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Construction method of novel ion channel for positive electrode of lithium metal battery

A lithium metal battery and ion channel technology, applied in electrode manufacturing, battery electrodes, positive electrodes, etc., can solve problems such as low energy density, increase the reaction degree of active materials inside the electrode and electrolyte, and increase the difficulty of electrolyte infiltration, etc., to achieve The effect of improved magnification performance, low cost, and simple method

Pending Publication Date: 2022-03-18
浙江极海供能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the theoretical energy of lithium metal batteries is high, in order to exert high actual energy in a single battery, the thickness of the positive electrode sheet must be increased to increase the loading capacity of the positive electrode active material. However, when the thickness of the positive electrode sheet increases Finally, the infiltration difficulty of the electrolyte will be greatly increased, causing most of the active materials in the positive electrode to be unable to participate in the discharge reaction, and finally only a lower energy density can be obtained. Therefore, in order to improve the utilization of the positive electrode active materials, obtain a For lithium metal batteries, it is necessary to build ion channels on the positive electrode to increase the reactivity of the active material inside the electrode and the electrolyte.

Method used

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  • Construction method of novel ion channel for positive electrode of lithium metal battery
  • Construction method of novel ion channel for positive electrode of lithium metal battery
  • Construction method of novel ion channel for positive electrode of lithium metal battery

Examples

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Embodiment 1

[0019] Embodiment 1. A method for constructing ion channels of a positive electrode thick pole piece of a lithium-carbon fluoride battery by using undoped elemental S as a pore-forming agent. CFx dry powder (13.05g), KB dry powder (0.375g), CNT dry powder (0.375g), weighed and put into a mixer (THINKYMIXER), and added 30.36ml of ethanol, weighed and recorded the overall weight, at 2000r / min Stir at a rotating speed for 10 minutes, then defoam for 1 minute; add ethanol to the same weight, stir at a rotating speed of 2000r / min for 10 minutes, and perform defoaming for 1 minute; Stir at low temperature for 10 minutes, then defoam for 1 minute. After the stirring is completed, prepare a uniform slurry, add 2g of PTFE mixture (solid content 60%, that is, the actual PTFE content is 1.2g), and stir with a glass rod to make a jelly shape, start to process the pole piece precursor. After roll forming, use a rolling machine to roll from 2000 μm to a single-layer pole piece thickness of...

Embodiment 2

[0022] Example 2. A method for constructing ion channels on the positive thick electrode sheet of a lithium-carbon fluoride battery by doping 5wt.% elemental S as a pore-forming agent. Weigh CFx dry powder (13.05g), KB dry powder (0.375g), CNT dry powder (0.375g), elemental S dry powder (0.75g) and put them into THINKY MIXER, add 32.01ml of ethanol, weigh and record the overall weight . Stir at a rotating speed of 2000r / min for 10min, then defoam for 1min; add ethanol to the same weight, stir for 10min at a rotating speed of 2000r / min, and defoam for 1min; add ethanol to the same weight, Stir for 10 min at a rotational speed of 2000 r / min, and then perform defoaming for 1 min. After the stirring is completed, a uniformly mixed slurry is obtained. Add 2g of PTFE mixture (solid content 60%, that is, the actual PTFE content is 1.2g), stir with a glass rod to make a jelly shape, and start processing the electrode precursor. After roll forming, use a rolling machine to roll from ...

Embodiment 3

[0025] Example 3. A method for constructing ion channels on the positive thick electrode sheet of a lithium-carbon fluoride battery by doping with 10wt.% elemental S as a pore-forming agent. Weigh CFx dry powder (13.05g), KB dry powder (0.375g), CNT dry powder (0.375g) and elemental S dry powder (1.5g) into THINKY MIXER, add 33.66ml of ethanol, weigh and record the overall weight . Stir at a rotating speed of 2000r / min for 10min, then defoam for 1min; add ethanol to the same weight, stir for 10min at a rotating speed of 2000r / min, and defoam for 1min; add ethanol to the same weight, Stir for 10 min at a rotational speed of 2000 r / min, and then perform defoaming for 1 min. After the stirring is completed, a uniformly mixed slurry is obtained. Add 2g of PTFE mixture (solid content 60%, that is, the actual PTFE content is 1.2g), stir with a glass rod to make a jelly shape, and start processing the electrode precursor. After roll forming, use a rolling machine to roll from 2000 ...

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Abstract

According to the construction method of the novel ion channel for the positive electrode of the lithium metal battery provided by the invention, a pore-forming agent S elementary substance is introduced in the preparation process of the positive electrode plate, and is heated and sublimated to leave the ion channel with a proper pore diameter in a thick electrode plate; the preparation method plays an important role in improving the ion transmission efficiency in battery reaction, and the electrode material subjected to pore-forming treatment can generate pore channels with relatively large specific surface area and proper pore diameters, so that the battery reaction efficiency is remarkably improved. The invention aims to reform the structure of the battery pole piece by using a cheap pore-forming material and combining simple heat treatment, so that the utilization efficiency of active substances in the electrode is remarkably improved, and the total energy density of the battery is improved.

Description

technical field [0001] The invention relates to a method for constructing a novel ion channel for the positive electrode of a lithium metal battery. Background technique [0002] The battery with metal lithium as the negative electrode is called lithium metal battery. Compared with lithium ion battery, it has obvious advantages in energy density and has good application prospects. As a typical lithium metal battery, the positive electrode of lithium-carbon fluoride battery The theoretical mass specific capacity and theoretical mass specific energy of the material reached 865 mAh / g and 2189 Wh / kg, respectively, much higher than commercial lithium-ion batteries. [0003] Although the theoretical energy of lithium metal batteries is high, in order to exert high actual energy in a single battery, the thickness of the positive electrode sheet must be increased to increase the loading capacity of the positive electrode active material. However, when the thickness of the positive e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M4/62
CPCH01M4/139H01M4/0471H01M4/0435H01M4/62H01M2004/028H01M2004/021Y02E60/10
Inventor 林轩民尹志文
Owner 浙江极海供能装备有限公司