Lithium manganese oxide battery positive electrode sheet and preparation method thereof

A technology of lithium manganate battery and positive electrode sheet, which is applied in battery electrodes, electrode manufacturing, electrode current collector coating and other directions, can solve the problems such as not meeting the needs of green industry development, easy to swell electronic ion conductivity, and toxicity, etc. Achieving good cycle rate performance, improving bonding performance and mechanical stability, and excellent lubricity

Active Publication Date: 2020-12-08
深圳中华自行车(集团)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] PVDF is not only easy to swell in organic solvents but also has poor electronic and ion conductivity, while the organic solvent NMP is volatile and toxic. This bonding system does not meet the development needs of green industries and needs to be improved.

Method used

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  • Lithium manganese oxide battery positive electrode sheet and preparation method thereof
  • Lithium manganese oxide battery positive electrode sheet and preparation method thereof
  • Lithium manganese oxide battery positive electrode sheet and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A lithium manganese oxide battery positive electrode sheet, the raw material components are as follows in parts by weight.

[0053]

[0054] Such as figure 1 Shown, the preparation method of this lithium manganese oxide battery positive plate comprises the following steps:

[0055] S1, preparation of water-based adhesive: mix carboxymethyl chitosan, polyethylene glycol and cross-linking agent SaC-100 evenly at 70°C, and keep warm for 0.5h;

[0056] S2, preparation of conductive paste: (1) adding sulfur-doped carbon nanotubes in parts by weight to Pingping plus O and stirring evenly, grinding in a colloid mill for 1h and mixing evenly to obtain a mixed slurry; (2) adding graphite to the mixed slurry olefin, continue to grind in the colloid mill for 1h and mix evenly to obtain the conductive paste;

[0057] S3, pulping: Add water-based adhesive to the mixing tank, add 75 parts of deionized water, stir and disperse at 100rpm for 10min, add conductive paste and stir an...

Embodiment 2

[0060] A lithium manganese oxide battery positive electrode sheet, the raw material components are as follows in parts by weight.

[0061]

[0062] The preparation method of the lithium manganate battery positive plate comprises the following steps:

[0063] S1, preparation of water-based adhesive: mix carboxymethyl chitosan, polyethylene glycol and cross-linking agent SaC-100 evenly at 75°C, and keep warm for 0.8h;

[0064] S2, preparation of conductive paste: (1) add sulfur-doped carbon nanotubes in parts by weight to Pingping plus O and stir evenly, grind in a colloid mill for 1.2h and mix evenly to obtain a mixed slurry; (2) Add to the mixed slurry Graphene, continue grinding in the colloid mill for 1.2h and mix evenly to obtain the conductive paste;

[0065] S3, pulping: Add water-based adhesive to the mixing tank, add 75 parts of deionized water, stir and disperse at 100rpm for 10min, add conductive paste and stir and disperse at 500rpm for 30min, add 180 parts of li...

Embodiment 3

[0068] A lithium manganese oxide battery positive electrode sheet, the raw material components are as follows in parts by weight.

[0069]

[0070] The preparation method of the lithium manganate battery positive plate comprises the following steps:

[0071] S1, preparation of water-based adhesive: mix carboxymethyl chitosan, polyethylene glycol and cross-linking agent SaC-100 evenly at 80°C, and keep warm for 1 hour;

[0072] S2, preparation of conductive paste: (1) add sulfur-doped carbon nanotubes in parts by weight to Pingping plus O and stir evenly, grind in a colloid mill for 1.5h and mix evenly to obtain a mixed slurry; (2) Add to the mixed slurry Graphene, continue to grind 1.5h in colloid mill and mix evenly, obtain conductive paste;

[0073] S3, pulping: Add water-based adhesive to the mixing tank, add 78 parts of deionized water, stir and disperse at 100rpm for 13min, add conductive paste and stir and disperse at 500rpm for 35min, add 175 parts of lithium mangan...

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Abstract

The invention discloses a lithium manganate battery positive electrode piece and a preparation method thereof, and belongs to the technical field of lithium manganate batteries. The positive electrodepiece comprises the following raw materials by weight: 22-26 parts of an aqueous binder; 48-52 parts of conductive paste; 280-300 parts of lithium manganate; 85-95 parts of deionized water; the water-based adhesive is prepared from the following raw materials in parts by weight: 16-18 parts of carboxymethyl chitosan; 5-6 parts of polyethylene glycol; and 1-2 parts of a cross-linking agent. Carboxymethyl chitosan serving as a water-based binder has the advantages of good water solubility, no pollution, low price and the like, and also has good cycle rate performance when being compared with aPVDF system. Polyethylene glycol has good water solubility, excellent lubricity, dispersibility and adhesion, and strong toughness, and can be blended with carboxymethyl chitosan to improve the flexibility of the grade sheet. The chemical crosslinking of the cross-linking agent and carboxymethyl chitosan can improve the adhesive property and mechanical stability of the electrode piece, thereby improving the performance of the battery.

Description

technical field [0001] The present invention relates to the technical field of lithium manganate battery, more specifically, it relates to a lithium manganate battery positive plate and a preparation method thereof. Background technique [0002] Lithium manganate battery refers to a battery that uses lithium manganate material as the positive electrode, and its voltage is 2.5V-4.2V. Lithium manganate battery is widely used for its low cost and good safety. [0003] The Chinese patent with the publication number CN103633291B discloses a positive electrode sheet of a lithium ion battery. The positive electrode sheet of the lithium ion battery includes a base layer, and the upper and lower surfaces of the base layer are coated with a lithium manganate material layer. Coated with a ternary material layer, the thickness of the lithium manganate material layer on the upper and lower surfaces of the base layer is the same, and the thickness of the ternary material layer on the uppe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M4/04
CPCH01M4/0404H01M4/362H01M4/505H01M4/622H01M4/624Y02E60/10
Inventor 李晨农
Owner 深圳中华自行车(集团)股份有限公司
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