Electrode binder, cathode electrode material and lithium ion battery

Patent metadata

Field	Value
Publication number	US-2017226291-A1
Application number	US-201715498810-A
Country	US
Kind code	A1
Filing date	Apr 27, 2017
Priority date	Oct 29, 2014
Publication date	Aug 10, 2017
Grant date	—

Abstract

An electrode binder, a cathode electrode material, and a lithium ion battery are disclosed. The electrode binder includes a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer. The cathode electrode material includes a cathode active material, a conducting agent, and the electrode binder. The lithium ion battery includes an anode electrode, an electrolyte, a separator, and the cathode electrode, the cathode electrode comprising a cathode active material, a conducting agent, and the electrode binder.

First claim

What is claimed is:

1 . An electrode binder of a lithium ion battery, the electrode binder comprising a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer, wherein the dianhydride monomer comprises a monomer selected from the group consisting of monomers represented by formulas I, II, III, and combinations thereof, the diamine monomer comprises a first monomer represented by formula IV,

2 . The electrode binder of claim 1 , wherein the R in formula III is selected from the group consisting of bisphenol A unit, —O—, —S—, and —CH 2 —.

3 . The electrode binder of claim 1 , wherein the dianhydride monomer is selected from the group consisting of 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride), 2,3,3′,4′-diphenyl ether tetracarboxylic acid dianhydride, 1,2,4,5-benzenetetracarboxylic anhydride, 3,3′,4,4′-biphenyltetracarboxylic dianhydride, and combinations thereof.

4 . The electrode binder of claim 1 , wherein the diamine monomer further comprises a second monomer represented by formula V,

5 . The electrode binder of claim 4 , wherein the R 4 in formula V is selected from the group consisting of —(CH2)n-, —O—, —S—, —CH 2 —O—CH 2 —, —CH(NH)—(CH 2 ) n —,

6 . The electrode binder of claim 4 , wherein a molar ratio of the first monomer to the second monomer is 1:2 to 10:1.

7 . The electrode binder of claim 4 , wherein a molar ratio of the first monomer to the second monomer is 1:1 to 3:1.

8 . The electrode binder of claim 1 , wherein a molar ratio of the dianhydride monomer to the diamine monomer is 1:10 to 10:1.

9 . The electrode binder of claim 1 , wherein a molar ratio of the dianhydride monomer to the diamine monomer is 1:2 to 4:1.

10 . The electrode binder of claim 1 having a molecular weight in a range from about 1000 to about 50000.

11 . A cathode electrode material comprising a cathode active material, a conducting agent, and an electrode binder, wherein the electrode binder comprises a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer, the dianhydride monomer comprises a monomer selected from the group consisting of monomers represented by formulas I, II, III, and combinations thereof, the diamine monomer comprises a first monomer represented by formula IV,

12 . The cathode electrode material of claim 11 , wherein a mass percentage of the electrode binder is in a range from about 0.01% to about 50%.

13 . The cathode electrode material of claim 11 , wherein a mass percentage of the electrode binder is in a range from about 1% to about 20%.

14 . A lithium ion battery comprising:
an anode electrode; an electrolyte; a separator; and a cathode electrode, the cathode electrode comprising a cathode active material, a conducting agent, and an electrode binder, wherein the electrode binder comprises a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer, the dianhydride monomer comprises a monomer selected from the group consisting of monomers represented by formulas I, II, III, and combinations thereof, the diamine monomer comprises a first monomer represented by formula IV,

15 . The lithium ion battery of claim 14 , wherein the electrode binder is consisted of the polymer.

16 . The lithium ion battery of claim 14 , wherein the cathode active material is selected from the group consisting of layer type lithium transition metal oxides, spinel type lithium transition metal oxides, olivine type lithium transition metal oxides, and combinations thereof.

Assignees

• Jiangsu Huadong Inst Of Li-Ion Battery Co Ltd
• Univ Tsinghua

Inventors

• Qian guan-nan
• He xiang-ming
• Wang Li
• Shang yu-ming
• Li Jian-Jun
• Luo Jing
• Xu cheng-hao
• Gao Jian
• Wang yao-wu

Classifications

• C09J2203/33

  for batteries or fuel cells · CPC title

• C08G73/1071 Primary

  Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title