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Lithium ion battery positive electrode precursor material with low crystal lattice stress and preparation method thereof

A lithium-ion battery, lattice stress technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problem of affecting the cycle stability and rate performance of electrode materials, the high lattice stress of ternary positive electrode materials, and the generation of lattice stress and other issues, to achieve the effect of low material cost, small stress, and reduced lattice stress

Active Publication Date: 2017-10-20
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 transition metal element ratio in the ternary gradient precursor material currently used to prepare lithium-ion battery positive electrode materials, so that the lattice stress of the prepared ternary positive electrode material is higher, and then Problems that affect the cycle stability and rate performance of electrode materials, and provide a lithium-ion battery cathode precursor material with low lattice stress and its preparation method

Method used

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  • Lithium ion battery positive electrode precursor material with low crystal lattice stress and preparation method thereof
  • Lithium ion battery positive electrode precursor material with low crystal lattice stress and preparation method thereof
  • Lithium ion battery positive electrode precursor material with low crystal lattice stress and preparation method thereof

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specific Embodiment approach 1

[0034] Specific embodiment one: the chemical formula of a kind of lithium-ion battery anode precursor material with low lattice stress of this embodiment is Ni x co y mn z m 1-x-y-z (OH) 2-n f n or Ni x co y mn z m 1-x-y-z (CO 3 ) 1-0.5n 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

[0035] 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

[0036] 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 lithium ion battery positive electrode precursor 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 lithium ion battery positive electrode precursor material with low crystal lattice stress and the preparation method thereof. The invention aims to solve the problems that the prepared ternary cathode material is high in crystal lattice stress and further the cycling stability and rate capability of the electrode material are influenced because the crystal lattice stress is produced by the change of a ratio of transition metal elements in a conventional ternary gradient precursor material used for preparing the lithium ion battery 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; and 6, cooling. According to the precursor material and the preparation method thereof disclosed by the invention, the content of Ni and F in the lithium ion battery positive electrode precursor 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 lithium ion battery cathode precursor 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 indicato...

Claims

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Application Information

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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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