Pressure-resistant positive electrode active material and electrochemical energy storage device

A positive electrode active material and positive electrode material technology, applied in the field of positive electrode active materials and electrochemical energy storage devices, can solve the problems of battery cell cycle performance deterioration, strong surface activity, side reactions, etc.

Active Publication Date: 2020-07-07
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high nickel content and strong surface activity of polycrystalline high-nickel ternary materials, it is easy to have side reactions with the electrolyte, which leads to obvious deterioration of the cycle performance of the battery cell, which is one of the main difficulties in current market applications.
Through the research, it is found that the ternary positive electrode material will have particle cracking during the cycle, and the failure analysis of the battery cell found that particle cracking is the main reason for the deterioration of the cycle performance of the battery cell

Method used

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  • Pressure-resistant positive electrode active material and electrochemical energy storage device
  • Pressure-resistant positive electrode active material and electrochemical energy storage device
  • Pressure-resistant positive electrode active material and electrochemical energy storage device

Examples

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preparation example Construction

[0062] The fourth aspect of the present invention provides the preparation method of the positive electrode active material of the first aspect of the present invention, the method of the positive electrode active material should be known to those skilled in the art, for example, may include: those skilled in the art may According to the elemental composition of the positive electrode active material, an appropriate raw material and proportion of the positive electrode active material are selected. For example, the raw material of the positive electrode active material may include a ternary material precursor of nickel, cobalt, manganese and / or aluminum, lithium source, Me source, A source, etc., and the ratio between each raw material is generally referred to the ratio of each element in the positive electrode active material. The ratio is matched. More specifically, the ternary material precursor may include but not limited to Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 、Ni 0.5 co 0.2...

Embodiment 1

[0079] 1. Preparation of cathode materials

[0080] 1) Prepare nickel sulfate, manganese sulfate, and cobalt sulfate in a molar ratio of 8:1:1 into a solution with a concentration of 1mol / L, and use hydroxide co-precipitation technology to prepare the nickel-cobalt-manganese ternary material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 . In the process of preparing the precursor, the initial pH value during co-precipitation is controlled to be 9.5, the ammonia concentration is 0.4M, and the post-reaction aging time is 5 h.

[0081] 2) The above-mentioned nickel-cobalt-manganese ternary material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 , Li-containing compound LiOH·H 2 O is placed in a mixing device at a molar ratio of 1:1.05 for mixing, then placed in an atmosphere furnace for sintering at 800 ° C, and after cooling, it is mechanically ground to form the positive active material matrix; the above positive active material matrix and additive Al 2 o 3 According to the mass ratio...

Embodiment 2

[0095] It is basically the same as Example 1, the difference lies in the preparation method of the positive electrode material: during the preparation of the precursor, the pH value of the co-precipitation is adjusted to 10.5, the ammonia concentration is 0.3M, and the aging time after the reaction is 3h.

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Abstract

The invention relates to the technical field of batteries, in particular to a pressure-resistant positive electrode active material and an electrochemical energy storage device. The positive electrodeactive material comprises secondary particles consisting of primary particles; the number [sigma] of the primary particles in a unit spherical area in an SEM map of the secondary particles is 5-30 / [mu]m2; the single-particle compressive strength of the secondary particles is 60 MPa to 300 MPa; the molecular formula of the positive electrode active material is LixNiyCozMkMepOrAm, wherein 0.95 < =x < = 1.05; 0 < = y < = 1, 0 < = z < = 1, 0 < = k < = 1, 0 < = p < = 0.1, 1 < = r < = 2, 0 < = m < = 2 and m + r < = 2; the M is selected from Mn and / or Al, the Me is selected from one or a combination of Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, Sr, Sb, Y, W and Nb, and the A is selected from N, F, S and Cl. The particle structure of the positive electrode active material is compact, the positive electrodeactive material has relatively high single-particle compressive strength, and the lithium ion battery using the positive electrode active material has good cycle performance, relatively low volume expansion rate and good dynamic performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a pressure-resistant positive electrode active material and an electrochemical energy storage device. Background technique [0002] With the escalation of energy crisis and environmental problems, the development of new green energy is imminent. Lithium-ion batteries have the advantages of high specific energy, wide application temperature range, low self-discharge rate, long cycle life, good safety performance, and no pollution, and have been used in various fields. Lithium-ion batteries have been gradually tried all over the world as the energy system of automobiles to replace traditional internal combustion locomotives. However, the commonly used lithium iron phosphate (LiFePO 4 ), low nickel ternary (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ), etc., due to the limitation of the nature of the material itself, it cannot fully meet the demand of the power battery for the energy densit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525G01N3/08G01N33/00G01R31/382G01R31/378
CPCG01N3/08G01N33/00H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 杜锐刘勇超赵德宇王嗣慧沈重亨柳娜
Owner CONTEMPORARY AMPEREX TECH CO
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