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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 during overcharge. 2 The decomposition of the electrolyte and the catalytic thermal decomposition of the electrolyte cause serious safety hazards

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

Embodiment 1

[0025] With reference to accompanying drawing 1, Fig. 2 and Fig. 3.

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

[0027] 1. Fabrication of the 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, binding agent and conductive agent, press the N-methyl-2-pyrrolidone (NMP) solution of 93wt% positive electrode active material mixture, polyv...

Embodiment 2

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

Embodiment 3

[0042] The mass ratio of lithium titanate and activated carbon in the negative electrode was 1:4, and the rest were the same as in Example 1. The above test was repeated, and the results were 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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