Positive electrode composite material for lithium primary battery and preparation method thereof

A composite material and positive electrode technology, applied in the field of positive electrode composite materials for lithium primary batteries and their preparation, can solve the problems of poor battery rate performance, voltage hysteresis of fluorocarbon batteries, weak electrical conductivity, etc., and achieve outstanding substantive characteristics, The effect of good discharge rate performance and low cost

Active Publication Date: 2021-08-20
NORTHWEST INST OF NUCLEAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a positive electrode composite material for a lithium primary battery and its preparation method, to solve the technical problem of weak electrical conductivity of carbon fluoride as the positive electrode active material of a lithium / carbon fluoride battery, and to solve the voltage hysteresis of a carbon fluoride battery , technical problems of poor battery rate performance

Method used

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  • Positive electrode composite material for lithium primary battery and preparation method thereof
  • Positive electrode composite material for lithium primary battery and preparation method thereof
  • Positive electrode composite material for lithium primary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put the pre-treated graphite powder 10.0g into the reactor, access NF 3 Volume score 100% NF 3 Gas, keep NF 3 The pressure is 100 kPa, the reactor is heated and the reaction temperature is maintained at 400 ° C, and the reaction is 8 h. The reactor was naturally cooled to remove the product, which was treated in vacuo at 200 ° C for 6 hours to give fluorinated graphite.

[0033] Put the pre-treated Cosa black powder 5.0g into the reactor, access NF 3 Volume score 100% NF 3 Gas, keep NF 3The pressure was 100 kPa, heated the reactor and maintaining the reaction temperature at 500 ° C, and the reaction was 8 hours. After the reactor was naturally cooled, the product was taken out and treated in vacuo at 200 ° C for 6 hours to give fluoride black.

[0034] The resulting fluorinated graphite and the fluorinated core were placed in a ball mill according to the mass ratio of 1: 0.01, and the ball milling speed was 50 rpm, ball milling 48h, resulting in a positive electrode composi...

Embodiment 2

[0036] Put the pre-treated graphite powder 10.0g into the reactor, access NF 3 NF of 90% volume fraction 3 Gas, keep NF 3 The pressure was 120 kPa, the reactor and the reaction temperature were maintained at 500 ° C, and the reaction was 10 h. The reactor was naturally cooled to remove the product, which was treated in vacuo at 200 ° C for 6 hours to give fluorinated graphite.

[0037] Put the pre-treated Cosa black powder 5.0g into the reactor, access NF 3 Volume score 100% NF 3 Gas, keep NF 3 The pressure was 120 kPa, heated the reactor and maintaining the reaction temperature at 400 ° C, and the reaction was 8 h. After the reactor was naturally cooled, the product was taken out and treated in vacuo at 200 ° C for 6 hours to give fluoride black.

[0038] The resulting fluorinated graphite and fluorinated core were placed in a ball mill according to the mass ratio of 1: 0.1, and the ball milling speed was 120 rpm, ball milling 12h, gave a positive electrode composite.

Embodiment 3

[0040] Put 10.0g of the preprocessed mesh carbon powder into the reactor, access NF 3 Summer score of 60% NF 3 Gas, keep NF 3 The pressure was 200 kPa, heated the reactor and maintaining the reaction temperature at 600 ° C, and the reaction was 12 h. The reactor was naturally cooled to remove the product, which was treated with a vacuum treatment at 200 ° C for 6 hours to obtain a fluorinated mesoporous carbon.

[0041] Put the pre-treated Cosa black powder 5.0g into the reactor, access NF 3 Volume score 100% NF 3 Gas, keep NF 3 The pressure was at 300 kPa, the reactor was heated and the reaction temperature was maintained at 450 ° C, and the reaction was 12 h. After the reactor was naturally cooled, the product was taken out and treated in vacuo at 200 ° C for 6 hours to give fluoride black.

[0042] The resulting fluorinated mesoporous carbon with fluorinated core is placed in a ball mill according to the mass ratio of 1: 0.3, and the ball milling speed is 400 rpm, ball milling ...

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Abstract

The invention belongs to the technical field of lithium primary battery positive electrode materials, and provides a positive electrode composite material for a lithium primary battery and a preparation method. The positive electrode composite material provided by the invention comprises a carbon fluoride material with high graphitization degree and a fluorinated ketjen black material; the positive electrode composite material is prepared by ball-milling and mixing a high-graphitization-degree carbon fluoride material and a fluorinated ketjen black material; the ball milling time is 8-48 hours, and the mass ratio range is (1: 0.01)-(1: 0.3). The positive electrode composite material obtained by mixing and ball-milling the fluorinated carbon material with high graphitization degree and the fluorinated ketjen black material combines the advantages of the two materials, so that the conductivity of the positive electrode material is improved, and the impedance of charge transfer is effectively reduced. According to the lithium primary battery prepared from the positive electrode composite material, the preparation process of the positive electrode material of the battery is simple, the discharge rate performance of the battery is improved, the voltage hysteresis phenomenon in the discharge process of the battery is effectively improved, and the overall discharge performance of the material is improved.

Description

Technical field [0001] The present invention belongs to the preparation of a lithium primary battery positive electrode material and a fluorocarbon battery positive material, and is specifically related to a positive electrode composite material for a lithium primary battery and a preparation method thereof. Background technique [0002] Fluorinated carbon is used as a lithium primary battery positive electrode material, theoretical mass is more than 2180Wh / kg (lithium / thionyl chloride): 1470Wh / kg, lithium / manganese dioxide battery: 1005WH / kg), is the highest in energy than energy Commercial lithium primary battery. Lithium / fluorinated carbon battery (Li / (CF x ) n The system has the high storage density (> 500WH / kg), the self-discharge is extremely slow (the survival year is more than 10 years), the discharge voltage is stable, the application temperature range is wide (-40 ° C ~ 100 ° C), safe and stable, etc. Currently widely used in electronic radio frequenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M6/16C01B32/10
CPCH01M4/5835H01M4/364H01M6/16C01B32/10Y02E60/10
Inventor 姜胜波黄萍卢嘉春刘志超
Owner NORTHWEST INST OF NUCLEAR TECH
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