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High-temperature-resistant positive electrode material and electrolyte composition, lithium battery and preparation method

A technology of positive electrode material and electrolyte, which is applied in the field of lithium battery and preparation, high temperature resistant positive electrode material and electrolyte combination, which can solve the problems of accelerated collapse of material structure and consumption of lithium source, etc.

Pending Publication Date: 2022-07-05
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a high temperature resistant positive electrode material and electrolyte additive combination, a lithium battery and a preparation method, adopting a solid electrolyte coated positive electrode material with doping elements, and then preparing the positive electrode material into For semi-solid batteries, the positive electrode material is combined with the modified additive in the electrolyte to solve the problems of accelerating the collapse of the material structure and consuming the lithium source in the electrolyte during high-temperature cycles

Method used

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  • High-temperature-resistant positive electrode material and electrolyte composition, lithium battery and preparation method

Examples

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Embodiment 1

[0041] The preparation method of lithium battery includes the following steps:

[0042] S1. Dissolve lithium salts, manganese salts, nickel salts, cobalt salts and zirconium elements (Zr) in deionized water to form a salt solution, then drop an ammonia complexing agent in the salt solution and dry it at a temperature of Pre-calcination at 500°C prepares the precursor of the ternary positive electrode material; wherein (lithium salt, manganese salt, nickel salt, cobalt salt): zirconium element (Zr)=1:1.8%, and lithium salt, manganese salt, nickel salt , cobalt salts are oxalates;

[0043] S2. According to the ratio of ternary cathode material: solid electrolyte = 1:25%, add solid electrolyte (Li 2 S-P 2 S 5 ), after stirring and mixing, sintering at 900 °C to obtain a high temperature resistant positive electrode material with a core-shell structure;

[0044] S3. The high temperature resistant positive electrode material is used to prepare the positive electrode piece and the...

Embodiment 2

[0046] The difference between the preparation method of lithium battery and Example 1 is that in step S1, (lithium salt, manganese salt, nickel salt, cobalt salt): zirconium element (Zr)=1:1.0%.

Embodiment 3

[0048] The difference between the preparation method of lithium battery and Example 1 is that in step S1, (lithium salt, manganese salt, nickel salt, cobalt salt): zirconium element (Zr)=1:3.0%.

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Abstract

The invention discloses a high-temperature-resistant positive electrode material and electrolyte composition, a lithium battery and a preparation method, the high-temperature-resistant positive electrode material comprises an inner core and a shell layer, the inner core comprises a nickel-cobalt-manganese ternary positive electrode material and doping elements, and the shell layer is a solid electrolyte; the ionic conductivity of the electrolyte is larger than or equal to 9.8 mS / cm, and the functional additive in the electrolyte is at least one of TMSPi + VC, HFiP, LiTFSI and VC + LiPF6. The functional additive in the electrolyte and the solid electrolyte jointly form a thicker and stable protective film, so that the cycle performance of the battery cell is greatly improved.

Description

technical field [0001] The invention relates to lithium battery technology, in particular to a high temperature resistant positive electrode material and an electrolyte combination, a lithium battery and a preparation method. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolytes. The performance characteristics of each component will affect the performance of the final battery. At present, nickel-cobalt lithium manganate ternary cathode materials have been widely studied due to their high operating voltage and energy density. However, nickel-based cathode materials are prone to side reactions with electrolytes in high-temperature storage environments (80°C). As a result, the self-discharge of the battery increases; under high temperature cycling (60°C), the structural stability of the positive electrode material is broken, and the electrolyte is continuously consumed to form a new CEI ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0567H01M10/052H01M10/058
CPCH01M4/505H01M4/525H01M4/628H01M10/0567H01M10/052H01M10/058Y02P70/50
Inventor 许晓雄丁超张永龙戈志敏
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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