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Positive plate of high power lithium ionic cell and lithium ionic cell containing the same

A technology for lithium-ion batteries and positive plates, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of low conductivity and tap density, high-rate discharge and fast rate cycle capacity decay, and constraints on nickel-cobalt-manganese acid The application of lithium materials and other issues, to achieve the effect of improving specific capacity, good high-current discharge performance, and good rate cycle performance

Active Publication Date: 2011-06-08
HANGZHOU NARADA BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with lithium cobalt oxide, nickel cobalt lithium manganese oxide material has the main disadvantages of low electrical conductivity and tap density, high rate discharge and rate cycle capacity decay faster, which greatly restricts nickel cobalt lithium manganese oxide material. Application on high power lithium-ion battery

Method used

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  • Positive plate of high power lithium ionic cell and lithium ionic cell containing the same
  • Positive plate of high power lithium ionic cell and lithium ionic cell containing the same
  • Positive plate of high power lithium ionic cell and lithium ionic cell containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Preparation of the lithium ion battery cathode provided by the present invention

[0044] 5 parts by weight of layered LiCoO 2 , 3 parts by weight layered LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and 2 parts (by weight) layered LiNi 0.2 co 0.6 mn 0.2 o 2 The mixture is used as positive electrode active material after being dry mixed in a blender, and the proportion is 94% (weight), adopting 3% (weight) of PVDF as binder, 1% (weight) vapor phase growth nano-carbon fiber and 2% (weight) of superconducting carbon black is the conductive agent, and the rest of N-methylpyrrolidone is the solvent. Add the above-mentioned substances into a vacuum stirring tank in turn, and then ultrasonically stir to prepare a positive electrode slurry with a uniform chemical composition and no air bubbles. The positive electrode slurry is coated on an aluminum foil with a thickness of 20 μm, and the positive electrode active material on the collector. The surface coating amount is 85g / m ...

Embodiment 2

[0045] Example 2 Preparation of the lithium ion battery cathode provided by the present invention

[0046] In this example layered LiCoO 2 , layered LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and layered LiNi 0.2 co 0.6 mn 0.2 o 2 The mixing weight ratio was 3:5:2, and the other processes were the same as in Example 1, and the positive electrode sheet produced was marked as A2.

Embodiment 3

[0047] Example 3 Preparation of the lithium ion battery cathode provided by the present invention

[0048] In this example layered LiCoO 2 and layered LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The mixing weight ratio was 1:9, and the other processes were the same as in Example 1, and the positive electrode sheet produced was marked as A3.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a high-power lithium ion battery positive plate and a lithium ion battery thereof. The invention discloses a high-power lithium ion battery positive plate, which comprises a current collector and cathode material, wherein the cathode material comprises positive active substances, bonding agent and conductive agent, and is characterized in that the positive active substance is formed by layered lithium cobalt oxide and layered nickel cobalt lithium manganese oxide, and the proportion by weight of lithium cobalt oxide and nickel cobalt lithium manganese oxide is 1-7:1-9. The invention further provides a lithium ion battery which contains the positive plate. The invention solves the problems of bad heavy-current discharge and poor performance high circulation generated after layered nickel cobalt lithium manganese oxide material is used on a high-power lithium ion battery owing to the weaknesses existing in the nickel cobalt lithium manganese oxide material of lower electric conductivity and tap density. The lithium ion battery disclosed by the invention has excellent heavy-current discharge performance and high circulation performance, wherein the25 C continuous discharge capacity is 88% of the 0.5C discharge capacity, and the capacity conservation rate is 85% after 20 C cell multiplying power circulates 120 cycles.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-power lithium-ion battery positive plate and a lithium-ion battery containing the same. Background technique [0002] Lithium-ion battery is a green high-energy rechargeable battery that appeared in the early 1990s. It has unique advantages such as wide application temperature range, low self-discharge rate, long cycle life, and good safety performance. At present, lithium-ion batteries are roughly divided into two types: energy type and power type. The two types of products are quite different in terms of materials and structural design. Large-scale commercialized high-power lithium-ion batteries all use lithium cobalt oxide as the positive electrode. The battery has the advantages of stable performance, long cycle life, high working voltage and good rate discharge characteristics, but it also has high temperature and poor overcharge safety. This makes the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/48H01M4/58H01M4/04H01M10/40
CPCY02E60/122Y02E60/10
Inventor 侯敏黄睿高蕾马尚德王路
Owner HANGZHOU NARADA BATTERY
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