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Negative electrode for secondary battery

A secondary battery and negative electrode technology, which is applied in the direction of battery electrodes, negative electrodes, lithium batteries, etc., can solve the problems of battery service life characteristics degradation, uneven current distribution, and current density differences, so as to prevent the degradation of cycle efficiency and prevent The increase in battery resistance and the effect of preventing lifespan shortening

Active Publication Date: 2022-01-04
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, a passivation layer may additionally be generated in gaps generated by the above phenomenon, forming so-called "dead lithium (Li)", thereby deteriorating the service life characteristics of the battery
In addition, when the delamination and exfoliation of the passivation layer occur repeatedly, local differences in current density may occur during charging and discharging, so that the current is not evenly distributed, and lithium dendrites with a resinous phase are formed.
In addition, when the dendrites formed as described above grow continuously to penetrate the separator and make contact with the positive electrode, an internal short circuit may occur to explode the battery.

Method used

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  • Negative electrode for secondary battery
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  • Negative electrode for secondary battery

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Embodiment 1 to 10

[0056]

[0057] When the width of the anti-stratification headers 13 is A, the distance between the anti-stratification headers 13 is B, and the depth of the anti-stratification headers 13 is C, it can be constructed under the conditions shown in the table below Lithium secondary battery.

[0058] [Table 1]

[0059] C (unit μm) A (unit μm) B (unit μm) Example 1 20 20 20 Example 2 40 40 40 Example 3 60 60 60 Example 4 40 20 60 Example 5 10 10 10 Example 6 100 100 100 Example 7 200 200 200 Example 8 500 500 500 Example 9 1000 1000 1000 Example 10 5000 5000 5000 Comparative example 1 (without forming anti-delamination header) 0 0 0

experiment example

[0061] The apparent capacity and capacity retention rate when the patterns in Table 1 were applied are shown in Table 2 below. In addition, manufactured in which nickel cobalt manganese (NCM) was used as the positive electrode active material, lithium metal was used as the negative electrode active material, PE separator was set as the separator and ethylene carbonate / ethyl methyl carbonate / dimethyl carbonate (EC / EMC / DMC) 1M LiPF6 VC 0.5% by weight as electrolyte cells for evaluation.

[0062] [Table 2]

[0063] Apparent capacity (mAh) Capacity retention (%), the 200th cycle Example 1 5.25 88.57 Example 2 5.24 86.65 Example 3 5.26 84.15 Example 4 5.28 86.57 Example 5 5.28 70.57 Example 6 5.28 76.57 Example 7 5.28 56.57 Example 8 5.28 46.57 Example 9 5.29 35.78 Example 10 5.21 25.23 Comparative example 1 5.24 20.46

[0064] As shown in the above Table 2, when comparing the capacity ...

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Abstract

The present invention relates to a negative electrode for a secondary battery. The negative electrode for a secondary battery of the present invention includes a negative electrode current collector and a negative electrode active material bonded to at least a part of the surface of the negative electrode current collector. A plurality of anti-delamination current collectors are formed on the negative electrode current collector, in which the negative electrode active material is combined. The negative electrode active material is formed on the inner surface of the delamination preventing collector so that a space portion in which a substance diffusion layer is formed is formed in the delamination preventing collector during charge and discharge.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to Korean Patent Application No. 10-2016-0133470 filed on October 14, 2016 and Korean Patent Application No. 10-2017-0129710 filed on October 11, 2016, which are hereby incorporated by reference in their entirety incorporated. technical field [0003] The present invention relates to a negative electrode for a secondary battery. Background technique [0004] Unlike primary batteries, secondary batteries are rechargeable and have a high possibility of compact size and high capacity. Therefore, many studies on secondary batteries have recently been conducted. With the development of technology and the increase in demand for mobile devices, the demand for secondary batteries as energy sources is rapidly increasing. [0005] The secondary battery is classified into a coin type battery, a cylindrical type battery, a square type battery and a pouch type battery according to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/38H01M4/70H01M4/66
CPCH01M4/134H01M4/38H01M4/66H01M4/70Y02E60/10H01M4/382H01M4/661H01M2004/027H01M4/366H01M4/628H01M10/052
Inventor 曹珍铉尹泫雄
Owner LG ENERGY SOLUTION LTD
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