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Lithium ion battery anode sheet

A lithium-ion battery and anode sheet technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of harsh synthesis conditions of anode materials, poor battery performance at low or high temperature, and unfavorable formation, and achieve reversible The effect of capacity and efficiency improvement, stable and dense structure, and improved cycle performance

Active Publication Date: 2013-05-08
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above five technical routes can all improve the coulombic efficiency of the anode to a certain extent, but there are more or less problems, deficiencies or room for improvement: Technical route (1) Due to the harsh synthesis conditions of the anode material, the control The difficulty is very high, and the test volume is very large; both technical routes (2) and (4) have the risk of deteriorating the low-temperature or high-temperature performance of the battery; the technical route (5) is complicated to operate, and due to the anode activity after pre-charging Very high, so the requirements for the production environment and equipment conditions of the battery are extremely high
In contrast, the disadvantages of the technical route (3) are small, but there are still some deficiencies that need to be improved: when the resistance of the anode sheet is very low, after the battery is injected with the electrolyte, the lithium ions intercalated in the anode active material The current density will be very high, which is not conducive to the formation of a dense and stable SEI film, so that the lithium ions in the cathode are still consumed due to the need to form a dense SEI film when they are first inserted into the anode active material.
That is to say, technical route (3) has little improvement in the first Coulombic efficiency of the battery

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: use silicon oxide alloy (Si a o b m c , a=c=0, b=0.95) as the anode active material, the anode active material, sodium carboxymethyl cellulose (CMC)-styrene-butadiene rubber (SBR) as the binder and dispersant, conductive carbon as the conductive agent , in weight percent, according to SiO 0.95 : CMC: SBR = 90: 5: 5 ratio mixing, high-speed stirring to obtain a uniformly dispersed slurry, and then evenly coated on the copper foil, blown to dry, and rolled to obtain a coating with an active material layer Anode sheet; similarly, Al 2 o 3 Particles, adhesive water-based siloxane and water are stirred at a high speed to obtain a uniformly dispersed slurry, and then the slurry is coated on the surface of the active material layer and dried to obtain a high-resistance layer with a thickness of 4 μm; finally, in A layer of lithium metal particles with a median particle size of 20 μm is evenly sprinkled on the high resistance layer, and the resistance per uni...

Embodiment 2

[0026] Example 2: The anode active material is graphite, and the high resistance material used in the high resistance layer is 0.05 μm ZrO 2 , the thickness of the high-resistance layer is 0.5 μm, the adhesive is epoxy silane, the median particle size of lithium metal particles is 4 μm, and the resistance per unit area of ​​the obtained anode sheet is 0.5Ω / mm 2 ; Others are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0027] Embodiment 3: the anode active material is silicon oxide alloy (Si a o b m c , a=c=0, b=0.95) and graphite mixture, the high resistance material used in the high resistance layer is 2μm BaSO 4 The mixture, the binder is a mixture of diaminosilane and vinyl silane, the thickness of the high resistance layer is 5 μm, the median particle size of lithium metal particles is 20 μm, and the resistance per unit area of ​​the obtained anode sheet is 2Ω / mm 2 ; Others are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention discloses a lithium ion battery anode sheet. The anode sheet comprises an anode current collector, an active substance layer, a high-resistance layer and metallic lithium particles, the active substance layer is coated on the anode current collector, the high-resistance layer is positioned on the active substance layer, the median size of the metallic lithium particles is greater than the thickness of the high-resistance layer, and the metallic lithium particles are distributed in and penetrate through the high-resistance layer. Compared with lithium ion batteries made through using anode sheets in the prior art, the lithium ion battery made through using the anode sheet disclosed in the invention has the advantages of increase of the first coulomb efficiency and the reversible capacity, improved circularity, and great reduction of the short circuit current in the battery, so the generation of the short circuit in the battery is reduced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to an anode sheet of a lithium ion battery capable of improving the energy density of the battery. Background technique [0002] Judging from the current market, mobile electronic terminals using lithium-ion batteries as power sources are developing towards thinner, flatter, and more functionally diversified applications. Lithium-ion batteries are also widely used in the field of new energy vehicles. Therefore, the marketization of lithium-ion batteries It also faces many challenges, and high energy density is one of the most important indicators. In a lithium-ion battery system, the reversible specific capacity of the cathode and anode determines the energy density level of the entire battery (in order to avoid the precipitation of lithium dendrites, the capacity of the anode sheet is usually designed to be slightly more than the capacity of the c...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/36H01M4/62
CPCY02E60/122Y02E60/10
Inventor 陈小波袁庆丰赵丰刚李绍刚
Owner NINGDE AMPEREX TECH
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