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Negative electrode and lithium-ion battery containing the same

A negative, single-ion technology, applied in negative electrodes, battery electrodes, secondary batteries, etc., to solve problems such as explosions

Active Publication Date: 2021-08-03
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if a lithium-ion secondary battery produces dendrites on the negative electrode during charging, it may cause a short circuit and cause an explosion.

Method used

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  • Negative electrode and lithium-ion battery containing the same
  • Negative electrode and lithium-ion battery containing the same
  • Negative electrode and lithium-ion battery containing the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0059] Add 4 grams of styrene-ethylene / butadiene-styrene copolymer (SEBS polymer, purchased from Sigma-Aldrich) (28 wt% of styrene-derived repeating units) into a first reaction flask, and add 100 ml of 1 , 2-dichloroethane (dichloroethane, DCE) in the first reaction flask to dissolve the styrene-ethylene / butadiene-styrene copolymer. Next, it was heated to 40° C. and stirred for 1 hour under a nitrogen atmosphere. Add 7.6 ml of acetic anhydride to a second reaction flask. Next, 2.13 ml of sulfuric acid (sulfuric acid) was slowly added into the second reaction flask at 0°C. After stirring for 1 hour, acetyl sulfate was obtained. Next, slowly add the obtained acetyl sulfate into the first reaction flask. Next, the first reaction flask was heated to 80° C. and stirred for 8 hours under nitrogen atmosphere to obtain sulfonated styrene-ethylene / butadiene-styrene copolymer (SSEBS).

[0060] Next, 4 grams of sulfonated styrene-ethylene / butadiene-styrene copolymer was added to a r...

preparation example 2

[0063] Add 4 grams of styrene-ethylene / butadiene-styrene copolymer (SEBS polymer, purchased from Sigma-Aldrich) (weight average molecular weight is 718,000, styrene-derived repeating unit is 28 wt%) into a first reaction flask , and 100 ml of 1,2-dichloroethane (dichloroethane, DCE) was added into the first reaction flask to dissolve the styrene-ethylene / butadiene-styrene copolymer. Next, it was heated to 40° C. and stirred for 1 hour under a nitrogen atmosphere. Add 9.5 ml of acetic anhydride to a second reaction flask. Next, 2.66 ml of sulfuric acid (sulfuric acid) was slowly added into the second reaction flask at 0°C. After stirring for 1 hour, acetyl sulfate was obtained. Next, slowly add the obtained acetyl sulfate into the first reaction flask. Next, the first reaction flask was heated to 80° C. and stirred for 8 hours under nitrogen atmosphere to obtain sulfonated styrene-ethylene / butadiene-styrene copolymer (SSEBS).

[0064]Next, add 4 grams of sulfonated styrene-...

Embodiment 1

[0067] First, a copper foil (12 μm in thickness) having a lithium metal layer (100 μm in thickness) was provided. Next, 3.3 parts by weight of the lithiated sulfonated styrene-ethylene / butadiene-styrene copolymer (2) obtained in Preparation Example 2 were dissolved in tetrahydrofuran (THF) to obtain a first solution (with a solid content of 5 wt. %), and 83.3 parts by weight of alumina (Al 2 o 3 ) and 13.4 parts by weight of polyvinylidene fluoride-co-hexafluoropropylene (poly(vinylidene fluoride-co-hexafluoropropene), PVDF-HFP) (purchased from Sigma-Aldrich, weight average molecular weight of about 400,000) were dissolved in dimethyl A second solution (solid content 20 wt%) was obtained in dimethyl ether. Next, the first solution is mixed with the second solution, and coated on the lithium metal layer by a solvent casting method. After drying at 70° C. for half an hour, an electrode plate with a single ion-conducting layer ( 1 ) (about 2-3 μm in thickness) is obtained. Ne...

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Abstract

A negative electrode and a lithium ion battery containing it. The negative electrode includes: a lithium-containing electrode layer; and a single-ion conduction layer configured on the lithium-containing electrode layer. The single-ion conductive layer comprises an inorganic particle, a single-ion conductor polymer (single-ion conductor polymer) and a binder, wherein the single-ion conductor polymer has the first repeating unit of the structure shown in formula (I), the formula The second repeating unit of the structure shown in (II), the third repeating unit of the structure shown in formula (III) and the fourth repeating unit of the structure shown in formula (IV): wherein, R 1 for O ‑ m + , SO 3 ‑ m + , N(SO 2 F) ‑ m + , N(SO 2 CF 3 ) ‑ m + , N(SO 2 CF 2 CF 3 ) ‑ m + 、COO ‑ m + or PO 4 ‑ m + ; + for Li + 、Na + 、K + 、Cs + or a combination of the above; and R 2 for CH 3 、CH 2 CH 3 or CH 2 CH 2 OCH 2 CH 3 , and wherein the ratio of the weight of the inorganic particles to the weight of the single ion conducting polymer and the binder is 4:1 to 9:1, and the weight of the binder is to the weight of the single ion The weight ratio of the conductive polymer is 1:1˜9:1.

Description

technical field [0001] The invention specifically relates to a negative electrode and a lithium ion battery containing the same. Background technique [0002] Lithium-ion secondary batteries have become the mainstream of commercialized batteries, and are working towards lighter, thinner, smaller, higher energy density, longer life and safer directions. [0003] Dendrite growth is a phenomenon that occurs during battery charging whereby the active material (usually a metal such as zinc or lithium) is reduced from its oxidized state and deposited on a substrate. Depending on the charging conditions, the metal can be deposited in the form of a dendrite that penetrates the separator. Therefore, if a lithium-ion secondary battery produces dendrites on the negative electrode during charging, it may cause a short circuit and cause an explosion. [0004] Therefore, there is a need for a novel negative electrode applied to metal ion secondary batteries to solve the above problems. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/60H01M4/62H01M4/134H01M4/137H01M10/0525
CPCH01M4/134H01M4/137H01M4/60H01M4/621H01M4/667H01M10/0525B01J39/20C08F8/36C08F8/42C09D153/025H01M4/366H01M4/382H01M4/62H01M4/622Y02E60/10C08F8/12C08F297/04H01M4/628H01M2004/027
Inventor 吴伟新吴笙卉赵基扬刘昆霖方家振
Owner IND TECH RES INST