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Positive pole of lithium manganese battery

A lithium-manganese battery and positive electrode technology, applied in the field of electrochemistry, can solve the problems of uneven discharge voltage curve, affecting wide application, low battery capacity and high current output performance, and achieve the effect of increased capacity and stable discharge voltage

Inactive Publication Date: 2009-12-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The disadvantages of existing lithium batteries are that the battery capacity and high current output performance are low, and the discharge voltage curve is not flat, which seriously affects its wide application.

Method used

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  • Positive pole of lithium manganese battery
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  • Positive pole of lithium manganese battery

Examples

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Effect test

example 1

[0017] Example 1: Manganese dioxide: graphite: polytetrafluoroethylene: fluorinated carbon fiber (the mass content of fluorine is 40%)=1: 0.06: 0.05: 0.01 is fully mixed, granulated, rolled, and prepared as positive electrode. With lithium metal as the negative electrode, the separator is Celgard 2300, 1mol / L lithium perchlorate (LiClO 4 ) / propylene carbonate (PC)+ethylene glycol dimethyl ether (DEC) (volume ratio 1:1) as the electrolyte, and assembled into a CR123A lithium battery in an argon glove box. The battery adopts constant current discharge, the discharge cut-off voltage is 2.0V, and the discharge performance test is performed in an environment of 23±2°C. Discharge curve such as Figure 3 song line a.

example 2

[0018] Example 2: Manganese dioxide: graphite: polytetrafluoroethylene: graphite fluoride (the mass content of fluorine is 65%)=1: 0.07: 0.07: 0.05 is fully mixed, granulated, rolled, and prepared as positive electrode. Use metal lithium as the negative electrode, the separator is Celgard 2300, 1mol / L LiClO 4 / PC+DMC (volume ratio 1:1) was used as the electrolyte, and a CR123A lithium battery was assembled in an argon glove box. The battery adopts constant current discharge, the discharge cut-off voltage is 2.0V, and the discharge performance test is performed in an environment of 23±2°C. Discharge curve such as Figure 3 song line b

example 3

[0019] Example 3: Manganese dioxide: graphite: polytetrafluoroethylene: fluorinated carbon nanotubes (the mass content of fluorine is 35%)=1: 0.08: 0.06: 0.15 is fully mixed, granulated, rolled, and prepared as Positive electrode, lithium metal as negative electrode, Celgard 2300 separator, 1mol / L LiClO 4 / PC+DMC (volume ratio 1:1) was used as the electrolyte, and a CR123A lithium battery was assembled in an argon glove box. The battery adopts constant current discharge, the discharge cut-off voltage is 2.0V, and the discharge performance test is performed in an environment of 23±2°C. Discharge curve such as Figure 3 song line c

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Abstract

The invention relates to a positive pole of a lithium manganese battery, which comprises active substances of the positive pole, namely manganese dioxide, graphite, polyfluortetraethylene and a fluorocarbon material, wherein the ratio of the contents of the manganese dioxide to the graphite to the polyfluortetraethylene to the fluorocarbon material is equal to 1:(0.06-0.08):(0.05-0.08):(0.01-0.3) according to the mass ratio. The cathodic formula greatly improves the capacity and high-current discharge capability of lithium batteries, and is particularly suitable for being taken as a driving power supply of digital products.

Description

technical field [0001] The invention belongs to battery material preparation technology, in particular to a positive electrode material additive for improving battery capacity and high-current discharge capability, and belongs to the field of electrochemistry. Background technique [0002] With the development of electronic information technology, all aspects of battery performance are required to be greatly improved, especially the requirements for battery discharge capacity and power density are getting higher and higher. [0003] The disadvantages of existing lithium batteries are that the battery capacity and high current output performance are low, and the discharge voltage curve is not flat, which seriously affects its wide application. [0004] The purpose of the present invention is to avoid the deficiencies in the prior art, and propose a lithium battery with high energy and high power. This battery has a long discharge time and a large discharge current, and is sui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02
CPCY02E60/12Y02E60/10
Inventor 汪浩胡晨卢祥军严辉
Owner BEIJING UNIV OF TECH
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