Special modified negative pole material for thermal battery and preparation method thereof

A negative electrode material and thermal battery technology, applied to battery electrodes, primary battery electrodes, circuits, etc., can solve problems such as long activation time, difficulty in further improving the specific energy of thermal batteries, and voltage pits, etc., to achieve compatibility Good, small electric polarization, high voltage accuracy effect

Inactive Publication Date: 2011-08-10
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiSi alloy has been widely used as the negative electrode material of thermal battery, but the mass percentage content of lithium in LiB alloy is as high as 68%-70% compared with the new material, and the mass percentage content of lithium in LiSi alloy is only 42.5%-45.5%. The amount of lithium is moderate, and the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0010] Example 1

[0011] Add 95 grams of LiSi alloy powder and 5 grams of LiCl-LiBr-LiF molten salt eutectic to the container, under inert atmosphere and dry environmental protection, after mechanical mixing, pass through a 60-mesh sieve 10 times, and ball mill for 30 minutes to obtain a special modified negative electrode Material, set aside after bottling. In the LiCl-LiBr-LiF molten salt eutectic used in this embodiment, the content of lithium chloride is 19%, the content of lithium bromide is 71%, and the content of lithium fluoride is 10%.

Example Embodiment

[0012] Example 2

[0013] Add 96 grams of LiSi alloy powder and 4 grams of LiCl-LiBr-LiF molten salt eutectic to the container. Under inert atmosphere and dry environment, pass through a 60-mesh sieve 8 times after mechanical mixing. After 20 minutes of ball milling, a special modified negative electrode is obtained. Material, set aside after bottling. In the LiCl-LiBr-LiF molten salt eutectic used in this embodiment, the content of lithium chloride is 25%, the content of lithium bromide is 65%, and the content of lithium fluoride is 10%.

Example Embodiment

[0014] Example 3

[0015] Add 97 grams of LiSi alloy powder and 3 grams of LiCl-LiBr-LiF molten salt eutectic to the container, mix mechanically and pass through a 60-mesh sieve 5 times under inert atmosphere and dry environmental protection. After ball milling for 25 minutes, a special modified negative electrode is obtained. Material, set aside after bottling. In the LiCl-LiBr-LiF molten salt eutectic used in this embodiment, the content of lithium chloride is 22%, the content of lithium bromide is 66%, and the content of lithium fluoride is 12%.

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PUM

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Abstract

The invention discloses a special modified negative pole material for a thermal battery. The special modified negative pole material is powder material comprising LiSi alloy and molten salt eutectoid, the LiSi alloy is 95-98% by the weight, the molten salt eutectoid is 2-5% by weight, and the molten salt eutectoid is in a lithium chloride-potassium bromide-lithium fluoride system. The surface structure of the LiSi alloy is modified by adding the molten salt eutectoid, thereby further enhancing the compatibility between the LiSi alloy and isolation material for the thermal battery, expanding a diffusion channel of lithium ions and further improving the high-power transient output capability of the thermal battery. The special modified negative pole material is mainly applied in the high-power transient output thermal battery. In addition, the invention further discloses a preparation method of the special modified material for the thermal battery.

Description

technical field [0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a special modified negative electrode material for thermal batteries; in addition, the invention also relates to a preparation method of the negative electrode material. Background technique [0002] The thermal battery is a kind of thermally activated reserve battery that uses the heating system of the battery itself to heat and melt the non-conductive solid-state salt electrolyte into an ionic conductor and enter the working state. The internal electrolyte of the thermal battery is a eutectic melt composed of two or more inorganic salts. At room temperature, the electrolyte is a non-conductive solid; when in use, the electric ignition head inside the battery is ignited by an external current, thereby igniting the heating inside the battery. materials, the internal temperature of the battery rises rapidly, causing the molten salt electrolyte to melt and con...

Claims

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Application Information

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IPC IPC(8): H01M4/08H01M4/58
CPCY02E60/12
Inventor 高俊丽迟亮郑要武胡冉
Owner SHANGHAI INST OF SPACE POWER SOURCES
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