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Lithium ion battery negative electrode and preparation method thereof

A lithium-ion battery and negative electrode technology, which is applied in the field of lithium-ion battery negative electrodes and their preparation, can solve problems such as unsatisfactory cycle life and high temperature performance, insufficient power density and energy density, and low specific capacity of graphite-based negative electrode materials. The effect of conductivity, increasing battery energy density, and small internal resistance

Inactive Publication Date: 2017-01-25
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The three types of lithium-ion negative electrode materials currently on the market have their own shortcomings. The specific capacity of graphite negative electrode materials is low, poor compatibility with solvents, cycle life and high temperature performance are not ideal; the lattice volume expansion rate of alloy negative electrode materials reaches 360 %; Lithium titanate material has a high voltage platform and insufficient power density and energy density

Method used

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  • Lithium ion battery negative electrode and preparation method thereof
  • Lithium ion battery negative electrode and preparation method thereof
  • Lithium ion battery negative electrode and preparation method thereof

Examples

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preparation example Construction

[0030] The present invention also provides a kind of preparation method of lithium ion battery negative pole, comprises the steps:

[0031] Step 1: Weigh the carbon nanobelt, conductive agent and binder according to the mass percentage (90-95): (0-4): (2-5) and weigh the materials, and mix them uniformly to form a mixed slurry;

[0032] Step 2: Coating the mixed slurry obtained in Step 1 on the negative electrode current collector to make a lithium ion battery negative electrode.

[0033] Specifically, the thickness of the carbon nanoribbon in the first step is 2-30 nm, the ratio of width to thickness is (10-15):1, and the length is on the order of 1-15 microns.

[0034] Specifically, the binder in the first step is polyvinylidene fluoride (PVDF) or sodium carboxymethyl cellulose (CMC) and styrene-butadiene resin (SBR) or acrylonitrile multi-polymer.

[0035] Specifically, the conductive agent in the step 1 is any one or more of acetylene black, superconducting carbon black, ...

Embodiment

[0047] 1. Weigh the carbon nanobelt, conductive agent, and binder according to a certain mass percentage, and evenly mix them into a mixed slurry (the mass ratio of carbon nanobelt, conductive agent, and binder is 95:2:2.5; The thickness of the carbon nanobelt is 2-30nm, the ratio of width to thickness is (10-15): 1, and the length is 1-15 microns; the binder is acrylonitrile multi-polymer; the conductive agent is superconducting carbon black SP ; The uniform mixing method of the mixed slurry is high-speed mechanical stirring);

[0048] 2. Apply the mixed slurry obtained in step 1 on the negative electrode current collector (copper foil) to make the lithium ion battery negative electrode;

[0049] 3. The negative electrode of the lithium ion battery obtained in step 2 is rolled and fabricated into sheets, then wound and assembled with the positive electrode sheet and separator, and the lithium ion battery with the carbon nanobelt negative electrode is obtained through liquid i...

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Abstract

The invention provides a lithium ion battery negative electrode, which comprises a negative electrode current collecting body and a negative electrode active material coating the negative electrode current collecting body, wherein the negative electrode active material comprises a carbon nanometer belt, a conducting agent and a bonding agent; the mass ratio of the carbon nanometer belt to the conducting agent to the bonding agent is (90 to 90):(0 to 4):(2 to 5). The lithium ion battery negative electrode provided by the invention has the advantages that the consumption of a negative electrode conducting agent is reduced, or even no conducting agent is used; the proportion of the negative electrode active materials is increased; the battery energy density is increased; in addition, a lithium ion battery with the lithium ion battery negative electrode provided by the invention has the advantages of small internal resistance, good rate capability and long circulation service life. The invention also provides a preparation method of the lithium ion battery negative electrode. The method comprises the following steps of weighing the materials according to the ratio of the carbon nanometer belt to the conducting agent to the bonding agent being (90 to 95):(0 to 4):(2 to 5); uniformly mixing the materials to prepare mixed slurry; coating the mixed slurry onto the negative electrode current collecting body to prepare the lithium ion battery negative electrode.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode and a preparation method thereof. [0003] 【Background technique】 [0004] With the vigorous promotion of new energy vehicles, the demand for power batteries is increasing day by day. Compared with lead-acid batteries, nickel-metal hydride batteries and nickel-cadmium batteries, lithium-ion batteries have many advantages such as high working voltage, high energy density, and long cycle life, and occupy a higher market share in the field of power batteries. The anode material is an important part of the lithium-ion battery. The anode material of the lithium-ion battery should have the oxidation-reduction potential of the electrochemical reaction as low as possible, high specific capacity, small volume effect during the electrochemical reaction, high conductivity, and lithium ion transmission and diffusion. It has the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M4/66H01M4/583H01M4/62H01M4/1393H01M4/133H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/133H01M4/1393H01M4/583H01M4/622H01M4/625H01M4/64H01M4/66H01M10/0525H01M4/587Y02E60/10C01B32/15B82Y40/00H01M4/623H01M4/661H01M2004/027
Inventor 杨国龙
Owner OPTIMUM BATTERY CO LTD
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