electrode slurry;

[0016] 2. Preparation of modified nickel foam: select nickel foam with a porosity of 85% as the cathode, 0.1mol / L lithium carbonate and copper chloride mixed solution (volume ratio 1:1) as the electrolyte, and a platinum electrode as the anode. Modified nickel foam is obtained by electrodepositing a layer of highly conductive and corrosion-resistant substances on the nickel foam by electrochemical method;

[0017] 3. Afterwards, the negative electrode slurry in step 1 is pressed on the modified nickel foam in step 2 by using a roller press in a static state, wherein the pressing temperature is 80°C, the pressure position is 2Mpa, and the pressing time is 5min, to prepare the neg...

Embodiment 2

[0019] 1. Preparation of negative high-viscosity slurry: Weigh 1000g of graphite, 100g of activated carbon, and 10g of graphene and mix them uniformly in a three-dimensional mixer, then add 50g of LA133 water-based binder, and stir evenly in a high-viscosity mixer to obtain negative electrode slurry;

[0020] 2. Preparation of modified nickel foam: select nickel foam with a porosity of 80% as the cathode, 0.1mol / L lithium carbonate and copper chloride mixed solution (volume ratio 1:1) as the electrolyte, and a platinum electrode as the anode. Modified nickel foam is obtained by electrodepositing a layer of highly conductive and corrosion-resistant substances on the nickel foam by electrochemical method;

[0021] 3. Afterwards, the negative electrode slurry in step 1 is pressed on the modified nickel foam in step 2 by using a roller press in a static state, wherein the pressing temperature is 50°C, the pressure position is 0.5Mpa and the pressing time is 10 minutes, and the nega...

Embodiment 3

[0023] 1. Preparation of negative high-viscosity slurry: Prepare and weigh 1000g of graphite, 500g of activated carbon, and 100g of graphene in a three-dimensional mixer, add 200g of LA133 water-based binder, and stir evenly in a high-viscosity mixer to obtain anode slurry ;

[0024] 2) Preparation of modified nickel foam: select nickel foam with a porosity of 90% as the cathode, 0.1mol / L lithium carbonate and copper chloride mixed solution (volume ratio 1:1) as the electrolyte, and a platinum electrode as the anode. Modified nickel foam is obtained by electrodepositing a layer of highly conductive and corrosion-resistant substances on the nickel foam by electrochemical method;

[0025] 3) Afterwards, the negative electrode slurry in step 1 was pressed on the modified nickel foam in step 2 by using a roller press in a static state, wherein the pressing temperature was 100°C, the pressure position was 5Mpa and the pressing time was 1min, and the negative electrode sheet was pre...

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Abstract

A method for preparing a high specific energy negative pole piece and a lithium ion battery thereof, in parts by weight, comprising the following steps: 1) preparation of negative high-viscosity slurry; 2) preparation of modified nickel foam, and 3) pressing. The invention effectively reduces the contact internal resistance between the electrode active material and the current collector, improves the comprehensive performance of the electrode, and at the same time, the surface of the nickel foam is plated with a substance containing lithium ions, which can increase the transmission rate of lithium ions during charging and discharging. It has the advantages of high energy density, strong liquid absorption capacity, and strong adhesion, and is especially suitable for lithium-ion batteries used in the digital field.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and specifically prepares lithium-ion batteries with high specific energy density through a new method for preparing negative pole pieces. Background technique [0002] Lithium-ion batteries are used in communications, digital, electric vehicles and other fields due to their high energy density, good cycle life, and environmental friendliness. At present, the methods to improve the energy density of lithium-ion batteries mainly include: 1) increasing the compaction density of materials; 2) selecting high-capacity positive and negative electrode materials; 3) selecting high-voltage electrolytes; 4) optimizing battery design and process formula ; 5) Choose a thinner current collector; and the method (1-4) is difficult to make a big improvement under the current conditions, and the improvement measures of the method (5) are nothing more than choosing thinner aluminum foil (15µm) and copper foil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/1393H01M4/66H01M10/058
CPCH01M4/0435H01M4/1393H01M4/661H01M4/667H01M10/058Y02E60/10Y02P70/50
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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