Binary-doping single-crystal ternary positive electrode material and preparation method thereof

A positive electrode material, binary doping technology, applied in the field of lithium-ion batteries, can solve the problems of battery cycle stability and safety to be improved, the inability to form single crystal ternary positive electrode materials, capacity and stability, etc., reaching a high level Stable, no capacity decay, less side effects

A positive electrode material, binary doping technology, applied in the field of lithium-ion batteries, can solve the problems of battery cycle stability and safety to be improved, the inability to form single crystal ternary positive electrode materials, capacity and stability, etc., reaching a high level Stable, no capacity decay, less side effects

CN110233253AActive Publication Date: 2019-09-13BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Binary-doping single-crystal ternary positive electrode material and preparation method thereof
  • Binary-doping single-crystal ternary positive electrode material and preparation method thereof
  • Binary-doping single-crystal ternary positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Ni 0.8 co 0.1 mn 0.1 (OH) 2 The ternary positive electrode precursor, the first dopant aluminum acetate, and the second dopant titanium oxalate are mixed uniformly by a ball mill, and the solid powder is obtained by spray drying, wherein the molar ratio of the ternary positive electrode precursor, aluminum acetate, and titanium oxalate is 1 :0.02:0.001; the above-mentioned obtained solid powder, lithium hydroxide monohydrate and the lithium salt mixture of lithium carbonate, and the first solid additive sodium citrate are mixed uniformly and then sintered, wherein the lithium mole of lithium hydroxide monohydrate accounts for the mixture The molar ratio of lithium is 0.95, and the molar ratio of lithium salt, ternary positive electrode precursor and first solid additive is 1.03:1:0.3. The sintering procedure is specifically to place the mixture in an oxygen atmosphere furnace with an oxygen volume ratio of 95%, at 5 °C min -1 The heating rate is increased to 500°C a...

Embodiment 2

[0041] The binary doped single crystal ternary lithium battery positive electrode material was prepared according to the same operating conditions and steps as in Example 1, except that the first dopant was replaced by aluminum hydroxide.

Embodiment 3

[0043] The binary doped single crystal ternary lithium battery cathode material was prepared according to the same operating conditions and steps as in Example 1, except that the first dopant was replaced by magnesium oxide.

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Abstract

The invention provides a binary-doping single-crystal ternary positive electrode material and a preparation method thereof. The chemical expression of the binary-doping single-crystal ternary positiveelectrode material is Li<1+y+z>NiCoMn<c>A<y>B<z>O<2>, wherein 1>a>b>=c>0, a >=0.5, (a+b+c) is equal to 1, 0.05>=y>=0.001, 0.005>=z>=0.001, A is a first doping element and is selected from at least one of Mg and Al, and B is a second doping element and is selected from at least one of Ti, V, B, Sb, La and T. In the single-crystal ternary positive electrode material, the single-crystal ternary positive electrode material with excellent comprehensive performance is obtained by adjusting types and proportions of doping substances, the discharging specific capacity and the cycle stability both are improved to a certain extent, oxygen relief temperature at 4.3V is relatively high, and the application safety of a lithium battery can be met; and meanwhile, the preparation method of the binary-doping single-crystal ternary positive electrode material is simple and available in raw material, and the binary-doping single-crystal ternary positive electrode material is a single-crystal ternary positive electrode material, suitable for large-scale commercial production, for a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a binary doped single crystal ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been continuously developed since they were successfully commercialized by Sony in 1991. Lithium-ion batteries are considered to be the best choice for energy storage devices and power sources in the field of new energy because of their superior characteristics such as high energy density, long cycle life, and environmental protection; Due to the environmental pollution, electric vehicles driven by electricity came into being, which requires the battery in the power source to carry high-quality electric energy as much as possible within a limited space and within a controllable quality range. The current commercial lithium-ion battery cathode materials are mainly: lithium iron phosphate (LiFePO 4 ), lithium ma...

Claims

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Application Information

Patent Timeline
13 Sep 2019
Publication
CN110233253A
IPC
H01M4/36; H01M4/505; H01M4/525; H01M4/62; H01M10/0525; C30B1/02; C30B29/16
CPC
C30B1/02; C30B29/16; H01M4/362; H01M4/505; H01M4/525; H01M4/628; H01M10/0525; H01M2004/021
Inventors
郭玉国; 盛航