Primary fluorinated carbon lithium battery and preparation method thereof

A carbon fluoride and carbon fluoride technology, which is applied in the field of lithium carbon fluoride primary battery and its preparation, can solve the problems of large discharge expansion, low conductivity of carbon fluoride electrodes, poor formability, etc., and achieve improved electrode performance. Electrical conductivity, more effective solid-liquid interfaces, and the effect of improving ion conductivity

Inactive Publication Date: 2013-03-27
天津蓝天特种电源科技股份公司
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  • Application Information

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Problems solved by technology

[0006] At present, factors such as low conductivity of fluorinated carbon electrodes, slightly lower discharge voltage platform, low main material content, large discharge expansion, and large liquid injection volume are the main reasons for the low specific energy (including weight ratio and volume specific energy) of the battery.
In order to improve the conductivity of the electrode, fluorinated carbon nanotubes are generally used as the positive electrode material, and its conductivity is improved. However, due to the serious agglomeration and low density of the nanomaterials, the proportion of the binder in the preparation of the electrode is high, and the formability is not good. Well, the material content per unit volume is low, the volume specific energy of the prepared lithium carbon fluoride battery is too low, and the preparation process is complicated, the material cost is high, and it is not suitable for mass promotion and application
[0007] A mixture of fluorinated graphite and fluorinated carbon nanotubes is used as the positive electrode. Although this method can reduce the agglomeration between materials, increase the electrical conductivity of the material and thus improve the rate performance, it requires ball milling and mixing, and the preparation process is complicated and the cost is low. High, and the volume specific energy is not ideal
[0008] As we all know, the higher the fluorine content in fluorinated carbon materials, the higher its theoretical gram capacity, but its electrical conductivity decreases, insulation increases, and the actual capacity decreases, which limits the application effect of materials with high fluorine content
However, there are still no good solutions to other problems that lead to low specific energy, so the specific energy level of the existing carbon fluoride lithium battery is low.

Method used

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  • Primary fluorinated carbon lithium battery and preparation method thereof
  • Primary fluorinated carbon lithium battery and preparation method thereof

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preparation example Construction

[0049] The preparation method of lithium carbon fluoride primary battery of the present invention is as follows:

[0050] 1. Preparation of positive electrode sheet:

[0051] (1) Use ethanol as a dispersant, add fluorocarbons and conductive additives in sequence, and stir with a planetary mixer for 0.3h~5h to fully infiltrate and mix with ethanol, then add PTFE at 50°C~80°C (PTFE) mixed with deionized water, stirred for 2-10 minutes to obtain positive electrode dough;

[0052] (2) Put the positive electrode dough in a sealed bag and place it in an oven at 40°C~80°C for 1~5h;

[0053] (3) Use a rolling machine to repeatedly roll the positive electrode mass to obtain a sheet-shaped pole piece. The temperature of the two rolling rollers is controlled at 30°C to 80°C;

[0054] (4) Dry the flake pole piece at room temperature for 4~24h, then move it into a constant temperature box at 50°C~150°C and dry it for 2~10h;

[0055] (5) Cut the dried flaky pole piece into small pieces; ...

Embodiment 1

[0070] The positive electrode uses F / C=1 fluorinated carbon CF (fluorine content is 61.3%) as the active material, and the positive electrode formula is CF: acetylene black: conductive carbon black: nano-carbon fiber: PTFE=84:3:3:3:7 ( Weight ratio), using 0.3mm thick aluminum mesh, the total thickness of the combined piece is 0.7±0.02mm, and the size of the pole piece is 55mm wide x 120mm long. Vacuum drying is performed on the positive electrode sheet, and the drying parameter is 150° C. for 48 hours.

[0071] The negative electrode adopts metal lithium sheet with a purity of ≥99.9%, and the size is 0.23mm thick × 55mm wide × 120mm long; after the 0.1mm thick stainless steel mesh is pressed with the lithium sheet, the thickness of the double-sided lithium negative electrode is 0.48mm, and the thickness of the single-sided lithium negative electrode 0.27mm thick.

[0072] The positive and negative electrodes were made into bags with 0.1 mm thick non-woven fabric and 0.025 mm...

Embodiment 2

[0081] The positive electrode uses F / C=1 fluorinated carbon CF (fluorine content is 61.3%) as the active material, and the positive electrode formula is CF: acetylene black: conductive carbon black: nano-carbon fiber: PTFE=81:3:4:5:7 ( Weight ratio), using 0.3mm thick aluminum mesh, the total thickness of the combined piece is 0.45±0.02mm, and the pole piece size is 55mm wide x 120mm long. Vacuum-dry the positive electrode sheet with a drying parameter of 150° C. for 48 hours.

[0082] The negative electrode adopts a lithium sheet with a purity ≥ 99.9%, and the size is 0.14mm thick × 55mm wide × 120mm long; after pressing the lithium sheet with a 0.1mm thick stainless steel mesh, the thickness of the double-sided lithium negative electrode is 0.33mm, and the thickness of the single-sided lithium negative electrode is 0.18mm. mm thick.

[0083] A 0.025 mm polypropylene separator was used to make the negative electrode sheet into a bag, and the width of the separator after bag ...

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Abstract

The invention discloses a primary fluorinated carbon lithium battery and a preparation method thereof. The battery comprises a positive electrode, a negative electrode with metallic lithium as active materials, diaphragms, a non-aqueous electrolyte, pole lugs and a case, wherein the positive electrode comprises fluorinated carbon active materials and electric conduction additives, and the non-aqueous electrolyte comprises one component of lithium tetrafluoroborate (LIBF4), propylene carbonate(PC), 1,2dimethoxyethane (DME), gamma-butyrolactone (BL), dimethyl tetrahydrofuran (2Me-THF) and dioxolane (DOL). According to the primary fluorinated carbon lithium battery, the positive electrode is made of fluorinated carbon material with high fluoride content, various electric conduction additives are used for improving electric conductivity of the electrodes, and the electrolyte is low in viscosity, good in liquidity, and large in quantity of solid liquid interfaces, so that conductivity of the solid liquid interfaces and ions can be improved effectively, a liquid injection volume is reduced, electric discharge with different rates from 50h-rate to 5h-rate can be achieved, gravimetric specific energy of the battery achieves 400-610Wh / kg, and volumetric specific energy of the battery achieves 700-950Wh / L. Furthermore, the primary fluorinated carbon lithium battery is strong in processing property, and suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium carbon fluoride primary battery using carbon fluoride as a positive electrode active material and a preparation method thereof. Background technique [0002] Lithium / carbon fluoride (Li / CFx) battery is a solid cathode lithium primary battery that was first commercialized. Because of its theoretical mass specific energy of 2180Wh / kg, which is the highest in the positive electrode series, it has good high temperature performance and safety performance, high and stable discharge platform, and low self-discharge rate, so it has always received great attention. It also occupies a considerable market, such as the civilian field: it can be used as watches, calculators, electronic toys, fishing batteries, electronic instruments, backup power supplies for notebook computers, memory power supplies on various devices, and small medical equipment; larger cylinders Shaped and squ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/14H01M4/06H01M4/62H01M4/08
CPCY02E60/12
Inventor 阳晓霞段征王希文高俊奎李贺
Owner 天津蓝天特种电源科技股份公司
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