Positive electrode material of metal halide battery and preparation method thereof

A metal halide, alkali metal halide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of abnormal growth of electroactive metal particles, alkali metal halide, the actual utilization rate of electroactive metal element is not improved, Solve the problems of low utilization rate of electroactive metal element, and achieve the effect of solving low cycle life and stability, improving effective utilization rate and good battery stability

Inactive Publication Date: 2018-03-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, the actual utilization rate of the electroactive metal element is not improved, resulting in a low utilization rate of the electroactive metal element
In addition, excessive electroactive metal elements will increase the contact probability of metal particles in a medium-high temperature environment (usually 250-300 ° C), resulting in abnormal growth of electroactive metal particles and alkali metal halides during cycling, thereby reducing the battery life. cycle life
[0006] For this reason, the patent CN103178245A uses carbon black to partially replace Ni, which has a certain inhibitory effect on nickel and optimizes battery performance. However, due to the limited conductivity of carbon black, a large amount of addition is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, the preparation of positive electrode material is as follows:

[0026] (1) Mix ultrafine Ni and NaCl according to the molar ratio of 0.6, grind in alcohol, then add an appropriate amount of binder PVA or PVP, and pore-forming agent ammonium carbonate or ammonium bicarbonate, spray granulation, under 2mpa-5mpa After the preforming of the tablet, it is placed in a hydrogen atmosphere and calcined at a rate of 100°C / h to 700°C, and kept for 1h to obtain NaCl-Ni powder.

[0027] (2) Grinding the graphene to a particle size of 10 micrometers to 100 micrometers, and then keeping the temperature at 150° C. for 6 hours in a closed container with an inert atmosphere to obtain conductive ceramic powder.

[0028] (3) Physically mix NaCl-Ni powder, conductive ceramic powder and other additives by ball milling, wherein the mass ratio of NaCl-Ni powder to conductive ceramic powder is 10:1, so that the conductive ceramic powder is dispersed in the NaCl-Ni powder, ...

Embodiment 2

[0031] (1) Mix ultrafine NiO and NaCl according to the molar ratio of 1.05, grind them in alcohol, then add an appropriate amount of binder PVA or PVP, pore-forming agent ammonium carbonate or ammonium bicarbonate, spray granulation, and press down at 2mpa-5mpa After the sheet is preformed, it is placed in a hydrogen atmosphere and calcined at a rate of 100°C / h to 700°C, and kept for 1h to obtain NaCl-Ni powder.

[0032] (2) The porous two-dimensional sheet-like conductive ceramic Ti 2 C is ground to a particle size of 10 microns to 100 microns, and then kept at a constant temperature of 150° C. for 6 hours in a closed container with an inert atmosphere to obtain conductive ceramic powder.

[0033] (3) Physically mix NaCl-Ni powder, conductive ceramic powder and other additives by ball milling, wherein the mass ratio of NaCl-Ni powder to conductive ceramic powder is 5:1, so that the conductive ceramic powder is dispersed in the NaCl-Ni powder, Obtain positive electrode powder...

Embodiment 3

[0036](1) Mix superfine nickel oxalate and NaCl according to the molar ratio of 1.2, grind in alcohol, then add an appropriate amount of binder PVA or PVP, and pore-forming agent ammonium carbonate or ammonium bicarbonate, spray granulation, at 2mpa-5mpa After the lower tablet is preformed, it is placed in a hydrogen atmosphere and calcined at a rate of 100°C / h to 700°C, and kept for 1h to obtain NaCl-Ni powder.

[0037] (2) Combining graphene with porous two-dimensional sheet-like conductive ceramic Ti 2 C is ground to a particle size of 10 microns to 100 microns, and then kept at a constant temperature of 150° C. for 6 hours in a closed container with an inert atmosphere to obtain conductive ceramic powder.

[0038] (3) Physically mix NaCl-Ni powder, conductive ceramic powder and other additives by ball milling, wherein the mass ratio of NaCl-Ni powder to conductive ceramic powder is 15:1, so that the conductive ceramic powder is dispersed in the NaCl-Ni powder, Obtain posi...

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PUM

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Abstract

The invention provides a positive electrode material of a metal halide battery. The positive electrode material of the metal halide battery is characterized in that a two-dimensional flaky material graphene and / or MXene are / is introduced into the positive electrode material of an existing metal halide battery in order to replace part of excessive electro-active metal. According to the positive electrode material of the metal halide battery, the replaced substance is introduced, so that the quantity of added electro-active metal in positive electrode components is decreased; and moreover, the replaced substance is good in heat and electricity conducting performances, so that high electricity and heat conducting performances are kept in a positive electrode cavity of the battery at medium- and low-temperature of 150-250 DEG C, and as a result, the effective utilization rate of the electro-active metal is increased; and meanwhile, the contact probability of electro-active metal particlesis decreased, so that the abnormal growth of the electro-active metal particles and alkali halide in circulating process can be inhibited, and as a result, the cycle life of the battery is obviously prolonged.

Description

technical field [0001] The invention relates to the technical field of metal halide batteries, in particular to a positive electrode material of a metal halide battery and a preparation method thereof. Background technique [0002] Metal halide batteries, including Sodium-Metal Halide Batteries and the like, are useful in many energy storage applications. In addition to the anode, this type of battery also includes a positive electrode (or called a cathode) that supplies / receives electrons during charging / discharging of the battery. Wherein the positive electrode material comprises at least one electroactive metal and at least one alkali metal halide. [0003] Sodium-Metal Halide Batteries (Sodium-Metal Halide Batteries) is a new type of secondary battery with low cost, safety and environmental protection, high specific energy, in which β”-Al 2 o 3 (Sodium ion fast ion conductor) is a solid electrolyte, other sodium molten salts are liquid electrolytes, the negative elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/38
CPCH01M4/62H01M4/628H01M10/38Y02E60/10Y02P70/50
Inventor 王建新徐冲王成田官万兵
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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