High specific capacity secondary lithium ion cell

A lithium-ion battery, high specific capacity technology, used in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of decreased electrode porosity, increased porosity, and hindered electrolyte penetration.

Inactive Publication Date: 2005-10-26
EVE HYPERPOWER BATTERIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the energy density, increasing the packing density and thickness of the electrode will reduce the porosity of the electrode, hinder the penetration of the electrolyte, and lead to a decrease in the conductivity of lithium ions, resulting in the inability of the active material in the electrode to participate effectively. charge and discharge reaction
At this time, even if the above-mentioned additives are added to the electrode, the charge and discharge performance of the battery, especially the high rate discharge and low temperature performance, will still be greatly reduced.
In order to improve the penetration of the electrolyte, one possible method is to increase the porosity of the electrode, but the increase of the porosity will naturally reduce the strength of the electrode, and will also cause the separation of the active substances inside the electrode.
On the other hand, if the amount of binder is increased to increase the mechanical strength, the energy density of the electrode will decrease again

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] example 1. The various oxides listed in Chart-1 have prepared the secondary lithium-ion batteries shown in the table, and evaluated with the utilization rate of the negative electrode active material; the utilization rate here refers to the fifth discharge capacity of the battery and the theoretical capacity. percentage.

[0023] Battery preparation method:

[0024] 1. Manufacture of negative electrode: Natural graphite is a negative electrode active material mixed with oxides (hereinafter represented by Y) in Table-1. The particle size of natural graphite is 18 μm, and the average particle size of Y is 70 nm. The amount of Y is 0.3 part by weight in 100 parts of active matter, and the obtained mixture uses the styrene-butadiene resin aqueous dispersion as a binder, and the aqueous solution of carboxymethylcellulose CMC as a thickener to make a slurry. The ratio of active matter, binder, thickener is 97:2:1. Apply the obtained slurry on both sides of a 20 μm thick co...

example 2

[0035] Example 2. Batteries 9-12# and comparative batteries C2-C3 were manufactured in the same manner as in Example 1. The difference is that only the oxide LiAlSiO is used 4 As Y, but the granularity of Y varies, as shown in Table-2. Utilization is also evaluated with the same method as Example 1, and the results are shown in Table-2. Table-2 also illustrates the thickness and porosity of the negative electrode.

[0036] Oxide "Y" in

[0037] As shown in Table-2 results, 9-12# batteries contain LiAlSiO 4 The particle size ranges from 10-300nm and has a utilization rate of not less than 88%. However, C-2 containing 0.005 μm Y as a comparative battery, and C-3 containing Y with 0.5 μm particle size have only 67% and 71% negative electrode utilization. The negative electrodes of the C-2 and C-3 batteries were cut open, and SEM analysis was performed on the section, and it was found that the particles of the oxide Y had secondary aggregation and were not uniform...

example 3

[0038] Example 3. Cells 13-17 are manufactured in the same way as Example 1, except LiAlSiO 4 The particle size is 0.07μm, which is different from the weight of the oxide Y in every 100 parts of the negative electrode active material. As shown in Table-3, as a comparison, a comparative battery C-4 was made, and the oxide Y was not contained in C-4. . The negative electrode utilization rate of each battery is evaluated using the same method as Example 1, and the results are shown in Table-3, which also lists the negative electrode thickness and porosity.

[0039] Y number of copies / every 100

[0040] As shown in the results in Table-3, compared with the comparative battery C-4, the utilization rate of the negative electrode of No. 13-17 batteries is improved, especially No. 14-16 batteries contain LiAlSiO 4 0.01-1 part / 100 parts of negative electrode active material, the utilization rate of negative electrode active material is not less than 83%.

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Abstract

A high-specific capacity secondary Li ionic battery includes a shell containing an electrolyte bag, a positive, a membrane and a negative, among which, the positive is composed of a positive collector and Li compound oxide attached to its surface, the negative is composed of a negative collector and adsorption and de-adsorption Li ionic substance containing inactive oxide fast ions adhered on its surface, thickness of the active substance adhered on the negative surface is 0.03-0.30mm, the weight ratio of the inactive oxide fast ions playing the role of a conductor and the negative active substance is 0.01-1.0:100, the mean diameter of the ions is 10-300nm. When using as active material to fill in a thick electrode with high density, an inorganic oxide fast ionic conductor is applied to the negative to improve the Li ionic transmission efficiency from the active substance to the negative surface.

Description

technical field [0001] The invention relates to a high specific capacity secondary lithium ion battery, in particular to a high specific capacity secondary lithium ion battery containing inorganic oxide fast ions not participating in charging and discharging reactions in the negative electrode. Background technique [0002] With the improvement of integration and function of various mobile electronic products, the requirements for battery capacity are also increasing. Since the negative electrode of the secondary metal lithium battery is made of metallic lithium or its alloys, and the theoretical specific capacity of lithium metal is about ten times that of graphite, the conventional carbon negative electrode material, the research on lithium secondary batteries with metallic lithium as the negative electrode has become a A hot spot in recent years. Generally, the structure of such a secondary lithium-ion battery is a positive electrode formed of a lithium-containing compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525
CPCY02E60/122H01M10/0525H01M4/131H01M4/13Y02E60/10
Inventor 王洪郭春泰
Owner EVE HYPERPOWER BATTERIES INC
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