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Multiplying power type ternary battery and preparation method thereof

A ternary battery and rate performance technology, which is applied to secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of high battery surface temperature, potential safety hazards, poor rate cycle performance, etc., achieve strong discharge capacity, improve Conductivity, effect of increasing movement speed

Inactive Publication Date: 2016-05-18
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the current technical level, the power battery of the ternary system can only achieve a discharge capacity below 10C, and the rate cycle performance is poor
At the same time, the surface temperature of the ternary power type battery is relatively high during discharge, and there are certain potential safety hazards.

Method used

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  • Multiplying power type ternary battery and preparation method thereof
  • Multiplying power type ternary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Production of positive electrode sheet: Add 111-type ternary material, carbon nanotubes, carbon fiber and PVDF into NMP at a mass ratio of 88:3:3:6 to prepare a slurry, and then coat the slurry on the aluminum foil. After drying, rolling, slitting and sheeting in sequence, a positive electrode sheet containing 2 tabs is obtained, and the density of both sides of the electrode sheet is controlled to be 400g / m2 during coating. 2 , the compacted density of the pole piece is 3.2g / cm when rolling 3 ;

[0024] (2) Production of negative electrode sheet: Add artificial graphite, mesophase carbon microspheres, carbon nanotubes, carbon fibers, CMC and SBR into water to prepare slurry according to the mass ratio of 78.3:8.7:3.25:3.25:5.5:2, and then put The slurry is coated on the copper foil, followed by drying, rolling, slitting and sheeting to obtain a negative electrode sheet with 2 tabs, in which the density of both sides of the electrode sheet is controlled to be 210g / ...

Embodiment 2

[0028] (1) Production of positive electrode sheet: Add 532-type ternary material, carbon nanotubes, carbon fiber and PVDF into NMP at a mass ratio of 95:1:0.5:3.5 to prepare slurry, and then coat the slurry on aluminum foil, After drying, rolling, cutting and sheeting in sequence, a positive electrode sheet containing 2 tabs was obtained, and the density of both sides of the electrode sheet during coating was controlled to be 320g / m 2 , the compaction density of the pole piece is 3.5g / cm when rolling 3 ;

[0029] (2) Production of negative electrode sheet: Add artificial graphite, mesocarbon microspheres, carbon nanotubes, carbon fibers, CMC and SBR into water to prepare slurry according to the mass ratio of 65.1:27.9:1.5:1.5:2:2, and then put The slurry is coated on the copper foil, followed by drying, rolling, slitting and sheeting to obtain a negative electrode sheet with 3 tabs, and the density of both sides of the electrode sheet during coating is controlled to be 160g / m...

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Abstract

The invention designs a multiplying power type ternary battery. The battery shows better discharge capability and cycle performance at the discharge rate of 5-20 C. According to the main design scheme of the battery, a 111 or 532 type ternary material is adopted for a positive pole and a mesophase carbon microsphere and artificial graphite mixed material is adopted for a negative pole to improve the conductive capability and absorbing capability of the material. A diaphragm is a large-porosity PE or PP ceramic composite diaphragm for improving the lithium ion dis-embedding rate. Electrolyte is improved multiplying power type electrolyte. In addition, the battery pole piece manufacturing process, coating and rolling parameters of the positive pole and the negative pole are controlled, the internal polarization effect during battery discharge can be effectively alleviated, the large current discharge capacity of the battery can be improved, and discharge temperature of the battery can be reduced.

Description

technical field [0001] This patent relates to the field of lithium-ion batteries, in particular to a rate-type ternary battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of large specific capacity, safety and stability, and long cycle life, and have been successfully used in electric vehicles, electronic products and other fields. Lithium batteries can be divided into capacity batteries and power batteries according to their performance. Power type batteries are also called rate type batteries. Generally speaking, the capacity type battery has a higher energy ratio, but it may fail to discharge electricity at a slightly higher discharge rate. Due to the small internal polarization, the power battery can provide a favorable environment for lithium ion deintercalation, and has a good high-current discharge capacity. Therefore, power batteries are widely used in the fields of electric tools and electric vehi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/587H01M4/62H01M10/0567H01M10/42H01M2/16H01M4/139H01M4/1393H01M50/434H01M50/44
CPCH01M4/139H01M4/1393H01M4/587H01M4/625H01M4/628H01M10/0525H01M10/0567H01M10/4235H01M2300/0025H01M50/431H01M50/411Y02E60/10
Inventor 关成善宗继月李涛梅庆虎周会
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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