Positive material of high-voltage lithium ion battery, lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in the manufacture of electrolyte batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor high-rate discharge performance, oxygen defects in spinel structures, and difficulty in making single equivalence, achieving Effect of high thermal stability, good stability, good structural stability and cycle performance

Inactive Publication Date: 2018-06-12
BEIJING NAT BATTERY TECH
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AI Technical Summary

Problems solved by technology

[0004] The most studied high-voltage cathode material is the spinel oxide LiNi 0.5 mn 1.5 o 4 , but the key problem of this material is that it is not easy to produce a product with a single phase and good chemical stability
The usual solid-phase method or liquid-phase method tends to cause oxygen defects in the spinel structure during high temperature treatment. The material is not synthesized according to the stoichiometric ratio, and Li x Ni 1－x O and other impurity phases, Mn 3+ It does not completely disappear, which makes the phase change serious during the charging and discharging process, which is easy to cause problems such as capacity attenuation and poor high-rate discharge performance.

Method used

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  • Positive material of high-voltage lithium ion battery, lithium ion battery and preparation method thereof
  • Positive material of high-voltage lithium ion battery, lithium ion battery and preparation method thereof

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preparation example Construction

[0080] In a third aspect, a method for preparing the aforementioned lithium-ion battery is provided, comprising the following steps:

[0081] (a) fully mixing each raw material in the negative electrode material to obtain a negative electrode material slurry, uniformly coating the negative electrode material slurry on the surface of the negative electrode current collector, and then drying and compacting to form a negative electrode sheet;

[0082] (b) fully mixing each raw material in the positive electrode material to obtain a positive electrode material slurry, uniformly coating the positive electrode material slurry on the surface of the positive electrode current collector, and then drying and compacting to form a positive electrode sheet;

[0083] (c) Assemble the positive electrode sheet, negative electrode sheet, separator and electrolyte to obtain a lithium ion battery.

[0084] The above-mentioned lithium ion battery structurally includes a casing, a positive electro...

Embodiment 1

[0091] A high-voltage lithium battery positive electrode material, including the following raw materials in weight percentage: 92% of positive electrode active material with single crystal structure, 4% of conductive carbon black and 4% of PVDF;

[0092] The structural formula of the positive electrode active material with single crystal structure is LiNi 0.5 co 0.2 mn 0.3 o 2 .

Embodiment 2

[0094] A high-voltage lithium battery positive electrode material, including the following raw materials in weight percentage: 95% of positive electrode active material with single crystal structure, 2.5% of conductive carbon black and 2.5% of PVDF;

[0095] The structural formula of the positive electrode active material with single crystal structure is LiNi 0.5 co 0.2 mn 0.3 o 2 .

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Abstract

The invention belongs to the technical field of lithium ion batteries and relates to a positive material of a high-voltage lithium ion battery, the lithium ion battery and a preparation method thereof. The positive material of the high-voltage lithium ion battery is prepared from the following raw materials in percent by weight: 92%-98% of positive active substance with a single-crystal structure,1%-4% of conductive agent and 1%-4% of binding agent, wherein the structural formula of the positive active substance with the single-crystal structure is LiNixCoyMn1-x-yO2; in the formula, x is morethan 0.4 and less than 0.9, y is more than 0 and less than 0.4, and 1-x-y is more than 0 and less than 1. The positive material has good structural stability and higher heat stability in the processof high-voltage circulation, so that the defects of easy structure change and the like of the existing positive material when in use under a high voltage due to poor heat stability are relieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage lithium battery cathode material, a lithium ion battery and a preparation method thereof. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. The key material of lithium-ion batteries is the cathode material, which accounts for about 30% of the cost of lithium-ion batteries. At present, the positive electrode materials used in lithium-ion batteries on the market mainly include lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, and nickel-cobalt lithium manganese oxide (NCM) ternary materials. [0003] With the increase of electric vehicles, hybrid vehicles, cordless power tools and military applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525H01M10/0569H01M10/058
CPCH01M4/364H01M4/505H01M4/525H01M10/0525H01M10/0569H01M10/058H01M2300/0028Y02E60/10Y02P70/50
Inventor 苏凯乔乔陆文宁
Owner BEIJING NAT BATTERY TECH
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