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Electrochemical energy storage and conversion device having bipolar structure

An energy conversion device and bipolar electrode technology, which is applied in the field of electrochemistry, can solve problems such as poor reliability, and achieve the effects of adjustable voltage, large capacity, and good safety

Inactive Publication Date: 2011-09-28
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

In addition, traditional lithium-ion batteries and electrochemical capacitors are made of single coils or stacked sheets, and the voltage is low. For example, the voltage of lithium-ion batteries is usually 2.5-5V, and the voltage of organic system electrochemical capacitors is usually 2.7-3.2V. In order to achieve high voltage, the monomers need to be connected in series, and the reliability is poor

Method used

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  • Electrochemical energy storage and conversion device having bipolar structure
  • Electrochemical energy storage and conversion device having bipolar structure
  • Electrochemical energy storage and conversion device having bipolar structure

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: with reference to attached figure 1 , figure 2 .

[0022] An electrochemical energy storage and energy conversion device with a bipolar structure, comprising a bipolar electrode, a separator 4 and a non-aqueous electrolyte, wherein the bipolar electrode is composed of an aluminum foil current collector 3 and coated on one side thereof containing The positive electrode coating 1 of nickel-cobalt-manganese-lithium active material with a layered structure and the negative electrode 2 containing lithium titanate and activated carbon mixture / composite on the other side are composed.

[0023] 1. Fabrication of bipolar plates

[0024] 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, polyvinylidene fluoride (PVdF) binding agent and make The content of PVd...

Embodiment 2

[0033] There are 2 pairs of positive and negative poles, the charging cut-off voltage is 6.5V, and the discharge cut-off voltage is 1.5V. The rest is the same as in Example 1. Repeat the above test, and the results are recorded in Table 1.

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Abstract

The invention relates to an electrochemical energy storage and conversion device having a bipolar structure. The electrochemical energy storage and conversion device comprises a bipolar electrode, a diaphragm and a nonaqueous electrolytic solution, wherein one side of the bipolar electrode current collector is made of a positive electrode active material of a lithium battery, and the other side of the bipolar electrode current collector is made of a negative electrode material of a capacitor. As the negative electrode of the electrochemical energy storage and conversion device adopts a combination of lithium titanate and active carbon, the lithium titanate is a lithium-embedded active material, and overcharged electric quantity can be absorbed by the active carbon in a double-electric-layer capacitance / lithium absorption manner; and the electrochemical energy storage and conversion device has the characteristic of large current density working; meanwhile, under overcharging, the lithium ion can be absorbed into a micropore of the active carbon, so the safety influence on the electrochemical device due to separation of the active metal lithium can be avoided; and the electrochemical energy storage and conversion device has the advantages of adjustable voltage, high energy, high specific power, high safety, long service life and the like.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, in particular to an electrochemical energy storage and energy conversion device with a bipolar structure. Background technique [0002] At present, lithium-ion batteries are widely used in mobile phones, computers, video cameras, power tools, electric vehicles and other fields due to their superior electrochemical performance and environmental friendliness; electrochemical capacitors are widely used in the fields of high power and long life Widely used in backup power supply (UPS), pulse power supply, power grid peak regulation, starting power supply and hybrid electric vehicles, etc. 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, and the positive electrode material of power lithium-ion batteries uses spinel lithium manganese oxide or olivine lithium iron phos...

Claims

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Application Information

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IPC IPC(8): H01M16/00H01G9/00H01G9/042
CPCY02E60/13
Inventor 刘兴江杨凯
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST