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High-voltage cathode material for lithium ion battery and preparation method thereof

A positive electrode material, lithium ion technology, applied in the field of positive electrode active materials for lithium ion secondary batteries and its preparation, can solve the problems of unsatisfactory cycle performance and high temperature performance of batteries, and achieve high energy density and good dissolution rate , Excellent effect of high temperature cycle performance

Active Publication Date: 2014-09-03
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] And pure Ni, Co binary system or LiCoO 2 or LiNiO 2 It is impossible to achieve stable charge and discharge under high voltage conditions. After doping experiments, it was found that under high voltage conditions, the cycle performance and high temperature performance of the battery were not ideal, and the expected goals were still not achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step, the preparation of nuclear material (matrix material): Lithium carbonate, Ni 0.05 co 0.95 (OH) 2 1. The dopant alumina and boron trioxide are mixed according to a certain ratio, wherein a=1.15, the doping amount of alumina is 0.2mol%, and the doping amount of diboron trioxide is 0.02mol%. The sintering temperature is controlled at 850°C, the sintering time is 10 hours, air or oxygen is introduced during the sintering process, and the sintered materials are processed by crushing, grading, sieving, iron removal and other processes to obtain nuclear material A.

[0029] In the second step, the shell material precursor [Ni 0.25co 0.75 (OH) 2 ] Preparation:

[0030] a, the preparation of the solution: according to the molar ratio Ni:Co=0.25:0.75 mixed salt solution B1 is prepared, so that the metal ion concentration in the salt solution is 1.5mol / L; the preparation concentration is a sodium hydroxide solution of 2.5mol / L, Preparation concentration is t...

Embodiment 2

[0040] The first step, the preparation of nuclear material (matrix material): lithium carbonate, Co 3 o 4 , the dopant zirconia is mixed according to a certain ratio, so that it satisfies the chemical formula [Li 1.0 CoM 0.001 o 2 ], the sintering temperature was controlled at 400°C, the sintering time was 38h, air was introduced during the sintering process, and the sintered material was processed by crushing, grading, sieving, iron removal and other processes to obtain nuclear material A.

[0041] In the second step, the shell material precursor [Ni 0.5 mn 0.5 (OH) 2 ] Preparation:

[0042] a. Preparation of the solution: Mixed salt solution B1 is prepared according to the molar ratio Ni:Co:Mn =0.5:0.5, so that the metal ion concentration in the salt solution is 0.4mol / L; an alkali solution with a concentration of 10mol / L is prepared, and Concentration is the complexing agent solution of 11mol / L;

[0043] b. Preparation of the initial solution: inject pure water into...

Embodiment 3

[0055] The first step, the preparation of the nuclear material (matrix material): the lithium source material, Ni 0.5 co 0.5 The substance and dopant magnesium oxide are mixed according to a certain ratio, so that it satisfies the chemical formula [Li 1.3 Ni 0.5 co 0.5 m 0.1 o 2 ]. The sintering temperature is controlled at 1300°C, the sintering time is 4 hours, air is introduced during the sintering process, and the sintered material is processed by crushing, grading, sieving, iron removal and other processes to obtain nuclear material A.

[0056] In the second step, the shell material precursor [Ni 0.3 co 0.3 mn 0.3 (OH) 2 ] Preparation:

[0057] a. Solution preparation: According to the molar ratio Ni:Co:Mn=0.33:0.33:0.33, prepare mixed salt solution B1, so that the metal ion concentration in the salt solution is 3mol / L; prepare an alkali solution with a concentration of 2mol / L , the preparation concentration is the complexing agent solution of 2mol / L;

[0058] ...

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Abstract

The invention discloses a high-voltage cathode material for a lithium ion battery. The high-voltage cathode material is a clad material, the core material has the general formula of [LiaNibCocMdO2]; the shell material has the general formula of [LipNixCoyMnzO2]; the cathode material of the lithium ion secondary battery has the general formula of[LiaNibCocMdO2] [LipNixCoyMnzO2]; the content of the core material is 50-99.5wt%, the content of the shell material is 0.05-50wt%. The preparation method comprises the steps of preparing the core material; preparing the precursor [NixCoyMnz (OH)2] of the shell material; cladding; and carrying out sintering twice or many times. According to high-voltage cathode material disclosed by the invention, advantages of Ni and Co elements can be given a full play, the high-voltage cathode material has the advantages of high operation voltage and high energy density as well as excellent high-temperature cycle performance and the dissolution amount of Co can be controlled well.

Description

technical field [0001] The invention relates to an inorganic functional material and a high-tech battery technology, in particular to a positive electrode active material for a lithium ion secondary battery and a preparation method thereof. Background technique [0002] Due to its high energy density, high working voltage and rechargeability, lithium-ion secondary batteries have developed very fast since their inception, and their application fields have also gradually expanded, from the initial power supply of portable devices to defense , automotive and aviation fields. The capacity and performance of the lithium-ion battery are mainly affected by the cathode material, and the cathode material accounts for about 30% of the cost of the lithium-ion battery. Therefore, the development of high-performance cathode materials is the key to improving the technology of lithium-ion batteries. [0003] Among the cathode materials for lithium-ion batteries, nickel-cobalt-lithium mang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李兴翠池田一崇周贵海李魁王文博宋文锋尹雄鸽
Owner NANTONG RESHINE NEW MATERIAL
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