Pre-lithiation preparation method of lithium ion battery pasting agent and production and application
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A lithium-ion battery and adhesive technology, applied in the field of lithium-ion batteries, can solve problems such as safety hazards, and achieve the effects of increasing cycle life, easy operation, and improving first efficiency.
Inactive Publication Date: 2019-09-06
SHANGHAI NAT ENG RES CENT FORNANOTECH
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Problems solved by technology
Current technologies such as pre-lithiation mainly directly use inert lithium powder, lithium sheets (tapes), etc., but these methods have great potential safety hazards, and actual commercialization has great limitations.
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Embodiment 2
[0029] A lithium-ion battery negative electrode binder is used for silicon-based negative electrode materials, including:
[0033] Mix the silicon-oxygen material with a certain proportion of binder to make lithium polyacrylate [CH 2 CH] n COOLi and conductive agent SP were coated to prepare a button half-cell, which was assembled into a battery and left to stand for 24 h.
[0034] Under the condition that the ambient temperature is 25°C, the charge and discharge test is carried out using the Newwell battery test system, and the first charge and discharge effect is obtained as follows: figure 2 As shown, the first effect is 71.8%, and it can be seen that the first effect has been significantly improved.
Embodiment 3
[0036] A lithium-ion battery negative electrode binder is used for silicon-based negative electrode materials, including:
[0040] Mix the silicon-oxygen material with a certain proportion of binder lithium polyacrylate [CH 2 CH] n COOLi and conductive agent SP were coated to prepare a button half-cell, which was assembled into a battery and left to stand for 24 h.
[0041] Under the condition that the ambient temperature is 25°C, the charge and discharge test is carried out using the Newwell battery test system, and the first charge and discharge effect is obtained as follows: image 3 As shown, the first effect is 73.2%, and it can be seen that the first effect has been significantly improved.
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Abstract
The invention proposes a pre-lithiation preparation method of a lithium ion battery pasting agent and production and application. The pre-lithiation preparation method of the lithium ion battery pasting agent comprises the following steps of introducing lithium ions into a polyacrylic acid binging agent in a lithium ion battery electrode material, wherein the molecule formula of the polyacrylic acid binding agent is [CH2CH]<n>COOH; performing acid base titration on the polyacrylic acid and lithium hydroxide so that pH is equal to 7, wherein the molecule formula of the binging agent is [CH2CH]<n>COOLi; and employing [CH2CH]<n>COOLi to prepare electrode mixed paste to achieve a pre-lithiation effect. The lithium ions are introduced into the polyacrylic acid binding agent in the electrode material, acid base titration is performed on the polyacrylic acid and the lithium hydroxide, the preparation method is simple and efficient and is easy to operate, the initial efficiency of the batteryis effectively improved, and the cycle lifetime of the battery is prolonged.
Description
technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method for pre-lithiation of a lithium ion battery negative electrode binder and its product and application, which are mainly applied to silicon-based negative electrode materials. Background technique [0002] With the improvement of human needs and the needs of development, the energy density of lithium-ion batteries continues to increase. The existing negative electrode material is mainly graphite, and its gram capacity and compaction density have been used to the limit. Therefore, the silicon-based negative electrode material. The use will be a hot spot for the development of lithium-ion batteries. At the same time, the low initial charge and discharge efficiency of silicon-based materials, large expansion, and long-term cycle will cause material pulverization problems, as well as matching problems with related electrolytes and adhesives, which ...
Claims
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