Method for preparing high-energy-density negative pole piece and lithium ion battery comprising same

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: 2016-05-18
JIANGSU LENENG BATTERY INC
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, patent CN104659332A discloses a high-rate lithium iron phosphate battery positive electrode and its manufacturing method. The current collector body of the electrode is through-hole foam nickel with a three-dimensional conductive skeleton structure, and the surface of the nickel foam conductive skeleton is coated with an electronically conductive protective layer. , the electrode prepared by it has the problems of poor compatibility with electrolyte, poor safety performance and poor rate performance, which affect its popularization and use

Method used

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  • Method for preparing high-energy-density negative pole piece and lithium ion battery comprising same
  • Method for preparing high-energy-density negative pole piece and lithium ion battery comprising same
  • Method for preparing high-energy-density negative pole piece and lithium ion battery comprising same

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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

Provided is a method for preparing a high-energy-density negative pole piece and a lithium ion battery comprising the high-energy-density negative pole piece. By weight, the preparation method comprises the following steps of 1 preparation of negative pole high-viscosity slurry, 2 preparation of modified nickel foam and 3 rolling. According to the high-energy-density negative pole piece and the preparation method of the lithium ion battery of the high-energy-density negative pole piece, the contact internal resistance of electrode active matter and a current collector is effectively reduced, and the comprehensive performance of an electrode is improved. Meanwhile, the surface of the nickel foam is plated with lithium ion containing matter, and therefore the transmission rate of lithium ions in the charging and discharging process can be increased. The advantages of being high in energy density, high in liquid absorption capacity, high in adhesive power and the like are achieved, and the high-energy-density negative pole piece is especially suitable for the 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 Applications(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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