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Lithium ion battery composite positive electrode material and preparation method thereof

A composite positive electrode material and lithium-ion battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery power performance deterioration and battery cell power performance reduction, and achieve power performance improvement and tolerance polarization reduction , to avoid the effect of side effects

Inactive Publication Date: 2019-04-09
SUNWODA ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ideal high-nickel-nickel-cobalt-manganese ternary material is an ideal high-power lithium-ion battery cathode material, but in the actual use process, due to the inconsistency in the lithium-deintercalation depth between the surface and the bulk phase of the lithium-ion battery cathode material and the electrolyte's effect on the surface Corrosion, leading to the deterioration of battery power performance; secondly, high nickel nickel cobalt manganese ternary materials will form a layer of insulating LiOH and Li on the surface and grain boundaries during the preparation process 2 CO 3 , Inhibit the transmission of lithium ions at the electrolyte / lithium-ion battery cathode material interface, further reducing the power performance of the battery cell

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  • Lithium ion battery composite positive electrode material and preparation method thereof
  • Lithium ion battery composite positive electrode material and preparation method thereof
  • Lithium ion battery composite positive electrode material and preparation method thereof

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preparation example Construction

[0031] like figure 1 As shown, it is an embodiment of the preparation method of lithium-ion battery composite positive electrode material of the present invention, which is used to prepare the above-mentioned lithium-ion battery composite positive electrode material, including:

[0032] S1: Mix bismuth source, deionized water and acid agent according to the first specified ratio, and stir to obtain solution A, and at the same time, mix sodium phosphate salt, bromide salt and deionized water according to the second specified ratio to obtain solution B;

[0033] In this embodiment, the bismuth source is preferably Bi(NO 3)3 ·5H 2 O, the solvent is preferably deionized water, the acid agent is preferably anhydrous acetic acid, and the sodium phosphate salt is preferably Na 2 HPO 4 12H 2O, the bromide salt is preferably KBr, wherein the first specified ratio includes: anhydrous acetic acid and Bi(NO 3)3 ·5H 2 The molar ratio of O ranges from 1:1 to 20:1, Bi(NO 3 ) 3 The so...

Embodiment 1

[0057] Bi(NO 3)3 ·5H 2 O is placed in a beaker, first add deionized water, then add anhydrous acetic acid, and then stir to obtain a transparent solution A, anhydrous acetic acid and Bi(NO 3)3 ·5H 2 The molar ratio of O is 1:5, Bi(NO 3)3 The solubility is 1.2mol / L; the Na 2 HPO 4 12H 2 O and KBr were placed in a beaker and dissolved in deionized water to obtain solution B, Na 2 HPO 4 12H 2 The molar ratio of O and KBr is 1:1, Na in solution B 2 HPO 4 The solubility is 0.8mol / L; slowly add solution B to solution A, after adding, stir to obtain suspension C, the Na in solution B 2 HPO 4 and the sum of moles of KBr and Bi(NO in solution A 3)3 The ratio of the number of moles is 1:1; the suspension C was added to a polytetrafluoroethylene-lined reactor at 180°C for 10 hours to react to obtain substance D; substance D was centrifuged to obtain substance F, and deionized water Wash substance F repeatedly until the pH of the washing solution is 6.5; dry the washed substa...

Embodiment 2

[0062] Change Bi(NO3)3 and the molar ratio of anhydrous acetic acid in solution A in embodiment 1 to 1:2, the solubility of Bi(NO3)3 in solution A is changed into 0.1mol / L, Na2HPO4 and KBr in solution B The mol ratio of Na2HPO4 is changed to 4:1, and the solubility of Na2HPO4 in solution B is changed to 0.2mol / L, and the sum of Na2HPO4 and KBr moles in solution B and Bi(NO3)3 in solution A are changed to 1: 1. Change the reaction temperature in the reactor to 140°C, change the reaction time in the reactor to 5 hours, change the type of ternary material before ball milling to Li1.1Ni0.6Co0.1Mn0.3O2, and change the D50 of the ternary material before ball milling Change it to 20μm, change the ratio of balls to materials to 15:1, change the mass ratio of ternary materials to coatings to 2000:1, change the speed of the ball mill to 800rmp, change the ball milling time to 50 hours, and change the sintering temperature to 650°C , the volume ratio of oxygen in the sintering atmosphere...

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Abstract

The invention proposes a lithium ion battery composite positive electrode material and a preparation method thereof. xBiPO4 / (1-x)BiOBr is coated outside a conventional high-nickel NCM ternary lithiumion battery positive electrode material. The lithium ion battery obtained by preparation of the lithium ion battery composite positive electrode material has the following advantages 1) the lithium ion battery is enabled to have same transmission speed in the surface and the interior, and the tolerance polarization is reduced; 2) direct contact between an electrolyte and the surface of the high-nickel NCM ternary material to form side reaction is prevented; and 3) the grain size of the high-nickel NCM ternary material is reduced, and the power performance of the high-nickel NCM ternary material can be substantially improved by coating the surface of the high-nickel NCM ternary material.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a lithium ion battery composite cathode material and a preparation method thereof. Background technique [0002] Currently, fuel-engine vehicles commonly used have problems such as low power efficiency and serious exhaust emissions, and hybrid electric vehicles (HEV) can improve the combustion efficiency of fuel vehicles and reduce fuel consumption and exhaust emissions. Batteries are an important part of HEV vehicles. Currently, the batteries used in HEV vehicles are mainly lithium-ion batteries. An important indicator for judging the performance of lithium-ion batteries for HEV vehicles is the power performance of lithium-ion batteries. Therefore, it is necessary to develop lithium-ion batteries that meet the high power requirements for HEV vehicles. The power performance of lithium-ion batteries based on the lithium intercalation-delithiation mechanism depends on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 欧阳云鹏张耀李鲲陈巍
Owner SUNWODA ELECTRONICS