Positive pole piece, preparation method thereof and lithium ion battery

A technology of positive pole piece and positive active material, applied in the field of positive pole piece and its preparation, can solve the problems of restricting the use range and further application of ternary materials, affecting the charging and discharging efficiency of lithium ion batteries, poor material irreversibility, etc. The effect of preparation cycle, improved electrochemical performance and safety performance, excellent high temperature performance and cycle performance

Inactive Publication Date: 2016-04-13
BEIJING DINGNENG KAIYUAN BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, ternary materials also have their own shortcomings. The poor conductivity of the material itself will lead to unsatisfactory rate performance. In addition, the cycle performance of the material is poor at a high charge and discharge voltage, and the irreversibility of the material is poor. Charge-discharge efficiency of lithium-ion batteries with ternary materials as cathode materials
The obvious shortcomings of these materials have restricted the scope of use and further application of ternary materials.

Method used

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  • Positive pole piece, preparation method thereof and lithium ion battery
  • Positive pole piece, preparation method thereof and lithium ion battery
  • Positive pole piece, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0027] Such as figure 1 As shown, the present invention provides a method for preparing a positive pole sheet, comprising the following steps: S1: premixing a ternary material and lithium manganate to prepare a positive active material; S2: combining the positive active material with a binder agent, conductive agent and organic solvent to make a stable slurry; S3: add a preset quality of lithium carbonate to the slurry, S4: coat the slurry obtained in S3 on an aluminum foil strip Then, drying, rolling, and slicing are carried out to make positive electrode sheets. Among them, preferably, before step S1, it also includes: drying the ternary material and lithium manganate to make dry powder and then mixing, which can make the mixing more uniform. Wherein, the ternary material and lithium manganate can be mixed by physical methods after being dried under vacuum conditions. Among them, preferably, the drying temperature of the ternary material and lithium manganate is 120°C-200°...

Embodiment 2

[0029] The present invention also provides a positive electrode sheet produced by the preparation method of Example 1. After the slurry is dried, the organic solvent evaporates, so the positive electrode sheet includes: positive electrode active material, binder, conductive agent and carbonic acid Lithium; Wherein, the quality of described positive electrode active material accounts for 75%-85% of the total mass of described positive electrode active material, binder and conductive agent, and the quality of described binder accounts for described positive electrode active material, binder 1%-10% of the total mass of the conductive agent and the conductive agent, and the mass of the conductive agent accounts for 1%-10% of the total mass of the positive electrode active material, binder and conductive agent; the positive electrode active material is three A mixed material of primary material and lithium manganate, the mass ratio of the ternary material and lithium manganate is 2:...

Embodiment 3

[0031] The present invention also provides a lithium-ion battery comprising the positive pole piece of Example 3. The power lithium-ion battery includes: a casing, a positive pole, a negative pole, a diaphragm and an electrolyte, and the positive pole provided in Example 2 can be used for the positive pole. The negative electrode can be artificial graphite or natural graphite, the separator can be polyethylene (PE), and the electrolyte can be a ternary electrolyte. The production process of lithium-ion batteries is generally: positive and negative ingredients - positive and negative pulping - positive Negative electrode coating - positive and negative electrode drying - positive and negative electrode rolling - positive and negative electrode sheeting - positive and negative electrode winding - packaging - baking - grouting - formation - vacuum sealing - capacity separation - product battery.

[0032]Adopt the lithium ion battery provided by the present invention to carry out c...

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Abstract

The invention relates to a positive pole piece, a preparation method thereof and a lithium ion battery. The preparation method of the positive pole piece comprises the following steps: step 1, premixing a ternary material with lithium manganate to prepare a cathode active material; step 2, mixing the cathode active material with a binder, a conductive agent and an organic solvent, and pulping the mixture to obtain a stable slurry; step 3, adding a certain amount of lithium carbonate into the slurry; step 4, coating an aluminum foil tape with the slurry, drying, rolling, and slicing, so as to obtain the positive pole piece. The positive pole piece prepared by adopting the preparation method provided by the invention improves the high temperature performance and the cycling stability of lithium ion batteries, greatly reduces the cost of materials, shortens the fusion time of the cathode material, the binder and the conductive agent and improves the production efficiency; besides, as a defined amount of lithium carbonate is added into the slurry, electrolyte decomposition in the cyclic process of batteries is effectively inhibited, and at the same time the solid electrolyte interphase (SEI) film is endowed with better viscoelasticity, the intercalation of lithium ions is facilitated, and both the electrochemical performance and the safety performance of batteries are further improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive pole piece and a preparation method thereof, and a lithium ion battery comprising the positive pole piece. Background technique [0002] Lithium-ion batteries have the advantages of high specific capacity, high working voltage, wide working temperature range, low self-discharge rate, long cycle life, no memory effect, no pollution, light weight and good safety performance, so they are widely used in mobile phones and digital cameras , laptops and other mobile devices. With the development of science and technology, various digital products using lithium-ion batteries are updated and upgraded very quickly, and most of the products tend to be portable and economical. This requires lithium-ion battery products to develop in the direction of high energy density. Lithium battery manufacturers based on expensive lithium cobalt oxide cathode materials have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028H01M2220/20H01M2220/30Y02E60/10
Inventor 杨慧敏郑淑芬贾跃祥卢红红
Owner BEIJING DINGNENG KAIYUAN BATTERY TECH
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