Electro-chemistry energy storing and converting device

An energy conversion device and electrochemical technology, applied in the field of lithium-ion batteries, can solve problems such as electrolytic decomposition, catalytic thermal decomposition, and potential safety hazards that cannot be fully guaranteed, and achieve high specific energy, high safety, and good safety performance.

Active Publication Date: 2008-01-23
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium-ion battery using the above combination cannot fully guarantee the electrolysis of metal lithium and the positive electrode LiCoO du

Method used

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  • Electro-chemistry energy storing and converting device
  • Electro-chemistry energy storing and converting device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] Refer to Figure 1, Figure 2 and Figure 3.

[0026] An electrochemical energy storage and energy conversion device, including a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte. The positive electrode is composed of an aluminum foil current collector and a layered structure of nickel, cobalt, manganese and lithium active material coating on the surface; The negative electrode is composed of an aluminum foil current collector and a mixture / composite of lithium titanate and activated carbon coated on its surface and a small amount of conductive acetylene black.

[0027] 1. Production of positive plate

[0028] Weigh LiNi with a D50 particle size of 8 microns 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Ternary) positive electrode active material, binder and conductive agent, according to 93wt% of positive electrode active material mixture, polyvinylidene fluoride (PVdF) binder N-methyl-2-pyrrolidone (NMP) solution and make The content of PVdF i...

Example Embodiment

[0039] Example 2

[0040] The mass ratio of lithium titanate and activated carbon in the negative electrode is 1:1, and the rest is the same as in Example 1. The above experiment is repeated, and the results are recorded in Table 1.

Example Embodiment

[0041] Example 3

[0042] The mass ratio of lithium titanate and activated carbon in the negative electrode is 1:4, and the rest is the same as in Example 1. The above experiment is repeated, and the results are recorded in Table 1.

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Abstract

The present invention relates to an electrochemical energy storage and conversion device belonging to the technical field of lithium ion battery, which comprises a positive electrode, a negative electrode, a diaphragm and electrolyte and is characterized that the positive electrode is composed of transitional metal lithium ion compound capable of absorbing/discharging lithium ions. The negative electrode is composed of active lithium ion battery material with oxidation and reduction potential higher 1.0V vs. Li/Li+ and mixture or composite of active carbons. The present invention provides a novel energy storage device characterized by safety and high specific energy during high-power discharge and has the advantages of high specific power, great safety and long service life, etc.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to an electrochemical energy storage and energy conversion device. Background technique [0002] At present, lithium-ion batteries are widely used in mobile phones, computers, camera / video recorders, power tools and other fields due to their superior electrochemical performance and environmental friendliness. Generally, the positive electrode material of small and medium-sized lithium-ion batteries adopts transition metal oxides with a layered structure such as lithium cobalt oxide; the positive electrode material of power lithium-ion batteries uses spinel lithium manganese oxide or olivine lithium iron phosphate with high safety. The negative electrode materials mostly use natural graphite, artificial graphite and coke-like carbon materials. However, there are serious problems in the safety of lithium cobalt oxide. The poor high-temperature performance of spinel seri...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/02H01M10/40
CPCY02E60/122Y02E60/10
Inventor 刘兴江杨凯
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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