NMC Cathode Production Using Carboxylate Precursors
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Solution Overview
Problem
The current manufacturing cost of NMC materials for lithium ion batteries is high due to the use of conventional hydroxide co-precipitation method, which is complicated and expensive, and also results in the formation of higher oxidation states of manganese that reduce storage capacity.
Innovation Solution
A method for producing NMC cathode materials using carboxylate precursors of nickel, manganese, and cobalt, which are prepared from pure metals or metal compounds, and then reacted to form an oxide material through calcination, thereby controlling the degree of cation mixing and minimizing the presence of higher oxidation states of manganese.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional hydroxide co-precipitation method is used, then NMC materials can be produced, but manufacturing cost is high and process is complicated
Solution Approach 1:
The patent changes the chemical parameters of the precipitation process by using carboxylate precursors (such as acetate or citrate) instead of conventional hydroxide precursors. This parameter change simplifies the manufacturing process and reduces costs while maintaining product quality, directly addressing the contradiction between ease of manufacture and process complexity
Solution Approach 2:
The patent employs inexpensive carboxylate precursors (acetate, citrate) that can be easily sourced and processed, replacing expensive and complex hydroxide co-precipitation reagents. These simple precursors enable a more economical manufacturing approach without requiring complex process equipment or multiple synthesis steps
2Quantity of substance
If conventional hydroxide co-precipitation method is used, then NMC materials can be produced, but higher oxidation states of manganese are formed that reduce storage capacity
Solution Approach 1:
The patent converts the potential harm of manganese oxidation into a benefit by using carboxylate precursors that control the oxidation process. The carboxylate groups act as mild reducing agents during precipitation, preventing excessive oxidation of manganese to higher states (Mn4+), thereby maintaining higher storage capacity while still forming the desired NMC structure
Solution Approach 2:
The carboxylate precursors (acetate, citrate) serve as intermediary compounds that mediate between the metal salts and the final oxide product. During the thermal decomposition and calcination process, these intermediaries control the oxidation environment, preventing direct and excessive oxidation of manganese to harmful higher oxidation states while still enabling formation of the cathode material structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method reduces the production cost of NMC materials, achieves high energy density, and improves the electrochemical performance by controlling cation mixing and preventing the formation of higher manganese oxidation states.
Implementation Method 1
The metal carboxylate precursors are reacted to form an oxide material
Implementation Method 2
calcining to form an oxide
Data Source
AI summary
The present disclosure provides methods for producing cathode materials for lithium ion batteries. Cathode materials that contain manganese are emphasized. Representative materials include LixNi1-y-zMnyCozO2 (NMC) (where x is in the range from 0.80 to 1.3, y is in the range from 0.01 to 0.5, and z is in the range from 0.01 to 0.5), LixMn2O4(LM), and LixNi1-yMnyO2 (LMN) (where x is in the range from 0.8 to 1.3 and y is in the range from 0.0 to 0.8). The process includes reactions of carboxylate precursors of nickel, manganese, and/or cobalt and lithiation with a lithium precursor. The carboxylate precursors are made from reactions of pure metals or metal compounds with carboxylic acids. The manganese precursor contains bivalent manganese and the process controls the oxidation state of manganese to avoid formation of higher oxidation states of manganese.