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A gradient fluorine-doped ternary positive electrode material with low lattice stress and its preparation method

A lattice stress and cathode material technology, applied in electrical components, battery electrodes, structural parts, etc., can solve the problems affecting the cycle stability and rate performance of electrode materials, changing the proportion of transition metal elements, and high lattice stress. Low cost, consistent lattice parameters, and simple preparation process

Active Publication Date: 2020-01-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of lattice stress caused by the change of the transition metal element ratio in the oxide positive electrode material of the lithium ion battery, so that the lattice stress of the oxide positive electrode material of the lithium ion battery is relatively high, and then affects the electrode material. Problems of cycle stability and rate performance, and provide a gradient fluorine-doped ternary cathode material with low lattice stress and its preparation method

Method used

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  • A gradient fluorine-doped ternary positive electrode material with low lattice stress and its preparation method
  • A gradient fluorine-doped ternary positive electrode material with low lattice stress and its preparation method
  • A gradient fluorine-doped ternary positive electrode material with low lattice stress and its preparation method

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specific Embodiment approach 1

[0035] Specific Embodiment 1: The chemical formula of a gradient fluorine-doped ternary cathode material with low lattice stress in this embodiment is LiNi x co y mn z m 1-x-y-z o 2-n f n ; Wherein the Ni content x decreases from the inside to the outside, and the F content n increases from the inside to the outside, 0<x≤1, 0<y≤1, 0<z≤1, 0<x+y+ z≤1, 0<n≤0.15.

specific Embodiment approach 2

[0036] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the change gradient of the content x of Ni and the change gradient of the content n of F satisfy 5≤Δ x / Δ n ≤7; where Δ x is the difference of Ni content x at different distances from the center of the sphere, Δ n is the difference of the content n of F at the position corresponding to the content x of Ni. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0037] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: said M is Li, Zr, Fe, Sm, Pr, Nb, Ga, Zn, Y, Mg, Al, Cr, Ca, Na , Ti, Cu, K, Sr, Mo, Ba, Ce, Sn, Sb, La and Bi or a mixture of several. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a gradient fluorine-doped ternary positive electrode material with low crystal lattice stress and a preparation method thereof. The invention belongs to the field of lithium ion batteries and in particular relates to a gradient fluorine-doped ternary positive electrode material with low crystal lattice stress and a preparation method thereof. The invention aims to solve the problems that a lithium ion battery oxide positive electrode material is high in crystal lattice stress and the cycling stability and rate capability of the electrode material are further influenced because the crystal lattice stress is produced by the change of a ratio of transition metal elements in the lithium ion battery oxide positive electrode material. The method comprises the following steps: 1, preparing an aqueous solution of a mixed metal salt; 2, preparing an aqueous solution of a precipitator; 3, preparing an aqueous solution of a complexing agent; 4, preparing an aqueous solution of fluorides; 5, preparing a precursor material; 6, cooling; and 7, preparing the gradient fluorine-doped ternary positive electrode material. According to the gradient fluorine-doped ternary positive electrode material and the preparation method thereof disclosed by the invention, the content of Ni and F in the gradient fluorine-doped ternary positive electrode material has a reverse gradient change, the crystal lattice stress is effectively decreased, and the cycling stability and the rate capability are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a gradient fluorine-doped ternary cathode material with low lattice stress and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, they have rapidly become the most important and widely used secondary batteries. After years of development, today's lithium-ion batteries have been widely used in various small portable electronic products and power tools, and as countries around the world pay more attention to energy in recent years, they are gradually being widely used in the new energy vehicle market. Cathode material is one of the key materials for manufacturing lithium-ion batteries. Since the specific capacity of general positive electrode materials is significantly lower than that of negative electrode materials, the performance of positive electrode materials directly affects the indica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杜春雨徐晟徐星尹鸽平左朋建程新群马玉林
Owner HARBIN INST OF TECH
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