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Negative electrode piece of lithium ion battery and fabrication method of negative electrode piece

A technology for lithium-ion batteries and manufacturing methods, which is applied in the field of lithium-ion battery negative plates and their production, can solve the problems of poor cycle performance of batteries, and achieve the effects of high rate performance, high cycle stability, and high durability

Active Publication Date: 2016-04-06
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium-ion battery negative plate with good cycle performance, high cycle life and improved low-temperature performance of the battery in order to solve the defect that the existing lithium-ion battery negative electrode material uses natural graphite to make the battery cycle performance poor.

Method used

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  • Negative electrode piece of lithium ion battery and fabrication method of negative electrode piece

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Embodiment 1

[0029] A method for making a negative electrode sheet of a lithium ion battery, the method comprising the following steps: a) Preparation of a negative electrode slurry: dissolving 20 g of sodium carboxymethylcellulose CMC in 1230 g of deionized water, stirring and dispersing for 5 hours to obtain a solid CMC glue with a content of about 1.6%, then 10gVGCF and 10gSP were added to the CMC glue for 1h of stirring and dispersion, and then 935g of natural graphite was added in 2 times on average, and the interval between adding negative electrode materials was 0.5h. After stirring at high speed for 3 hours, add 25 g of styrene-butadiene rubber SBR emulsion with a solid content of 50%, and stir evenly for 2 hours to detect that the viscosity of the slurry is 2600 cps, and the solid content of the slurry is 36% at this time;

[0030] b) Uniformly coat the prepared negative electrode slurry on the negative electrode current collector copper foil with a thickness of 10 μm, and the coat...

Embodiment 2

[0036] A method for making a negative electrode sheet of a lithium ion battery, the method comprising the following steps: a) Preparation of a negative electrode slurry: dissolving 10 g of sodium carboxymethylcellulose CMC in 545.55 g of deionized water, stirring and dispersing for 4 hours to obtain CMC glue with a solid content of about 1.8%, then add 2.5g of conductive graphite and 2.5g of SP into the CMC glue for 1.5h of stirring and dispersing, then add 960g of natural graphite in 4 times on average, and the interval between adding negative electrode materials The time is 0.5h, after stirring at high speed for 5.5h, then add 15g of styrene-butadiene rubber SBR emulsion with a solid content of 50%, and stir evenly for 3 hours to detect that the viscosity of the slurry is 5600cps, and the solid content of the slurry is 46% at this time;

[0037] b) Uniformly coat the prepared negative electrode slurry on the negative electrode current collector copper foil with a thickness of...

Embodiment 3

[0043] A method for making a negative electrode sheet of a lithium ion battery, the method comprising the following steps: a) Preparation of a negative electrode slurry: dissolving 25 g of sodium carboxymethylcellulose CMC in 1641.67 g of deionized water, stirring and dispersing for 5 hours to obtain CMC glue with a solid content of about 1.5%, then add 60g of superconducting carbon into the CMC glue for 2 hours of stirring and dispersion, then add 880g of natural graphite in 3 times on average, and the interval between each addition of negative electrode material is 0.5h , after high-speed stirring for 6 hours, then add 35g of styrene-butadiene rubber SBR emulsion with a solid content of 50%, and evenly stir for 4 hours to detect that the viscosity of the slurry is 8000cps, and the solid content of the slurry is 36% at this time;

[0044] b) Uniformly coat the prepared negative electrode slurry on the negative electrode current collector copper foil with a thickness of 5 μm, a...

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Abstract

The invention relates to a negative electrode piece of a lithium ion battery and a fabrication method of the negative electrode piece. The negative electrode piece of the lithium ion battery comprises a negative electrode current collector, a negative electrode material layer and a soft carbon layer, wherein the negative electrode material layer is applied onto the current collector, and the soft carbon layer is applied onto the negative electrode material layer. The fabrication method of the negative electrode piece of the lithium ion battery comprises the following steps of preparing a negative electrode paste; coating the negative electrode paste; preparing a soft carbon paste; coating the soft carbon paste; and grinding the negative electrode piece. By uniformly applying the soft carbon paste onto the negative electrode material layer, the compatibility of the negative electrode piece and an electrolyte can be improved, the side reaction of a negative electrode and the electrolyte is reduced, the expansion of the negative electrode also can be reduced to a certain extent, thus, the cycle performance of the battery is improved, and meanwhile, the low-temperature performance of the battery is further improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery negative plate with good cycle performance and high cycle life, which can also improve the low-temperature performance of the battery and a manufacturing method thereof. Background technique [0002] With the rapid development of electric vehicles and hybrid electric vehicles, there is a demand for power lithium-ion batteries with higher power density and energy density, suitable for fast charging and discharging, and energy-type lithium-ion batteries with longer battery life. very urgent. [0003] With the development of the lithium-ion battery industry, the application of lithium-ion batteries is becoming more and more widespread, and the market's requirements for lithium-ion batteries are also getting higher and higher, especially for the energy density of lithium-ion batteries. Today, electric vehicle technology is becoming more and more perfect. Li...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/10
Inventor 周伟瑛吕豪杰
Owner WANXIANG 123 CO LTD
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