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Anode diaphragm and lithium ion battery using same

A technology of positive electrode film and carbon number, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of poor electrochemical stability, high viscosity, and adverse effects on the electrical properties of lithium-ion batteries, and achieve improved Battery safety, good electrical performance, and the effect of improving safety

Active Publication Date: 2015-05-27
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of organic flame retardants usually has an adverse effect on the electrical properties of lithium-ion batteries.
For example, commonly used organic flame retardant alkyl phosphate compounds (such as TMP, TEP, etc.), although they can improve the safety of lithium-ion batteries, due to their high viscosity and poor electrochemical stability, when used in lithium-ion batteries, It will reduce the ionic conductivity of the electrolyte and the cycle performance of the battery

Method used

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  • Anode diaphragm and lithium ion battery using same
  • Anode diaphragm and lithium ion battery using same
  • Anode diaphragm and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation / source of trichloroethyl phosphate intercalated expandable graphite EG1:

[0042] Place natural graphite with a median particle size D50 of 50um in a mixed solution of concentrated phosphoric acid-concentrated nitric acid at a ratio of 1:1, stir for 30 minutes, filter and wash to PH=7.0 to obtain expandable graphite, and place the obtained expandable graphite in phosphoric acid In the trichloroethyl ester + acetic acid mixture, pressurize to 100Mpa at 100°C, and stir at high speed with electromagnetic stirring for 10h to obtain trichloroethyl phosphate intercalated expandable graphite, which is designated as EG1.

[0043] The particle size of EG1 was measured by laser particle size analyzer, and the median particle size D50 was 50 μm.

[0044] Incubate at different temperatures for 5 minutes to measure the volume of EG1. According to the volume-temperature curve, the expansion temperature of EG1 is 180°C; heat at 1000°C for 30 minutes to measure the volume of...

Embodiment 2

[0054] Preparation / source of tris(2-chloropropyl) phosphate intercalated expandable graphite EG2:

[0055] Place natural graphite with a median particle size D50 of 40um in a mixed solution of concentrated phosphoric acid-concentrated perchromic acid at a ratio of 1:1, stir for 30 minutes, filter and wash to PH=7.0 to obtain expandable graphite, and place the obtained expandable graphite in In the tris(2-chloropropyl) phosphate acetic acid mixture, pressurize to 50Mpa at 120°C, and stir at high speed with electromagnetic stirring for 10h, the obtained tris(2-chloropropyl) phosphate intercalated expandable graphite is denoted as EG2 .

[0056] The particle size of EG2 was measured by laser particle size analyzer, and the median particle size D50 was 50 μm.

[0057] Incubate at different temperatures for 5 minutes to measure the volume of EG2. According to the volume-temperature curve, the expansion temperature of EG2 is 200°C; heat at 1000°C for 30 minutes to measure the vol...

Embodiment 3

[0063] Preparation / source of trichloroethyl phosphate intercalated expandable graphite EG3:

[0064] Place natural graphite with a median particle size D50 of 30um in a mixed solution of concentrated phosphoric acid-concentrated perchromic acid at a ratio of 1:1, stir for 30 minutes, filter and wash to PH=7.0 to obtain expandable graphite, and place the obtained expandable graphite in In the mixture of trichloroethyl phosphate and acetic acid, the pressure was increased to 100Mpa at 120°C, and stirred at high speed by electromagnetic stirring for 10h. The obtained trichloroethyl phosphate intercalated expandable graphite was designated as EG3.

[0065] The particle size of EG3 was measured by laser particle size analyzer, and the median particle size D50 was 30 μm.

[0066] Incubate at different temperatures for 5 minutes to measure the volume of EG3. According to the volume-temperature curve, the expansion temperature of EG3 is 200°C; heat at 1000°C for 30 minutes, measure ...

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Abstract

The application discloses an anode diaphragm. The anode diaphragm is characterized by containing organic phosphorous intercalation expandable graphite. The anode diaphragm is used for a lithium ion battery, and good electric property of the lithium ion battery can be maintained while the security is greatly improved.

Description

technical field [0001] The application relates to a positive electrode membrane, a positive electrode membrane containing the positive electrode membrane and a lithium ion battery using the positive electrode membrane, belonging to the technical field of lithium ion batteries. Background technique [0002] Due to the characteristics of high energy density and high voltage of lithium-ion batteries, safety issues have always been an important and difficult issue in the field of lithium-ion battery research. [0003] When lithium-ion batteries are abused, especially when they are mechanically damaged by acupuncture, extrusion, impact, etc., local short-circuit points will be formed inside. Due to the characteristics of low impedance and high current discharge of lithium-ion batteries, the short-circuit point will pass through a large current instantaneously and generate a lot of heat, and the temperature of the short-circuit point can reach above 1500°C. Local high temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/13H01M4/628H01M10/0525Y02E60/10
Inventor 卢永强
Owner NINGDE AMPEREX TECH