Positive electrode material and preparation method and battery

A positive electrode material and spinel technology, which is applied to the preparation method thereof and the fields of batteries and positive electrode materials, can solve problems such as the danger of flatulence of batteries, and achieve the effects of increasing gram capacity, increasing conductivity and reducing electronic conduction resistance.

Inactive Publication Date: 2019-04-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because LiNi 0.5 mn 1.5 o 4 The high voltage discharge platform, Mn 4+ Redox side reactions will occur with the electrolyte, leading to the dissolution of manganese, and the dissolved manganese will migrate to the negative electrode, catalyzing the formation of the SEI film on the surface of the negative electrode, and eventually lead to the danger of flatulence in the battery during storage and circulation, which restricts LiNi 0.5 mn 1.5 o 4 Main reasons for material commercialization

Method used

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  • Positive electrode material and preparation method and battery
  • Positive electrode material and preparation method and battery
  • Positive electrode material and preparation method and battery

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preparation example Construction

[0023] The second aspect of the embodiments of the present invention provides a method for preparing a positive electrode material, at least including the following steps:

[0024] Step 1: Mix the lithium source, nickel source, manganese source and doping metal source of spinel lithium nickel manganese oxide and sinter to generate the spinel lithium nickel manganese oxide;

[0025] Step 2: Mix the lithium source, phosphorus source, iron source and carbon source of lithium iron phosphate with spinel lithium nickel manganese oxide and then granulate to obtain the precursor;

[0026] Step 3: Sintering the precursor to obtain the positive electrode material.

[0027] Optionally, in step 1, when sintering spinel lithium nickel manganese oxide, the lithium source of spinel lithium nickel manganese oxide is selected from at least one of lithium carbonate, lithium hydroxide, lithium nitrate, and lithium chloride , not limited thereto; and further optional lithium hydroxide monohydrat...

experiment example

[0089] 1. Residual lithium (Li + )Comparative Experiment

[0090] Get the cathode material that embodiment 1-7 and comparative example 1-3 prepare, under the same condition carry out residual lithium (Li + )Comparative Experiment.

[0091] Residual lithium (Li + ) amount comparison test method is the acid-base titration method: titrate lithium carbonate and lithium hydroxide in the positive electrode material with hydrochloric acid standard solution, use the pH electrode as the indicator electrode, determine the end point by means of the sudden jump generated by the potential change, and calculate the residual amount on the surface of the positive electrode material. lithium amount.

[0092] The obtained experimental results are shown in Table 4.

[0093] Table 4

[0094] project

unit

Example 1

Example 2

Example 3

Example 4

Example 5

Li +

%(w / w)

0.0810

0.0832

0.0737

0.0813

0.0734

project

unit

Exam...

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Abstract

The present application belongs to the field of energy storage materials, and particularly relates to a positive electrode material and a preparation method thereof and a battery. The positive electrode material is a spinel lithium nickel manganese oxide coated with a coating layer, and the coating layer contains lithium iron phosphate and carbon. The positive electrode material containing the coating structure of lithium iron phosphate and carbon can simultaneously increase the conductivity of lithium ions and electrons, and can effectively increase the gram capacity and the first coulombic efficiency of the positive electrode material, thereby effectively alleviating the flatulence of the lithium nickel manganate battery core.

Description

technical field [0001] The application belongs to the field of energy storage materials, and specifically relates to a positive electrode material, a preparation method thereof and a battery. Background technique [0002] Lithium-ion batteries occupy a dominant position in the global secondary battery market due to their advantages of high working voltage, wide working range, large specific energy, no pollution, and long service life, especially in electric vehicles and other fields in recent years. However, the current commercial lithium-ion batteries still cannot meet the low-cost and high-energy-density requirements of electric vehicles. In today's lithium-ion battery technology, the positive electrode material is the decisive factor for the voltage and capacity of the lithium-ion battery, and the cost of the positive electrode material accounts for about 40% of the battery cell, making a huge contribution to the cost of the lithium-ion battery. Therefore, the developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 郭晓倩吴关高旭光柳娜
Owner CONTEMPORARY AMPEREX TECH CO
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