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Negative plate and application thereof

A technology of negative electrode sheet and negative electrode activity, which is applied to the negative electrode sheet and its application field, can solve the problems of increased polarization, increased internal resistance, thermal runaway, etc. The effect of raising the nucleation barrier

Active Publication Date: 2021-02-23
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Once metal lithium is precipitated on the surface of the negative electrode, lithium will be peeled off during the subsequent discharge process. Part of the lithium can continue to electrochemically contact with the graphite material, part of which will form dead lithium, and part of the lithium will electrochemically react with the electrolyte, resulting in activity. lithium loss
The more serious situation is that lithium analysis will accelerate the polarization increase of lithium-ion batteries, increase internal resistance, fast capacity decay, and shorten cycle life. If a large amount of lithium is deposited on the surface of the negative electrode to form lithium dendrites, it is easy to pierce the separator and cause positive discharge. The negative pole is short-circuited, resulting in an explosion due to thermal runaway

Method used

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  • Negative plate and application thereof
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  • Negative plate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The schematic diagram of the negative plate of the present embodiment is as follows image 3 As shown, the preparation method of negative electrode sheet and lithium ion battery is as follows:

[0056] 1) Preparation of negative electrode sheet

[0057] Graphite, conductive carbon black, styrene-butadiene latex (SBR), and sodium carboxymethylcellulose (CMC) are added to deionized water at a mass ratio of 96:1.5:1.5:1 and stirred evenly to make a negative electrode active slurry; The obtained negative electrode active slurry is evenly coated on the upper and lower functional surfaces of the negative electrode current collector 101 copper foil, the pole piece width is 50 mm, and the total length of the pole piece is 942 mm. The coating length of the functional surface is 888mm, and the coating length of the lower functional surface is 776mm. The negative electrode active slurry coated on the upper and lower functional surfaces of the copper foil is aligned with one end, ...

Embodiment 2

[0066] The difference between this embodiment and Embodiment 1 is that the mass percent content of each component of the safety function layer 103 in the negative electrode sheet is 55% nickel, 35% boehmite, and 6% polyvinylidene fluoride ( PVDF), 4% polyvinylpyrrolidone (PVP). The rest of the steps are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0068] The difference between this embodiment and Embodiment 1 is that the mass percentages of the components of the safety function layer 103 in the negative electrode sheet are 60% nickel, 30% boehmite, and 6% polyvinylidene fluoride ( PVDF), 4% polyvinylpyrrolidone (PVP). The rest of the steps are the same as in Example 1, and will not be repeated here.

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Abstract

The invention provides a negative plate and application thereof. According to the negative plate provided by the invention, the safety functional layer containing metal and ceramic is coated on the negative active layer, so the negative electrode potential of the lithium ion battery in the low-temperature high-rate charging process and the nucleation energy barrier of metal lithium are effectivelyimproved, the negative lithium precipitation phenomenon is avoided, and meanwhile, as the ceramic has good heat insulation performance, the thermal runaway phenomenon of the acupuncture experiment can be effectively prevented, and the safety performance of the battery is improved. The negative plate is applied to the lithium ion battery, and the obtained lithium ion battery has the advantages ofgood cycle performance and high safety.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a negative electrode sheet and an application thereof. Background technique [0002] Lithium-ion battery is an ideal electrochemical energy storage device, which has the advantages of high energy density, long cycle life and long standby time, and is widely used in consumer electronics and electric vehicles. With the popularization of electric vehicles, the safety of lithium-ion batteries under low-temperature and high-rate charging is facing severe challenges. [0003] The electrical properties of lithium-ion batteries are greatly affected by the kinetic properties. Specifically, when lithium ions are embedded in graphite materials, they need to be desolvated, so this process will consume a certain amount of energy and hinder the diffusion of lithium ions into the interior of graphite; On the contrary, when lithium ions are deintercalated from the graphite material, since des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/62H01M10/0525H01M10/42
CPCH01M4/133H01M4/628H01M10/0525H01M10/4235Y02E60/10H01M4/13H01M4/62H01M2004/027H01M2004/021H01M4/134H01M4/366H01M4/52H01M4/623
Inventor 张双虎彭宁谢斌
Owner ZHUHAI COSMX BATTERY CO LTD
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