Carbon fluoride composite positive active material for lithium-carbon fluoride battery as well as preparation method and application of carbon fluoride composite positive active material

A carbon fluoride battery, the technology of using carbon fluoride, applied in the direction of carbon fluoride, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of high rate performance voltage lag, difficult to take into account high specific capacity and other problems, and achieve polarization phenomenon The effect of reducing and improving battery rate performance and low production cost

Pending Publication Date: 2021-08-24
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 solve the technical problem that existing carbon fluoride positive electrode active materials for lithium-carbon fluoride batteries are difficult to balance high specific capacity, high rate performance and voltage hysteresis, and to provide a lithium-carbon fluoride battery. Carbon fluoride composite positive electrode active material and its preparation method and application

Method used

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  • Carbon fluoride composite positive active material for lithium-carbon fluoride battery as well as preparation method and application of carbon fluoride composite positive active material
  • Carbon fluoride composite positive active material for lithium-carbon fluoride battery as well as preparation method and application of carbon fluoride composite positive active material
  • Carbon fluoride composite positive active material for lithium-carbon fluoride battery as well as preparation method and application of carbon fluoride composite positive active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1.1) Place 10.0 g of the pretreated graphite powder in an airtight container, and pour a fluorinated reagent into the airtight container, and the fluorinated reagent is 100% NF 3 gas; the material of the heated part of the airtight container is pure nickel, and the material of the rest of the container is stainless steel;

[0039] 1.2) Keep the pressure in the airtight container at 120Kpa and 500℃, and heat for 8h;

[0040] 1.3) After the reaction, the temperature in the airtight container is lowered to room temperature, and the product is taken out and vacuum-dried at 200° C. for 6 hours to obtain carbon fluoride;

[0041] 2) put carbon fluoride and ketjen black into a ball mill tank according to the mixing mass ratio of 1:0.02 and carry out ball milling mixing, the ball milling time is 24h, and the ball mill rotating speed is 100 rev / min, to obtain a well-mixed mixture of ketjen black. Fluorocarbon composites.

Embodiment 2

[0043] 1.1) Place 10.0 g of the pretreated graphite powder in an airtight container, and pass a fluorinating reagent into the airtight container, and the fluorinating reagent is 90% NF 3 gas; the material of the heated part of the airtight container is pure nickel, and the material of the rest of the container is stainless steel;

[0044] 1.2) Keep the pressure in the airtight container at 140Kpa and 500℃, and heat for 10h;

[0045] 1.3) After the reaction, the temperature in the airtight container is lowered to room temperature, and the product is taken out and vacuum-dried at 200° C. for 6 hours to obtain carbon fluoride;

[0046] 2) put carbon fluoride and ketjen black into the ball mill tank according to the mixing mass ratio of 1:0.05 and carry out ball milling mixing, the ball milling time is 12h, and the ball mill rotating speed is 300 rev / min, to obtain uniformly mixed with Ketjen black. Fluorocarbon composites.

Embodiment 3

[0048] 1.1) Place 10.0 g of the pretreated graphite powder in an airtight container, and pass a fluorinating reagent into the airtight container, and the fluorinating reagent is 80% NF 3 gas; the material of the heated part of the airtight container is pure nickel, and the material of the rest of the container is stainless steel;

[0049] 1.2) Keep the pressure in the airtight container at 140Kpa and 500℃, and heat for 8h;

[0050] 1.3) After the reaction, the temperature in the airtight container is lowered to room temperature, and the product is taken out and vacuum-dried at 200° C. for 6 hours to obtain carbon fluoride;

[0051] 2) put carbon fluoride and ketjen black into the ball mill tank according to the mixing mass ratio of 1:0.03 and carry out ball milling mixing, the ball milling time is 24h, and the ball mill rotating speed is 200 rev / min, to obtain the homogeneous mixture mixed with ketjen black. Fluorocarbon composites.

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Abstract

The invention relates to a carbon fluoride composite positive active material for a lithium-carbon fluoride battery as well as a preparation method and application of the carbon fluoride composite positive active material. The invention aims to solve the technical problem that it is difficult for an existing carbon fluoride composite positive electrode active material for the lithium-carbon fluoride battery to simultaneously consider high specific capacity, high rate capability and improvement of voltage hysteresis phenomenon. The material is prepared by ball-milling and mixing carbon fluoride and ketjen black, and the mixing mass ratio of the carbon fluoride to the ketjen black is (1: 0.01)-(1: 0.1). The preparation method comprises the following steps: 1) preparing carbon fluoride by adopting a gas phase fluorination method; and 2) mixing the carbon fluoride and the ketjen black through ball milling to obtain the uniformly mixed carbon fluoride composite material mixed with the ketjen black. When the carbon fluoride composite positive electrode active material is applied to the carbon fluoride composite positive electrode active material for the lithium-carbon fluoride battery, relatively high specific capacity can be reserved, the rate capability can be improved, the discharge rate can reach 6C, and the voltage hysteresis phenomenon at the initial stage of discharge can be improved.

Description

technical field [0001] The invention relates to a positive electrode active material for a lithium-carbon fluoride battery, in particular to a carbon fluoride composite positive electrode active material for a lithium-carbon fluoride battery, a preparation method and an application thereof. Background technique [0002] At present, the lithium-carbon fluoride battery in the lithium primary battery has the highest energy storage density, which can reach more than 500Wh / kg, and its annual self-discharge rate is less than 1%. It has excellent storage performance and is currently the safest. Lithium battery. Therefore, this lithium-carbon fluoride battery with high specific energy, high safety, and long storage life is considered to be the main product of primary batteries in the future. [0003] As the active material of the positive electrode material of lithium-carbon fluoride battery, the performance of carbon fluoride material directly determines the performance of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/587H01M4/62H01M6/16C01B32/10
CPCH01M4/5835H01M4/587H01M4/625H01M6/16C01B32/10C01P2006/40
Inventor 姜胜波黄萍卢嘉春刘志超
Owner NORTHWEST INST OF NUCLEAR TECH
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